{"schema":"threatline.record/2","record":{"id":"CVE-2026-99103","aliases":[],"summary":"workqueue: Fix unbound pool lifetime for pending pwqs","details":"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.","categories":["Operating systems"],"product":"Linux","vendor":"Linux","ecosystem":null,"affected_ranges":[{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-99103","source_modified_at":"2026-10-28T10:34:22.945Z","fetched_at":"2026-10-28T15:55:58.673066Z","product":"Linux","vendor":"Linux","versions":[{"version":"5a70baec2294e8a7d0fcc4558741c23e752dad5c","lessThan":"6741dd3fd38e47c08bc39d11ef5fa141fa6d0441","status":"affected","versionType":"git"},{"version":"843288afd3cc6f3342659c6cf81fc47684d25563","lessThan":"9f5d5aef3072a33c6f9bfb954bb0cba1c2541849","status":"affected","versionType":"git"},{"version":"5797b1c18919cd9c289ded7954383e499f729ce0","lessThan":"f320b85c90fe5fc9d4d06badd450518323a94a7f","status":"affected","versionType":"git"},{"version":"5797b1c18919cd9c289ded7954383e499f729ce0","lessThan":"3d2ef2b9f4c084ab498494d26495a82f7e15407b","status":"affected","versionType":"git"},{"version":"5797b1c18919cd9c289ded7954383e499f729ce0","lessThan":"cf9c8aaea0d47410df8708bec195889f3a85cd3c","status":"affected","versionType":"git"},{"version":"fc67aebe34f22632ccb22faea48cc4d3134620a2","status":"affected","versionType":"git"},{"version":"6.6.23","lessThan":"6.6.25","status":"affected","versionType":"semver"},{"version":"6.8.2","lessThan":"6.8.4","status":"affected","versionType":"semver"},{"version":"6.7.11","lessThan":"6.8","status":"affected","versionType":"semver"}],"defaultStatus":"unaffected"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-99103","source_modified_at":"2026-10-28T10:34:22.945Z","fetched_at":"2026-10-28T15:55:58.673066Z","product":"Linux","vendor":"Linux","versions":[{"version":"6.9","status":"affected"},{"version":"0","lessThan":"6.9","status":"unaffected","versionType":"semver"},{"version":"6.6.25","lessThanOrEqual":"6.6.*","status":"unaffected","versionType":"semver"},{"version":"6.8.4","lessThanOrEqual":"6.8.*","status":"unaffected","versionType":"semver"},{"version":"6.18.59","lessThanOrEqual":"6.18.*","status":"unaffected","versionType":"semver"},{"version":"7.2.13","lessThanOrEqual":"7.2.*","status":"unaffected","versionType":"semver"},{"version":"7.3","lessThanOrEqual":"*","status":"unaffected","versionType":"original_commit_for_fix"}],"defaultStatus":"affected"}],"fixed_versions":[{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-99103","source_modified_at":"2026-10-28T10:34:22.945Z","fetched_at":"2026-10-28T15:55:58.673066Z","package":{"name":"Linux","ecosystem":null},"version":"6741dd3fd38e47c08bc39d11ef5fa141fa6d0441","basis":"first unaffected version stated in the CVE record"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-99103","source_modified_at":"2026-10-28T10:34:22.945Z","fetched_at":"2026-10-28T15:55:58.673066Z","package":{"name":"Linux","ecosystem":null},"version":"9f5d5aef3072a33c6f9bfb954bb0cba1c2541849","basis":"first unaffected version stated in the CVE record"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-99103","source_modified_at":"2026-10-28T10:34:22.945Z","fetched_at":"2026-10-28T15:55:58.673066Z","package":{"name":"Linux","ecosystem":null},"version":"3d2ef2b9f4c084ab498494d26495a82f7e15407b","basis":"first unaffected version stated in the CVE record"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-99103","source_modified_at":"2026-10-28T10:34:22.945Z","fetched_at":"2026-10-28T15:55:58.673066Z","package":{"name":"Linux","ecosystem":null},"version":"6.6.25","basis":"first unaffected version stated in the CVE record"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-99103","source_modified_at":"2026-10-28T10:34:22.945Z","fetched_at":"2026-10-28T15:55:58.673066Z","package":{"name":"Linux","ecosystem":null},"version":"6.8.4","basis":"first unaffected version stated in the CVE record"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-99103","source_modified_at":"2026-10-28T10:34:22.945Z","fetched_at":"2026-10-28T15:55:58.673066Z","package":{"name":"Linux","ecosystem":null},"version":"6.8","basis":"first unaffected version stated in the CVE record"}],"cvss":null,"severity":null,"kev":{"listed":false},"epss":{"probability":null,"percentile":null,"score_date":null},"published_at":"2026-10-28T10:34:22.945Z","modified_at":"2026-10-28T10:34:22.945Z","provenance":[{"source":"CVE List","url":"https://www.cve.org/CVERecord?id=CVE-2026-99103","fetched_at":"2026-10-28T15:55:58.673066Z","source_modified_at":"2026-10-28T10:34:22.945Z"}],"sources":["CVE List"],"references":[{"source":"CVE List","url":"https://git.kernel.org/stable/c/6741dd3fd38e47c08bc39d11ef5fa141fa6d0441"},{"source":"CVE List","url":"https://git.kernel.org/stable/c/9f5d5aef3072a33c6f9bfb954bb0cba1c2541849"},{"source":"CVE List","url":"https://git.kernel.org/stable/c/f320b85c90fe5fc9d4d06badd450518323a94a7f"},{"source":"CVE List","url":"https://git.kernel.org/stable/c/3d2ef2b9f4c084ab498494d26495a82f7e15407b"},{"source":"CVE List","url":"https://git.kernel.org/stable/c/cf9c8aaea0d47410df8708bec195889f3a85cd3c"}],"locations":[],"motoko_assessment":{"status":"requires_architecture_review","automatic_remediation":false},"cve_state":"PUBLISHED","classification":{"method":"product-first software-layer rules","rules_version":"2.1","matched_on":"product","confidence":"heuristic","reviewed":false},"change_timestamp":"2026-10-28T10:34:22.945Z","content_hash":"67a52728e5e55e9d9c398a0b41a65183ddc6281d7047a1d56055d3830ff6ce38"}}