CVE-2025-21726

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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."}], "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 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 \u2014 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 \u2014 `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()` \u2014 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."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["kernel/padata.c"], "versions": [{"version": "bbefa1dd6a6d53537c11624752219e39959d04fb", "lessThan": "f4f1b1169fc3694f9bc3e28c6c68dbbf4cc744c0", "status": "affected", "versionType": "git"}, {"version": "bbefa1dd6a6d53537c11624752219e39959d04fb", "lessThan": "4c6209efea2208597dbd3e52dc87a0d1a8f2dbe1", "status": "affected", "versionType": "git"}, {"version": "bbefa1dd6a6d53537c11624752219e39959d04fb", "lessThan": 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"semver"}, {"version": "5.5.3", "lessThan": "5.6", "status": "affected", "versionType": "semver"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["kernel/padata.c"], "versions": [{"version": "5.6", "status": "affected"}, {"version": "0", "lessThan": "5.6", "status": "unaffected", "versionType": "semver"}, {"version": "5.10.235", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver"}, {"version": "5.15.179", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.1.129", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.6.76", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.13", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.13.2", "lessThanOrEqual": "6.13.*", "status": 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"https://git.kernel.org/stable/c/a54091c24220a4cd847d5b4f36d678edacddbaf0"}, {"url": "https://git.kernel.org/stable/c/dd7d37ccf6b11f3d95e797ebe4e9e886d0332600"}], "title": "padata: avoid UAF for reorder_work", "x_generator": {"engine": "bippy-1.2.0"}}, "adp": [{"metrics": [{"cvssV3_1": {"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"}}, {"other": {"type": "ssvc", "content": {"id": "CVE-2025-21726", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "total"}], "version": "2.0.3", "timestamp": "2025-02-27T17:58:10.478288Z"}}}], "problemTypes": [{"descriptions": [{"lang": "en", "type": "CWE", "cweId": "CWE-416", "description": "CWE-416 Use 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subsystem", "versions": [{"status": "affected", "version": "0", "lessThan": "*", "versionType": "custom"}], "defaultStatus": "unknown"}], "references": [{"url": "https://cert-portal.siemens.com/productcert/html/ssa-265688.html"}, {"url": "https://cert-portal.siemens.com/productcert/html/ssa-784472.html"}]}]}}

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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 \u2014 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 \u2014 `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()` \u2014 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."}]}], "affected": [{"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "bbefa1dd6a6d53537c11624752219e39959d04fb", "lessThan": "f4f1b1169fc3694f9bc3e28c6c68dbbf4cc744c0", "versionType": "git"}, {"status": "affected", "version": "bbefa1dd6a6d53537c11624752219e39959d04fb", "lessThan": "4c6209efea2208597dbd3e52dc87a0d1a8f2dbe1", "versionType": "git"}, {"status": "affected", "version": "bbefa1dd6a6d53537c11624752219e39959d04fb", "lessThan": "7000507bb0d2ceb545c0a690e0c707c897d102c2", "versionType": "git"}, {"status": "affected", "version": "bbefa1dd6a6d53537c11624752219e39959d04fb", "lessThan": "6f45ef616775b0ce7889b0f6077fc8d681ab30bc", "versionType": "git"}, {"status": "affected", "version": "bbefa1dd6a6d53537c11624752219e39959d04fb", "lessThan": "8ca38d0ca8c3d30dd18d311f1a7ec5cb56972cac", "versionType": "git"}, {"status": "affected", "version": "bbefa1dd6a6d53537c11624752219e39959d04fb", "lessThan": "a54091c24220a4cd847d5b4f36d678edacddbaf0", "versionType": "git"}, {"status": "affected", "version": "bbefa1dd6a6d53537c11624752219e39959d04fb", "lessThan": "dd7d37ccf6b11f3d95e797ebe4e9e886d0332600", "versionType": "git"}, {"status": "affected", "version": "b4c8ed0bf977760a206997b6429a7ac91978f440", "versionType": "git"}, {"status": "affected", "version": "e43d65719527043f1ef79ecba9d4ede58cbc7ffe", "versionType": "git"}, {"status": "affected", "version": "5.4.19", "lessThan": "5.5", "versionType": "semver"}, {"status": "affected", "version": "5.5.3", "lessThan": "5.6", "versionType": "semver"}], "programFiles": ["kernel/padata.c"], "defaultStatus": "unaffected"}, {"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "5.6"}, {"status": "unaffected", "version": "0", "lessThan": "5.6", "versionType": "semver"}, {"status": "unaffected", "version": "5.10.235", "versionType": "semver", "lessThanOrEqual": "5.10.*"}, {"status": "unaffected", "version": "5.15.179", "versionType": "semver", "lessThanOrEqual": "5.15.*"}, {"status": "unaffected", "version": "6.1.129", "versionType": "semver", "lessThanOrEqual": "6.1.*"}, {"status": "unaffected", "version": "6.6.76", "versionType": "semver", "lessThanOrEqual": "6.6.*"}, {"status": "unaffected", "version": "6.12.13", "versionType": "semver", "lessThanOrEqual": "6.12.*"}, {"status": "unaffected", "version": "6.13.2", "versionType": "semver", "lessThanOrEqual": "6.13.*"}, {"status": "unaffected", "version": "6.14", "versionType": "original_commit_for_fix", "lessThanOrEqual": "*"}], "programFiles": ["kernel/padata.c"], "defaultStatus": "affected"}], "references": [{"url": "https://git.kernel.org/stable/c/f4f1b1169fc3694f9bc3e28c6c68dbbf4cc744c0"}, {"url": "https://git.kernel.org/stable/c/4c6209efea2208597dbd3e52dc87a0d1a8f2dbe1"}, {"url": "https://git.kernel.org/stable/c/7000507bb0d2ceb545c0a690e0c707c897d102c2"}, {"url": "https://git.kernel.org/stable/c/6f45ef616775b0ce7889b0f6077fc8d681ab30bc"}, {"url": "https://git.kernel.org/stable/c/8ca38d0ca8c3d30dd18d311f1a7ec5cb56972cac"}, {"url": "https://git.kernel.org/stable/c/a54091c24220a4cd847d5b4f36d678edacddbaf0"}, {"url": "https://git.kernel.org/stable/c/dd7d37ccf6b11f3d95e797ebe4e9e886d0332600"}], "x_generator": {"engine": "bippy-1.2.0"}, "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."}], "cpeApplicability": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "5.10.235", "versionStartIncluding": "5.6"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "5.15.179", "versionStartIncluding": "5.6"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.1.129", "versionStartIncluding": "5.6"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.6.76", "versionStartIncluding": "5.6"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.12.13", "versionStartIncluding": "5.6"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.13.2", "versionStartIncluding": "5.6"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.14", "versionStartIncluding": "5.6"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionStartIncluding": "5.4.19"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionStartIncluding": "5.5.3"}], "operator": "OR"}]}], "providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T11:53:59.161Z"}}}, "cveMetadata": {"cveId": "CVE-2025-21726", "state": "PUBLISHED", "dateUpdated": "2026-08-05T11:53:59.161Z", "dateReserved": "2024-12-29T08:45:45.754Z", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "datePublished": "2025-02-27T02:07:32.861Z", "assignerShortName": "Linux"}, "dataVersion": "5.2"}

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GNU/Linux subsystem", "vendor": "Siemens", "versions": [{"lessThan": "*", "status": "affected", "version": "0", "versionType": "custom"}]}, {"defaultStatus": "unknown", "product": "SIMATIC S7-1500 TM MFP - GNU/Linux subsystem", "vendor": "Siemens", "versions": [{"lessThan": "*", "status": "affected", "version": "0", "versionType": "custom"}]}], "source": "0b142b55-0307-4c5a-b3c9-f314f3fb7c5e"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "F8D27E1D-B88C-4DA9-AA0B-5EE142C053FB", "versionEndExcluding": "5.5", "versionStartIncluding": "5.4.19", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "788E7D29-360A-41BA-8805-31648EE009B3", "versionEndExcluding": "5.10.235", "versionStartIncluding": "5.5.3", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "39DC45D8-E30E-4F4A-9332-393B7BCF6900", "versionEndExcluding": "5.15.79", "versionStartIncluding": "5.11", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "2DA5009C-C9B9-4A1D-9B96-78427E8F232C", "versionEndExcluding": "6.1.129", "versionStartIncluding": "5.16", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "A6D70701-9CB6-4222-A957-00A419878993", "versionEndExcluding": "6.6.76", "versionStartIncluding": "6.2", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "2897389C-A8C3-4D69-90F2-E701B3D66373", "versionEndExcluding": "6.12.13", "versionStartIncluding": "6.7", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "6D4116B1-1BFD-4F23-BA84-169CC05FC5A3", "versionEndExcluding": "6.13.2", "versionStartIncluding": "6.13", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "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."}, {"lang": "es", "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: padata: avoid UAF for reorder_work Although the previous patch can avoid ps and ps UAF for _do_serial, it can not avoid potential UAF issue for reorder_work. This issue can happen just as below: crypto_request crypto_request crypto_del_alg padata_do_serial ... padata_reorder // processes all remaining // requests then breaks while (1) { if (!padata) break; ... } padata_do_serial // new request added list_add // sees the new request queue_work(reorder_work) padata_reorder queue_work_on(squeue-&gt;work) ... padata_serial_worker // completes new request, // no more outstanding // requests crypto_del_alg // free pd invoke_padata_reorder // UAF of pd To avoid UAF for 'reorder_work', get 'pd' ref before put 'reorder_work' into the 'serial_wq' and put 'pd' ref until the 'serial_wq' finish. "}], "id": "CVE-2025-21726", "lastModified": "2026-10-15T02:17:30.520", "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"}, {"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": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2025-21726", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "total"}], "role": "CISA Coordinator", "timestamp": "2025-02-27T17:58:10.478288Z", "version": "2.0.3"}}]}, "published": "2025-02-27T02:15:16.323", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/4c6209efea2208597dbd3e52dc87a0d1a8f2dbe1"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/6f45ef616775b0ce7889b0f6077fc8d681ab30bc"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/7000507bb0d2ceb545c0a690e0c707c897d102c2"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/8ca38d0ca8c3d30dd18d311f1a7ec5cb56972cac"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/a54091c24220a4cd847d5b4f36d678edacddbaf0"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/dd7d37ccf6b11f3d95e797ebe4e9e886d0332600"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/f4f1b1169fc3694f9bc3e28c6c68dbbf4cc744c0"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "url": "https://lists.debian.org/debian-lts-announce/2025/03/msg00028.html"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "url": "https://lists.debian.org/debian-lts-announce/2025/05/msg00030.html"}, {"source": "0b142b55-0307-4c5a-b3c9-f314f3fb7c5e", "url": "https://cert-portal.siemens.com/productcert/html/ssa-265688.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-416"}], "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary"}]}

{"bugzilla": {"description": "kernel: padata: avoid UAF for reorder_work", "id": "2348600", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2348600"}, "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-416", "details": ["In the Linux kernel, the following vulnerability has been resolved:\npadata: avoid UAF for reorder_work\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:\ncrypto_requestcrypto_requestcrypto_del_alg\npadata_do_serial\n...\npadata_reorder\n// processes all remaining\n// requests then breaks\nwhile (1) {\nif (!padata)\nbreak;\n...\n}\npadata_do_serial\n// new request added\nlist_add\n// sees the new request\nqueue_work(reorder_work)\npadata_reorder\nqueue_work_on(squeue->work)\n...\n<kworker context>\npadata_serial_worker\n// completes new request,\n// no more outstanding\n// requests\ncrypto_del_alg\n// free pd\n<kworker context>\ninvoke_padata_reorder\n// UAF of pd\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."], "mitigation": {"lang": "en:us", "value": "Mitigation for this issue is either not available or the currently available options don't meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability."}, "name": "CVE-2025-21726", "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": "Out of support scope", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Out of support scope", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Out of support scope", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Out of support scope", "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": "2025-02-27T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2025-21726\nhttps://nvd.nist.gov/vuln/detail/CVE-2025-21726\nhttps://lore.kernel.org/linux-cve-announce/2025022648-CVE-2025-21726-73b1@gregkh/T"], "statement": "There is no known way to trigger the bug. This is a purely theroretical concern, the problem has never been actually observed -- it would require multiple pcrypt request submissions racing against each other, ultimately a pcrypt instance destruction\n(DELALG) short after request completions as well as unfortunate timing. As result of this observation keeping impact level Moderate (based on that attack complexity is high).", "threat_severity": "Moderate"}

{}