{"api_version":"1","generated_at":"2026-11-01T16:50:34+00:00","cve":"CVE-2026-99103","urls":{"html":"https://cve.report/CVE-2026-99103","api":"https://cve.report/api/cve/CVE-2026-99103.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-99103","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-99103"},"summary":{"title":"workqueue: Fix unbound pool lifetime for pending pwqs","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nworkqueue: Fix unbound pool lifetime for pending pwqs\n\nKASAN reports a use-after-free of an unbound worker_pool in\nnode_activate_pending_pwq():\n\n  BUG: KASAN: slab-use-after-free in _raw_spin_trylock+0x6d/0x120\n  Read of size 4 at addr ffff8880089ce000 by task kworker/u22:0/318\n\n  CPU: 1 UID: 0 PID: 318 Comm: kworker/u22:0 Not tainted 7.2.0 #1 PREEMPT(lazy)\n  Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.15.0-1 04/01/2014\n  Workqueue:  0x0 (flush-8:0)\n  Call Trace:\n   <TASK>\n   dump_stack_lvl+0x53/0x70\n   print_report+0xce/0x610\n   kasan_report+0xce/0x100\n   _raw_spin_trylock+0x6d/0x120\n   pwq_dec_nr_in_flight+0x4b4/0xcb0\n   process_one_work+0x921/0x11a0\n   worker_thread+0x4d0/0xd20\n   kthread+0x2de/0x3c0\n   ret_from_fork+0x3aa/0x620\n   ret_from_fork_asm+0x1a/0x30\n   </TASK>\n\n  Allocated by task 311:\n   alloc_pwq+0x439/0xca0\n   apply_wqattrs_prepare+0x75e/0xd10\n   apply_workqueue_attrs_locked+0x44/0xa0\n   wq_nice_store+0x350/0x450\n\n  Freed by task 0:\n   kfree+0x127/0x3b0\n   rcu_core+0x523/0x1780\n   handle_softirqs+0x1b3/0x610\n\n  Last potentially related work creation:\n   put_unbound_pool+0x3f3/0x7d0\n   pwq_release_workfn+0x494/0x8e0\n   kthread_worker_fn+0x1ff/0x790\n\nCanceling the last inactive work skips pwq_dec_nr_active(), so an empty\npwq can remain on pending_pwqs when its refcnt reaches zero.\npwq_release_workfn() currently puts the pool before removing that pwq.\nIf this drops the last pool reference, the pool can be RCU-freed while\nthe pwq remains reachable, and node_activate_pending_pwq() may trylock\nthe freed pool->lock.\n\nRemove the pwq from pending_pwqs before putting the pool.","state":"PUBLISHED","assigner":"Linux","published_at":"2026-10-28 11:17:29","updated_at":"2026-10-30 13:21:45"},"problem_types":[],"metrics":[],"references":[{"url":"https://git.kernel.org/stable/c/cf9c8aaea0d47410df8708bec195889f3a85cd3c","name":"https://git.kernel.org/stable/c/cf9c8aaea0d47410df8708bec195889f3a85cd3c","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/390b9542fe670b8936738140ef9f349df6adeab6","name":"https://git.kernel.org/stable/c/390b9542fe670b8936738140ef9f349df6adeab6","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/9f5d5aef3072a33c6f9bfb954bb0cba1c2541849","name":"https://git.kernel.org/stable/c/9f5d5aef3072a33c6f9bfb954bb0cba1c2541849","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/3d2ef2b9f4c084ab498494d26495a82f7e15407b","name":"https://git.kernel.org/stable/c/3d2ef2b9f4c084ab498494d26495a82f7e15407b","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/f320b85c90fe5fc9d4d06badd450518323a94a7f","name":"https://git.kernel.org/stable/c/f320b85c90fe5fc9d4d06badd450518323a94a7f","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/6741dd3fd38e47c08bc39d11ef5fa141fa6d0441","name":"https://git.kernel.org/stable/c/6741dd3fd38e47c08bc39d11ef5fa141fa6d0441","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-99103","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-99103","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 5a70baec2294e8a7d0fcc4558741c23e752dad5c 6741dd3fd38e47c08bc39d11ef5fa141fa6d0441 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 843288afd3cc6f3342659c6cf81fc47684d25563 9f5d5aef3072a33c6f9bfb954bb0cba1c2541849 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 5797b1c18919cd9c289ded7954383e499f729ce0 390b9542fe670b8936738140ef9f349df6adeab6 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 5797b1c18919cd9c289ded7954383e499f729ce0 f320b85c90fe5fc9d4d06badd450518323a94a7f git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 5797b1c18919cd9c289ded7954383e499f729ce0 3d2ef2b9f4c084ab498494d26495a82f7e15407b git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 5797b1c18919cd9c289ded7954383e499f729ce0 cf9c8aaea0d47410df8708bec195889f3a85cd3c git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected fc67aebe34f22632ccb22faea48cc4d3134620a2 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 6.6.23 6.6.25 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 6.8.2 6.8.4 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 6.7.11 6.8 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 6.9","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.9 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.6.25 6.6.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.8.4 6.8.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.12.115 6.12.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.18.59 6.18.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.2.13 7.2.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.3 * original_commit_for_fix","platforms":[]}],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[],"vendor_comments":[],"enrichments":{"kev":null,"epss":{"cve_year":"2026","cve_id":"99103","cve":"CVE-2026-99103","epss":"0.001730000","percentile":"0.067350000","score_date":"2026-10-31","updated_at":"2026-11-01 00:01:53"},"legacy_qids":[]},"source_records":{"cve_program":{"containers":{"cna":{"affected":[{"defaultStatus":"unaffected","product":"Linux","programFiles":["kernel/workqueue.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"lessThan":"6741dd3fd38e47c08bc39d11ef5fa141fa6d0441","status":"affected","version":"5a70baec2294e8a7d0fcc4558741c23e752dad5c","versionType":"git"},{"lessThan":"9f5d5aef3072a33c6f9bfb954bb0cba1c2541849","status":"affected","version":"843288afd3cc6f3342659c6cf81fc47684d25563","versionType":"git"},{"lessThan":"390b9542fe670b8936738140ef9f349df6adeab6","status":"affected","version":"5797b1c18919cd9c289ded7954383e499f729ce0","versionType":"git"},{"lessThan":"f320b85c90fe5fc9d4d06badd450518323a94a7f","status":"affected","version":"5797b1c18919cd9c289ded7954383e499f729ce0","versionType":"git"},{"lessThan":"3d2ef2b9f4c084ab498494d26495a82f7e15407b","status":"affected","version":"5797b1c18919cd9c289ded7954383e499f729ce0","versionType":"git"},{"lessThan":"cf9c8aaea0d47410df8708bec195889f3a85cd3c","status":"affected","version":"5797b1c18919cd9c289ded7954383e499f729ce0","versionType":"git"},{"status":"affected","version":"fc67aebe34f22632ccb22faea48cc4d3134620a2","versionType":"git"},{"lessThan":"6.6.25","status":"affected","version":"6.6.23","versionType":"semver"},{"lessThan":"6.8.4","status":"affected","version":"6.8.2","versionType":"semver"},{"lessThan":"6.8","status":"affected","version":"6.7.11","versionType":"semver"}]},{"defaultStatus":"affected","product":"Linux","programFiles":["kernel/workqueue.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"status":"affected","version":"6.9"},{"lessThan":"6.9","status":"unaffected","version":"0","versionType":"semver"},{"lessThanOrEqual":"6.6.*","status":"unaffected","version":"6.6.25","versionType":"semver"},{"lessThanOrEqual":"6.8.*","status":"unaffected","version":"6.8.4","versionType":"semver"},{"lessThanOrEqual":"6.12.*","status":"unaffected","version":"6.12.115","versionType":"semver"},{"lessThanOrEqual":"6.18.*","status":"unaffected","version":"6.18.59","versionType":"semver"},{"lessThanOrEqual":"7.2.*","status":"unaffected","version":"7.2.13","versionType":"semver"},{"lessThanOrEqual":"*","status":"unaffected","version":"7.3","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"cpeMatch":[{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.6.25","versionStartIncluding":"6.6.23","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.8.4","versionStartIncluding":"6.8.2","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.12.115","versionStartIncluding":"6.9","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.18.59","versionStartIncluding":"6.9","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.2.13","versionStartIncluding":"6.9","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.3","versionStartIncluding":"6.9","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.7.11","vulnerable":true}],"negate":false,"operator":"OR"}]}],"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nworkqueue: Fix unbound pool lifetime for pending pwqs\n\nKASAN reports a use-after-free of an unbound worker_pool in\nnode_activate_pending_pwq():\n\n  BUG: KASAN: slab-use-after-free in _raw_spin_trylock+0x6d/0x120\n  Read of size 4 at addr ffff8880089ce000 by task kworker/u22:0/318\n\n  CPU: 1 UID: 0 PID: 318 Comm: kworker/u22:0 Not tainted 7.2.0 #1 PREEMPT(lazy)\n  Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.15.0-1 04/01/2014\n  Workqueue:  0x0 (flush-8:0)\n  Call Trace:\n   <TASK>\n   dump_stack_lvl+0x53/0x70\n   print_report+0xce/0x610\n   kasan_report+0xce/0x100\n   _raw_spin_trylock+0x6d/0x120\n   pwq_dec_nr_in_flight+0x4b4/0xcb0\n   process_one_work+0x921/0x11a0\n   worker_thread+0x4d0/0xd20\n   kthread+0x2de/0x3c0\n   ret_from_fork+0x3aa/0x620\n   ret_from_fork_asm+0x1a/0x30\n   </TASK>\n\n  Allocated by task 311:\n   alloc_pwq+0x439/0xca0\n   apply_wqattrs_prepare+0x75e/0xd10\n   apply_workqueue_attrs_locked+0x44/0xa0\n   wq_nice_store+0x350/0x450\n\n  Freed by task 0:\n   kfree+0x127/0x3b0\n   rcu_core+0x523/0x1780\n   handle_softirqs+0x1b3/0x610\n\n  Last potentially related work creation:\n   put_unbound_pool+0x3f3/0x7d0\n   pwq_release_workfn+0x494/0x8e0\n   kthread_worker_fn+0x1ff/0x790\n\nCanceling the last inactive work skips pwq_dec_nr_active(), so an empty\npwq can remain on pending_pwqs when its refcnt reaches zero.\npwq_release_workfn() currently puts the pool before removing that pwq.\nIf this drops the last pool reference, the pool can be RCU-freed while\nthe pwq remains reachable, and node_activate_pending_pwq() may trylock\nthe freed pool->lock.\n\nRemove the pwq from pending_pwqs before putting the pool."}],"providerMetadata":{"dateUpdated":"2026-10-30T12:41:45.076Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"references":[{"url":"https://git.kernel.org/stable/c/6741dd3fd38e47c08bc39d11ef5fa141fa6d0441"},{"url":"https://git.kernel.org/stable/c/9f5d5aef3072a33c6f9bfb954bb0cba1c2541849"},{"url":"https://git.kernel.org/stable/c/390b9542fe670b8936738140ef9f349df6adeab6"},{"url":"https://git.kernel.org/stable/c/f320b85c90fe5fc9d4d06badd450518323a94a7f"},{"url":"https://git.kernel.org/stable/c/3d2ef2b9f4c084ab498494d26495a82f7e15407b"},{"url":"https://git.kernel.org/stable/c/cf9c8aaea0d47410df8708bec195889f3a85cd3c"}],"title":"workqueue: Fix unbound pool lifetime for pending pwqs","x_generator":{"engine":"bippy-1.2.0"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2026-99103","datePublished":"2026-10-28T10:34:22.945Z","dateReserved":"2026-09-25T10:25:14.391Z","dateUpdated":"2026-10-30T12:41:45.076Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-10-28 11:17:29","lastModifiedDate":"2026-10-30 13:21:45","problem_types":[],"metrics":[],"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"99103","Ordinal":"1","Title":"workqueue: Fix unbound pool lifetime for pending pwqs","CVE":"CVE-2026-99103","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"99103","Ordinal":"1","NoteData":"In the Linux kernel, the following vulnerability has been resolved:\n\nworkqueue: Fix unbound pool lifetime for pending pwqs\n\nKASAN reports a use-after-free of an unbound worker_pool in\nnode_activate_pending_pwq():\n\n  BUG: KASAN: slab-use-after-free in _raw_spin_trylock+0x6d/0x120\n  Read of size 4 at addr ffff8880089ce000 by task kworker/u22:0/318\n\n  CPU: 1 UID: 0 PID: 318 Comm: kworker/u22:0 Not tainted 7.2.0 #1 PREEMPT(lazy)\n  Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.15.0-1 04/01/2014\n  Workqueue:  0x0 (flush-8:0)\n  Call Trace:\n   <TASK>\n   dump_stack_lvl+0x53/0x70\n   print_report+0xce/0x610\n   kasan_report+0xce/0x100\n   _raw_spin_trylock+0x6d/0x120\n   pwq_dec_nr_in_flight+0x4b4/0xcb0\n   process_one_work+0x921/0x11a0\n   worker_thread+0x4d0/0xd20\n   kthread+0x2de/0x3c0\n   ret_from_fork+0x3aa/0x620\n   ret_from_fork_asm+0x1a/0x30\n   </TASK>\n\n  Allocated by task 311:\n   alloc_pwq+0x439/0xca0\n   apply_wqattrs_prepare+0x75e/0xd10\n   apply_workqueue_attrs_locked+0x44/0xa0\n   wq_nice_store+0x350/0x450\n\n  Freed by task 0:\n   kfree+0x127/0x3b0\n   rcu_core+0x523/0x1780\n   handle_softirqs+0x1b3/0x610\n\n  Last potentially related work creation:\n   put_unbound_pool+0x3f3/0x7d0\n   pwq_release_workfn+0x494/0x8e0\n   kthread_worker_fn+0x1ff/0x790\n\nCanceling the last inactive work skips pwq_dec_nr_active(), so an empty\npwq can remain on pending_pwqs when its refcnt reaches zero.\npwq_release_workfn() currently puts the pool before removing that pwq.\nIf this drops the last pool reference, the pool can be RCU-freed while\nthe pwq remains reachable, and node_activate_pending_pwq() may trylock\nthe freed pool->lock.\n\nRemove the pwq from pending_pwqs before putting the pool.","Type":"Description","Title":"workqueue: Fix unbound pool lifetime for pending pwqs"}]}}}