{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-99103", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-09-25T10:25:14.391Z", "datePublished": "2026-10-28T10:34:22.945Z", "dateUpdated": "2026-10-28T10:34:22.945Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-10-28T10:34:22.945Z" }, "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 \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 \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." } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "kernel/workqueue.c" ], "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" } ] }, { "product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "kernel/workqueue.c" ], "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" } ] } ], "cpeApplicability": [ { "nodes": [ { "operator": "OR", "negate": false, "cpeMatch": [ { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.6.23", "versionEndExcluding": "6.6.25" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.8.2", "versionEndExcluding": "6.8.4" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.9", "versionEndExcluding": "6.18.59" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.9", "versionEndExcluding": "7.2.13" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.9", "versionEndExcluding": "7.3" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.7.11" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/6741dd3fd38e47c08bc39d11ef5fa141fa6d0441" }, { "url": "https://git.kernel.org/stable/c/9f5d5aef3072a33c6f9bfb954bb0cba1c2541849" }, { "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" } } } }