CVE-2026-74348

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-74348", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-08-15T05:44:03.886Z", "datePublished": "2026-08-15T05:58:35.977Z", "dateUpdated": "2026-11-06T17:05:44.698Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-17T05:17:41.148Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nocfs2/dlm: require a ref for locking_state debugfs open\n\ndebug_lockres_open() copies inode->i_private into struct debug_lockres and\ndebug_lockres_release() later drops that pointer with dlm_put(). That\nonly works if open successfully pins the struct dlm_ctxt.\n\nToday open calls dlm_grab(dlm) but ignores its return value. Once the\nlast domain unregister has removed the context from dlm_domains,\ndlm_grab() returns NULL, yet open still stores the raw pointer and returns\nsuccess. The later release path is outside the debugfs removal barrier,\nso it can call dlm_put() after dlm_free_ctxt_mem() has freed the context. \nKASAN reports this as a slab-use-after-free in dlm_put() called from\ndebug_lockres_release().\n\nFail the open when dlm_grab() cannot acquire the reference and unwind the\nseq_file private state before returning. That keeps locking_state from\nhanding out a file descriptor whose release path does not own the\ndlm_ctxt.\n\nThe buggy scenario involves two paths, with each column showing the order\nwithin that path:\n\nlocking_state debugfs open: last domain unregister:\n1. debug_lockres_open() reads 1. dlm_unregister_domain() calls\n inode->i_private. dlm_complete_dlm_shutdown().\n2. debug_lockres_open() calls 2. shutdown removes the dlm_ctxt from\n dlm_grab(dlm) and gets NULL. dlm_domains.\n3. open still stores the raw dlm 3. final teardown reaches\n pointer in dl->dl_ctxt and dlm_free_ctxt_mem() and frees it.\n returns success.\n4. debug_lockres_release() later\n calls dlm_put(dl->dl_ctxt).\n\nValidation reproduced this kernel report:\nKASAN slab-use-after-free in dlm_put+0x82/0x200\nRIP: 0033:0x7f4d349bc9e0\nThe buggy address belongs to the object at ffff888103a3c000 which belongs\nto the cache kmalloc-2k of size 2048\nThe buggy address is located 816 bytes inside of freed 2048-byte region\n[ffff888103a3c000, ffff888103a3c800)\nWrite of size 4\nCall trace:\n dump_stack_lvl+0x66/0xa0 (?:?)\n print_report+0xd0/0x630 (?:?)\n dlm_put+0x82/0x200 (?:?)\n srso_alias_return_thunk+0x5/0xfbef5 (?:?)\n __virt_addr_valid+0x188/0x2f0 (?:?)\n kasan_report+0xe4/0x120 (?:?)\n kasan_check_range+0x105/0x1b0 (?:?)\n debug_lockres_release+0x53/0x80 (fs/ocfs2/dlm/dlmdebug.c:587)\n dlm_put+0x9/0x200 (?:?)\n debug_lockres_release+0x5c/0x80 (fs/ocfs2/dlm/dlmdebug.c:587)\n full_proxy_release+0x67/0x90 (?:?)\n __fput+0x1df/0x4b0 (?:?)\n do_raw_spin_lock+0x10f/0x1b0 (?:?)\n fput_close_sync+0xd2/0x170 (?:?)\n __x64_sys_close+0x55/0x90 (?:?)\n do_syscall_64+0x10c/0x640 (arch/x86/entry/syscall_64.c:87)\n irqentry_exit+0xac/0x6e0 (?:?)\n entry_SYSCALL_64_after_hwframe+0x77/0x7f (?:?)\nFreed by task stack:\n kasan_save_stack+0x33/0x60 (?:?)\n kasan_save_track+0x14/0x30 (?:?)\n kasan_save_free_info+0x3b/0x60 (?:?)\n __kasan_slab_free+0x5f/0x80 (?:?)\n kfree+0x30f/0x580 (?:?)\n dlm_put+0x1ce/0x200 (?:?)\n dlm_unregister_domain+0xf6/0xb30 (?:?)\n o2cb_cluster_disconnect+0x6b/0x90 (?:?)\n ocfs2_cluster_disconnect+0x41/0x70 (?:?)\n ocfs2_dlm_shutdown+0x1c4/0x220 (?:?)\n ocfs2_dismount_volume+0x38a/0x550 (?:?)\n generic_shutdown_super+0xc3/0x220 (?:?)\n kill_block_super+0x29/0x60 (?:?)\n deactivate_locked_super+0x66/0xe0 (?:?)\n cleanup_mnt+0x13d/0x210 (?:?)\n task_work_run+0xfa/0x170 (?:?)\n exit_to_user_mode_loop+0xd6/0x430 (?:?)\n do_syscall_64+0x3cb/0x640 (arch/x86/entry/syscall_64.c:87)\n entry_SYSCALL_64_after_hwframe+0x77/0x7f (?:?)"}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["fs/ocfs2/dlm/dlmdebug.c"], "versions": [{"version": "4e3d24ed1a1285fe3289653aacc965642706bacb", "lessThan": "6cc93dea4078cbcddee63fa2234e382a76600464", "status": "affected", "versionType": "git"}, {"version": "4e3d24ed1a1285fe3289653aacc965642706bacb", "lessThan": "90a6512425414098a63fc97b77bed089c75d106b", "status": "affected", "versionType": "git"}, {"version": "4e3d24ed1a1285fe3289653aacc965642706bacb", "lessThan": "5bee5d5f67aedd26d2b72e00e49dd93331fbcc30", "status": "affected", "versionType": "git"}, {"version": "4e3d24ed1a1285fe3289653aacc965642706bacb", "lessThan": "aa7883b6a3c76301a3299deb34de948e73bb6a08", "status": "affected", "versionType": "git"}, {"version": "4e3d24ed1a1285fe3289653aacc965642706bacb", "lessThan": "9c81c1a61a52b6ecf0d14f1dbd95f154a7a9e92a", "status": "affected", "versionType": "git"}, {"version": "4e3d24ed1a1285fe3289653aacc965642706bacb", "lessThan": "a087b2d3411e7f9df71ba3293596923ee2c70d65", "status": "affected", "versionType": "git"}, {"version": "4e3d24ed1a1285fe3289653aacc965642706bacb", "lessThan": "a09831214912a1f270663d935613910fafd8d883", "status": "affected", "versionType": "git"}, {"version": "4e3d24ed1a1285fe3289653aacc965642706bacb", "lessThan": "03ad858ce8064861ea580021976dc19b7aabb549", "status": "affected", "versionType": "git"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["fs/ocfs2/dlm/dlmdebug.c"], "versions": [{"version": "2.6.26", "status": "affected"}, {"version": "0", "lessThan": "2.6.26", "status": "unaffected", "versionType": "semver"}, {"version": "5.10.261", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver"}, {"version": "5.15.212", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.1.178", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.6.145", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.97", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.40", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.1.5", "lessThanOrEqual": "7.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.2", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix"}]}], "cpeApplicability": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.26", "versionEndExcluding": "5.10.261"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.26", "versionEndExcluding": "5.15.212"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.26", "versionEndExcluding": "6.1.178"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.26", "versionEndExcluding": "6.6.145"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.26", "versionEndExcluding": "6.12.97"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.26", "versionEndExcluding": "6.18.40"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.26", "versionEndExcluding": "7.1.5"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.26", "versionEndExcluding": "7.2"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/6cc93dea4078cbcddee63fa2234e382a76600464"}, {"url": "https://git.kernel.org/stable/c/90a6512425414098a63fc97b77bed089c75d106b"}, {"url": "https://git.kernel.org/stable/c/5bee5d5f67aedd26d2b72e00e49dd93331fbcc30"}, {"url": "https://git.kernel.org/stable/c/aa7883b6a3c76301a3299deb34de948e73bb6a08"}, {"url": "https://git.kernel.org/stable/c/9c81c1a61a52b6ecf0d14f1dbd95f154a7a9e92a"}, {"url": "https://git.kernel.org/stable/c/a087b2d3411e7f9df71ba3293596923ee2c70d65"}, {"url": "https://git.kernel.org/stable/c/a09831214912a1f270663d935613910fafd8d883"}, {"url": "https://git.kernel.org/stable/c/03ad858ce8064861ea580021976dc19b7aabb549"}], "title": "ocfs2/dlm: require a ref for locking_state debugfs open", "x_generator": {"engine": "bippy-1.2.0"}}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2026-74348", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "partial"}], "version": "2.0.3", "timestamp": "2026-11-06T16:56:27.430256Z"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-11-06T17:05:44.698Z"}}]}}

{"dataType": "CVE_RECORD", "containers": {"adp": [{"title": "CISA ADP Vulnrichment", "metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2026-74348", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "partial"}], "version": "2.0.3", "timestamp": "2026-11-06T16:56:27.430256Z"}}}], "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-11-06T16:56:28.495Z"}}], "cna": {"title": "ocfs2/dlm: require a ref for locking_state debugfs open", "affected": [{"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "4e3d24ed1a1285fe3289653aacc965642706bacb", "lessThan": "6cc93dea4078cbcddee63fa2234e382a76600464", "versionType": "git"}, {"status": "affected", "version": "4e3d24ed1a1285fe3289653aacc965642706bacb", "lessThan": "90a6512425414098a63fc97b77bed089c75d106b", "versionType": "git"}, {"status": "affected", "version": "4e3d24ed1a1285fe3289653aacc965642706bacb", "lessThan": "5bee5d5f67aedd26d2b72e00e49dd93331fbcc30", "versionType": "git"}, {"status": "affected", "version": "4e3d24ed1a1285fe3289653aacc965642706bacb", "lessThan": "aa7883b6a3c76301a3299deb34de948e73bb6a08", "versionType": "git"}, {"status": "affected", "version": "4e3d24ed1a1285fe3289653aacc965642706bacb", "lessThan": "9c81c1a61a52b6ecf0d14f1dbd95f154a7a9e92a", "versionType": "git"}, {"status": "affected", "version": "4e3d24ed1a1285fe3289653aacc965642706bacb", "lessThan": "a087b2d3411e7f9df71ba3293596923ee2c70d65", "versionType": "git"}, {"status": "affected", "version": "4e3d24ed1a1285fe3289653aacc965642706bacb", "lessThan": "a09831214912a1f270663d935613910fafd8d883", "versionType": "git"}, {"status": "affected", "version": "4e3d24ed1a1285fe3289653aacc965642706bacb", "lessThan": "03ad858ce8064861ea580021976dc19b7aabb549", "versionType": "git"}], "programFiles": ["fs/ocfs2/dlm/dlmdebug.c"], "defaultStatus": "unaffected"}, {"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "2.6.26"}, {"status": "unaffected", "version": "0", "lessThan": "2.6.26", "versionType": "semver"}, {"status": "unaffected", "version": "5.10.261", "versionType": "semver", "lessThanOrEqual": "5.10.*"}, {"status": "unaffected", "version": "5.15.212", "versionType": "semver", "lessThanOrEqual": "5.15.*"}, {"status": "unaffected", "version": "6.1.178", "versionType": "semver", "lessThanOrEqual": "6.1.*"}, {"status": "unaffected", "version": "6.6.145", "versionType": "semver", "lessThanOrEqual": "6.6.*"}, {"status": "unaffected", "version": "6.12.97", "versionType": "semver", "lessThanOrEqual": "6.12.*"}, {"status": "unaffected", "version": "6.18.40", "versionType": "semver", "lessThanOrEqual": "6.18.*"}, {"status": "unaffected", "version": "7.1.5", "versionType": "semver", "lessThanOrEqual": "7.1.*"}, {"status": "unaffected", "version": "7.2", "versionType": "original_commit_for_fix", "lessThanOrEqual": "*"}], "programFiles": ["fs/ocfs2/dlm/dlmdebug.c"], "defaultStatus": "affected"}], "references": [{"url": "https://git.kernel.org/stable/c/6cc93dea4078cbcddee63fa2234e382a76600464"}, {"url": "https://git.kernel.org/stable/c/90a6512425414098a63fc97b77bed089c75d106b"}, {"url": "https://git.kernel.org/stable/c/5bee5d5f67aedd26d2b72e00e49dd93331fbcc30"}, {"url": "https://git.kernel.org/stable/c/aa7883b6a3c76301a3299deb34de948e73bb6a08"}, {"url": "https://git.kernel.org/stable/c/9c81c1a61a52b6ecf0d14f1dbd95f154a7a9e92a"}, {"url": "https://git.kernel.org/stable/c/a087b2d3411e7f9df71ba3293596923ee2c70d65"}, {"url": "https://git.kernel.org/stable/c/a09831214912a1f270663d935613910fafd8d883"}, {"url": "https://git.kernel.org/stable/c/03ad858ce8064861ea580021976dc19b7aabb549"}], "x_generator": {"engine": "bippy-1.2.0"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nocfs2/dlm: require a ref for locking_state debugfs open\n\ndebug_lockres_open() copies inode->i_private into struct debug_lockres and\ndebug_lockres_release() later drops that pointer with dlm_put(). That\nonly works if open successfully pins the struct dlm_ctxt.\n\nToday open calls dlm_grab(dlm) but ignores its return value. Once the\nlast domain unregister has removed the context from dlm_domains,\ndlm_grab() returns NULL, yet open still stores the raw pointer and returns\nsuccess. The later release path is outside the debugfs removal barrier,\nso it can call dlm_put() after dlm_free_ctxt_mem() has freed the context. \nKASAN reports this as a slab-use-after-free in dlm_put() called from\ndebug_lockres_release().\n\nFail the open when dlm_grab() cannot acquire the reference and unwind the\nseq_file private state before returning. That keeps locking_state from\nhanding out a file descriptor whose release path does not own the\ndlm_ctxt.\n\nThe buggy scenario involves two paths, with each column showing the order\nwithin that path:\n\nlocking_state debugfs open: last domain unregister:\n1. debug_lockres_open() reads 1. dlm_unregister_domain() calls\n inode->i_private. dlm_complete_dlm_shutdown().\n2. debug_lockres_open() calls 2. shutdown removes the dlm_ctxt from\n dlm_grab(dlm) and gets NULL. dlm_domains.\n3. open still stores the raw dlm 3. final teardown reaches\n pointer in dl->dl_ctxt and dlm_free_ctxt_mem() and frees it.\n returns success.\n4. debug_lockres_release() later\n calls dlm_put(dl->dl_ctxt).\n\nValidation reproduced this kernel report:\nKASAN slab-use-after-free in dlm_put+0x82/0x200\nRIP: 0033:0x7f4d349bc9e0\nThe buggy address belongs to the object at ffff888103a3c000 which belongs\nto the cache kmalloc-2k of size 2048\nThe buggy address is located 816 bytes inside of freed 2048-byte region\n[ffff888103a3c000, ffff888103a3c800)\nWrite of size 4\nCall trace:\n dump_stack_lvl+0x66/0xa0 (?:?)\n print_report+0xd0/0x630 (?:?)\n dlm_put+0x82/0x200 (?:?)\n srso_alias_return_thunk+0x5/0xfbef5 (?:?)\n __virt_addr_valid+0x188/0x2f0 (?:?)\n kasan_report+0xe4/0x120 (?:?)\n kasan_check_range+0x105/0x1b0 (?:?)\n debug_lockres_release+0x53/0x80 (fs/ocfs2/dlm/dlmdebug.c:587)\n dlm_put+0x9/0x200 (?:?)\n debug_lockres_release+0x5c/0x80 (fs/ocfs2/dlm/dlmdebug.c:587)\n full_proxy_release+0x67/0x90 (?:?)\n __fput+0x1df/0x4b0 (?:?)\n do_raw_spin_lock+0x10f/0x1b0 (?:?)\n fput_close_sync+0xd2/0x170 (?:?)\n __x64_sys_close+0x55/0x90 (?:?)\n do_syscall_64+0x10c/0x640 (arch/x86/entry/syscall_64.c:87)\n irqentry_exit+0xac/0x6e0 (?:?)\n entry_SYSCALL_64_after_hwframe+0x77/0x7f (?:?)\nFreed by task stack:\n kasan_save_stack+0x33/0x60 (?:?)\n kasan_save_track+0x14/0x30 (?:?)\n kasan_save_free_info+0x3b/0x60 (?:?)\n __kasan_slab_free+0x5f/0x80 (?:?)\n kfree+0x30f/0x580 (?:?)\n dlm_put+0x1ce/0x200 (?:?)\n dlm_unregister_domain+0xf6/0xb30 (?:?)\n o2cb_cluster_disconnect+0x6b/0x90 (?:?)\n ocfs2_cluster_disconnect+0x41/0x70 (?:?)\n ocfs2_dlm_shutdown+0x1c4/0x220 (?:?)\n ocfs2_dismount_volume+0x38a/0x550 (?:?)\n generic_shutdown_super+0xc3/0x220 (?:?)\n kill_block_super+0x29/0x60 (?:?)\n deactivate_locked_super+0x66/0xe0 (?:?)\n cleanup_mnt+0x13d/0x210 (?:?)\n task_work_run+0xfa/0x170 (?:?)\n exit_to_user_mode_loop+0xd6/0x430 (?:?)\n do_syscall_64+0x3cb/0x640 (arch/x86/entry/syscall_64.c:87)\n entry_SYSCALL_64_after_hwframe+0x77/0x7f (?:?)"}], "cpeApplicability": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "5.10.261", "versionStartIncluding": "2.6.26"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "5.15.212", "versionStartIncluding": "2.6.26"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.1.178", "versionStartIncluding": "2.6.26"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.6.145", "versionStartIncluding": "2.6.26"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.12.97", "versionStartIncluding": "2.6.26"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.18.40", "versionStartIncluding": "2.6.26"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "7.1.5", "versionStartIncluding": "2.6.26"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "7.2", "versionStartIncluding": "2.6.26"}], "operator": "OR"}]}], "providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-17T05:17:41.148Z"}}}, "cveMetadata": {"cveId": "CVE-2026-74348", "state": "PUBLISHED", "dateUpdated": "2026-11-06T17:05:44.698Z", "dateReserved": "2026-08-15T05:44:03.886Z", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "datePublished": "2026-08-15T05:58:35.977Z", "assignerShortName": "Linux"}, "dataVersion": "5.2"}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["fs/ocfs2/dlm/dlmdebug.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "6cc93dea4078cbcddee63fa2234e382a76600464", "status": "affected", "version": "4e3d24ed1a1285fe3289653aacc965642706bacb", "versionType": "git"}, {"lessThan": "90a6512425414098a63fc97b77bed089c75d106b", "status": "affected", "version": "4e3d24ed1a1285fe3289653aacc965642706bacb", "versionType": "git"}, {"lessThan": "5bee5d5f67aedd26d2b72e00e49dd93331fbcc30", "status": "affected", "version": "4e3d24ed1a1285fe3289653aacc965642706bacb", "versionType": "git"}, {"lessThan": "aa7883b6a3c76301a3299deb34de948e73bb6a08", "status": "affected", "version": "4e3d24ed1a1285fe3289653aacc965642706bacb", "versionType": "git"}, {"lessThan": "9c81c1a61a52b6ecf0d14f1dbd95f154a7a9e92a", "status": "affected", "version": "4e3d24ed1a1285fe3289653aacc965642706bacb", "versionType": "git"}, {"lessThan": "a087b2d3411e7f9df71ba3293596923ee2c70d65", "status": "affected", "version": "4e3d24ed1a1285fe3289653aacc965642706bacb", "versionType": "git"}, {"lessThan": "a09831214912a1f270663d935613910fafd8d883", "status": "affected", "version": "4e3d24ed1a1285fe3289653aacc965642706bacb", "versionType": "git"}, {"lessThan": "03ad858ce8064861ea580021976dc19b7aabb549", "status": "affected", "version": "4e3d24ed1a1285fe3289653aacc965642706bacb", "versionType": "git"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["fs/ocfs2/dlm/dlmdebug.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "2.6.26"}, {"lessThan": "2.6.26", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "5.10.*", "status": "unaffected", "version": "5.10.261", "versionType": "semver"}, {"lessThanOrEqual": "5.15.*", "status": "unaffected", "version": "5.15.212", "versionType": "semver"}, {"lessThanOrEqual": "6.1.*", "status": "unaffected", "version": "6.1.178", "versionType": "semver"}, {"lessThanOrEqual": "6.6.*", "status": "unaffected", "version": "6.6.145", "versionType": "semver"}, {"lessThanOrEqual": "6.12.*", "status": "unaffected", "version": "6.12.97", "versionType": "semver"}, {"lessThanOrEqual": "6.18.*", "status": "unaffected", "version": "6.18.40", "versionType": "semver"}, {"lessThanOrEqual": "7.1.*", "status": "unaffected", "version": "7.1.5", "versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "7.2", "versionType": "original_commit_for_fix"}]}], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nocfs2/dlm: require a ref for locking_state debugfs open\n\ndebug_lockres_open() copies inode->i_private into struct debug_lockres and\ndebug_lockres_release() later drops that pointer with dlm_put(). That\nonly works if open successfully pins the struct dlm_ctxt.\n\nToday open calls dlm_grab(dlm) but ignores its return value. Once the\nlast domain unregister has removed the context from dlm_domains,\ndlm_grab() returns NULL, yet open still stores the raw pointer and returns\nsuccess. The later release path is outside the debugfs removal barrier,\nso it can call dlm_put() after dlm_free_ctxt_mem() has freed the context. \nKASAN reports this as a slab-use-after-free in dlm_put() called from\ndebug_lockres_release().\n\nFail the open when dlm_grab() cannot acquire the reference and unwind the\nseq_file private state before returning. That keeps locking_state from\nhanding out a file descriptor whose release path does not own the\ndlm_ctxt.\n\nThe buggy scenario involves two paths, with each column showing the order\nwithin that path:\n\nlocking_state debugfs open: last domain unregister:\n1. debug_lockres_open() reads 1. dlm_unregister_domain() calls\n inode->i_private. dlm_complete_dlm_shutdown().\n2. debug_lockres_open() calls 2. shutdown removes the dlm_ctxt from\n dlm_grab(dlm) and gets NULL. dlm_domains.\n3. open still stores the raw dlm 3. final teardown reaches\n pointer in dl->dl_ctxt and dlm_free_ctxt_mem() and frees it.\n returns success.\n4. debug_lockres_release() later\n calls dlm_put(dl->dl_ctxt).\n\nValidation reproduced this kernel report:\nKASAN slab-use-after-free in dlm_put+0x82/0x200\nRIP: 0033:0x7f4d349bc9e0\nThe buggy address belongs to the object at ffff888103a3c000 which belongs\nto the cache kmalloc-2k of size 2048\nThe buggy address is located 816 bytes inside of freed 2048-byte region\n[ffff888103a3c000, ffff888103a3c800)\nWrite of size 4\nCall trace:\n dump_stack_lvl+0x66/0xa0 (?:?)\n print_report+0xd0/0x630 (?:?)\n dlm_put+0x82/0x200 (?:?)\n srso_alias_return_thunk+0x5/0xfbef5 (?:?)\n __virt_addr_valid+0x188/0x2f0 (?:?)\n kasan_report+0xe4/0x120 (?:?)\n kasan_check_range+0x105/0x1b0 (?:?)\n debug_lockres_release+0x53/0x80 (fs/ocfs2/dlm/dlmdebug.c:587)\n dlm_put+0x9/0x200 (?:?)\n debug_lockres_release+0x5c/0x80 (fs/ocfs2/dlm/dlmdebug.c:587)\n full_proxy_release+0x67/0x90 (?:?)\n __fput+0x1df/0x4b0 (?:?)\n do_raw_spin_lock+0x10f/0x1b0 (?:?)\n fput_close_sync+0xd2/0x170 (?:?)\n __x64_sys_close+0x55/0x90 (?:?)\n do_syscall_64+0x10c/0x640 (arch/x86/entry/syscall_64.c:87)\n irqentry_exit+0xac/0x6e0 (?:?)\n entry_SYSCALL_64_after_hwframe+0x77/0x7f (?:?)\nFreed by task stack:\n kasan_save_stack+0x33/0x60 (?:?)\n kasan_save_track+0x14/0x30 (?:?)\n kasan_save_free_info+0x3b/0x60 (?:?)\n __kasan_slab_free+0x5f/0x80 (?:?)\n kfree+0x30f/0x580 (?:?)\n dlm_put+0x1ce/0x200 (?:?)\n dlm_unregister_domain+0xf6/0xb30 (?:?)\n o2cb_cluster_disconnect+0x6b/0x90 (?:?)\n ocfs2_cluster_disconnect+0x41/0x70 (?:?)\n ocfs2_dlm_shutdown+0x1c4/0x220 (?:?)\n ocfs2_dismount_volume+0x38a/0x550 (?:?)\n generic_shutdown_super+0xc3/0x220 (?:?)\n kill_block_super+0x29/0x60 (?:?)\n deactivate_locked_super+0x66/0xe0 (?:?)\n cleanup_mnt+0x13d/0x210 (?:?)\n task_work_run+0xfa/0x170 (?:?)\n exit_to_user_mode_loop+0xd6/0x430 (?:?)\n do_syscall_64+0x3cb/0x640 (arch/x86/entry/syscall_64.c:87)\n entry_SYSCALL_64_after_hwframe+0x77/0x7f (?:?)"}], "id": "CVE-2026-74348", "lastModified": "2026-11-06T17:19:46.800", "metrics": {"ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-74348", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-11-06T16:56:27.430256Z", "version": "2.0.3"}}]}, "published": "2026-08-15T06:22:35.970", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/03ad858ce8064861ea580021976dc19b7aabb549"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/5bee5d5f67aedd26d2b72e00e49dd93331fbcc30"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/6cc93dea4078cbcddee63fa2234e382a76600464"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/90a6512425414098a63fc97b77bed089c75d106b"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/9c81c1a61a52b6ecf0d14f1dbd95f154a7a9e92a"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/a087b2d3411e7f9df71ba3293596923ee2c70d65"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/a09831214912a1f270663d935613910fafd8d883"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/aa7883b6a3c76301a3299deb34de948e73bb6a08"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Received"}

{"bugzilla": {"description": "kernel: ocfs2/dlm: require a ref for locking_state debugfs open", "id": "2516802", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2516802"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.5", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-825", "details": ["In the Linux kernel, the following vulnerability has been resolved:\nocfs2/dlm: require a ref for locking_state debugfs open\ndebug_lockres_open() copies inode->i_private into struct debug_lockres and\ndebug_lockres_release() later drops that pointer with dlm_put(). That\nonly works if open successfully pins the struct dlm_ctxt.\nToday open calls dlm_grab(dlm) but ignores its return value. Once the\nlast domain unregister has removed the context from dlm_domains,\ndlm_grab() returns NULL, yet open still stores the raw pointer and returns\nsuccess. The later release path is outside the debugfs removal barrier,\nso it can call dlm_put() after dlm_free_ctxt_mem() has freed the context. \nKASAN reports this as a slab-use-after-free in dlm_put() called from\ndebug_lockres_release().\nFail the open when dlm_grab() cannot acquire the reference and unwind the\nseq_file private state before returning. That keeps locking_state from\nhanding out a file descriptor whose release path does not own the\ndlm_ctxt.\nThe buggy scenario involves two paths, with each column showing the order\nwithin that path:\nlocking_state debugfs open: last domain unregister:\n1. debug_lockres_open() reads 1. dlm_unregister_domain() calls\ninode->i_private. dlm_complete_dlm_shutdown().\n2. debug_lockres_open() calls 2. shutdown removes the dlm_ctxt from\ndlm_grab(dlm) and gets NULL. dlm_domains.\n3. open still stores the raw dlm 3. final teardown reaches\npointer in dl->dl_ctxt and dlm_free_ctxt_mem() and frees it.\nreturns success.\n4. debug_lockres_release() later\ncalls dlm_put(dl->dl_ctxt).\nValidation reproduced this kernel report:\nKASAN slab-use-after-free in dlm_put+0x82/0x200\nRIP: 0033:0x7f4d349bc9e0\nThe buggy address belongs to the object at ffff888103a3c000 which belongs\nto the cache kmalloc-2k of size 2048\nThe buggy address is located 816 bytes inside of freed 2048-byte region\n[ffff888103a3c000, ffff888103a3c800)\nWrite of size 4\nCall trace:\ndump_stack_lvl+0x66/0xa0 (?:?)\nprint_report+0xd0/0x630 (?:?)\ndlm_put+0x82/0x200 (?:?)\nsrso_alias_return_thunk+0x5/0xfbef5 (?:?)\n__virt_addr_valid+0x188/0x2f0 (?:?)\nkasan_report+0xe4/0x120 (?:?)\nkasan_check_range+0x105/0x1b0 (?:?)\ndebug_lockres_release+0x53/0x80 (fs/ocfs2/dlm/dlmdebug.c:587)\ndlm_put+0x9/0x200 (?:?)\ndebug_lockres_release+0x5c/0x80 (fs/ocfs2/dlm/dlmdebug.c:587)\nfull_proxy_release+0x67/0x90 (?:?)\n__fput+0x1df/0x4b0 (?:?)\ndo_raw_spin_lock+0x10f/0x1b0 (?:?)\nfput_close_sync+0xd2/0x170 (?:?)\n__x64_sys_close+0x55/0x90 (?:?)\ndo_syscall_64+0x10c/0x640 (arch/x86/entry/syscall_64.c:87)\nirqentry_exit+0xac/0x6e0 (?:?)\nentry_SYSCALL_64_after_hwframe+0x77/0x7f (?:?)\nFreed by task stack:\nkasan_save_stack+0x33/0x60 (?:?)\nkasan_save_track+0x14/0x30 (?:?)\nkasan_save_free_info+0x3b/0x60 (?:?)\n__kasan_slab_free+0x5f/0x80 (?:?)\nkfree+0x30f/0x580 (?:?)\ndlm_put+0x1ce/0x200 (?:?)\ndlm_unregister_domain+0xf6/0xb30 (?:?)\no2cb_cluster_disconnect+0x6b/0x90 (?:?)\nocfs2_cluster_disconnect+0x41/0x70 (?:?)\nocfs2_dlm_shutdown+0x1c4/0x220 (?:?)\nocfs2_dismount_volume+0x38a/0x550 (?:?)\ngeneric_shutdown_super+0xc3/0x220 (?:?)\nkill_block_super+0x29/0x60 (?:?)\ndeactivate_locked_super+0x66/0xe0 (?:?)\ncleanup_mnt+0x13d/0x210 (?:?)\ntask_work_run+0xfa/0x170 (?:?)\nexit_to_user_mode_loop+0xd6/0x430 (?:?)\ndo_syscall_64+0x3cb/0x640 (arch/x86/entry/syscall_64.c:87)\nentry_SYSCALL_64_after_hwframe+0x77/0x7f (?:?)", "A flaw was found in the Linux kernel's OCFS2 Distributed Lock Manager (DLM). A local user could exploit a use-after-free vulnerability in the `locking_state` debugfs interface. This occurs because the `debug_lockres_open()` function does not correctly handle cases where a reference to a DLM context cannot be acquired, allowing a freed memory region to be accessed later. This flaw can lead to a system crash (Denial of Service) or potentially enable a local attacker to achieve arbitrary code execution."], "name": "CVE-2026-74348", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2026-08-15T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-74348\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-74348\nhttps://lore.kernel.org/linux-cve-announce/2026081559-CVE-2026-74348-3c99@gregkh/T"], "threat_severity": "Moderate"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[4e3d24ed1a1285fe3289653aacc965642706bacb,6cc93dea4078cbcddee63fa2234e382a76600464)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[4e3d24ed1a1285fe3289653aacc965642706bacb,90a6512425414098a63fc97b77bed089c75d106b)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[4e3d24ed1a1285fe3289653aacc965642706bacb,5bee5d5f67aedd26d2b72e00e49dd93331fbcc30)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[4e3d24ed1a1285fe3289653aacc965642706bacb,aa7883b6a3c76301a3299deb34de948e73bb6a08)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[4e3d24ed1a1285fe3289653aacc965642706bacb,9c81c1a61a52b6ecf0d14f1dbd95f154a7a9e92a)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[4e3d24ed1a1285fe3289653aacc965642706bacb,a087b2d3411e7f9df71ba3293596923ee2c70d65)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[4e3d24ed1a1285fe3289653aacc965642706bacb,a09831214912a1f270663d935613910fafd8d883)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[4e3d24ed1a1285fe3289653aacc965642706bacb,03ad858ce8064861ea580021976dc19b7aabb549)"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}, {"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[4e3d24ed1a1285fe3289653aacc965642706bacb,6cc93dea4078cbcddee63fa2234e382a76600464)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[4e3d24ed1a1285fe3289653aacc965642706bacb,90a6512425414098a63fc97b77bed089c75d106b)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[4e3d24ed1a1285fe3289653aacc965642706bacb,5bee5d5f67aedd26d2b72e00e49dd93331fbcc30)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[4e3d24ed1a1285fe3289653aacc965642706bacb,aa7883b6a3c76301a3299deb34de948e73bb6a08)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[4e3d24ed1a1285fe3289653aacc965642706bacb,9c81c1a61a52b6ecf0d14f1dbd95f154a7a9e92a)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[4e3d24ed1a1285fe3289653aacc965642706bacb,a087b2d3411e7f9df71ba3293596923ee2c70d65)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[4e3d24ed1a1285fe3289653aacc965642706bacb,a09831214912a1f270663d935613910fafd8d883)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[4e3d24ed1a1285fe3289653aacc965642706bacb,03ad858ce8064861ea580021976dc19b7aabb549)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "2.6.26"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[0,2.6.26)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[5.10.261,5.11.0]"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[5.15.212,5.16.0]"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.1.178,6.2.0]"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.6.145,6.7.0]"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.12.97,6.13.0]"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.18.40,6.19.0]"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[7.1.5,7.2.0]"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[7.2-rc1,*]"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}], "created": "2026-08-15T16:30:03.973285+00:00", "updated": "2026-08-22T00:00:16.120713+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"], "weaknesses": ["CWE-416", "CWE-825"]}