CVE-2026-31666

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If the first key in\nthe next leaf does not match (different objectid or type), the function\nreturns 0 instead of -ENOENT, making the caller believe the lookup\nsucceeded when it did not. This can lead to operations on the wrong\nextent tree item, potentially causing extent tree corruption.\n\nFix this by returning -ENOENT directly when the key does not match,\ninstead of relying on the ret variable."}], "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 Btrfs extent-reference code is reached through local filesystem syscalls such as reflink/dedupe, truncate, unlink, and hole punching on a writable mounted Btrfs filesystem.\nAC:L - The trigger depends on attacker-shaped filesystem metadata and ordinary repeated file operations, not on a race or condition outside attacker control; when uncertain, the lower-complexity value is appropriate.\nPR:L - A basic unprivileged local user with write access to files on the Btrfs mount can exercise the relevant paths; no real root or init-namespace capability is required.\nUI:N - No separate victim action is required after the attacker has local access to a writable Btrfs filesystem; the attacker can issue the file operations directly.\nS:U - The impact remains within the local kernel/filesystem security authority and does not cross a VM, IOMMU, or similar security boundary.\nC:H - Incorrectly deleting or decrementing the wrong extent data reference can corrupt Btrfs extent ownership, plausibly causing stale or unrelated file data exposure through block reuse or aliasing.\nI:H - The bug can operate on the wrong extent tree item and corrupt filesystem metadata, plausibly enabling corruption or loss of arbitrary file data beyond the attacker's own intended files.\nA:H - The corrupted extent tree path can trigger transaction aborts, read-only remounts, BUG_ON/oops conditions, or persistent filesystem corruption, causing high availability impact."}]}], "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": "1618aa3c2e0163f5ac34d514ae89474521910536", "lessThan": "4125a194db4a6cf91f619f38788272651cb97dce", "status": "affected", "versionType": "git"}, {"version": "1618aa3c2e0163f5ac34d514ae89474521910536", "lessThan": "450e6a685d0cad95b15f8af152057bd0bf79f50b", "status": "affected", "versionType": "git"}, {"version": "1618aa3c2e0163f5ac34d514ae89474521910536", "lessThan": "ab1e022379c3c811aa72da8eb0c7507859a1d0f5", "status": "affected", "versionType": "git"}, {"version": "1618aa3c2e0163f5ac34d514ae89474521910536", "lessThan": "316fb1b3169efb081d2db910cbbfef445afa03b9", "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": "6.10", "status": "affected"}, {"version": "0", "lessThan": "6.10", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.82", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.23", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.19.13", "lessThanOrEqual": "6.19.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.0", "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": "6.10", "versionEndExcluding": "6.12.82"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.10", "versionEndExcluding": "6.18.23"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.10", "versionEndExcluding": "6.19.13"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.10", "versionEndExcluding": "7.0"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/4125a194db4a6cf91f619f38788272651cb97dce"}, {"url": "https://git.kernel.org/stable/c/450e6a685d0cad95b15f8af152057bd0bf79f50b"}, {"url": "https://git.kernel.org/stable/c/ab1e022379c3c811aa72da8eb0c7507859a1d0f5"}, {"url": "https://git.kernel.org/stable/c/316fb1b3169efb081d2db910cbbfef445afa03b9"}], "title": "btrfs: fix incorrect return value after changing leaf in lookup_extent_data_ref()", "x_generator": {"engine": "bippy-1.2.0"}}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2026-31666", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "total"}], "version": "2.0.3", "timestamp": "2026-10-16T15:11:52.641665Z"}}}], "problemTypes": [{"descriptions": [{"lang": "en", "type": "CWE", "cweId": "CWE-754", "description": "CWE-754 Improper Check for Unusual or Exceptional Conditions"}]}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-10-19T18:56:02.816Z"}}]}}

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If the first key in\nthe next leaf does not match (different objectid or type), the function\nreturns 0 instead of -ENOENT, making the caller believe the lookup\nsucceeded when it did not. This can lead to operations on the wrong\nextent tree item, potentially causing extent tree corruption.\n\nFix this by returning -ENOENT directly when the key does not match,\ninstead of relying on the ret variable."}], "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 Btrfs extent-reference code is reached through local filesystem syscalls such as reflink/dedupe, truncate, unlink, and hole punching on a writable mounted Btrfs filesystem.\nAC:L - The trigger depends on attacker-shaped filesystem metadata and ordinary repeated file operations, not on a race or condition outside attacker control; when uncertain, the lower-complexity value is appropriate.\nPR:L - A basic unprivileged local user with write access to files on the Btrfs mount can exercise the relevant paths; no real root or init-namespace capability is required.\nUI:N - No separate victim action is required after the attacker has local access to a writable Btrfs filesystem; the attacker can issue the file operations directly.\nS:U - The impact remains within the local kernel/filesystem security authority and does not cross a VM, IOMMU, or similar security boundary.\nC:H - Incorrectly deleting or decrementing the wrong extent data reference can corrupt Btrfs extent ownership, plausibly causing stale or unrelated file data exposure through block reuse or aliasing.\nI:H - The bug can operate on the wrong extent tree item and corrupt filesystem metadata, plausibly enabling corruption or loss of arbitrary file data beyond the attacker's own intended files.\nA:H - The corrupted extent tree path can trigger transaction aborts, read-only remounts, BUG_ON/oops conditions, or persistent filesystem corruption, causing high availability impact."}]}], "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": "1618aa3c2e0163f5ac34d514ae89474521910536", "lessThan": "4125a194db4a6cf91f619f38788272651cb97dce", "status": "affected", "versionType": "git"}, {"version": "1618aa3c2e0163f5ac34d514ae89474521910536", "lessThan": "450e6a685d0cad95b15f8af152057bd0bf79f50b", "status": "affected", "versionType": "git"}, {"version": "1618aa3c2e0163f5ac34d514ae89474521910536", "lessThan": "ab1e022379c3c811aa72da8eb0c7507859a1d0f5", "status": "affected", "versionType": "git"}, {"version": "1618aa3c2e0163f5ac34d514ae89474521910536", "lessThan": "316fb1b3169efb081d2db910cbbfef445afa03b9", "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": "6.10", "status": "affected"}, {"version": "0", "lessThan": "6.10", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.82", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.23", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.19.13", "lessThanOrEqual": "6.19.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.0", "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": "6.10", "versionEndExcluding": "6.12.82"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.10", "versionEndExcluding": "6.18.23"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.10", "versionEndExcluding": "6.19.13"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.10", "versionEndExcluding": "7.0"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/4125a194db4a6cf91f619f38788272651cb97dce"}, {"url": "https://git.kernel.org/stable/c/450e6a685d0cad95b15f8af152057bd0bf79f50b"}, {"url": "https://git.kernel.org/stable/c/ab1e022379c3c811aa72da8eb0c7507859a1d0f5"}, {"url": "https://git.kernel.org/stable/c/316fb1b3169efb081d2db910cbbfef445afa03b9"}], "title": "btrfs: fix incorrect return value after changing leaf in lookup_extent_data_ref()", "x_generator": {"engine": "bippy-1.2.0"}}, "adp": [{"title": "CISA ADP Vulnrichment", "metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2026-31666", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "total"}], "version": "2.0.3", "timestamp": "2026-10-16T15:11:52.641665Z"}}}], "problemTypes": [{"descriptions": [{"lang": "en", "type": "CWE", "cweId": "CWE-754", "description": "CWE-754 Improper Check for Unusual or Exceptional Conditions"}]}], "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-10-16T15:11:53.262Z"}}]}}

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However, when btrfs_next_leaf() returns 0\n(success), ret is overwritten from -ENOENT to 0. If the first key in\nthe next leaf does not match (different objectid or type), the function\nreturns 0 instead of -ENOENT, making the caller believe the lookup\nsucceeded when it did not. This can lead to operations on the wrong\nextent tree item, potentially causing extent tree corruption.\n\nFix this by returning -ENOENT directly when the key does not match,\ninstead of relying on the ret variable."}, {"lang": "es", "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nbtrfs: corrige el valor de retorno incorrecto despu\u00e9s de cambiar la hoja en lookup_extent_data_ref()\n\nDespu\u00e9s del commit 1618aa3c2e01 (\u2019btrfs: simplifica las variables de retorno en lookup_extent_data_ref()\u2019), las variables err y ret se fusionaron en una \u00fanica variable ret. Sin embargo, cuando btrfs_next_leaf() devuelve 0 (\u00e9xito), ret se sobrescribe de -ENOENT a 0. Si la primera clave en la siguiente hoja no coincide (diferente objectid o tipo), la funci\u00f3n devuelve 0 en lugar de -ENOENT, haciendo que el llamador crea que la b\u00fasqueda tuvo \u00e9xito cuando no fue as\u00ed. Esto puede llevar a operaciones en el elemento incorrecto del \u00e1rbol de extensiones, potencialmente causando corrupci\u00f3n del \u00e1rbol de extensiones.\n\nCorrige esto devolviendo -ENOENT directamente cuando la clave no coincide, en lugar de depender de la variable ret."}], "id": "CVE-2026-31666", "lastModified": "2026-11-11T23:10:00.263", "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"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-31666", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "total"}], "role": "CISA Coordinator", "timestamp": "2026-10-16T15:11:52.641665Z", "version": "2.0.3"}}]}, "published": "2026-04-24T15:16:46.290", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/316fb1b3169efb081d2db910cbbfef445afa03b9"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/4125a194db4a6cf91f619f38788272651cb97dce"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/450e6a685d0cad95b15f8af152057bd0bf79f50b"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/ab1e022379c3c811aa72da8eb0c7507859a1d0f5"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "NVD-CWE-noinfo"}], "source": "nvd@nist.gov", "type": "Primary"}, {"description": [{"lang": "en", "value": "CWE-754"}], "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary"}]}

{"bugzilla": {"description": "kernel: btrfs: fix incorrect return value after changing leaf in lookup_extent_data_ref()", "id": "2461485", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2461485"}, "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"}, "cwe": "CWE-393", "details": ["A flaw was found in the Linux kernel's btrfs filesystem. An incorrect return value in the `lookup_extent_data_ref()` function can lead to the system believing a lookup succeeded when it did not. This can cause operations to be performed on the wrong extent tree item, potentially resulting in data corruption within the extent tree."], "name": "CVE-2026-31666", "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": "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": "2026-04-24T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-31666\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-31666\nhttps://lore.kernel.org/linux-cve-announce/2026042405-CVE-2026-31666-f817@gregkh/T"], "threat_severity": "Moderate"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[1618aa3c2e0163f5ac34d514ae89474521910536,4125a194db4a6cf91f619f38788272651cb97dce)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[1618aa3c2e0163f5ac34d514ae89474521910536,450e6a685d0cad95b15f8af152057bd0bf79f50b)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[1618aa3c2e0163f5ac34d514ae89474521910536,ab1e022379c3c811aa72da8eb0c7507859a1d0f5)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[1618aa3c2e0163f5ac34d514ae89474521910536,316fb1b3169efb081d2db910cbbfef445afa03b9)"}}], "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": "6.10"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[0,6.10)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.12.82,6.13.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.18.23,6.19.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.19.13,6.20.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[7.0,*]"}}], "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": "2026-04-27T18:45:11.313137+00:00", "updated": "2026-10-19T21:30:03.914249+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}