CVE-2026-31449

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Before\naccessing path[k].p_idx->ei_block, there is no validation that\np_idx falls within the valid range of index entries for that\nlevel.\n\nIf the on-disk extent header contains a corrupted or crafted\neh_entries value, p_idx can point past the end of the allocated\nbuffer, causing a slab-out-of-bounds read.\n\nFix this by validating path[k].p_idx against EXT_LAST_INDEX() at\nboth access sites: before the while loop and inside it. Return\n-EFSCORRUPTED if the index pointer is out of range, consistent\nwith how other bounds violations are handled in the ext4 extent\ntree code."}], "metrics": [{"cvssV3_1": {"version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H", "baseScore": 7.8, "baseSeverity": "HIGH"}, "scenarios": [{"lang": "en", "value": "AV:L - The vulnerable ext4 code is reached through local filesystem operations such as pwrite64, fallocate, or truncate on a mounted ext4 filesystem. It is not directly reachable through network packets, and physical access is not strictly required because a crafted filesystem image can be supplied as a local/block-device image.\nAC:L - Once the crafted/corrupted extent metadata is present on a mounted filesystem, the trigger is a straightforward file write or extent update with no race or condition outside the attacker's control. Syzbot reproduced it through the ordinary buffered-write path.\nPR:N - In the highest-severity defensible scenario, the attacker supplies a malicious ext4 image and relies on a victim/admin or automount workflow to mount it, so the attacker needs no privileges on the target. Ext4 is not user-namespace mountable, but that mount requirement is captured as user interaction rather than attacker privileges.\nUI:R - Exploitation requires the crafted ext4 filesystem to be mounted and then operated on, such as by writing to the crafted file. There is no pre-authentication or autonomous network-facing path into this code.\nS:U - The impact is within the kernel/filesystem security authority of the same host. This is not a guest-to-host escape or another cross-scope boundary violation.\nC:H - The bug is a slab out-of-bounds access from an attacker-controlled extent-tree pointer, which can expose adjacent kernel memory in a corrupted heap layout. Under the required overestimation rule, this memory-corruption primitive supports high confidentiality impact.\nI:H - The unchecked p_idx is used to update ei_block, so an out-of-bounds pointer can corrupt memory or filesystem metadata beyond the valid extent index entry. Such kernel memory corruption is defensibly treated as high integrity impact.\nA:H - The reported failure is a KASAN slab-out-of-bounds fault in kernel ext4 code and can cause an oops/panic or filesystem failure. Repeated triggering through file operations can deny availability of the host or mounted filesystem."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["fs/ext4/extents.c"], "versions": [{"version": "a86c61812637c7dd0c57e29880cffd477b62f2e7", "lessThan": "39d6e2b67651614bac0dc6592fa9836321910067", "status": "affected", "versionType": "git"}, {"version": "a86c61812637c7dd0c57e29880cffd477b62f2e7", "lessThan": "c5839b34704c9c2f47f079451bdbb22de0da1ed1", "status": "affected", "versionType": "git"}, {"version": "a86c61812637c7dd0c57e29880cffd477b62f2e7", "lessThan": "10242e640b36b91ad03d25f3dc77854bbdff8358", "status": "affected", "versionType": "git"}, {"version": "a86c61812637c7dd0c57e29880cffd477b62f2e7", "lessThan": "4d08401aa13f1531216f1a7ae281ca4806e90a5c", "status": "affected", "versionType": "git"}, {"version": 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"5.10.*", "status": "unaffected", "versionType": "semver"}, {"version": "5.15.210", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.1.175", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.6.140", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.80", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.21", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.19.11", "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": "2.6.19", 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"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.19", "versionEndExcluding": "7.0"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/39d6e2b67651614bac0dc6592fa9836321910067"}, {"url": "https://git.kernel.org/stable/c/c5839b34704c9c2f47f079451bdbb22de0da1ed1"}, {"url": "https://git.kernel.org/stable/c/10242e640b36b91ad03d25f3dc77854bbdff8358"}, {"url": "https://git.kernel.org/stable/c/4d08401aa13f1531216f1a7ae281ca4806e90a5c"}, {"url": "https://git.kernel.org/stable/c/407c944f217c17d4343148011acafebc604d55e1"}, {"url": "https://git.kernel.org/stable/c/93f2e975ed658ce09db4d4c2877ca2c06540df83"}, {"url": "https://git.kernel.org/stable/c/01bf1e0b997d82c0e353b51ed74ef99698043c33"}, {"url": "https://git.kernel.org/stable/c/2acb5c12ebd860f30e4faf67e6cc8c44ddfe5fe8"}], "title": "ext4: validate p_idx bounds in ext4_ext_correct_indexes", "x_generator": {"engine": "bippy-1.2.0"}}, "adp": [{"x_adpType": "supplier", "providerMetadata": {"orgId": 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It is not directly reachable through network packets, and physical access is not strictly required because a crafted filesystem image can be supplied as a local/block-device image.\nAC:L - Once the crafted/corrupted extent metadata is present on a mounted filesystem, the trigger is a straightforward file write or extent update with no race or condition outside the attacker's control. Syzbot reproduced it through the ordinary buffered-write path.\nPR:N - In the highest-severity defensible scenario, the attacker supplies a malicious ext4 image and relies on a victim/admin or automount workflow to mount it, so the attacker needs no privileges on the target. Ext4 is not user-namespace mountable, but that mount requirement is captured as user interaction rather than attacker privileges.\nUI:R - Exploitation requires the crafted ext4 filesystem to be mounted and then operated on, such as by writing to the crafted file. There is no pre-authentication or autonomous network-facing path into this code.\nS:U - The impact is within the kernel/filesystem security authority of the same host. This is not a guest-to-host escape or another cross-scope boundary violation.\nC:H - The bug is a slab out-of-bounds access from an attacker-controlled extent-tree pointer, which can expose adjacent kernel memory in a corrupted heap layout. Under the required overestimation rule, this memory-corruption primitive supports high confidentiality impact.\nI:H - The unchecked p_idx is used to update ei_block, so an out-of-bounds pointer can corrupt memory or filesystem metadata beyond the valid extent index entry. Such kernel memory corruption is defensibly treated as high integrity impact.\nA:H - The reported failure is a KASAN slab-out-of-bounds fault in kernel ext4 code and can cause an oops/panic or filesystem failure. 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Before\naccessing path[k].p_idx->ei_block, there is no validation that\np_idx falls within the valid range of index entries for that\nlevel.\n\nIf the on-disk extent header contains a corrupted or crafted\neh_entries value, p_idx can point past the end of the allocated\nbuffer, causing a slab-out-of-bounds read.\n\nFix this by validating path[k].p_idx against EXT_LAST_INDEX() at\nboth access sites: before the while loop and inside it. 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Before\naccessing path[k].p_idx->ei_block, there is no validation that\np_idx falls within the valid range of index entries for that\nlevel.\n\nIf the on-disk extent header contains a corrupted or crafted\neh_entries value, p_idx can point past the end of the allocated\nbuffer, causing a slab-out-of-bounds read.\n\nFix this by validating path[k].p_idx against EXT_LAST_INDEX() at\nboth access sites: before the while loop and inside it. Return\n-EFSCORRUPTED if the index pointer is out of range, consistent\nwith how other bounds violations are handled in the ext4 extent\ntree code."}, {"lang": "es", "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\next4: validar los l\u00edmites de p_idx en ext4_ext_correct_indexes\n\next4_ext_correct_indexes() recorre el \u00e1rbol de extensiones corrigiendo las entradas de \u00edndice cuando se modifica la primera extensi\u00f3n en una hoja. Antes de acceder a path[k].p_idx -> ei_block, no hay validaci\u00f3n de que p_idx caiga dentro del rango v\u00e1lido de entradas de \u00edndice para ese nivel.\n\nSi el encabezado de extensi\u00f3n en disco contiene un valor eh_entries corrupto o manipulado, p_idx puede apuntar m\u00e1s all\u00e1 del final del b\u00fafer asignado, causando una lectura fuera de l\u00edmites de slab.\n\nEsto se soluciona validando path[k].p_idx contra EXT_LAST_INDEX() en ambos sitios de acceso: antes del bucle while y dentro de \u00e9l. Devolver -EFSCORRUPTED si el puntero de \u00edndice est\u00e1 fuera de rango, consistente con c\u00f3mo se manejan otras violaciones de l\u00edmites en el c\u00f3digo del \u00e1rbol de extensiones ext4."}], "id": "CVE-2026-31449", "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": "NONE", "scope": "UNCHANGED", "userInteraction": "REQUIRED", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/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-2026-31449", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "total"}], "role": "CISA Coordinator", "timestamp": "2026-10-16T15:09:29.200842Z", "version": "2.0.3"}}]}, "published": "2026-04-22T14:16:38.933", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/01bf1e0b997d82c0e353b51ed74ef99698043c33"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/10242e640b36b91ad03d25f3dc77854bbdff8358"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/2acb5c12ebd860f30e4faf67e6cc8c44ddfe5fe8"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/39d6e2b67651614bac0dc6592fa9836321910067"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/407c944f217c17d4343148011acafebc604d55e1"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/4d08401aa13f1531216f1a7ae281ca4806e90a5c"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/93f2e975ed658ce09db4d4c2877ca2c06540df83"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/c5839b34704c9c2f47f079451bdbb22de0da1ed1"}, {"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-457936.html"}, {"source": "0b142b55-0307-4c5a-b3c9-f314f3fb7c5e", "url": "https://cert-portal.siemens.com/productcert/html/ssa-784472.html"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-125"}], "source": "nvd@nist.gov", "type": "Primary"}, {"description": [{"lang": "en", "value": "CWE-125"}], "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary"}]}

{"bugzilla": {"description": "kernel: ext4: validate p_idx bounds in ext4_ext_correct_indexes", "id": "2460717", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2460717"}, "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-1285", "details": ["A flaw was found in the Linux kernel's ext4 filesystem. A local attacker could exploit this vulnerability by providing a specially crafted or corrupted on-disk extent header. This could cause an out-of-bounds read in memory, potentially leading to information disclosure or a system crash (Denial of Service)."], "name": "CVE-2026-31449", "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": "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": "2026-04-22T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-31449\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-31449\nhttps://lore.kernel.org/linux-cve-announce/2026042247-CVE-2026-31449-0942@gregkh/T"], "threat_severity": "Moderate"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[1da177e4c3f41524e886b7f1b8a0c1fc7321cac2,407c944f217c17d4343148011acafebc604d55e1)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[1da177e4c3f41524e886b7f1b8a0c1fc7321cac2,93f2e975ed658ce09db4d4c2877ca2c06540df83)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[1da177e4c3f41524e886b7f1b8a0c1fc7321cac2,01bf1e0b997d82c0e353b51ed74ef99698043c33)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[1da177e4c3f41524e886b7f1b8a0c1fc7321cac2,2acb5c12ebd860f30e4faf67e6cc8c44ddfe5fe8)"}}], "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": "unaffected", "versions": {"scheme": "semver", "value": "[6.12.80,6.13.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.18.21,6.19.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.19.11,6.20.0)"}}, {"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": "2026-04-22T16:30:21.825449+00:00", "updated": "2026-05-07T20:00:12.058877+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}