{"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": "2026-08-15T05:58:17.485Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-15T05:58:17.485Z"}, "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."}], "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-rc1", "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-rc1"}]}]}], "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"}}}}

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{"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-rc1", "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": "2026-08-15T06:22:32.600", "metrics": {}, "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"}

{}

{}