CVE-2024-26658

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2024-26658", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2024-02-19T14:20:24.147Z", "datePublished": "2024-04-02T06:22:08.468Z", "dateUpdated": "2026-05-11T20:01:39.895Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-05-11T20:01:39.895Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbcachefs: grab s_umount only if snapshotting\n\nWhen I was testing mongodb over bcachefs with compression,\nthere is a lockdep warning when snapshotting mongodb data volume.\n\n$ cat test.sh\nprog=bcachefs\n\n$prog subvolume create /mnt/data\n$prog subvolume create /mnt/data/snapshots\n\nwhile true;do\n $prog subvolume snapshot /mnt/data /mnt/data/snapshots/$(date +%s)\n sleep 1s\ndone\n\n$ cat /etc/mongodb.conf\nsystemLog:\n destination: file\n logAppend: true\n path: /mnt/data/mongod.log\n\nstorage:\n dbPath: /mnt/data/\n\nlockdep reports:\n[ 3437.452330] ======================================================\n[ 3437.452750] WARNING: possible circular locking dependency detected\n[ 3437.453168] 6.7.0-rc7-custom+ #85 Tainted: G E\n[ 3437.453562] ------------------------------------------------------\n[ 3437.453981] bcachefs/35533 is trying to acquire lock:\n[ 3437.454325] ffffa0a02b2b1418 (sb_writers#10){.+.+}-{0:0}, at: filename_create+0x62/0x190\n[ 3437.454875]\n but task is already holding lock:\n[ 3437.455268] ffffa0a02b2b10e0 (&type->s_umount_key#48){.+.+}-{3:3}, at: bch2_fs_file_ioctl+0x232/0xc90 [bcachefs]\n[ 3437.456009]\n which lock already depends on the new lock.\n\n[ 3437.456553]\n the existing dependency chain (in reverse order) is:\n[ 3437.457054]\n -> #3 (&type->s_umount_key#48){.+.+}-{3:3}:\n[ 3437.457507] down_read+0x3e/0x170\n[ 3437.457772] bch2_fs_file_ioctl+0x232/0xc90 [bcachefs]\n[ 3437.458206] __x64_sys_ioctl+0x93/0xd0\n[ 3437.458498] do_syscall_64+0x42/0xf0\n[ 3437.458779] entry_SYSCALL_64_after_hwframe+0x6e/0x76\n[ 3437.459155]\n -> #2 (&c->snapshot_create_lock){++++}-{3:3}:\n[ 3437.459615] down_read+0x3e/0x170\n[ 3437.459878] bch2_truncate+0x82/0x110 [bcachefs]\n[ 3437.460276] bchfs_truncate+0x254/0x3c0 [bcachefs]\n[ 3437.460686] notify_change+0x1f1/0x4a0\n[ 3437.461283] do_truncate+0x7f/0xd0\n[ 3437.461555] path_openat+0xa57/0xce0\n[ 3437.461836] do_filp_open+0xb4/0x160\n[ 3437.462116] do_sys_openat2+0x91/0xc0\n[ 3437.462402] __x64_sys_openat+0x53/0xa0\n[ 3437.462701] do_syscall_64+0x42/0xf0\n[ 3437.462982] entry_SYSCALL_64_after_hwframe+0x6e/0x76\n[ 3437.463359]\n -> #1 (&sb->s_type->i_mutex_key#15){+.+.}-{3:3}:\n[ 3437.463843] down_write+0x3b/0xc0\n[ 3437.464223] bch2_write_iter+0x5b/0xcc0 [bcachefs]\n[ 3437.464493] vfs_write+0x21b/0x4c0\n[ 3437.464653] ksys_write+0x69/0xf0\n[ 3437.464839] do_syscall_64+0x42/0xf0\n[ 3437.465009] entry_SYSCALL_64_after_hwframe+0x6e/0x76\n[ 3437.465231]\n -> #0 (sb_writers#10){.+.+}-{0:0}:\n[ 3437.465471] __lock_acquire+0x1455/0x21b0\n[ 3437.465656] lock_acquire+0xc6/0x2b0\n[ 3437.465822] mnt_want_write+0x46/0x1a0\n[ 3437.465996] filename_create+0x62/0x190\n[ 3437.466175] user_path_create+0x2d/0x50\n[ 3437.466352] bch2_fs_file_ioctl+0x2ec/0xc90 [bcachefs]\n[ 3437.466617] __x64_sys_ioctl+0x93/0xd0\n[ 3437.466791] do_syscall_64+0x42/0xf0\n[ 3437.466957] entry_SYSCALL_64_after_hwframe+0x6e/0x76\n[ 3437.467180]\n other info that might help us debug this:\n\n[ 3437.469670] 2 locks held by bcachefs/35533:\n other info that might help us debug this:\n\n[ 3437.467507] Chain exists of:\n sb_writers#10 --> &c->snapshot_create_lock --> &type->s_umount_key#48\n\n[ 3437.467979] Possible unsafe locking scenario:\n\n[ 3437.468223] CPU0 CPU1\n[ 3437.468405] ---- ----\n[ 3437.468585] rlock(&type->s_umount_key#48);\n[ 3437.468758] lock(&c->snapshot_create_lock);\n[ 3437.469030] lock(&type->s_umount_key#48);\n[ 3437.469291] rlock(sb_writers#10);\n[ 3437.469434]\n *** DEADLOCK ***\n\n[ 3437.469\n---truncated---"}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["fs/bcachefs/fs-ioctl.c"], "versions": [{"version": "1c6fdbd8f2465ddfb73a01ec620cbf3d14044e1a", "lessThan": "5b41d3fd04c6757b9c2a60a0c5b2609cae9999df", "status": "affected", "versionType": "git"}, {"version": "1c6fdbd8f2465ddfb73a01ec620cbf3d14044e1a", "lessThan": "2acc59dd88d27ad69b66ded80df16c042b04eeec", "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/bcachefs/fs-ioctl.c"], "versions": [{"version": "6.7", "status": "affected"}, {"version": "0", "lessThan": "6.7", "status": "unaffected", "versionType": "semver"}, {"version": "6.7.5", "lessThanOrEqual": "6.7.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.8", "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": "6.7", "versionEndExcluding": "6.7.5"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.7", "versionEndExcluding": "6.8"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/5b41d3fd04c6757b9c2a60a0c5b2609cae9999df"}, {"url": "https://git.kernel.org/stable/c/2acc59dd88d27ad69b66ded80df16c042b04eeec"}], "title": "bcachefs: grab s_umount only if snapshotting", "x_generator": {"engine": "bippy-1.2.0"}}, "adp": [{"title": "CISA ADP Vulnrichment", "metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2024-26658", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "partial"}], "version": "2.0.3", "timestamp": "2024-04-02T18:32:11.328360Z"}}}], "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2024-06-04T17:48:42.039Z"}}, {"providerMetadata": {"orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2024-08-02T00:14:12.825Z"}, "title": "CVE Program Container", "references": [{"url": "https://git.kernel.org/stable/c/5b41d3fd04c6757b9c2a60a0c5b2609cae9999df", "tags": ["x_transferred"]}, {"url": "https://git.kernel.org/stable/c/2acc59dd88d27ad69b66ded80df16c042b04eeec", "tags": ["x_transferred"]}]}]}}

{"dataType": "CVE_RECORD", "containers": {"adp": [{"title": "CVE Program Container", "references": [{"url": "https://git.kernel.org/stable/c/5b41d3fd04c6757b9c2a60a0c5b2609cae9999df", "tags": ["x_transferred"]}, {"url": "https://git.kernel.org/stable/c/2acc59dd88d27ad69b66ded80df16c042b04eeec", "tags": ["x_transferred"]}], "providerMetadata": {"orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2024-08-02T00:14:12.825Z"}}, {"metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2024-26658", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "partial"}], "version": "2.0.3", "timestamp": "2024-04-02T18:32:11.328360Z"}}}], "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2024-05-23T19:01:21.312Z"}, "title": "CISA ADP Vulnrichment"}], "cna": {"title": "bcachefs: grab s_umount only if snapshotting", "affected": [{"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "1c6fdbd8f2465ddfb73a01ec620cbf3d14044e1a", "lessThan": "5b41d3fd04c6757b9c2a60a0c5b2609cae9999df", "versionType": "git"}, {"status": "affected", "version": "1c6fdbd8f2465ddfb73a01ec620cbf3d14044e1a", "lessThan": "2acc59dd88d27ad69b66ded80df16c042b04eeec", "versionType": "git"}], "programFiles": ["fs/bcachefs/fs-ioctl.c"], "defaultStatus": "unaffected"}, {"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "6.7"}, {"status": "unaffected", "version": "0", "lessThan": "6.7", "versionType": "semver"}, {"status": "unaffected", "version": "6.7.5", "versionType": "semver", "lessThanOrEqual": "6.7.*"}, {"status": "unaffected", "version": "6.8", "versionType": "original_commit_for_fix", "lessThanOrEqual": "*"}], "programFiles": ["fs/bcachefs/fs-ioctl.c"], "defaultStatus": "affected"}], "references": [{"url": "https://git.kernel.org/stable/c/5b41d3fd04c6757b9c2a60a0c5b2609cae9999df"}, {"url": "https://git.kernel.org/stable/c/2acc59dd88d27ad69b66ded80df16c042b04eeec"}], "x_generator": {"engine": "bippy-1.2.0"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbcachefs: grab s_umount only if snapshotting\n\nWhen I was testing mongodb over bcachefs with compression,\nthere is a lockdep warning when snapshotting mongodb data volume.\n\n$ cat test.sh\nprog=bcachefs\n\n$prog subvolume create /mnt/data\n$prog subvolume create /mnt/data/snapshots\n\nwhile true;do\n $prog subvolume snapshot /mnt/data /mnt/data/snapshots/$(date +%s)\n sleep 1s\ndone\n\n$ cat /etc/mongodb.conf\nsystemLog:\n destination: file\n logAppend: true\n path: /mnt/data/mongod.log\n\nstorage:\n dbPath: /mnt/data/\n\nlockdep reports:\n[ 3437.452330] ======================================================\n[ 3437.452750] WARNING: possible circular locking dependency detected\n[ 3437.453168] 6.7.0-rc7-custom+ #85 Tainted: G E\n[ 3437.453562] ------------------------------------------------------\n[ 3437.453981] bcachefs/35533 is trying to acquire lock:\n[ 3437.454325] ffffa0a02b2b1418 (sb_writers#10){.+.+}-{0:0}, at: filename_create+0x62/0x190\n[ 3437.454875]\n but task is already holding lock:\n[ 3437.455268] ffffa0a02b2b10e0 (&type->s_umount_key#48){.+.+}-{3:3}, at: bch2_fs_file_ioctl+0x232/0xc90 [bcachefs]\n[ 3437.456009]\n which lock already depends on the new lock.\n\n[ 3437.456553]\n the existing dependency chain (in reverse order) is:\n[ 3437.457054]\n -> #3 (&type->s_umount_key#48){.+.+}-{3:3}:\n[ 3437.457507] down_read+0x3e/0x170\n[ 3437.457772] bch2_fs_file_ioctl+0x232/0xc90 [bcachefs]\n[ 3437.458206] __x64_sys_ioctl+0x93/0xd0\n[ 3437.458498] do_syscall_64+0x42/0xf0\n[ 3437.458779] entry_SYSCALL_64_after_hwframe+0x6e/0x76\n[ 3437.459155]\n -> #2 (&c->snapshot_create_lock){++++}-{3:3}:\n[ 3437.459615] down_read+0x3e/0x170\n[ 3437.459878] bch2_truncate+0x82/0x110 [bcachefs]\n[ 3437.460276] bchfs_truncate+0x254/0x3c0 [bcachefs]\n[ 3437.460686] notify_change+0x1f1/0x4a0\n[ 3437.461283] do_truncate+0x7f/0xd0\n[ 3437.461555] path_openat+0xa57/0xce0\n[ 3437.461836] do_filp_open+0xb4/0x160\n[ 3437.462116] do_sys_openat2+0x91/0xc0\n[ 3437.462402] __x64_sys_openat+0x53/0xa0\n[ 3437.462701] do_syscall_64+0x42/0xf0\n[ 3437.462982] entry_SYSCALL_64_after_hwframe+0x6e/0x76\n[ 3437.463359]\n -> #1 (&sb->s_type->i_mutex_key#15){+.+.}-{3:3}:\n[ 3437.463843] down_write+0x3b/0xc0\n[ 3437.464223] bch2_write_iter+0x5b/0xcc0 [bcachefs]\n[ 3437.464493] vfs_write+0x21b/0x4c0\n[ 3437.464653] ksys_write+0x69/0xf0\n[ 3437.464839] do_syscall_64+0x42/0xf0\n[ 3437.465009] entry_SYSCALL_64_after_hwframe+0x6e/0x76\n[ 3437.465231]\n -> #0 (sb_writers#10){.+.+}-{0:0}:\n[ 3437.465471] __lock_acquire+0x1455/0x21b0\n[ 3437.465656] lock_acquire+0xc6/0x2b0\n[ 3437.465822] mnt_want_write+0x46/0x1a0\n[ 3437.465996] filename_create+0x62/0x190\n[ 3437.466175] user_path_create+0x2d/0x50\n[ 3437.466352] bch2_fs_file_ioctl+0x2ec/0xc90 [bcachefs]\n[ 3437.466617] __x64_sys_ioctl+0x93/0xd0\n[ 3437.466791] do_syscall_64+0x42/0xf0\n[ 3437.466957] entry_SYSCALL_64_after_hwframe+0x6e/0x76\n[ 3437.467180]\n other info that might help us debug this:\n\n[ 3437.469670] 2 locks held by bcachefs/35533:\n other info that might help us debug this:\n\n[ 3437.467507] Chain exists of:\n sb_writers#10 --> &c->snapshot_create_lock --> &type->s_umount_key#48\n\n[ 3437.467979] Possible unsafe locking scenario:\n\n[ 3437.468223] CPU0 CPU1\n[ 3437.468405] ---- ----\n[ 3437.468585] rlock(&type->s_umount_key#48);\n[ 3437.468758] lock(&c->snapshot_create_lock);\n[ 3437.469030] lock(&type->s_umount_key#48);\n[ 3437.469291] rlock(sb_writers#10);\n[ 3437.469434]\n *** DEADLOCK ***\n\n[ 3437.469\n---truncated---"}], "cpeApplicability": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.7.5", "versionStartIncluding": "6.7"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.8", "versionStartIncluding": "6.7"}], "operator": "OR"}]}], "providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-05-11T20:01:39.895Z"}}}, "cveMetadata": {"cveId": "CVE-2024-26658", "state": "PUBLISHED", "dateUpdated": "2026-05-11T20:01:39.895Z", "dateReserved": "2024-02-19T14:20:24.147Z", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "datePublished": "2024-04-02T06:22:08.468Z", "assignerShortName": "Linux"}, "dataVersion": "5.2"}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["fs/bcachefs/fs-ioctl.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "5b41d3fd04c6757b9c2a60a0c5b2609cae9999df", "status": "affected", "version": "1c6fdbd8f2465ddfb73a01ec620cbf3d14044e1a", "versionType": "git"}, {"lessThan": "2acc59dd88d27ad69b66ded80df16c042b04eeec", "status": "affected", "version": "1c6fdbd8f2465ddfb73a01ec620cbf3d14044e1a", "versionType": "git"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["fs/bcachefs/fs-ioctl.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "6.7"}, {"lessThan": "6.7", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "6.7.*", "status": "unaffected", "version": "6.7.5", "versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "6.8", "versionType": "original_commit_for_fix"}]}], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "01925741-2C95-47C1-A7EA-3DC2BB0012D3", "versionEndExcluding": "6.7.5", "versionStartIncluding": "6.7", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbcachefs: grab s_umount only if snapshotting\n\nWhen I was testing mongodb over bcachefs with compression,\nthere is a lockdep warning when snapshotting mongodb data volume.\n\n$ cat test.sh\nprog=bcachefs\n\n$prog subvolume create /mnt/data\n$prog subvolume create /mnt/data/snapshots\n\nwhile true;do\n $prog subvolume snapshot /mnt/data /mnt/data/snapshots/$(date +%s)\n sleep 1s\ndone\n\n$ cat /etc/mongodb.conf\nsystemLog:\n destination: file\n logAppend: true\n path: /mnt/data/mongod.log\n\nstorage:\n dbPath: /mnt/data/\n\nlockdep reports:\n[ 3437.452330] ======================================================\n[ 3437.452750] WARNING: possible circular locking dependency detected\n[ 3437.453168] 6.7.0-rc7-custom+ #85 Tainted: G E\n[ 3437.453562] ------------------------------------------------------\n[ 3437.453981] bcachefs/35533 is trying to acquire lock:\n[ 3437.454325] ffffa0a02b2b1418 (sb_writers#10){.+.+}-{0:0}, at: filename_create+0x62/0x190\n[ 3437.454875]\n but task is already holding lock:\n[ 3437.455268] ffffa0a02b2b10e0 (&type->s_umount_key#48){.+.+}-{3:3}, at: bch2_fs_file_ioctl+0x232/0xc90 [bcachefs]\n[ 3437.456009]\n which lock already depends on the new lock.\n\n[ 3437.456553]\n the existing dependency chain (in reverse order) is:\n[ 3437.457054]\n -> #3 (&type->s_umount_key#48){.+.+}-{3:3}:\n[ 3437.457507] down_read+0x3e/0x170\n[ 3437.457772] bch2_fs_file_ioctl+0x232/0xc90 [bcachefs]\n[ 3437.458206] __x64_sys_ioctl+0x93/0xd0\n[ 3437.458498] do_syscall_64+0x42/0xf0\n[ 3437.458779] entry_SYSCALL_64_after_hwframe+0x6e/0x76\n[ 3437.459155]\n -> #2 (&c->snapshot_create_lock){++++}-{3:3}:\n[ 3437.459615] down_read+0x3e/0x170\n[ 3437.459878] bch2_truncate+0x82/0x110 [bcachefs]\n[ 3437.460276] bchfs_truncate+0x254/0x3c0 [bcachefs]\n[ 3437.460686] notify_change+0x1f1/0x4a0\n[ 3437.461283] do_truncate+0x7f/0xd0\n[ 3437.461555] path_openat+0xa57/0xce0\n[ 3437.461836] do_filp_open+0xb4/0x160\n[ 3437.462116] do_sys_openat2+0x91/0xc0\n[ 3437.462402] __x64_sys_openat+0x53/0xa0\n[ 3437.462701] do_syscall_64+0x42/0xf0\n[ 3437.462982] entry_SYSCALL_64_after_hwframe+0x6e/0x76\n[ 3437.463359]\n -> #1 (&sb->s_type->i_mutex_key#15){+.+.}-{3:3}:\n[ 3437.463843] down_write+0x3b/0xc0\n[ 3437.464223] bch2_write_iter+0x5b/0xcc0 [bcachefs]\n[ 3437.464493] vfs_write+0x21b/0x4c0\n[ 3437.464653] ksys_write+0x69/0xf0\n[ 3437.464839] do_syscall_64+0x42/0xf0\n[ 3437.465009] entry_SYSCALL_64_after_hwframe+0x6e/0x76\n[ 3437.465231]\n -> #0 (sb_writers#10){.+.+}-{0:0}:\n[ 3437.465471] __lock_acquire+0x1455/0x21b0\n[ 3437.465656] lock_acquire+0xc6/0x2b0\n[ 3437.465822] mnt_want_write+0x46/0x1a0\n[ 3437.465996] filename_create+0x62/0x190\n[ 3437.466175] user_path_create+0x2d/0x50\n[ 3437.466352] bch2_fs_file_ioctl+0x2ec/0xc90 [bcachefs]\n[ 3437.466617] __x64_sys_ioctl+0x93/0xd0\n[ 3437.466791] do_syscall_64+0x42/0xf0\n[ 3437.466957] entry_SYSCALL_64_after_hwframe+0x6e/0x76\n[ 3437.467180]\n other info that might help us debug this:\n\n[ 3437.469670] 2 locks held by bcachefs/35533:\n other info that might help us debug this:\n\n[ 3437.467507] Chain exists of:\n sb_writers#10 --> &c->snapshot_create_lock --> &type->s_umount_key#48\n\n[ 3437.467979] Possible unsafe locking scenario:\n\n[ 3437.468223] CPU0 CPU1\n[ 3437.468405] ---- ----\n[ 3437.468585] rlock(&type->s_umount_key#48);\n[ 3437.468758] lock(&c->snapshot_create_lock);\n[ 3437.469030] lock(&type->s_umount_key#48);\n[ 3437.469291] rlock(sb_writers#10);\n[ 3437.469434]\n *** DEADLOCK ***\n\n[ 3437.469\n---truncated---"}, {"lang": "es", "value": "En el kernel de Linux, se resolvi\u00f3 la siguiente vulnerabilidad: bcachefs: toma s_umount solo si se toma una instant\u00e1nea Cuando estaba probando mongodb sobre bcachefs con compresi\u00f3n, hay una advertencia de lockdep al tomar una instant\u00e1nea del volumen de datos de mongodb. $ cat test.sh prog=bcachefs $prog subvolumen crear /mnt/data $prog subvolumen crear /mnt/data/snapshots mientras es verdadero;do $prog subvolumen snapshot /mnt/data /mnt/data/snapshots/$(fecha +% s) dormir 1 hecho $ cat /etc/mongodb.conf systemLog: destino: archivo logAppend: verdadera ruta: /mnt/data/mongod.log almacenamiento: dbPath: /mnt/data/ lockdep informes: [3437.452330] ==== ==================================================== [ 3437.452750] ADVERTENCIA: posible dependencia de bloqueo circular detectada [ 3437.453168] 6.7.0-rc7-custom+ #85 Contaminado: GE [ 3437.453562] ---------------------- -------------------------------- [ 3437.453981] bcachefs/35533 est\u00e1 intentando adquirir el bloqueo: [ 3437.454325] ffffa0a02b2b1418 (sb_writers #10){.+.+}-{0:0}, en: filename_create+0x62/0x190 [ 3437.454875] pero la tarea ya mantiene el bloqueo: [ 3437.455268] ffffa0a02b2b10e0 (&type->s_umount_key#48){.+.+ }-{3:3}, en: bch2_fs_file_ioctl+0x232/0xc90 [bcachefs] [ 3437.456009] cuyo bloqueo ya depende del nuevo bloqueo. [ 3437.456553] la cadena de dependencia existente (en orden inverso) es: [ 3437.457054] -> #3 (&type->s_umount_key#48){.+.+}-{3:3}: [ 3437.457507] down_read+0x3e/0x170 [ 3437.457772] bch2_fs_file_ioctl+0x232/0xc90 [bcachefs] [ 3437.458206] __x64_sys_ioctl+0x93/0xd0 [ 3437.458498] do_syscall_64+0x42/0xf0 [ 3437.458 779] Entry_SYSCALL_64_after_hwframe+0x6e/0x76 [3437.459155] -> #2 (&c->snapshot_create_lock){+ +++}-{3:3}: [ 3437.459615] down_read+0x3e/0x170 [ 3437.459878] bch2_truncate+0x82/0x110 [bcachefs] [ 3437.460276] bchfs_truncate+0x254/0x3c0 [bcachefs] [ 3437.4 60686] notificar_cambio+0x1f1/0x4a0 [ 3437.461283] do_truncate+0x7f/0xd0 [ 3437.461555] path_openat+0xa57/0xce0 [ 3437.461836] do_filp_open+0xb4/0x160 [ 3437.462116] do_sys_openat2+0x91/0xc0 [ 34 37.462402] __x64_sys_openat+0x53/0xa0 [ 3437.462701] do_syscall_64+0x42/0xf0 [ 3437.462982] Entry_SYSCALL_64_after_hwframe+0x6e/0x76 [ 3437.463359] -> #1 (&sb->s_type->i_mutex_key#15){+.+.}-{3:3}: [ 3437.463843] down_write+0x3b/0xc0 [ 3437.464223] bch2_write_it e+0x5b /0xcc0 [bcachefs] [ 3437.464493] vfs_write+0x21b/0x4c0 [ 3437.464653] ksys_write+0x69/0xf0 [ 3437.464839] do_syscall_64+0x42/0xf0 [ 3437.465009] entrada_SYSCALL _64_after_hwframe+0x6e/0x76 [ 3437.465231] -> #0 (sb_writers#10){ .+.+}-{0:0}: [ 3437.465471] __lock_acquire+0x1455/0x21b0 [ 3437.465656] lock_acquire+0xc6/0x2b0 [ 3437.465822] mnt_want_write+0x46/0x1a0 [ 3437.465996] nombre de archivo _create+0x62/0x190 [ 3437.466175] ruta_usuario_create+0x2d /0x50 [ 3437.466352] bch2_fs_file_ioctl+0x2ec/0xc90 [bcachefs] [ 3437.466617] __x64_sys_ioctl+0x93/0xd0 [ 3437.466791] do_syscall_64+0x42/0xf0 [ 3437 .466957] Entry_SYSCALL_64_after_hwframe+0x6e/0x76 [ 3437.467180] otra informaci\u00f3n que podr\u00eda ayudarnos a depurar esto: [ 3437.469670] 2 bloqueos mantenidos por bcachefs/35533: otra informaci\u00f3n que podr\u00eda ayudarnos a depurar esto: [3437.467507] Existe cadena de: sb_writers#10 --> &c->snapshot_create_lock --> &type->s_umount_key#48 [3437.467979] Posiblemente inseguro escenario de bloqueo: [3437.468223] CPU0 CPU1 [3437.468405] ---- ---- [3437.468585] rlock(&type->s_umount_key#48); [ 3437.468758] bloqueo(&c->snapshot_create_lock); [ 3437.469030] bloqueo(&type->s_umount_key#48); [3437.469291] rlock(sb_writers#10); [ 3437.469434] *** INTERBLOQUEO *** [ 3437.469 ---truncado---"}], "id": "CVE-2024-26658", "lastModified": "2026-06-17T07:18:01.400", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 5.5, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 3.6, "source": "nvd@nist.gov", "type": "Primary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2024-26658", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2024-04-02T18:32:11.328360Z", "version": "2.0.3"}}]}, "published": "2024-04-02T07:15:42.903", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/2acc59dd88d27ad69b66ded80df16c042b04eeec"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/5b41d3fd04c6757b9c2a60a0c5b2609cae9999df"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/2acc59dd88d27ad69b66ded80df16c042b04eeec"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/5b41d3fd04c6757b9c2a60a0c5b2609cae9999df"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-667"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: bcachefs: grab s_umount only if snapshotting", "id": "2272777", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2272777"}, "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-833", "details": ["In the Linux kernel, the following vulnerability has been resolved:\nbcachefs: grab s_umount only if snapshotting\nWhen I was testing mongodb over bcachefs with compression,\nthere is a lockdep warning when snapshotting mongodb data volume.\n$ cat test.sh\nprog=bcachefs\n$prog subvolume create /mnt/data\n$prog subvolume create /mnt/data/snapshots\nwhile true;do\n$prog subvolume snapshot /mnt/data /mnt/data/snapshots/$(date +%s)\nsleep 1s\ndone\n$ cat /etc/mongodb.conf\nsystemLog:\ndestination: file\nlogAppend: true\npath: /mnt/data/mongod.log\nstorage:\ndbPath: /mnt/data/\nlockdep reports:\n[ 3437.452330] ======================================================\n[ 3437.452750] WARNING: possible circular locking dependency detected\n[ 3437.453168] 6.7.0-rc7-custom+ #85 Tainted: G E\n[ 3437.453562] ------------------------------------------------------\n[ 3437.453981] bcachefs/35533 is trying to acquire lock:\n[ 3437.454325] ffffa0a02b2b1418 (sb_writers#10){.+.+}-{0:0}, at: filename_create+0x62/0x190\n[ 3437.454875]\nbut task is already holding lock:\n[ 3437.455268] ffffa0a02b2b10e0 (&type->s_umount_key#48){.+.+}-{3:3}, at: bch2_fs_file_ioctl+0x232/0xc90 [bcachefs]\n[ 3437.456009]\nwhich lock already depends on the new lock.\n[ 3437.456553]\nthe existing dependency chain (in reverse order) is:\n[ 3437.457054]\n-> #3 (&type->s_umount_key#48){.+.+}-{3:3}:\n[ 3437.457507] down_read+0x3e/0x170\n[ 3437.457772] bch2_fs_file_ioctl+0x232/0xc90 [bcachefs]\n[ 3437.458206] __x64_sys_ioctl+0x93/0xd0\n[ 3437.458498] do_syscall_64+0x42/0xf0\n[ 3437.458779] entry_SYSCALL_64_after_hwframe+0x6e/0x76\n[ 3437.459155]\n-> #2 (&c->snapshot_create_lock){++++}-{3:3}:\n[ 3437.459615] down_read+0x3e/0x170\n[ 3437.459878] bch2_truncate+0x82/0x110 [bcachefs]\n[ 3437.460276] bchfs_truncate+0x254/0x3c0 [bcachefs]\n[ 3437.460686] notify_change+0x1f1/0x4a0\n[ 3437.461283] do_truncate+0x7f/0xd0\n[ 3437.461555] path_openat+0xa57/0xce0\n[ 3437.461836] do_filp_open+0xb4/0x160\n[ 3437.462116] do_sys_openat2+0x91/0xc0\n[ 3437.462402] __x64_sys_openat+0x53/0xa0\n[ 3437.462701] do_syscall_64+0x42/0xf0\n[ 3437.462982] entry_SYSCALL_64_after_hwframe+0x6e/0x76\n[ 3437.463359]\n-> #1 (&sb->s_type->i_mutex_key#15){+.+.}-{3:3}:\n[ 3437.463843] down_write+0x3b/0xc0\n[ 3437.464223] bch2_write_iter+0x5b/0xcc0 [bcachefs]\n[ 3437.464493] vfs_write+0x21b/0x4c0\n[ 3437.464653] ksys_write+0x69/0xf0\n[ 3437.464839] do_syscall_64+0x42/0xf0\n[ 3437.465009] entry_SYSCALL_64_after_hwframe+0x6e/0x76\n[ 3437.465231]\n-> #0 (sb_writers#10){.+.+}-{0:0}:\n[ 3437.465471] __lock_acquire+0x1455/0x21b0\n[ 3437.465656] lock_acquire+0xc6/0x2b0\n[ 3437.465822] mnt_want_write+0x46/0x1a0\n[ 3437.465996] filename_create+0x62/0x190\n[ 3437.466175] user_path_create+0x2d/0x50\n[ 3437.466352] bch2_fs_file_ioctl+0x2ec/0xc90 [bcachefs]\n[ 3437.466617] __x64_sys_ioctl+0x93/0xd0\n[ 3437.466791] do_syscall_64+0x42/0xf0\n[ 3437.466957] entry_SYSCALL_64_after_hwframe+0x6e/0x76\n[ 3437.467180]\nother info that might help us debug this:\n[ 3437.469670] 2 locks held by bcachefs/35533:\nother info that might help us debug this:\n[ 3437.467507] Chain exists of:\nsb_writers#10 --> &c->snapshot_create_lock --> &type->s_umount_key#48\n[ 3437.467979] Possible unsafe locking scenario:\n[ 3437.468223] CPU0 CPU1\n[ 3437.468405] ---- ----\n[ 3437.468585] rlock(&type->s_umount_key#48);\n[ 3437.468758] lock(&c->snapshot_create_lock);\n[ 3437.469030] lock(&type->s_umount_key#48);\n[ 3437.469291] rlock(sb_writers#10);\n[ 3437.469434]\n*** DEADLOCK ***\n[ 3437.469\n---truncated---", "A vulnerability was found in the bcachefs Linux kernel module which allows to a circular locking dependency, triggering a deadlock scenario during snapshot creation operations. This occurred due to the unconditional acquisition of s_umount in __bch2_ioctl_subvolume_create(), conflicting with existing locks held by other threads which leads to a deadlock situations."], "mitigation": {"lang": "en:us", "value": "Red Hat has investigated whether a possible mitigation exists for this issue, and has not been able to identify a practical example. Please update the affected package as soon as possible."}, "name": "CVE-2024-26658", "package_state": [{"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": "2024-04-02T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2024-26658\nhttps://nvd.nist.gov/vuln/detail/CVE-2024-26658\nhttps://lore.kernel.org/linux-cve-announce/2024040222-CVE-2024-26658-1451@gregkh/T"], "threat_severity": "Moderate"}

{}