CVE-2026-98537None▾ SunlitIn the Linux kernel, the following vulnerability has been resolved: workqueue: Fix NULL current_pwq deref in flush dependency check check_flush_dependency() uses current_wq_worker() to determine whether the caller is a workqueue worker…
▾ Sunlit zone — Low / medium · no exploitation signal
impact 2.8 · likelihood 0 · exploitation 0
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In the Linux kernel, the following vulnerability has been resolved:
workqueue: Fix NULL current_pwq deref in flush dependency check
check_flush_dependency() uses current_wq_worker() to determine whether the caller is a workqueue worker and then dereferences worker->current_pwq to test whether the current workqueue is WQ_MEM_RECLAIM.
current_wq_worker() only means that %current has PF_WQ_WORKER set. A kworker can reach check_flush_dependency() while it is not executing a work item. One such path is worker_thread() acting as the pool manager, where create_worker() does GFP_KERNEL allocation and the allocation path invokes the OOM notifier. In that state worker->current_pwq is NULL because current_pwq is set only by process_one_work() and cleared again after the work function returns.
[ 416.760634][ T375] Call trace: [ 416.760638][ T375] check_flush_dependency+0x80/0x120 (P) [ 416.760648][ T375] __flush_work+0x98/0x224 [ 416.760657][ T375] flush_work+0x30/0x44 [ 416.760665][ T375] ... [ 416.760710][ T375] blocking_notifier_call_chain+0x58/0xa0 [ 416.760719][ T375] out_of_memory+0xb4/0x458 [ 416.760730][ T375] __alloc_pages_may_oom+0x11c/0x1a8 [ 416.760739][ T375] __alloc_pages_slowpath+0x314/0x46c [ 416.760746][ T375] __alloc_frozen_pages_noprof+0x110/0x1a4 [ 416.760753][ T375] new_slab+0x12c/0x484 [ 416.760759][ T375] ___slab_alloc+0x7a8/0xc7c [ 416.760765][ T375] __slab_alloc+0x74/0xd8 [ 416.760772][ T375] __kmalloc_cache_node_noprof+0x2ac/0x304 [ 416.760779][ T375] alloc_worker+0x28/0x60 [ 416.760785][ T375] create_worker+0x4c/0x20c [ 416.760790][ T375] worker_thread+0xe8/0x2b8 [ 416.760796][ T375] kthread+0x1a8/0x200 [ 416.760805][ T375] ret_from_fork+0x10/0x20
Guard the WQ_MEM_RECLAIM-worker warning with worker->current_pwq. If the kworker is not currently executing a work item, there is no current workqueue to diagnose with that warning. The PF_MEMALLOC warning is left unchanged so explicit reclaim context flushing a !WQ_MEM_RECLAIM target is still reported.
Linux >= fca839c00a12d682cb59b3b620d109a1d850b262 < 8ffececcb88262389b4f91fed0fe4884b68204bcLinux >= fca839c00a12d682cb59b3b620d109a1d850b262 < 9bb739a5c5a570c28a62afb98e9326e2a49743c1Linux >= fca839c00a12d682cb59b3b620d109a1d850b262 < cc190a6a1d20b87e6a9435202fc2a3bd84c79fb3Linux >= fca839c00a12d682cb59b3b620d109a1d850b262 < 513121e69388604619ea8c0ee07e86a3d1b5b5dcLinux >= fca839c00a12d682cb59b3b620d109a1d850b262 < 0c6b9b1e295aeff1132ac7aa738148cc65f06485Linux >= fca839c00a12d682cb59b3b620d109a1d850b262 < 1dccf5dc2f8fe688270b261ca4216e03c6a1e674Linux >= fca839c00a12d682cb59b3b620d109a1d850b262 < f97e6d0572d1b39998e053732332bc3cfdd0b9aaLinux >= fca839c00a12d682cb59b3b620d109a1d850b262 < db6365ced4d5855e321f772b240c0e473bcfcdd5Linux 4.5Refer to the linked advisories for vendor-supplied fixes and affected version ranges.
Connected by shared product, vendor, weakness, or advisory.
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