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vuln-cve/data/2025/21xxx/CVE-2025-21726.json
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{
"dataType": "CVE_RECORD",
"dataVersion": "5.2",
"cveMetadata": {
"cveId": "CVE-2025-21726",
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"state": "PUBLISHED",
"assignerShortName": "Linux",
"dateReserved": "2024-12-29T08:45:45.754Z",
"datePublished": "2025-02-27T02:07:32.861Z",
"dateUpdated": "2026-10-15T01:03:46.766Z"
},
"containers": {
"cna": {
"providerMetadata": {
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux",
"dateUpdated": "2026-08-05T11:53:59.161Z"
},
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\npadata: avoid UAF for reorder_work\n\nAlthough the previous patch can avoid ps and ps UAF for _do_serial, it\ncan not avoid potential UAF issue for reorder_work. This issue can\nhappen just as below:\n\ncrypto_request\t\t\tcrypto_request\t\tcrypto_del_alg\npadata_do_serial\n ...\n padata_reorder\n // processes all remaining\n // requests then breaks\n while (1) {\n if (!padata)\n break;\n ...\n }\n\n\t\t\t\tpadata_do_serial\n\t\t\t\t // new request added\n\t\t\t\t list_add\n // sees the new request\n queue_work(reorder_work)\n\t\t\t\t padata_reorder\n\t\t\t\t queue_work_on(squeue->work)\n...\n\n\t\t\t\t<kworker context>\n\t\t\t\tpadata_serial_worker\n\t\t\t\t// completes new request,\n\t\t\t\t// no more outstanding\n\t\t\t\t// requests\n\n\t\t\t\t\t\t\tcrypto_del_alg\n\t\t\t\t\t\t\t // free pd\n\n<kworker context>\ninvoke_padata_reorder\n // UAF of pd\n\nTo avoid UAF for 'reorder_work', get 'pd' ref before put 'reorder_work'\ninto the 'serial_wq' and put 'pd' ref until the 'serial_wq' finish."
}
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"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"
},
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{
"lang": "en",
"value": "AV:L - The vulnerable padata reorder machinery is driven through pcrypt, reached locally via AF_ALG (`algif_aead`) socket operations or local xfrm/IPsec setup, and the `pd` free is triggered by local crypto-netlink/CPU-hotplug activity. No remote peer can reach or free the `parallel_data` object, so the attack requires local system access.\nAC:L - The attacker controls both sides of the race — they submit an unbounded stream of concurrent pcrypt AEAD requests to keep `reorder_work` queued while simultaneously driving the shell/pd teardown, and `serial_wq` is allocated with `max_active=1`, so `reorder_work` is routinely stalled behind serial workers, widening the window. Repeated attempts in a tight loop make the race reliably winnable, as the LTP `pcrypt_aead01` reproducer for the sibling bug demonstrates.\nPR:L - An unprivileged local user can fully drive the parallel/serial request side with no capability check at all via `AF_ALG` `algif_aead` binding `pcrypt(rfc4106(gcm(aes)))`, and the pd-release side is reachable through `padata_replace()` on CPU hotplug (suspend/resume, which logind grants to active unprivileged sessions) as well as through crypto netlink. No root-only gate is required on the path that actually corrupts memory.\nUI:N - The attacker issues both the crypto requests and the teardown that frees `parallel_data` themselves; no victim must mount a filesystem, open a file, or take any other action.\nS:U - The use-after-free corrupts kernel heap memory and is exploited within the same kernel security authority; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - After `pd` is freed and reclaimed by sprayed attacker data, `padata_reorder()` follows `pd->ps->pinst`, `pd->reorder_list`, `pd->squeue` and `pd->cpumask.pcpu` out of the freed object, giving an attacker-directed read primitive over arbitrary kernel memory and disclosure of kernel state.\nI:H - The same freed object yields write primitives — `spin_trylock_bh(&pd->lock)`, `refcount_inc(&pd->refcnt)`, `++pd->processed`, and especially `list_del_init()`/`list_add_tail()` through attacker-controlled `reorder_list`/`squeue` pointers, plus a controlled `workqueue_struct *` fed to `queue_work_on()` — which is exploitable for arbitrary write and control-flow hijack leading to privilege escalation.\nA:H - Even without successful heap grooming, dereferencing the freed `parallel_data` reliably produces a KASAN slab-use-after-free splat, spinlock corruption, and kernel oops/panic, taking the whole system down; the crash can be reproduced repeatedly."
}
]
}
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}
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