CVE-2026-99103None▾ SunlitIn the Linux kernel, the following vulnerability has been resolved: workqueue: Fix unbound pool lifetime for pending pwqs KASAN reports a use-after-free of an unbound worker_pool in node_activate_pending_pwq(): BUG: KASAN: slab-use-…
▾ Sunlit zone — Low / medium · no exploitation signal
impact 2.8 · likelihood 0 · exploitation 0
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Exploit-prediction probability, daily snapshots since Oct 29.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via CVEORG
0.2%
Last analysed / modified upstream
0.2% → 0.2%
In the Linux kernel, the following vulnerability has been resolved:
workqueue: Fix unbound pool lifetime for pending pwqs
KASAN reports a use-after-free of an unbound worker_pool in node_activate_pending_pwq():
BUG: KASAN: slab-use-after-free in _raw_spin_trylock+0x6d/0x120 Read of size 4 at addr ffff8880089ce000 by task kworker/u22:0/318
CPU: 1 UID: 0 PID: 318 Comm: kworker/u22:0 Not tainted 7.2.0 #1 PREEMPT(lazy) Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.15.0-1 04/01/2014 Workqueue: 0x0 (flush-8:0) Call Trace: <TASK> dump_stack_lvl+0x53/0x70 print_report+0xce/0x610 kasan_report+0xce/0x100 _raw_spin_trylock+0x6d/0x120 pwq_dec_nr_in_flight+0x4b4/0xcb0 process_one_work+0x921/0x11a0 worker_thread+0x4d0/0xd20 kthread+0x2de/0x3c0 ret_from_fork+0x3aa/0x620 ret_from_fork_asm+0x1a/0x30 </TASK>
Allocated by task 311: alloc_pwq+0x439/0xca0 apply_wqattrs_prepare+0x75e/0xd10 apply_workqueue_attrs_locked+0x44/0xa0 wq_nice_store+0x350/0x450
Freed by task 0: kfree+0x127/0x3b0 rcu_core+0x523/0x1780 handle_softirqs+0x1b3/0x610
Last potentially related work creation: put_unbound_pool+0x3f3/0x7d0 pwq_release_workfn+0x494/0x8e0 kthread_worker_fn+0x1ff/0x790
Canceling the last inactive work skips pwq_dec_nr_active(), so an empty pwq can remain on pending_pwqs when its refcnt reaches zero. pwq_release_workfn() currently puts the pool before removing that pwq. If this drops the last pool reference, the pool can be RCU-freed while the pwq remains reachable, and node_activate_pending_pwq() may trylock the freed pool->lock.
Remove the pwq from pending_pwqs before putting the pool.
Linux >= 5a70baec2294e8a7d0fcc4558741c23e752dad5c < 6741dd3fd38e47c08bc39d11ef5fa141fa6d0441Linux >= 843288afd3cc6f3342659c6cf81fc47684d25563 < 9f5d5aef3072a33c6f9bfb954bb0cba1c2541849Linux >= 5797b1c18919cd9c289ded7954383e499f729ce0 < 390b9542fe670b8936738140ef9f349df6adeab6Linux >= 5797b1c18919cd9c289ded7954383e499f729ce0 < f320b85c90fe5fc9d4d06badd450518323a94a7fLinux >= 5797b1c18919cd9c289ded7954383e499f729ce0 < 3d2ef2b9f4c084ab498494d26495a82f7e15407bLinux >= 5797b1c18919cd9c289ded7954383e499f729ce0 < cf9c8aaea0d47410df8708bec195889f3a85cd3cLinux fc67aebe34f22632ccb22faea48cc4d3134620a2Linux >= 6.6.23 < 6.6.25Linux >= 6.8.2 < 6.8.4Linux >= 6.7.11 < 6.8Linux 6.9Refer to the linked advisories for vendor-supplied fixes and affected version ranges.
Connected by shared product, vendor, weakness, or advisory.
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