CVE-2026-46274

{"id": "CVE-2026-46274", "cveTags": [], "metrics": {"cvssMetricV31": [{"type": "Secondary", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "cvssData": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 7.8, "attackVector": "LOCAL", "baseSeverity": "HIGH", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "integrityImpact": "HIGH", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "LOW", "confidentialityImpact": "HIGH"}, "impactScore": 5.9, "exploitabilityScore": 1.8}]}, "affected": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "affectedData": [{"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "204361a77f4018627addd4a06877448f088ddfc0", "lessThan": "d6bda9df0c0a3080804181464d5c0f4d78a4e769", "versionType": "git"}, {"status": "affected", "version": "204361a77f4018627addd4a06877448f088ddfc0", "lessThan": "5a20ebf0c81b61f5ea3b1b529c100cad69b9f603", "versionType": "git"}, {"status": "affected", "version": "204361a77f4018627addd4a06877448f088ddfc0", "lessThan": "252c5051dba9c709b6a72f2866f93e5e618b3f06", "versionType": "git"}, {"status": "affected", "version": "204361a77f4018627addd4a06877448f088ddfc0", "lessThan": "d376c131af7c7739a87ff037ed2fdb67c2542c8a", "versionType": "git"}, {"status": "affected", "version": "204361a77f4018627addd4a06877448f088ddfc0", "lessThan": "d6a2d7b04b5a093021a7a0e2e69e9d5237dfa8cc", "versionType": "git"}, {"status": "affected", "version": "13f35a2c0fd5c6a4fcd8903542b053bcc914fcf5", "versionType": "git"}, {"status": "affected", "version": "5.8.6", "lessThan": "5.9", "versionType": "semver"}], "programFiles": ["io_uring/io-wq.c"], "defaultStatus": "unaffected"}, {"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "5.9"}, {"status": "unaffected", "version": "0", "lessThan": "5.9", "versionType": "semver"}, {"status": "unaffected", "version": "6.6.141", "versionType": "semver", "lessThanOrEqual": "6.6.*"}, {"status": "unaffected", "version": "6.12.91", "versionType": "semver", "lessThanOrEqual": "6.12.*"}, {"status": "unaffected", "version": "6.18.33", "versionType": "semver", "lessThanOrEqual": "6.18.*"}, {"status": "unaffected", "version": "7.0.10", "versionType": "semver", "lessThanOrEqual": "7.0.*"}, {"status": "unaffected", "version": "7.1", "versionType": "original_commit_for_fix", "lessThanOrEqual": "*"}], "programFiles": ["io_uring/io-wq.c"], "defaultStatus": "affected"}]}], "published": "2026-06-08T16:16:40.707", "references": [{"url": "https://git.kernel.org/stable/c/252c5051dba9c709b6a72f2866f93e5e618b3f06", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/5a20ebf0c81b61f5ea3b1b529c100cad69b9f603", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/d376c131af7c7739a87ff037ed2fdb67c2542c8a", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/d6a2d7b04b5a093021a7a0e2e69e9d5237dfa8cc", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/d6bda9df0c0a3080804181464d5c0f4d78a4e769", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "vulnStatus": "Analyzed", "weaknesses": [{"type": "Primary", "source": "nvd@nist.gov", "description": [{"lang": "en", "value": "CWE-416"}]}], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nio-wq: check that the predecessor is hashed in io_wq_remove_pending()\n\nio_wq_remove_pending() needs to fix up wq->hash_tail[] if the cancelled\nwork was the tail of its hash bucket. When doing this, it checks whether\nthe preceding entry in acct->work_list has the same hash value, but\nnever checks that the predecessor is hashed at all. io_get_work_hash()\nis simply atomic_read(&work->flags) >> IO_WQ_HASH_SHIFT, and the hash\nbits are never set for non-hashed work, so it returns 0. Thus, when a\nhashed bucket-0 work is cancelled while a non-hashed work is its list\npredecessor, the check spuriously passes and a pointer to the non-hashed\nio_kiocb is stored in wq->hash_tail[0].\n\nBecause non-hashed work is dequeued via the fast path in\nio_get_next_work(), which never touches hash_tail[], the stale pointer\nis never cleared. Therefore, after the non-hashed io_kiocb completes and\nis freed back to req_cachep, wq->hash_tail[0] is a dangling pointer. The\nio_wq is per-task (tctx->io_wq) and survives ring open/close, so the\ndangling pointer persists for the lifetime of the task; the next hashed\nbucket-0 enqueue dereferences it in io_wq_insert_work() and\nwq_list_add_after() writes through freed memory.\n\nAdd the missing io_wq_is_hashed() check so a non-hashed predecessor\nnever inherits a hash_tail[] slot."}, {"lang": "es", "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nio-wq: verificar que el predecesor est\u00e9 hasheado en io_wq_remove_pending()\n\nio_wq_remove_pending() necesita corregir wq->hash_tail[] si el trabajo cancelado era la cola de su cubo hash. Al hacer esto, verifica si la entrada precedente en acct->work_list tiene el mismo valor hash, pero nunca verifica que el predecesor est\u00e9 hasheado en absoluto. io_get_work_hash() es simplemente atomic_read(&work->flags) >> IO_WQ_HASH_SHIFT, y los bits hash nunca se establecen para trabajos no hasheados, por lo que devuelve 0. As\u00ed, cuando un trabajo hasheado del cubo 0 es cancelado mientras que un trabajo no hasheado es su predecesor en la lista, la verificaci\u00f3n pasa de forma espuria y un puntero al io_kiocb no hasheado se almacena en wq->hash_tail[0].\n\nDebido a que el trabajo no hasheado se desencola a trav\u00e9s de la ruta r\u00e1pida en io_get_next_work(), que nunca toca hash_tail[], el puntero obsoleto nunca se borra. Por lo tanto, despu\u00e9s de que el io_kiocb no hasheado se completa y se libera de nuevo a req_cachep, wq->hash_tail[0] es un puntero colgante. El io_wq es por tarea (tctx->io_wq) y sobrevive a la apertura/cierre del anillo, por lo que el puntero colgante persiste durante la vida \u00fatil de la tarea; la siguiente encolaci\u00f3n hasheada del cubo 0 lo desreferencia en io_wq_insert_work() y wq_list_add_after() escribe a trav\u00e9s de memoria liberada.\n\nA\u00f1adir la verificaci\u00f3n io_wq_is_hashed() faltante para que un predecesor no hasheado nunca herede una ranura hash_tail[]."}], "lastModified": "2026-07-23T07:10:00.113", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "D1A2FB6C-A45E-4E1B-8FE3-D0CDD7BE36C3", "versionEndExcluding": "5.9", "versionStartIncluding": "5.8.6"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "971F5EF2-3F57-4AF7-8366-2D4437ABE0FC", "versionEndExcluding": "6.6.141", "versionStartIncluding": "5.9.1"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "C918746B-DE6F-448F-A93E-A04C5481688D", "versionEndExcluding": "6.12.91", "versionStartIncluding": "6.7"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "96D99E49-380D-43AB-BDBA-25C3AD018A9C", "versionEndExcluding": "6.18.33", "versionStartIncluding": "6.13"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "A13475D2-59BF-4716-94B5-7C1D239A2CF4", "versionEndExcluding": "7.0.10", "versionStartIncluding": "6.19"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:5.9:-:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "F79A2EB6-623E-4749-AEE0-DCB58C4C42F8"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:5.9:rc3:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "A52A4ABE-5C24-4CD4-A348-E303B7F23C71"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:5.9:rc4:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "12019CF2-FD8E-4D59-BA4C-7093DF0BB091"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:5.9:rc5:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "9B1AB90E-C0C6-4027-B27D-BA214BE33561"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:5.9:rc6:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "103FE5BA-7315-4263-9C95-EABEAD7E174F"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:5.9:rc7:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "47E31D6A-31EC-4F63-9CAE-B7A52B58E149"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:5.9:rc8:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "3497462B-A3DA-47CC-A5DD-C1C2D2E6DFDE"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:7.1:rc1:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "B1EF7059-E670-45F4-B422-54C40FA86390"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:7.1:rc2:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "0D38F0BF-A728-4133-A358-D44A2F7EE6D6"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:7.1:rc3:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "EC732D08-5F7B-46D9-B154-E60C7F4F0A97"}], "operator": "OR"}]}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}