CVE-2026-74671

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For a truncated xattr this underflows instead of going negative:\na 1-byte IMA_XATTR_DIGEST_NG xattr (xattr_len == 1, hash_start == 1)\nturns \"1 - 1 - 1\" into SIZE_MAX, which is trivially >= ima_hash->length.\nThe check then passes and the following memcmp() reads\niint->ima_hash->length bytes starting past the end of the buffer\nvfs_getxattr_alloc() allocated for it.\n\nNothing upstream clamps xattr_len back into a safe range first:\nima_get_hash_algo() only special-cases xattr_len < 2 to pick a default\nalgorithm, and evm_verifyxattr() returns INTEGRITY_UNKNOWN rather than\nfailing when no HMAC key is loaded, so a truncated security.ima value\nreaches the length check as-is.\n\nRewrite the comparison so every operand stays a signed int and no\nimplicit conversion to size_t can occur."}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["security/integrity/ima/ima_appraise.c"], "versions": [{"version": "3ea7a56067e663278470c04fd655adf809e72d4d", "lessThan": "d823b5f4557083d1dd92096f796a78a2b1b06d10", "status": "affected", "versionType": "git"}, {"version": "3ea7a56067e663278470c04fd655adf809e72d4d", "lessThan": "caeb105c15ea2431fa8da7ecfa242d0c68272426", "status": "affected", "versionType": "git"}, {"version": "3ea7a56067e663278470c04fd655adf809e72d4d", "lessThan": "a784b4732ac7e51862b9b210c2d8b2ab9e83568c", "status": "affected", "versionType": "git"}, {"version": "3ea7a56067e663278470c04fd655adf809e72d4d", "lessThan": "b6cb134707a2127d90a58d69dd818679cae8033c", "status": "affected", "versionType": "git"}, {"version": "3ea7a56067e663278470c04fd655adf809e72d4d", "lessThan": "7e515b6c9aab452a4f0734bd7208e4e780e164ca", "status": "affected", "versionType": "git"}, {"version": "3ea7a56067e663278470c04fd655adf809e72d4d", "lessThan": "27f3924061592d0ef6b04e16f48754b6cb6adf27", "status": "affected", "versionType": "git"}, {"version": "3ea7a56067e663278470c04fd655adf809e72d4d", "lessThan": "dd04114af0d451091f7b8cbd26d9e37d011e9131", "status": "affected", "versionType": "git"}, {"version": "3ea7a56067e663278470c04fd655adf809e72d4d", "lessThan": "5ff232d31106f45ac87c3b64e1d35a0667777797", "status": "affected", "versionType": "git"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["security/integrity/ima/ima_appraise.c"], "versions": [{"version": "3.13", "status": "affected"}, {"version": "0", "lessThan": "3.13", "status": "unaffected", "versionType": "semver"}, {"version": "5.10.265", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver"}, {"version": "5.15.216", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.1.183", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.6.152", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.104", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.45", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.1.9", "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": "3.13", "versionEndExcluding": "5.10.265"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.13", "versionEndExcluding": "5.15.216"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.13", 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"https://git.kernel.org/stable/c/a784b4732ac7e51862b9b210c2d8b2ab9e83568c"}, {"url": "https://git.kernel.org/stable/c/b6cb134707a2127d90a58d69dd818679cae8033c"}, {"url": "https://git.kernel.org/stable/c/7e515b6c9aab452a4f0734bd7208e4e780e164ca"}, {"url": "https://git.kernel.org/stable/c/27f3924061592d0ef6b04e16f48754b6cb6adf27"}, {"url": "https://git.kernel.org/stable/c/dd04114af0d451091f7b8cbd26d9e37d011e9131"}, {"url": "https://git.kernel.org/stable/c/5ff232d31106f45ac87c3b64e1d35a0667777797"}], "title": "ima: fix out-of-bounds read in xattr_verify()", "x_generator": {"engine": "bippy-1.2.0"}}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2026-74671", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "partial"}], "version": "2.0.3", "timestamp": "2026-11-06T17:00:47.782346Z"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": 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For a truncated xattr this underflows instead of going negative:\na 1-byte IMA_XATTR_DIGEST_NG xattr (xattr_len == 1, hash_start == 1)\nturns \"1 - 1 - 1\" into SIZE_MAX, which is trivially >= ima_hash->length.\nThe check then passes and the following memcmp() reads\niint->ima_hash->length bytes starting past the end of the buffer\nvfs_getxattr_alloc() allocated for it.\n\nNothing upstream clamps xattr_len back into a safe range first:\nima_get_hash_algo() only special-cases xattr_len < 2 to pick a default\nalgorithm, and evm_verifyxattr() returns INTEGRITY_UNKNOWN rather than\nfailing when no HMAC key is loaded, so a truncated security.ima value\nreaches the length check as-is.\n\nRewrite the comparison so every operand stays a signed int and no\nimplicit conversion to size_t can occur."}], "cpeApplicability": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "5.10.265", "versionStartIncluding": "3.13"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "5.15.216", "versionStartIncluding": "3.13"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.1.183", "versionStartIncluding": "3.13"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.6.152", "versionStartIncluding": "3.13"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.12.104", "versionStartIncluding": "3.13"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.18.45", "versionStartIncluding": "3.13"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "7.1.9", "versionStartIncluding": "3.13"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "7.2", "versionStartIncluding": "3.13"}], "operator": "OR"}]}], "providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-22T15:32:41.480Z"}}}, "cveMetadata": {"cveId": "CVE-2026-74671", "state": "PUBLISHED", "dateUpdated": "2026-11-06T17:05:50.462Z", "dateReserved": "2026-08-15T05:44:03.925Z", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "datePublished": "2026-08-22T15:32:41.480Z", "assignerShortName": "Linux"}, "dataVersion": "5.2"}

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For a truncated xattr this underflows instead of going negative:\na 1-byte IMA_XATTR_DIGEST_NG xattr (xattr_len == 1, hash_start == 1)\nturns \"1 - 1 - 1\" into SIZE_MAX, which is trivially >= ima_hash->length.\nThe check then passes and the following memcmp() reads\niint->ima_hash->length bytes starting past the end of the buffer\nvfs_getxattr_alloc() allocated for it.\n\nNothing upstream clamps xattr_len back into a safe range first:\nima_get_hash_algo() only special-cases xattr_len < 2 to pick a default\nalgorithm, and evm_verifyxattr() returns INTEGRITY_UNKNOWN rather than\nfailing when no HMAC key is loaded, so a truncated security.ima value\nreaches the length check as-is.\n\nRewrite the comparison so every operand stays a signed int and no\nimplicit conversion to size_t can occur."}, {"lang": "es", "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nima: soluci\u00f3n a lectura fuera de l\u00edmites en xattr_verify()\n\nLa comprobaci\u00f3n de la longitud del digest en xattr_verify() mezcla int y size_t:\n\n\tif (xattr_len - sizeof(xattr_value -> type) - hash_start >=\n\t\t\tiint -> ima_hash -> length)\n\nsizeof() produce size_t, por lo que las conversiones aritm\u00e9ticas habituales promueven todo el lado izquierdo a unsigned de 64 bits antes de que se ejecute la resta. Para un xattr truncado, esto provoca un desbordamiento negativo (underflow) en lugar de volverse negativo: un xattr IMA_XATTR_DIGEST_NG de 1 byte (xattr_len == 1, hash_start == 1) convierte '1 - 1 - 1' en SIZE_MAX, lo cual es trivialmente >= ima_hash -> length. La comprobaci\u00f3n entonces pasa y el siguiente memcmp() lee iint -> ima_hash -> length bytes comenzando m\u00e1s all\u00e1 del final del b\u00fafer que vfs_getxattr_alloc() asign\u00f3 para ello.\n\nNada en la cadena de desarrollo (upstream) restringe xattr_len a un rango seguro primero: ima_get_hash_algo() solo trata de forma especial los casos donde xattr_len < 2 para seleccionar un algoritmo predeterminado, y evm_verifyxattr() devuelve INTEGRITY_UNKNOWN en lugar de fallar cuando no se carga ninguna clave HMAC, por lo que un valor security.ima truncado llega a la comprobaci\u00f3n de longitud tal cual.\n\nReescribir la comparaci\u00f3n para que cada operando permanezca como un int con signo y no pueda ocurrir ninguna conversi\u00f3n impl\u00edcita a size_t."}], "id": "CVE-2026-74671", "lastModified": "2026-11-06T17:19:53.383", "metrics": {"ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-74671", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-11-06T17:00:47.782346Z", "version": "2.0.3"}}]}, "published": "2026-08-22T16:16:41.063", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/27f3924061592d0ef6b04e16f48754b6cb6adf27"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/5ff232d31106f45ac87c3b64e1d35a0667777797"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/7e515b6c9aab452a4f0734bd7208e4e780e164ca"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/a784b4732ac7e51862b9b210c2d8b2ab9e83568c"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/b6cb134707a2127d90a58d69dd818679cae8033c"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/caeb105c15ea2431fa8da7ecfa242d0c68272426"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/d823b5f4557083d1dd92096f796a78a2b1b06d10"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/dd04114af0d451091f7b8cbd26d9e37d011e9131"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Received"}

{"bugzilla": {"description": "kernel: ima: fix out-of-bounds read in xattr_verify()", "id": "2521397", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2521397"}, "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-125", "details": ["A flaw was found in the Linux kernel's Integrity Measurement Architecture (IMA) subsystem. The `xattr_verify()` function, which verifies extended attributes, incorrectly mixes `int` and `size_t` data types in its digest-length check. This can lead to an integer underflow when processing a truncated extended attribute, bypassing a bounds check. As a result, a memory comparison operation reads beyond the allocated buffer, causing an out-of-bounds read that could lead to information disclosure or system instability."], "name": "CVE-2026-74671", "public_date": "2026-08-22T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-74671\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-74671\nhttps://lore.kernel.org/linux-cve-announce/2026082229-CVE-2026-74671-bdc4@gregkh/T"], "threat_severity": "Moderate"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[3ea7a56067e663278470c04fd655adf809e72d4d,d823b5f4557083d1dd92096f796a78a2b1b06d10)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[3ea7a56067e663278470c04fd655adf809e72d4d,caeb105c15ea2431fa8da7ecfa242d0c68272426)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[3ea7a56067e663278470c04fd655adf809e72d4d,a784b4732ac7e51862b9b210c2d8b2ab9e83568c)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[3ea7a56067e663278470c04fd655adf809e72d4d,b6cb134707a2127d90a58d69dd818679cae8033c)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[3ea7a56067e663278470c04fd655adf809e72d4d,7e515b6c9aab452a4f0734bd7208e4e780e164ca)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[3ea7a56067e663278470c04fd655adf809e72d4d,27f3924061592d0ef6b04e16f48754b6cb6adf27)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[3ea7a56067e663278470c04fd655adf809e72d4d,dd04114af0d451091f7b8cbd26d9e37d011e9131)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[3ea7a56067e663278470c04fd655adf809e72d4d,5ff232d31106f45ac87c3b64e1d35a0667777797)"}}], "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": "3.13"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[0,3.13)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[5.10.265,5.10.*]"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[5.15.216,5.15.*]"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.1.183,6.1.*]"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.6.152,6.6.*]"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.12.104,6.12.*]"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.18.45,6.18.*]"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[7.1.9,7.1.*]"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[7.2,*]"}}], "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": "2026-08-22T18:30:16.838826+00:00", "updated": "2026-08-24T20:00:04.405753+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}