CVE-2026-43402

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The crash was traced back to the pidfs rhashtable\nconversion which replaced the 24-byte rb_node with an 8-byte rhash_head\nin struct pid, shrinking it from 160 to 144 bytes.\n\nstruct kthread (without CONFIG_BLK_CGROUP) is also 144 bytes. With\nCONFIG_SLAB_MERGE_DEFAULT and SLAB_HWCACHE_ALIGN both round up to\n192 bytes and share the same slab cache. struct pid.rcu.func and\nstruct kthread.affinity_node both sit at offset 0x78.\n\nWhen a kthread exits via make_task_dead() it bypasses kthread_exit() and\nmisses the affinity_node cleanup. free_kthread_struct() frees the memory\nwhile the node is still linked into the global kthread_affinity_list. A\nsubsequent list_del() by another kthread writes through dangling list\npointers into the freed and reused memory, corrupting the pid's\nrcu.func pointer.\n\nInstead of patching free_kthread_struct() to handle the missed cleanup,\nconsolidate all kthread exit paths. Turn kthread_exit() into a macro\nthat calls do_exit() and add kthread_do_exit() which is called from\ndo_exit() for any task with PF_KTHREAD set. This guarantees that\nkthread-specific cleanup always happens regardless of the exit path -\nmake_task_dead(), direct do_exit(), or kthread_exit().\n\nReplace __to_kthread() with a new tsk_is_kthread() accessor in the\npublic header. Export do_exit() since module code using the\nkthread_exit() macro now needs it directly."}], "metrics": [{"cvssV3_1": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "baseScore": 9.8, "baseSeverity": "CRITICAL"}, "scenarios": [{"lang": "en", "value": "AV:N - In the most severe reasonable deployment, network-facing in-kernel services such as ksmbd create kthreads and process unauthenticated remote traffic in those kthreads. The vulnerable kthread lifecycle and exit cleanup can therefore be reached from a remote network path.\nAC:L - The bug is a deterministic cleanup omission once an affected kthread exits through a bypass path such as make_task_dead/do_exit, and the resulting dangling list entry can be exercised by normal kthread churn. There is no attacker-uncontrolled race required for the UAF mechanism itself.\nPR:N - For network-facing kthread users such as ksmbd connection handlers, an unauthenticated remote peer can drive pre-authentication packet handling and connection-thread creation. No local account or kernel capability is required in that scenario.\nUI:N - Exploitation does not require a victim user to open a file, mount a filesystem, or perform another interactive action. The attacker can send traffic or otherwise drive the reachable service path directly.\nS:U - The corruption occurs within the Linux kernel and impacts kernel-managed memory and control flow. It does not inherently cross a separate security authority such as a VM-to-host or IOMMU boundary.\nC:H - This is a use-after-free of a freed struct kthread left linked into a global list, with later list operations writing into reused slab memory such as struct pid. Kernel UAF memory corruption is treated as capable of yielding high confidentiality impact through read/info-disclosure primitives.\nI:H - The stale list entry causes writes through dangling list pointers into a reused object, including corruption of sensitive fields such as an RCU callback pointer. Such kernel UAF corruption is defensibly exploitable for arbitrary write or control-flow hijack.\nA:H - The observed failure mode is corrupted RCU callback function pointers and kernel crashes. Even without full exploitation, repeated triggering can oops or panic the kernel, causing high availability impact."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["include/linux/kthread.h", "kernel/exit.c", "kernel/kthread.c"], "versions": [{"version": "4d13f4304fa43471bfea101658a11feec7b28ac0", "lessThan": "4729c7b00a347fd37d0cbc265b85f2884c3e06b6", "status": "affected", "versionType": "git"}, {"version": "4d13f4304fa43471bfea101658a11feec7b28ac0", "lessThan": "5a591d7a5e48d30100943940a30a6ab41b15c672", "status": "affected", "versionType": "git"}, {"version": "4d13f4304fa43471bfea101658a11feec7b28ac0", "lessThan": "28aaa9c39945b7925a1cc1d513c8f21ed38f5e4f", "status": "affected", "versionType": "git"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["include/linux/kthread.h", "kernel/exit.c", "kernel/kthread.c"], "versions": [{"version": "6.14", "status": "affected"}, {"version": "0", "lessThan": "6.14", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.19", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.19.9", "lessThanOrEqual": "6.19.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.0", "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": "6.14", "versionEndExcluding": "6.18.19"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.14", "versionEndExcluding": "6.19.9"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.14", "versionEndExcluding": "7.0"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/4729c7b00a347fd37d0cbc265b85f2884c3e06b6"}, {"url": "https://git.kernel.org/stable/c/5a591d7a5e48d30100943940a30a6ab41b15c672"}, {"url": "https://git.kernel.org/stable/c/28aaa9c39945b7925a1cc1d513c8f21ed38f5e4f"}], "title": "kthread: consolidate kthread exit paths to prevent use-after-free", "x_generator": {"engine": "bippy-1.2.0"}}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2026-43402", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "yes"}, {"Technical Impact": "total"}], "version": "2.0.3", "timestamp": "2026-10-16T15:17:02.801558Z"}}}], "problemTypes": [{"descriptions": [{"lang": "en", "type": "CWE", "cweId": "CWE-416", "description": "CWE-416 Use After Free"}]}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-10-19T19:16:28.340Z"}}]}}

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It does not inherently cross a separate security authority such as a VM-to-host or IOMMU boundary.\nC:H - This is a use-after-free of a freed struct kthread left linked into a global list, with later list operations writing into reused slab memory such as struct pid. Kernel UAF memory corruption is treated as capable of yielding high confidentiality impact through read/info-disclosure primitives.\nI:H - The stale list entry causes writes through dangling list pointers into a reused object, including corruption of sensitive fields such as an RCU callback pointer. Such kernel UAF corruption is defensibly exploitable for arbitrary write or control-flow hijack.\nA:H - The observed failure mode is corrupted RCU callback function pointers and kernel crashes. 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The crash was traced back to the pidfs rhashtable\nconversion which replaced the 24-byte rb_node with an 8-byte rhash_head\nin struct pid, shrinking it from 160 to 144 bytes.\n\nstruct kthread (without CONFIG_BLK_CGROUP) is also 144 bytes. With\nCONFIG_SLAB_MERGE_DEFAULT and SLAB_HWCACHE_ALIGN both round up to\n192 bytes and share the same slab cache. struct pid.rcu.func and\nstruct kthread.affinity_node both sit at offset 0x78.\n\nWhen a kthread exits via make_task_dead() it bypasses kthread_exit() and\nmisses the affinity_node cleanup. free_kthread_struct() frees the memory\nwhile the node is still linked into the global kthread_affinity_list. A\nsubsequent list_del() by another kthread writes through dangling list\npointers into the freed and reused memory, corrupting the pid's\nrcu.func pointer.\n\nInstead of patching free_kthread_struct() to handle the missed cleanup,\nconsolidate all kthread exit paths. Turn kthread_exit() into a macro\nthat calls do_exit() and add kthread_do_exit() which is called from\ndo_exit() for any task with PF_KTHREAD set. This guarantees that\nkthread-specific cleanup always happens regardless of the exit path -\nmake_task_dead(), direct do_exit(), or kthread_exit().\n\nReplace __to_kthread() with a new tsk_is_kthread() accessor in the\npublic header. 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{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["include/linux/kthread.h", "kernel/exit.c", "kernel/kthread.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "4729c7b00a347fd37d0cbc265b85f2884c3e06b6", "status": "affected", "version": "4d13f4304fa43471bfea101658a11feec7b28ac0", "versionType": "git"}, {"lessThan": "5a591d7a5e48d30100943940a30a6ab41b15c672", "status": "affected", "version": "4d13f4304fa43471bfea101658a11feec7b28ac0", "versionType": "git"}, {"lessThan": "28aaa9c39945b7925a1cc1d513c8f21ed38f5e4f", "status": "affected", "version": "4d13f4304fa43471bfea101658a11feec7b28ac0", "versionType": "git"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["include/linux/kthread.h", "kernel/exit.c", "kernel/kthread.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "6.14"}, {"lessThan": "6.14", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "6.18.*", "status": "unaffected", "version": "6.18.19", "versionType": "semver"}, {"lessThanOrEqual": "6.19.*", "status": "unaffected", "version": "6.19.9", "versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "7.0", "versionType": "original_commit_for_fix"}]}], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "7484E98E-61F0-4DCE-9DBF-83D2F75F99EB", "versionEndExcluding": "6.18.19", "versionStartIncluding": "6.14", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "E825E7C3-FEAC-4FD3-8A81-78D7387948C9", "versionEndExcluding": "6.19.9", "versionStartIncluding": "6.19", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:7.0:rc1:*:*:*:*:*:*", "matchCriteriaId": "F253B622-8837-4245-BCE5-A7BF8FC76A16", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:7.0:rc2:*:*:*:*:*:*", "matchCriteriaId": "4AE85AD8-4641-4E7C-A2F4-305E2CD9EE64", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nkthread: consolidate kthread exit paths to prevent use-after-free\n\nGuillaume reported crashes via corrupted RCU callback function pointers\nduring KUnit testing. The crash was traced back to the pidfs rhashtable\nconversion which replaced the 24-byte rb_node with an 8-byte rhash_head\nin struct pid, shrinking it from 160 to 144 bytes.\n\nstruct kthread (without CONFIG_BLK_CGROUP) is also 144 bytes. With\nCONFIG_SLAB_MERGE_DEFAULT and SLAB_HWCACHE_ALIGN both round up to\n192 bytes and share the same slab cache. struct pid.rcu.func and\nstruct kthread.affinity_node both sit at offset 0x78.\n\nWhen a kthread exits via make_task_dead() it bypasses kthread_exit() and\nmisses the affinity_node cleanup. free_kthread_struct() frees the memory\nwhile the node is still linked into the global kthread_affinity_list. A\nsubsequent list_del() by another kthread writes through dangling list\npointers into the freed and reused memory, corrupting the pid's\nrcu.func pointer.\n\nInstead of patching free_kthread_struct() to handle the missed cleanup,\nconsolidate all kthread exit paths. Turn kthread_exit() into a macro\nthat calls do_exit() and add kthread_do_exit() which is called from\ndo_exit() for any task with PF_KTHREAD set. This guarantees that\nkthread-specific cleanup always happens regardless of the exit path -\nmake_task_dead(), direct do_exit(), or kthread_exit().\n\nReplace __to_kthread() with a new tsk_is_kthread() accessor in the\npublic header. Export do_exit() since module code using the\nkthread_exit() macro now needs it directly."}, {"lang": "es", "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nkthread: consolidar las rutas de salida de kthread para prevenir el uso despu\u00e9s de liberaci\u00f3n\n\nGuillaume inform\u00f3 de fallos a trav\u00e9s de punteros de funci\u00f3n de callback RCU corruptos durante las pruebas de KUnit. El fallo se rastre\u00f3 hasta la conversi\u00f3n de rhashtable de pidfs que reemplaz\u00f3 el rb_node de 24 bytes con un rhash_head de 8 bytes en la estructura pid, reduci\u00e9ndola de 160 a 144 bytes.\n\nLa estructura kthread (sin CONFIG_BLK_CGROUP) tambi\u00e9n es de 144 bytes. Con CONFIG_SLAB_MERGE_DEFAULT y SLAB_HWCACHE_ALIGN, ambos se redondean a 192 bytes y comparten la misma cach\u00e9 de slab. struct pid.rcu.func y struct kthread.affinity_node ambos se encuentran en el desplazamiento 0x78.\n\nCuando un kthread sale a trav\u00e9s de make_task_dead(), omite kthread_exit() y la limpieza de affinity_node. free_kthread_struct() libera la memoria mientras el nodo a\u00fan est\u00e1 vinculado a la kthread_affinity_list global. Una posterior list_del() por otro kthread escribe a trav\u00e9s de punteros de lista colgantes en la memoria liberada y reutilizada, corrompiendo el puntero rcu.func del pid.\n\nEn lugar de parchear free_kthread_struct() para manejar la limpieza omitida, consolidar todas las rutas de salida de kthread. Convertir kthread_exit() en una macro que llama a do_exit() y a\u00f1adir kthread_do_exit() que es llamada desde do_exit() para cualquier tarea con PF_KTHREAD establecido. Esto garantiza que la limpieza espec\u00edfica de kthread siempre ocurre independientemente de la ruta de salida - make_task_dead(), do_exit() directo, o kthread_exit().\n\nReemplazar __to_kthread() con un nuevo accesor tsk_is_kthread() en el encabezado p\u00fablico. Exportar do_exit() ya que el c\u00f3digo del m\u00f3dulo que usa la macro kthread_exit() ahora lo necesita directamente."}], "id": "CVE-2026-43402", "lastModified": "2026-11-11T20:10:00.273", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 9.8, "baseSeverity": "CRITICAL", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 5.9, "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-43402", "options": [{"exploitation": "none"}, {"automatable": "yes"}, {"technicalImpact": "total"}], "role": "CISA Coordinator", "timestamp": "2026-10-16T15:17:02.801558Z", "version": "2.0.3"}}]}, "published": "2026-05-08T15:16:51.670", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/28aaa9c39945b7925a1cc1d513c8f21ed38f5e4f"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/4729c7b00a347fd37d0cbc265b85f2884c3e06b6"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/5a591d7a5e48d30100943940a30a6ab41b15c672"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-416"}], "source": "nvd@nist.gov", "type": "Primary"}, {"description": [{"lang": "en", "value": "CWE-416"}], "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary"}]}

{"bugzilla": {"description": "kernel: kthread: consolidate kthread exit paths to prevent use-after-free", "id": "2468212", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2468212"}, "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-825", "details": ["A flaw was found in the Linux kernel. A vulnerability in the kernel thread (kthread) exit process can lead to a use-after-free condition. This occurs when a kthread exits without proper cleanup, allowing other kernel operations to access and corrupt previously freed memory. This can result in system instability and crashes."], "name": "CVE-2026-43402", "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": "Out of support scope", "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": "2026-05-08T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-43402\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-43402\nhttps://lore.kernel.org/linux-cve-announce/2026050840-CVE-2026-43402-28f0@gregkh/T"], "threat_severity": "Moderate"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[4d13f4304fa43471bfea101658a11feec7b28ac0,4729c7b00a347fd37d0cbc265b85f2884c3e06b6)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[4d13f4304fa43471bfea101658a11feec7b28ac0,5a591d7a5e48d30100943940a30a6ab41b15c672)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[4d13f4304fa43471bfea101658a11feec7b28ac0,28aaa9c39945b7925a1cc1d513c8f21ed38f5e4f)"}}], "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": "semver", "value": "6.14"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[0,6.14)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.18.19,6.19.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.19.9,6.20.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[7.0,*]"}}], "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": "2026-05-08T18:15:13.673846+00:00", "updated": "2026-05-21T20:30:18.531331+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}