CVE-2025-39866

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2025-39866", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2025-04-16T07:20:57.143Z", "datePublished": "2025-09-19T15:26:35.725Z", "dateUpdated": "2026-11-10T12:37:12.814Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T12:05:45.584Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nfs: writeback: fix use-after-free in __mark_inode_dirty()\n\nAn use-after-free issue occurred when __mark_inode_dirty() get the\nbdi_writeback that was in the progress of switching.\n\nCPU: 1 PID: 562 Comm: systemd-random- Not tainted 6.6.56-gb4403bd46a8e #1\n......\npstate: 60400005 (nZCv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--)\npc : __mark_inode_dirty+0x124/0x418\nlr : __mark_inode_dirty+0x118/0x418\nsp : ffffffc08c9dbbc0\n........\nCall trace:\n __mark_inode_dirty+0x124/0x418\n generic_update_time+0x4c/0x60\n file_modified+0xcc/0xd0\n ext4_buffered_write_iter+0x58/0x124\n ext4_file_write_iter+0x54/0x704\n vfs_write+0x1c0/0x308\n ksys_write+0x74/0x10c\n __arm64_sys_write+0x1c/0x28\n invoke_syscall+0x48/0x114\n el0_svc_common.constprop.0+0xc0/0xe0\n do_el0_svc+0x1c/0x28\n el0_svc+0x40/0xe4\n el0t_64_sync_handler+0x120/0x12c\n el0t_64_sync+0x194/0x198\n\nRoot cause is:\n\nsystemd-random-seed kworker\n----------------------------------------------------------------------\n___mark_inode_dirty inode_switch_wbs_work_fn\n\n spin_lock(&inode->i_lock);\n inode_attach_wb\n locked_inode_to_wb_and_lock_list\n get inode->i_wb\n spin_unlock(&inode->i_lock);\n spin_lock(&wb->list_lock)\n spin_lock(&inode->i_lock)\n inode_io_list_move_locked\n spin_unlock(&wb->list_lock)\n spin_unlock(&inode->i_lock)\n spin_lock(&old_wb->list_lock)\n inode_do_switch_wbs\n spin_lock(&inode->i_lock)\n inode->i_wb = new_wb\n spin_unlock(&inode->i_lock)\n spin_unlock(&old_wb->list_lock)\n wb_put_many(old_wb, nr_switched)\n cgwb_release\n old wb released\n wb_wakeup_delayed() accesses wb,\n then trigger the use-after-free\n issue\n\nFix this race condition by holding inode spinlock until\nwb_wakeup_delayed() finished."}], "metrics": [{"cvssV3_1": {"version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "baseScore": 7.8, "baseSeverity": "HIGH"}, "scenarios": [{"lang": "en", "value": "AV:L - The vulnerable code is reached from an ordinary write(2) syscall (vfs_write \u2192 ext4_buffered_write_iter \u2192 file_modified \u2192 generic_update_time \u2192 __mark_inode_dirty), and the competing side requires local cgroup/writeback activity. No network protocol handler is involved.\nAC:L - The attacker drives both sides of the race \u2014 a multi-threaded write() loop dirties the inode while the attacker forces cgroup writeback switches by dirtying the file from a second memcg and tearing that cgroup down, making the old wb's last reference drop. Attempts are unlimited and the bug was observed occurring spontaneously during normal boot, and CONFIG_CGROUP_WRITEBACK is default-y on all mainstream kernels.\nPR:L - Only an unprivileged local account with write access to a file on a writeback-capable filesystem (ext4/xfs home or /tmp) is needed; cgroup manipulation used to widen the race is available to ordinary users through systemd's delegated per-user cgroup subtree.\nUI:N - The attacker triggers everything itself through its own write() syscalls and cgroup activity; no victim action or interaction is required.\nS:U - The use-after-free corrupts kernel heap memory within the same kernel security authority; there is no VM, IOMMU, or sandbox boundary crossed.\nC:H - The freed bdi_writeback is dereferenced as `wb->bdi->capabilities`, so a re-sprayed object yields an attacker-controlled pointer dereference and an arbitrary kernel-memory read primitive, enabling disclosure of arbitrary kernel data.\nI:H - wb_wakeup_delayed() writes into the freed object (spin_lock_irq on wb->work_lock) and inserts the freed `wb->dwork` timer into the timer wheel, giving list-write primitives and an attacker-controlled `timer->function` \u2014 a direct control-flow hijack path to arbitrary kernel code execution.\nA:H - The use-after-free reliably produces a kernel oops/panic as reported in the original crash trace (__mark_inode_dirty+0x124), and can be triggered repeatedly to crash the system."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["fs/fs-writeback.c"], "versions": [{"version": "0747259d13febfcc838980a63c414c9b920cea6f", "lessThan": "e2a14bbae5d8bacaa301362744a110e2be40a3a3", "status": "affected", "versionType": "git"}, {"version": "0747259d13febfcc838980a63c414c9b920cea6f", "lessThan": "b187c976111960e6e54a6b1fff724f6e3d39406c", "status": "affected", "versionType": "git"}, {"version": "0747259d13febfcc838980a63c414c9b920cea6f", "lessThan": "1edc2feb9c759a9883dfe81cb5ed231412d8b2e4", "status": "affected", "versionType": "git"}, {"version": "0747259d13febfcc838980a63c414c9b920cea6f", "lessThan": "bf89b1f87c72df79cf76203f71fbf8349cd5c9de", "status": "affected", "versionType": "git"}, {"version": "0747259d13febfcc838980a63c414c9b920cea6f", "lessThan": "e63052921f1b25a836feb1500b841bff7a4a0456", "status": "affected", "versionType": "git"}, {"version": "0747259d13febfcc838980a63c414c9b920cea6f", "lessThan": "c8c14adf80bd1a6e4a1d7ee9c2a816881c26d17a", "status": "affected", "versionType": "git"}, {"version": "0747259d13febfcc838980a63c414c9b920cea6f", "lessThan": "d02d2c98d25793902f65803ab853b592c7a96b29", "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/fs-writeback.c"], "versions": [{"version": "4.2", "status": "affected"}, {"version": "0", "lessThan": "4.2", "status": "unaffected", "versionType": "semver"}, {"version": "5.10.247", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver"}, {"version": "5.15.192", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.1.151", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.6.105", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.46", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.16.6", "lessThanOrEqual": "6.16.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.17", "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:*:*:*:*:*:*:*:*", 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"https://git.kernel.org/stable/c/e2a14bbae5d8bacaa301362744a110e2be40a3a3"}, {"url": "https://git.kernel.org/stable/c/b187c976111960e6e54a6b1fff724f6e3d39406c"}, {"url": "https://git.kernel.org/stable/c/1edc2feb9c759a9883dfe81cb5ed231412d8b2e4"}, {"url": "https://git.kernel.org/stable/c/bf89b1f87c72df79cf76203f71fbf8349cd5c9de"}, {"url": "https://git.kernel.org/stable/c/e63052921f1b25a836feb1500b841bff7a4a0456"}, {"url": "https://git.kernel.org/stable/c/c8c14adf80bd1a6e4a1d7ee9c2a816881c26d17a"}, {"url": "https://git.kernel.org/stable/c/d02d2c98d25793902f65803ab853b592c7a96b29"}], "title": "fs: writeback: fix use-after-free in __mark_inode_dirty()", "x_generator": {"engine": "bippy-1.2.0"}}, "adp": [{"title": "CVE Program Container", "references": [{"url": "https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html"}], "providerMetadata": {"orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2025-11-03T17:44:17.299Z"}}, {"x_adpType": "supplier", 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S7-1500 CPU 1518-4 PN/DP MFP (6ES7518-4AX00-1AB0)", "versions": [{"status": "affected", "version": "V3.1.7", "lessThan": "*", "versionType": "custom"}], "defaultStatus": "unknown"}, {"vendor": "Siemens", "product": "SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (6ES7518-4AX00-1AC0)", "versions": [{"status": "affected", "version": "V3.1.5", "lessThan": "*", "versionType": "custom"}], "defaultStatus": "unknown"}, {"vendor": "Siemens", "product": "SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (6ES7518-4AX00-1AC0)", "versions": [{"status": "affected", "version": "V3.1.6", "lessThan": "*", "versionType": "custom"}], "defaultStatus": "unknown"}, {"vendor": "Siemens", "product": "SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (6ES7518-4AX00-1AC0)", "versions": [{"status": "affected", "version": "V3.1.7", "lessThan": "*", "versionType": "custom"}], "defaultStatus": "unknown"}, {"vendor": "Siemens", "product": "SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP (6ES7518-4FX00-1AB0)", "versions": [{"status": "affected", "version": 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{"url": "https://cert-portal.siemens.com/productcert/html/ssa-032379.html"}, {"url": "https://cert-portal.siemens.com/productcert/html/ssa-019113.html"}, {"url": "https://cert-portal.siemens.com/productcert/html/ssa-457936.html"}], "providerMetadata": {"orgId": "0b142b55-0307-4c5a-b3c9-f314f3fb7c5e", "shortName": "siemens-SADP", "dateUpdated": "2026-11-10T12:37:12.814Z"}}, {"title": "CISA ADP Vulnrichment", "metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2025-39866", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "total"}], "version": "2.0.3", "timestamp": "2026-10-15T21:54:28.454479Z"}}}], "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-10-15T21:54:29.374Z"}}], "cna": {"title": "fs: writeback: fix use-after-free in __mark_inode_dirty()", "metrics": [{"cvssV3_1": {"version": "3.1", "baseScore": 7.8, "baseSeverity": "HIGH", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"}, "scenarios": [{"lang": "en", "value": "AV:L - The vulnerable code is reached from an ordinary write(2) syscall (vfs_write \u2192 ext4_buffered_write_iter \u2192 file_modified \u2192 generic_update_time \u2192 __mark_inode_dirty), and the competing side requires local cgroup/writeback activity. No network protocol handler is involved.\nAC:L - The attacker drives both sides of the race \u2014 a multi-threaded write() loop dirties the inode while the attacker forces cgroup writeback switches by dirtying the file from a second memcg and tearing that cgroup down, making the old wb's last reference drop. Attempts are unlimited and the bug was observed occurring spontaneously during normal boot, and CONFIG_CGROUP_WRITEBACK is default-y on all mainstream kernels.\nPR:L - Only an unprivileged local account with write access to a file on a writeback-capable filesystem (ext4/xfs home or /tmp) is needed; cgroup manipulation used to widen the race is available to ordinary users through systemd's delegated per-user cgroup subtree.\nUI:N - The attacker triggers everything itself through its own write() syscalls and cgroup activity; no victim action or interaction is required.\nS:U - The use-after-free corrupts kernel heap memory within the same kernel security authority; there is no VM, IOMMU, or sandbox boundary crossed.\nC:H - The freed bdi_writeback is dereferenced as `wb->bdi->capabilities`, so a re-sprayed object yields an attacker-controlled pointer dereference and an arbitrary kernel-memory read primitive, enabling disclosure of arbitrary kernel data.\nI:H - wb_wakeup_delayed() writes into the freed object (spin_lock_irq on wb->work_lock) and inserts the freed `wb->dwork` timer into the timer wheel, giving list-write primitives and an attacker-controlled `timer->function` \u2014 a direct control-flow hijack path to arbitrary kernel code execution.\nA:H - The use-after-free reliably produces a kernel oops/panic as reported in the original crash trace (__mark_inode_dirty+0x124), and can be triggered repeatedly to crash the system."}]}], "affected": [{"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "0747259d13febfcc838980a63c414c9b920cea6f", "lessThan": "e2a14bbae5d8bacaa301362744a110e2be40a3a3", "versionType": "git"}, {"status": "affected", "version": "0747259d13febfcc838980a63c414c9b920cea6f", "lessThan": "b187c976111960e6e54a6b1fff724f6e3d39406c", "versionType": "git"}, {"status": "affected", "version": "0747259d13febfcc838980a63c414c9b920cea6f", "lessThan": "1edc2feb9c759a9883dfe81cb5ed231412d8b2e4", "versionType": "git"}, {"status": "affected", "version": "0747259d13febfcc838980a63c414c9b920cea6f", "lessThan": "bf89b1f87c72df79cf76203f71fbf8349cd5c9de", "versionType": "git"}, {"status": "affected", "version": "0747259d13febfcc838980a63c414c9b920cea6f", "lessThan": "e63052921f1b25a836feb1500b841bff7a4a0456", "versionType": "git"}, {"status": "affected", "version": "0747259d13febfcc838980a63c414c9b920cea6f", "lessThan": "c8c14adf80bd1a6e4a1d7ee9c2a816881c26d17a", "versionType": "git"}, {"status": "affected", "version": "0747259d13febfcc838980a63c414c9b920cea6f", "lessThan": "d02d2c98d25793902f65803ab853b592c7a96b29", "versionType": "git"}], "programFiles": ["fs/fs-writeback.c"], "defaultStatus": "unaffected"}, {"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "4.2"}, {"status": "unaffected", "version": "0", "lessThan": "4.2", "versionType": "semver"}, {"status": "unaffected", "version": "5.10.247", "versionType": "semver", "lessThanOrEqual": "5.10.*"}, {"status": "unaffected", "version": "5.15.192", "versionType": "semver", "lessThanOrEqual": "5.15.*"}, {"status": "unaffected", "version": "6.1.151", "versionType": "semver", "lessThanOrEqual": "6.1.*"}, {"status": "unaffected", "version": "6.6.105", "versionType": "semver", "lessThanOrEqual": "6.6.*"}, {"status": "unaffected", "version": "6.12.46", "versionType": "semver", "lessThanOrEqual": "6.12.*"}, {"status": "unaffected", "version": "6.16.6", "versionType": "semver", "lessThanOrEqual": "6.16.*"}, {"status": "unaffected", "version": "6.17", "versionType": "original_commit_for_fix", "lessThanOrEqual": "*"}], "programFiles": ["fs/fs-writeback.c"], "defaultStatus": "affected"}], "references": [{"url": "https://git.kernel.org/stable/c/e2a14bbae5d8bacaa301362744a110e2be40a3a3"}, {"url": "https://git.kernel.org/stable/c/b187c976111960e6e54a6b1fff724f6e3d39406c"}, {"url": "https://git.kernel.org/stable/c/1edc2feb9c759a9883dfe81cb5ed231412d8b2e4"}, {"url": "https://git.kernel.org/stable/c/bf89b1f87c72df79cf76203f71fbf8349cd5c9de"}, {"url": "https://git.kernel.org/stable/c/e63052921f1b25a836feb1500b841bff7a4a0456"}, {"url": "https://git.kernel.org/stable/c/c8c14adf80bd1a6e4a1d7ee9c2a816881c26d17a"}, {"url": "https://git.kernel.org/stable/c/d02d2c98d25793902f65803ab853b592c7a96b29"}], "x_generator": {"engine": "bippy-1.2.0"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nfs: writeback: fix use-after-free in __mark_inode_dirty()\n\nAn use-after-free issue occurred when __mark_inode_dirty() get the\nbdi_writeback that was in the progress of switching.\n\nCPU: 1 PID: 562 Comm: systemd-random- Not tainted 6.6.56-gb4403bd46a8e #1\n......\npstate: 60400005 (nZCv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--)\npc : __mark_inode_dirty+0x124/0x418\nlr : __mark_inode_dirty+0x118/0x418\nsp : ffffffc08c9dbbc0\n........\nCall trace:\n __mark_inode_dirty+0x124/0x418\n generic_update_time+0x4c/0x60\n file_modified+0xcc/0xd0\n ext4_buffered_write_iter+0x58/0x124\n ext4_file_write_iter+0x54/0x704\n vfs_write+0x1c0/0x308\n ksys_write+0x74/0x10c\n __arm64_sys_write+0x1c/0x28\n invoke_syscall+0x48/0x114\n el0_svc_common.constprop.0+0xc0/0xe0\n do_el0_svc+0x1c/0x28\n el0_svc+0x40/0xe4\n el0t_64_sync_handler+0x120/0x12c\n el0t_64_sync+0x194/0x198\n\nRoot cause is:\n\nsystemd-random-seed kworker\n----------------------------------------------------------------------\n___mark_inode_dirty inode_switch_wbs_work_fn\n\n spin_lock(&inode->i_lock);\n inode_attach_wb\n locked_inode_to_wb_and_lock_list\n get inode->i_wb\n spin_unlock(&inode->i_lock);\n spin_lock(&wb->list_lock)\n spin_lock(&inode->i_lock)\n inode_io_list_move_locked\n spin_unlock(&wb->list_lock)\n spin_unlock(&inode->i_lock)\n spin_lock(&old_wb->list_lock)\n inode_do_switch_wbs\n spin_lock(&inode->i_lock)\n inode->i_wb = new_wb\n spin_unlock(&inode->i_lock)\n spin_unlock(&old_wb->list_lock)\n wb_put_many(old_wb, nr_switched)\n cgwb_release\n old wb released\n wb_wakeup_delayed() accesses wb,\n then trigger the use-after-free\n issue\n\nFix this race condition by holding inode spinlock until\nwb_wakeup_delayed() finished."}], "cpeApplicability": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "5.10.247", "versionStartIncluding": "4.2"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "5.15.192", "versionStartIncluding": "4.2"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.1.151", "versionStartIncluding": "4.2"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.6.105", "versionStartIncluding": "4.2"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.12.46", "versionStartIncluding": "4.2"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.16.6", "versionStartIncluding": "4.2"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.17", "versionStartIncluding": "4.2"}], "operator": "OR"}]}], "providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T12:05:45.584Z"}}}, "cveMetadata": {"cveId": "CVE-2025-39866", "state": "PUBLISHED", "dateUpdated": "2026-11-10T12:37:12.814Z", "dateReserved": "2025-04-16T07:20:57.143Z", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "datePublished": "2025-09-19T15:26:35.725Z", "assignerShortName": "Linux"}, "dataVersion": "5.2"}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["fs/fs-writeback.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "e2a14bbae5d8bacaa301362744a110e2be40a3a3", "status": "affected", "version": "0747259d13febfcc838980a63c414c9b920cea6f", "versionType": "git"}, {"lessThan": "b187c976111960e6e54a6b1fff724f6e3d39406c", "status": "affected", "version": "0747259d13febfcc838980a63c414c9b920cea6f", "versionType": "git"}, {"lessThan": "1edc2feb9c759a9883dfe81cb5ed231412d8b2e4", "status": "affected", "version": "0747259d13febfcc838980a63c414c9b920cea6f", "versionType": "git"}, {"lessThan": "bf89b1f87c72df79cf76203f71fbf8349cd5c9de", "status": "affected", "version": "0747259d13febfcc838980a63c414c9b920cea6f", "versionType": "git"}, {"lessThan": "e63052921f1b25a836feb1500b841bff7a4a0456", "status": "affected", "version": "0747259d13febfcc838980a63c414c9b920cea6f", "versionType": "git"}, {"lessThan": "c8c14adf80bd1a6e4a1d7ee9c2a816881c26d17a", "status": "affected", "version": "0747259d13febfcc838980a63c414c9b920cea6f", "versionType": "git"}, {"lessThan": "d02d2c98d25793902f65803ab853b592c7a96b29", "status": "affected", "version": "0747259d13febfcc838980a63c414c9b920cea6f", "versionType": "git"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["fs/fs-writeback.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "4.2"}, {"lessThan": "4.2", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "5.10.*", "status": "unaffected", "version": "5.10.247", "versionType": "semver"}, {"lessThanOrEqual": "5.15.*", "status": "unaffected", "version": "5.15.192", "versionType": "semver"}, {"lessThanOrEqual": "6.1.*", "status": "unaffected", "version": "6.1.151", "versionType": "semver"}, {"lessThanOrEqual": "6.6.*", "status": "unaffected", "version": "6.6.105", "versionType": "semver"}, {"lessThanOrEqual": "6.12.*", "status": "unaffected", "version": "6.12.46", "versionType": "semver"}, {"lessThanOrEqual": "6.16.*", "status": "unaffected", "version": "6.16.6", "versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "6.17", "versionType": "original_commit_for_fix"}]}], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"affectedData": [{"defaultStatus": "unknown", "product": "SIMATIC CN 4100", "vendor": "Siemens", "versions": [{"lessThan": "V5.0", "status": "affected", "version": "0", "versionType": "custom"}]}, {"defaultStatus": "unknown", "product": "SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (6ES7518-4AX00-1AB0)", "vendor": "Siemens", "versions": [{"lessThan": "*", "status": "affected", "version": "V3.1.5", "versionType": "custom"}]}, {"defaultStatus": "unknown", "product": "SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (6ES7518-4AX00-1AB0)", "vendor": "Siemens", "versions": [{"lessThan": "*", "status": "affected", "version": "V3.1.6", "versionType": "custom"}]}, {"defaultStatus": "unknown", "product": "SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (6ES7518-4AX00-1AB0)", "vendor": "Siemens", "versions": [{"lessThan": "*", "status": "affected", "version": "V3.1.7", "versionType": "custom"}]}, {"defaultStatus": "unknown", "product": "SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (6ES7518-4AX00-1AC0)", "vendor": "Siemens", "versions": [{"lessThan": "*", "status": "affected", "version": "V3.1.5", "versionType": "custom"}]}, {"defaultStatus": "unknown", "product": "SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (6ES7518-4AX00-1AC0)", "vendor": "Siemens", "versions": [{"lessThan": "*", "status": "affected", "version": "V3.1.6", "versionType": "custom"}]}, {"defaultStatus": "unknown", "product": "SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (6ES7518-4AX00-1AC0)", "vendor": "Siemens", "versions": [{"lessThan": "*", "status": "affected", "version": "V3.1.7", "versionType": "custom"}]}, {"defaultStatus": "unknown", "product": "SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP (6ES7518-4FX00-1AB0)", "vendor": "Siemens", "versions": [{"lessThan": "*", "status": "affected", "version": "V3.1.5", "versionType": "custom"}]}, {"defaultStatus": "unknown", "product": "SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP (6ES7518-4FX00-1AB0)", "vendor": "Siemens", "versions": [{"lessThan": "*", "status": "affected", "version": "V3.1.6", "versionType": "custom"}]}, {"defaultStatus": "unknown", "product": "SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP (6ES7518-4FX00-1AB0)", "vendor": "Siemens", "versions": [{"lessThan": "*", "status": "affected", "version": "V3.1.7", "versionType": "custom"}]}, {"defaultStatus": "unknown", "product": "SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP (6ES7518-4FX00-1AC0)", "vendor": "Siemens", "versions": [{"lessThan": "*", "status": "affected", "version": "V3.1.5", "versionType": "custom"}]}, {"defaultStatus": "unknown", "product": "SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP (6ES7518-4FX00-1AC0)", "vendor": "Siemens", "versions": [{"lessThan": "*", "status": "affected", "version": "V3.1.6", "versionType": "custom"}]}, {"defaultStatus": "unknown", "product": "SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP (6ES7518-4FX00-1AC0)", "vendor": "Siemens", "versions": [{"lessThan": "*", "status": "affected", "version": "V3.1.7", "versionType": "custom"}]}, {"defaultStatus": "unknown", "product": "SIPLUS S7-1500 CPU 1518-4 PN/DP MFP (6AG1518-4AX00-4AC0)", "vendor": "Siemens", "versions": [{"lessThan": "*", "status": "affected", "version": "V3.1.5", "versionType": "custom"}]}, {"defaultStatus": "unknown", "product": "SIPLUS S7-1500 CPU 1518-4 PN/DP MFP (6AG1518-4AX00-4AC0)", "vendor": "Siemens", "versions": [{"lessThan": "*", "status": "affected", "version": "V3.1.6", "versionType": "custom"}]}, {"defaultStatus": "unknown", "product": "SIPLUS S7-1500 CPU 1518-4 PN/DP MFP (6AG1518-4AX00-4AC0)", "vendor": "Siemens", "versions": [{"lessThan": "*", "status": "affected", "version": "V3.1.7", "versionType": "custom"}]}], "source": "0b142b55-0307-4c5a-b3c9-f314f3fb7c5e"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "973B2007-ACEA-4C4E-9A34-FF155EE17424", "versionEndExcluding": "5.10.247", "versionStartIncluding": "4.2", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "8A911BD7-361F-45C0-A4A6-33FCBA0F6117", "versionEndExcluding": "5.15.192", "versionStartIncluding": "5.11", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "BC2D0B88-F133-4143-B91D-0A439AA143C0", "versionEndExcluding": "6.1.151", "versionStartIncluding": "5.16", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "B9364B0C-6B18-422E-8254-73EF0E856875", "versionEndExcluding": "6.6.105", "versionStartIncluding": "6.2", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "F7E2B332-E920-4CAC-B400-288602DB6F16", "versionEndExcluding": "6.12.46", "versionStartIncluding": "6.7", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "548F104C-0F08-438B-9C97-64C903F0C678", "versionEndExcluding": "6.16.6", "versionStartIncluding": "6.13", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:6.17:rc1:*:*:*:*:*:*", "matchCriteriaId": "327D22EF-390B-454C-BD31-2ED23C998A1C", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:6.17:rc2:*:*:*:*:*:*", "matchCriteriaId": "C730CD9A-D969-4A8E-9522-162AAF7C0EE9", "vulnerable": true}], "negate": false, "operator": "OR"}]}, {"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:o:debian:debian_linux:11.0:*:*:*:*:*:*:*", "matchCriteriaId": "FA6FEEC2-9F11-4643-8827-749718254FED", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nfs: writeback: fix use-after-free in __mark_inode_dirty()\n\nAn use-after-free issue occurred when __mark_inode_dirty() get the\nbdi_writeback that was in the progress of switching.\n\nCPU: 1 PID: 562 Comm: systemd-random- Not tainted 6.6.56-gb4403bd46a8e #1\n......\npstate: 60400005 (nZCv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--)\npc : __mark_inode_dirty+0x124/0x418\nlr : __mark_inode_dirty+0x118/0x418\nsp : ffffffc08c9dbbc0\n........\nCall trace:\n __mark_inode_dirty+0x124/0x418\n generic_update_time+0x4c/0x60\n file_modified+0xcc/0xd0\n ext4_buffered_write_iter+0x58/0x124\n ext4_file_write_iter+0x54/0x704\n vfs_write+0x1c0/0x308\n ksys_write+0x74/0x10c\n __arm64_sys_write+0x1c/0x28\n invoke_syscall+0x48/0x114\n el0_svc_common.constprop.0+0xc0/0xe0\n do_el0_svc+0x1c/0x28\n el0_svc+0x40/0xe4\n el0t_64_sync_handler+0x120/0x12c\n el0t_64_sync+0x194/0x198\n\nRoot cause is:\n\nsystemd-random-seed kworker\n----------------------------------------------------------------------\n___mark_inode_dirty inode_switch_wbs_work_fn\n\n spin_lock(&inode->i_lock);\n inode_attach_wb\n locked_inode_to_wb_and_lock_list\n get inode->i_wb\n spin_unlock(&inode->i_lock);\n spin_lock(&wb->list_lock)\n spin_lock(&inode->i_lock)\n inode_io_list_move_locked\n spin_unlock(&wb->list_lock)\n spin_unlock(&inode->i_lock)\n spin_lock(&old_wb->list_lock)\n inode_do_switch_wbs\n spin_lock(&inode->i_lock)\n inode->i_wb = new_wb\n spin_unlock(&inode->i_lock)\n spin_unlock(&old_wb->list_lock)\n wb_put_many(old_wb, nr_switched)\n cgwb_release\n old wb released\n wb_wakeup_delayed() accesses wb,\n then trigger the use-after-free\n issue\n\nFix this race condition by holding inode spinlock until\nwb_wakeup_delayed() finished."}, {"lang": "es", "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nfs: writeback: corrige uso despu\u00e9s de liberaci\u00f3n en __mark_inode_dirty()\n\nSe produjo un problema de uso despu\u00e9s de liberaci\u00f3n cuando __mark_inode_dirty() obtiene el bdi_writeback que estaba en proceso de cambio.\n\nCPU: 1 PID: 562 Comm: systemd-random- No contaminado 6.6.56-gb4403bd46a8e #1\n......\npstate: 60400005 (nZCv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--)\npc : __mark_inode_dirty+0x124/0x418\nlr : __mark_inode_dirty+0x118/0x418\nsp : ffffffc08c9dbbc0\n........\nTraza de llamada:\n __mark_inode_dirty+0x124/0x418\n generic_update_time+0x4c/0x60\n file_modified+0xcc/0xd0\n ext4_buffered_write_iter+0x58/0x124\n ext4_file_write_iter+0x54/0x704\n vfs_write+0x1c0/0x308\n ksys_write+0x74/0x10c\n __arm64_sys_write+0x1c/0x28\n invoke_syscall+0x48/0x114\n el0_svc_common.constprop.0+0xc0/0xe0\n do_el0_svc+0x1c/0x28\n el0_svc+0x40/0xe4\n el0t_64_sync_handler+0x120/0x12c\n el0t_64_sync+0x194/0x198\n\nLa causa ra\u00edz es:\n\nsystemd-random-seed kworker\n----------------------------------------------------------------------\n___mark_inode_dirty inode_switch_wbs_work_fn\n\n spin_lock(&inode->i_lock);\n inode_attach_wb\n locked_inode_to_wb_and_lock_list\n obtiene inode->i_wb\n spin_unlock(&inode->i_lock);\n spin_lock(&wb->list_lock)\n spin_lock(&inode->i_lock)\n inode_io_list_move_locked\n spin_unlock(&wb->list_lock)\n spin_unlock(&inode->i_lock)\n spin_lock(&old_wb->list_lock)\n inode_do_switch_wbs\n spin_lock(&inode->i_lock)\n inode->i_wb = new_wb\n spin_unlock(&inode->i_lock)\n spin_unlock(&old_wb->list_lock)\n wb_put_many(old_wb, nr_switched)\n cgwb_release\n old wb liberado\n wb_wakeup_delayed() accede a wb,\n luego activa el uso despu\u00e9s de liberaci\u00f3n\n problema\n\nCorrige esta condici\u00f3n de carrera manteniendo el spinlock del inodo hasta que wb_wakeup_delayed() finalice."}], "id": "CVE-2025-39866", "lastModified": "2026-11-10T13:17:51.997", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 7.8, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 5.9, "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary"}, {"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 7.8, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 5.9, "source": "nvd@nist.gov", "type": "Primary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2025-39866", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "total"}], "role": "CISA Coordinator", "timestamp": "2026-10-15T21:54:28.454479Z", "version": "2.0.3"}}]}, "published": "2025-09-19T16:15:45.657", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/1edc2feb9c759a9883dfe81cb5ed231412d8b2e4"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/b187c976111960e6e54a6b1fff724f6e3d39406c"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/bf89b1f87c72df79cf76203f71fbf8349cd5c9de"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/c8c14adf80bd1a6e4a1d7ee9c2a816881c26d17a"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/d02d2c98d25793902f65803ab853b592c7a96b29"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/e2a14bbae5d8bacaa301362744a110e2be40a3a3"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/e63052921f1b25a836feb1500b841bff7a4a0456"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Third Party Advisory"], "url": "https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html"}, {"source": "0b142b55-0307-4c5a-b3c9-f314f3fb7c5e", "url": "https://cert-portal.siemens.com/productcert/html/ssa-019113.html"}, {"source": "0b142b55-0307-4c5a-b3c9-f314f3fb7c5e", "url": "https://cert-portal.siemens.com/productcert/html/ssa-032379.html"}, {"source": "0b142b55-0307-4c5a-b3c9-f314f3fb7c5e", "url": "https://cert-portal.siemens.com/productcert/html/ssa-082556.html"}, {"source": "0b142b55-0307-4c5a-b3c9-f314f3fb7c5e", "url": "https://cert-portal.siemens.com/productcert/html/ssa-457936.html"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-416"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: fs: writeback: fix use-after-free in __mark_inode_dirty()", "id": "2396940", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2396940"}, "csaw": false, "cvss3": {"cvss3_base_score": "7.0", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H", "status": "draft"}, "details": ["No description is available for this CVE."], "name": "CVE-2025-39866", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Under investigation", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2025-09-19T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2025-39866\nhttps://nvd.nist.gov/vuln/detail/CVE-2025-39866\nhttps://lore.kernel.org/linux-cve-announce/2025091907-CVE-2025-39866-45d3@gregkh/T"], "threat_severity": "Important"}

{"created": "2025-09-22T09:59:09.256352+00:00", "updated": "2025-09-22T09:59:09.256415+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}