CVE-2026-46274

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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."}], "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 bug is reached only through io_uring syscalls (io_uring_setup/io_uring_enter) that enqueue and cancel async io-wq work; there is no network, adjacent-radio, or physical-device entry path to io_wq_remove_pending().\nAC:L - An attacker fully controls the trigger sequence\u2014queue a non-hashed async request, queue a hashed bucket-0 request behind it, cancel the hashed pending work, let the non-hashed work complete, then enqueue another hashed bucket-0 request\u2014with no dependence on uncontrollable timing or rare kernel configuration.\nPR:L - Any unprivileged local user who can invoke io_uring (default when kernel.io_uring_disabled=0) can drive the cancel/enqueue sequence; no real-root or special capability beyond normal local process access is required.\nUI:N - Exploitation requires only the attacker's own io_uring submissions and cancellations; no victim user action such as opening files or mounting filesystems is needed beyond what the attacker initiates.\nS:U - The flaw corrupts kernel heap memory within the same kernel security domain to escalate from local user to kernel privileges; it does not inherently cross a VM/host or IOMMU boundary on its own.\nC:H - The stale hash_tail pointer is a use-after-free of a freed io_kiocb slab object; subsequent dereferences in io_wq_insert_work() read freed memory and UAF heap corruption is routinely weaponizable for arbitrary kernel memory disclosure.\nI:H - io_wq_insert_work() calls wq_list_add_after(), which writes attacker-influenced list pointers through the freed io_kiocb's list.next field, providing a controlled heap write primitive suitable for further memory corruption or code execution.\nA:H - Dereferencing and writing through the dangling hash_tail pointer can cause kernel oops/panic from invalid slab access, and successful heap corruption can crash or hang the system even before full exploitation."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["io_uring/io-wq.c"], "versions": [{"version": "204361a77f4018627addd4a06877448f088ddfc0", "lessThan": "d6bda9df0c0a3080804181464d5c0f4d78a4e769", "status": "affected", "versionType": "git"}, {"version": "204361a77f4018627addd4a06877448f088ddfc0", "lessThan": "5a20ebf0c81b61f5ea3b1b529c100cad69b9f603", "status": "affected", "versionType": "git"}, {"version": "204361a77f4018627addd4a06877448f088ddfc0", "lessThan": "252c5051dba9c709b6a72f2866f93e5e618b3f06", "status": "affected", "versionType": "git"}, {"version": "204361a77f4018627addd4a06877448f088ddfc0", "lessThan": "d376c131af7c7739a87ff037ed2fdb67c2542c8a", "status": "affected", "versionType": "git"}, {"version": "204361a77f4018627addd4a06877448f088ddfc0", "lessThan": "d6a2d7b04b5a093021a7a0e2e69e9d5237dfa8cc", "status": "affected", "versionType": "git"}, {"version": "13f35a2c0fd5c6a4fcd8903542b053bcc914fcf5", "status": "affected", "versionType": "git"}, {"version": "5.8.6", "lessThan": "5.9", "status": "affected", "versionType": "semver"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["io_uring/io-wq.c"], "versions": [{"version": "5.9", "status": "affected"}, {"version": "0", "lessThan": "5.9", "status": "unaffected", "versionType": "semver"}, {"version": "6.6.141", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.91", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.33", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.0.10", "lessThanOrEqual": "7.0.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.1", "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": "5.9", "versionEndExcluding": "6.6.141"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.9", "versionEndExcluding": "6.12.91"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.9", "versionEndExcluding": "6.18.33"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.9", "versionEndExcluding": "7.0.10"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.9", "versionEndExcluding": "7.1"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.8.6"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/d6bda9df0c0a3080804181464d5c0f4d78a4e769"}, {"url": "https://git.kernel.org/stable/c/5a20ebf0c81b61f5ea3b1b529c100cad69b9f603"}, {"url": "https://git.kernel.org/stable/c/252c5051dba9c709b6a72f2866f93e5e618b3f06"}, {"url": "https://git.kernel.org/stable/c/d376c131af7c7739a87ff037ed2fdb67c2542c8a"}, {"url": "https://git.kernel.org/stable/c/d6a2d7b04b5a093021a7a0e2e69e9d5237dfa8cc"}], "title": "io-wq: check that the predecessor is hashed in io_wq_remove_pending()", "x_generator": {"engine": "bippy-1.2.0"}}}}

{}

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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[]."}], "id": "CVE-2026-46274", "lastModified": "2026-07-23T07:10:00.113", "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"}]}, "published": "2026-06-08T16:16:40.707", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/252c5051dba9c709b6a72f2866f93e5e618b3f06"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/5a20ebf0c81b61f5ea3b1b529c100cad69b9f603"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/d376c131af7c7739a87ff037ed2fdb67c2542c8a"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/d6a2d7b04b5a093021a7a0e2e69e9d5237dfa8cc"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/d6bda9df0c0a3080804181464d5c0f4d78a4e769"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-416"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: io-wq: check that the predecessor is hashed in io_wq_remove_pending()", "id": "2486404", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2486404"}, "csaw": false, "cvss3": {"cvss3_base_score": "7.8", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "status": "draft"}, "cwe": "CWE-825", "details": ["A flaw was found in the Linux kernel's input/output work queue (io-wq) component. This vulnerability occurs because the system incorrectly handles work queue entries, leading to a stale pointer. A local attacker could exploit this issue by manipulating work queue operations. Successful exploitation could allow the attacker to write to freed memory, potentially leading to privilege escalation or a system crash (denial of service)."], "name": "CVE-2026-46274", "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": "Not affected", "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": "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": "2026-06-08T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-46274\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-46274\nhttps://lore.kernel.org/linux-cve-announce/2026060803-CVE-2026-46274-b5c3@gregkh/T"], "threat_severity": "Moderate"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[204361a77f4018627addd4a06877448f088ddfc0,d6bda9df0c0a3080804181464d5c0f4d78a4e769)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[204361a77f4018627addd4a06877448f088ddfc0,5a20ebf0c81b61f5ea3b1b529c100cad69b9f603)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[204361a77f4018627addd4a06877448f088ddfc0,252c5051dba9c709b6a72f2866f93e5e618b3f06)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[204361a77f4018627addd4a06877448f088ddfc0,d376c131af7c7739a87ff037ed2fdb67c2542c8a)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[204361a77f4018627addd4a06877448f088ddfc0,d6a2d7b04b5a093021a7a0e2e69e9d5237dfa8cc)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "13f35a2c0fd5c6a4fcd8903542b053bcc914fcf5"}}, {"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "[5.8.6,5.9)"}}], "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": "5.9"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[0,5.9)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.6.141,6.7.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.12.91,6.13.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.18.33,6.19.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[7.0.10,7.1.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[7.1-rc4,*]"}}], "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": "2026-06-08T17:00:16.996002+00:00", "updated": "2026-08-13T22:30:05.257498+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}