CVE-2026-74321

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-74321", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-08-15T05:44:03.884Z", "datePublished": "2026-08-15T05:58:17.485Z", "dateUpdated": "2026-10-16T18:55:32.917Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-17T05:45:52.396Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbtrfs: fix invalid pointer dereference in __btrfs_run_delayed_refs()\n\nIn the beginning of the loop, we try to obtain a locked delayed ref head,\nif 'locked_ref' is currently NULL, by calling btrfs_select_ref_head(),\nwhich can return an error pointer. If the error pointer is -EAGAIN we do\na continue and go back to the beginning of the loop, which will not try\nagain to call btrfs_select_ref_head() since 'locked_ref' is no longer\nNULL but it's ERR_PTR(-EAGAIN), and then we do:\n\n spin_lock(&locked_ref->lock);\n\nagainst a ERR_PTR(-EAGAIN) value, generating an invalid pointer\ndereference.\n\nFix this by ensuring that 'locked_ref' is set to NULL when\nbtrfs_select_ref_head() returns ERR_PTR(-EAGAIN) and incrementing 'count'\nas well, to prevent infinite looping. We do this by doing a goto to the\nbottom of the loop that already sets 'locked_ref' to NULL and does a\ncond_resched(), with an increment to 'count' right before the goto.\nThese measures were in place before the refactoring in commit 0110a4c43451\n(\"btrfs: refactor __btrfs_run_delayed_refs loop\") but were unintentionally\nlost afterwards."}], "metrics": [{"cvssV3_1": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "baseScore": 7.5, "baseSeverity": "HIGH"}, "scenarios": [{"lang": "en", "value": "AV:N - On storage servers exporting btrfs via nfsd or ksmbd, remote client write/fsync/unlink I/O reaches btrfs_run_delayed_refs() and __btrfs_run_delayed_refs() in the server kernel without any local syscall; this is the highest-impact but reasonable deployment for btrfs metadata processing.\nAC:L - -EAGAIN is returned when a concurrent task deletes the delayed-ref head during btrfs_delayed_ref_lock(); an attacker controls both sides by driving parallel writes/unlinks/fsync or multiple NFS/SMB clients, reliably hitting the documented race without uncontrollable layout or victim state.\nPR:N - Exploitation needs only network write access to an NFS or SMB export of the btrfs filesystem; no local account, Linux capability, or init-namespace privilege is required when the export permits client writes (including anonymous/guest exports common on NAS appliances).\nUI:N - The fault is triggered entirely by the attacker's own concurrent filesystem I/O against an already-exported btrfs volume; no separate victim must mount a filesystem, open a file, or perform any interactive action beyond the attacker's own operations.\nS:U - The invalid pointer dereference and resulting kernel oops occur within the host kernel's btrfs delayed-ref processing; no VM escape, IOMMU bypass, or cross-sandbox boundary is crossed.\nC:N - The bug dereferences ERR_PTR(-EAGAIN), a small negative sentinel address, not freed or attacker-controlled memory; spin_lock faults immediately without returning kernel data, so there is no information-disclosure or read primitive.\nI:N - This is a logic error causing an invalid pointer dereference, not a use-after-free, out-of-bounds write, or type confusion; no kernel memory is modified before the faulting access aborts execution.\nA:H - Dereferencing ERR_PTR(-EAGAIN) in spin_lock(&locked_ref->lock) causes a kernel oops/panic during delayed-ref processing, which can hang or crash the host and deny all service on the affected btrfs filesystem; the condition is repeatable with concurrent I/O."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["fs/btrfs/extent-tree.c"], "versions": [{"version": "0110a4c43451533de1ea1bbdc57b5d452f9d8b25", "lessThan": "c372ca227e16bace86f1df1fa4ae6849e2fcfa28", "status": "affected", "versionType": "git"}, {"version": "0110a4c43451533de1ea1bbdc57b5d452f9d8b25", "lessThan": "a71143590ce9764dbcb47617647592ff8b4d48bc", "status": "affected", "versionType": "git"}, {"version": "0110a4c43451533de1ea1bbdc57b5d452f9d8b25", "lessThan": "65770111a2d47c2b15e20b2ba92bb12198f289d4", "status": "affected", "versionType": "git"}, {"version": "0110a4c43451533de1ea1bbdc57b5d452f9d8b25", "lessThan": "015dc4a1e0c2cba551d4620eba13d26d5081dc34", "status": "affected", "versionType": "git"}, {"version": "0110a4c43451533de1ea1bbdc57b5d452f9d8b25", "lessThan": "ba9fa2ff5981589bb49094d3358c339b37c47f53", "status": "affected", "versionType": "git"}, {"version": "0110a4c43451533de1ea1bbdc57b5d452f9d8b25", "lessThan": "3b15d02be05e74321adb1e0ae0cb4ccfba7c6cb1", "status": "affected", "versionType": "git"}, {"version": "0110a4c43451533de1ea1bbdc57b5d452f9d8b25", "lessThan": "9faa6b69ad73f03c7bde53e07d75a28822dc9a1a", "status": "affected", "versionType": "git"}, {"version": "0110a4c43451533de1ea1bbdc57b5d452f9d8b25", "lessThan": "486f8298b6188ff11ef1f4be7f1d5d2e4d1b1fae", "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/btrfs/extent-tree.c"], "versions": [{"version": "4.20", "status": "affected"}, {"version": "0", "lessThan": "4.20", "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": "4.20", "versionEndExcluding": "5.10.261"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.20", "versionEndExcluding": "5.15.212"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.20", "versionEndExcluding": "6.1.178"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.20", "versionEndExcluding": "6.6.145"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.20", "versionEndExcluding": "6.12.97"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.20", "versionEndExcluding": "6.18.40"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.20", "versionEndExcluding": "7.1.5"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.20", "versionEndExcluding": "7.2"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/c372ca227e16bace86f1df1fa4ae6849e2fcfa28"}, {"url": "https://git.kernel.org/stable/c/a71143590ce9764dbcb47617647592ff8b4d48bc"}, {"url": "https://git.kernel.org/stable/c/65770111a2d47c2b15e20b2ba92bb12198f289d4"}, {"url": "https://git.kernel.org/stable/c/015dc4a1e0c2cba551d4620eba13d26d5081dc34"}, {"url": "https://git.kernel.org/stable/c/ba9fa2ff5981589bb49094d3358c339b37c47f53"}, {"url": "https://git.kernel.org/stable/c/3b15d02be05e74321adb1e0ae0cb4ccfba7c6cb1"}, {"url": "https://git.kernel.org/stable/c/9faa6b69ad73f03c7bde53e07d75a28822dc9a1a"}, {"url": "https://git.kernel.org/stable/c/486f8298b6188ff11ef1f4be7f1d5d2e4d1b1fae"}], "title": "btrfs: fix invalid pointer dereference in __btrfs_run_delayed_refs()", "x_generator": {"engine": "bippy-1.2.0"}}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2026-74321", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "yes"}, {"Technical Impact": "partial"}], "version": "2.0.3", "timestamp": "2026-10-16T18:53:22.742693Z"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-10-16T18:55:32.917Z"}}]}}

{"dataType": "CVE_RECORD", "containers": {"adp": [{"title": "CISA ADP Vulnrichment", "metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2026-74321", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "yes"}, {"Technical Impact": "partial"}], "version": "2.0.3", "timestamp": "2026-10-16T18:53:22.742693Z"}}}], "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-10-16T18:53:23.377Z"}}], "cna": {"title": "btrfs: fix invalid pointer dereference in __btrfs_run_delayed_refs()", "metrics": [{"cvssV3_1": {"version": "3.1", "baseScore": 7.5, "baseSeverity": "HIGH", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"}, "scenarios": [{"lang": "en", "value": "AV:N - On storage servers exporting btrfs via nfsd or ksmbd, remote client write/fsync/unlink I/O reaches btrfs_run_delayed_refs() and __btrfs_run_delayed_refs() in the server kernel without any local syscall; this is the highest-impact but reasonable deployment for btrfs metadata processing.\nAC:L - -EAGAIN is returned when a concurrent task deletes the delayed-ref head during btrfs_delayed_ref_lock(); an attacker controls both sides by driving parallel writes/unlinks/fsync or multiple NFS/SMB clients, reliably hitting the documented race without uncontrollable layout or victim state.\nPR:N - Exploitation needs only network write access to an NFS or SMB export of the btrfs filesystem; no local account, Linux capability, or init-namespace privilege is required when the export permits client writes (including anonymous/guest exports common on NAS appliances).\nUI:N - The fault is triggered entirely by the attacker's own concurrent filesystem I/O against an already-exported btrfs volume; no separate victim must mount a filesystem, open a file, or perform any interactive action beyond the attacker's own operations.\nS:U - The invalid pointer dereference and resulting kernel oops occur within the host kernel's btrfs delayed-ref processing; no VM escape, IOMMU bypass, or cross-sandbox boundary is crossed.\nC:N - The bug dereferences ERR_PTR(-EAGAIN), a small negative sentinel address, not freed or attacker-controlled memory; spin_lock faults immediately without returning kernel data, so there is no information-disclosure or read primitive.\nI:N - This is a logic error causing an invalid pointer dereference, not a use-after-free, out-of-bounds write, or type confusion; no kernel memory is modified before the faulting access aborts execution.\nA:H - Dereferencing ERR_PTR(-EAGAIN) in spin_lock(&locked_ref->lock) causes a kernel oops/panic during delayed-ref processing, which can hang or crash the host and deny all service on the affected btrfs filesystem; the condition is repeatable with concurrent I/O."}]}], "affected": [{"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "0110a4c43451533de1ea1bbdc57b5d452f9d8b25", "lessThan": "c372ca227e16bace86f1df1fa4ae6849e2fcfa28", "versionType": "git"}, {"status": "affected", "version": "0110a4c43451533de1ea1bbdc57b5d452f9d8b25", "lessThan": "a71143590ce9764dbcb47617647592ff8b4d48bc", "versionType": "git"}, {"status": "affected", "version": "0110a4c43451533de1ea1bbdc57b5d452f9d8b25", "lessThan": "65770111a2d47c2b15e20b2ba92bb12198f289d4", "versionType": "git"}, {"status": "affected", "version": "0110a4c43451533de1ea1bbdc57b5d452f9d8b25", "lessThan": "015dc4a1e0c2cba551d4620eba13d26d5081dc34", "versionType": "git"}, {"status": "affected", "version": "0110a4c43451533de1ea1bbdc57b5d452f9d8b25", "lessThan": "ba9fa2ff5981589bb49094d3358c339b37c47f53", "versionType": "git"}, {"status": "affected", "version": "0110a4c43451533de1ea1bbdc57b5d452f9d8b25", "lessThan": "3b15d02be05e74321adb1e0ae0cb4ccfba7c6cb1", "versionType": "git"}, {"status": "affected", "version": "0110a4c43451533de1ea1bbdc57b5d452f9d8b25", "lessThan": "9faa6b69ad73f03c7bde53e07d75a28822dc9a1a", "versionType": "git"}, {"status": "affected", "version": "0110a4c43451533de1ea1bbdc57b5d452f9d8b25", "lessThan": "486f8298b6188ff11ef1f4be7f1d5d2e4d1b1fae", "versionType": "git"}], "programFiles": ["fs/btrfs/extent-tree.c"], "defaultStatus": "unaffected"}, {"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "4.20"}, {"status": "unaffected", "version": "0", "lessThan": "4.20", "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/btrfs/extent-tree.c"], "defaultStatus": "affected"}], "references": [{"url": "https://git.kernel.org/stable/c/c372ca227e16bace86f1df1fa4ae6849e2fcfa28"}, {"url": "https://git.kernel.org/stable/c/a71143590ce9764dbcb47617647592ff8b4d48bc"}, {"url": "https://git.kernel.org/stable/c/65770111a2d47c2b15e20b2ba92bb12198f289d4"}, {"url": "https://git.kernel.org/stable/c/015dc4a1e0c2cba551d4620eba13d26d5081dc34"}, {"url": "https://git.kernel.org/stable/c/ba9fa2ff5981589bb49094d3358c339b37c47f53"}, {"url": "https://git.kernel.org/stable/c/3b15d02be05e74321adb1e0ae0cb4ccfba7c6cb1"}, {"url": "https://git.kernel.org/stable/c/9faa6b69ad73f03c7bde53e07d75a28822dc9a1a"}, {"url": "https://git.kernel.org/stable/c/486f8298b6188ff11ef1f4be7f1d5d2e4d1b1fae"}], "x_generator": {"engine": "bippy-1.2.0"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbtrfs: fix invalid pointer dereference in __btrfs_run_delayed_refs()\n\nIn the beginning of the loop, we try to obtain a locked delayed ref head,\nif 'locked_ref' is currently NULL, by calling btrfs_select_ref_head(),\nwhich can return an error pointer. If the error pointer is -EAGAIN we do\na continue and go back to the beginning of the loop, which will not try\nagain to call btrfs_select_ref_head() since 'locked_ref' is no longer\nNULL but it's ERR_PTR(-EAGAIN), and then we do:\n\n spin_lock(&locked_ref->lock);\n\nagainst a ERR_PTR(-EAGAIN) value, generating an invalid pointer\ndereference.\n\nFix this by ensuring that 'locked_ref' is set to NULL when\nbtrfs_select_ref_head() returns ERR_PTR(-EAGAIN) and incrementing 'count'\nas well, to prevent infinite looping. We do this by doing a goto to the\nbottom of the loop that already sets 'locked_ref' to NULL and does a\ncond_resched(), with an increment to 'count' right before the goto.\nThese measures were in place before the refactoring in commit 0110a4c43451\n(\"btrfs: refactor __btrfs_run_delayed_refs loop\") but were unintentionally\nlost afterwards."}], "cpeApplicability": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "5.10.261", "versionStartIncluding": "4.20"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "5.15.212", "versionStartIncluding": "4.20"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.1.178", "versionStartIncluding": "4.20"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.6.145", "versionStartIncluding": "4.20"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.12.97", "versionStartIncluding": "4.20"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.18.40", "versionStartIncluding": "4.20"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "7.1.5", "versionStartIncluding": "4.20"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "7.2", "versionStartIncluding": "4.20"}], "operator": "OR"}]}], "providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-17T05:45:52.396Z"}}}, "cveMetadata": {"cveId": "CVE-2026-74321", "state": "PUBLISHED", "dateUpdated": "2026-10-16T18:55:32.917Z", "dateReserved": "2026-08-15T05:44:03.884Z", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "datePublished": "2026-08-15T05:58:17.485Z", "assignerShortName": "Linux"}, "dataVersion": "5.2"}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["fs/btrfs/extent-tree.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "c372ca227e16bace86f1df1fa4ae6849e2fcfa28", "status": "affected", "version": "0110a4c43451533de1ea1bbdc57b5d452f9d8b25", "versionType": "git"}, {"lessThan": "a71143590ce9764dbcb47617647592ff8b4d48bc", "status": "affected", "version": "0110a4c43451533de1ea1bbdc57b5d452f9d8b25", "versionType": "git"}, {"lessThan": "65770111a2d47c2b15e20b2ba92bb12198f289d4", "status": "affected", "version": "0110a4c43451533de1ea1bbdc57b5d452f9d8b25", "versionType": "git"}, {"lessThan": "015dc4a1e0c2cba551d4620eba13d26d5081dc34", "status": "affected", "version": "0110a4c43451533de1ea1bbdc57b5d452f9d8b25", "versionType": "git"}, {"lessThan": "ba9fa2ff5981589bb49094d3358c339b37c47f53", "status": "affected", "version": "0110a4c43451533de1ea1bbdc57b5d452f9d8b25", "versionType": "git"}, {"lessThan": "3b15d02be05e74321adb1e0ae0cb4ccfba7c6cb1", "status": "affected", "version": "0110a4c43451533de1ea1bbdc57b5d452f9d8b25", "versionType": "git"}, {"lessThan": "9faa6b69ad73f03c7bde53e07d75a28822dc9a1a", "status": "affected", "version": "0110a4c43451533de1ea1bbdc57b5d452f9d8b25", "versionType": "git"}, {"lessThan": "486f8298b6188ff11ef1f4be7f1d5d2e4d1b1fae", "status": "affected", "version": "0110a4c43451533de1ea1bbdc57b5d452f9d8b25", "versionType": "git"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["fs/btrfs/extent-tree.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "4.20"}, {"lessThan": "4.20", "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\nbtrfs: fix invalid pointer dereference in __btrfs_run_delayed_refs()\n\nIn the beginning of the loop, we try to obtain a locked delayed ref head,\nif 'locked_ref' is currently NULL, by calling btrfs_select_ref_head(),\nwhich can return an error pointer. If the error pointer is -EAGAIN we do\na continue and go back to the beginning of the loop, which will not try\nagain to call btrfs_select_ref_head() since 'locked_ref' is no longer\nNULL but it's ERR_PTR(-EAGAIN), and then we do:\n\n spin_lock(&locked_ref->lock);\n\nagainst a ERR_PTR(-EAGAIN) value, generating an invalid pointer\ndereference.\n\nFix this by ensuring that 'locked_ref' is set to NULL when\nbtrfs_select_ref_head() returns ERR_PTR(-EAGAIN) and incrementing 'count'\nas well, to prevent infinite looping. We do this by doing a goto to the\nbottom of the loop that already sets 'locked_ref' to NULL and does a\ncond_resched(), with an increment to 'count' right before the goto.\nThese measures were in place before the refactoring in commit 0110a4c43451\n(\"btrfs: refactor __btrfs_run_delayed_refs loop\") but were unintentionally\nlost afterwards."}], "id": "CVE-2026-74321", "lastModified": "2026-10-16T19:17:39.263", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 7.5, "baseSeverity": "HIGH", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 3.6, "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-74321", "options": [{"exploitation": "none"}, {"automatable": "yes"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-10-16T18:53:22.742693Z", "version": "2.0.3"}}]}, "published": "2026-08-15T06:22:32.600", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/015dc4a1e0c2cba551d4620eba13d26d5081dc34"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/3b15d02be05e74321adb1e0ae0cb4ccfba7c6cb1"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/486f8298b6188ff11ef1f4be7f1d5d2e4d1b1fae"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/65770111a2d47c2b15e20b2ba92bb12198f289d4"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/9faa6b69ad73f03c7bde53e07d75a28822dc9a1a"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/a71143590ce9764dbcb47617647592ff8b4d48bc"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/ba9fa2ff5981589bb49094d3358c339b37c47f53"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/c372ca227e16bace86f1df1fa4ae6849e2fcfa28"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Received"}

{"bugzilla": {"description": "kernel: btrfs: fix invalid pointer dereference in __btrfs_run_delayed_refs()", "id": "2516808", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2516808"}, "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-476", "details": ["A flaw was found in the btrfs file system component of the Linux kernel. This vulnerability occurs in the `__btrfs_run_delayed_refs()` function when an error condition is not properly handled, leading to an invalid pointer dereference. A local attacker could potentially exploit this flaw to cause a system crash, resulting in a Denial of Service (DoS)."], "name": "CVE-2026-74321", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Out of support scope", "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-2026-74321\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-74321\nhttps://lore.kernel.org/linux-cve-announce/2026081553-CVE-2026-74321-a221@gregkh/T"], "threat_severity": "Moderate"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[0110a4c43451533de1ea1bbdc57b5d452f9d8b25,c372ca227e16bace86f1df1fa4ae6849e2fcfa28)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[0110a4c43451533de1ea1bbdc57b5d452f9d8b25,a71143590ce9764dbcb47617647592ff8b4d48bc)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[0110a4c43451533de1ea1bbdc57b5d452f9d8b25,65770111a2d47c2b15e20b2ba92bb12198f289d4)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[0110a4c43451533de1ea1bbdc57b5d452f9d8b25,015dc4a1e0c2cba551d4620eba13d26d5081dc34)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[0110a4c43451533de1ea1bbdc57b5d452f9d8b25,ba9fa2ff5981589bb49094d3358c339b37c47f53)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[0110a4c43451533de1ea1bbdc57b5d452f9d8b25,3b15d02be05e74321adb1e0ae0cb4ccfba7c6cb1)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[0110a4c43451533de1ea1bbdc57b5d452f9d8b25,9faa6b69ad73f03c7bde53e07d75a28822dc9a1a)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[0110a4c43451533de1ea1bbdc57b5d452f9d8b25,486f8298b6188ff11ef1f4be7f1d5d2e4d1b1fae)"}}], "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": "generic", "value": "4.20"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[0,4.20)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[5.10.261,5.10.*]"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[5.15.212,5.15.*]"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[6.1.178,6.1.*]"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[6.6.145,6.6.*]"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[6.12.97,6.12.*]"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[6.18.40,6.18.*]"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[7.1.5,7.1.*]"}}, {"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": "2026-08-15T16:45:10.769523+00:00", "updated": "2026-08-22T00:30:16.956363+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}