CVE-2026-90247

CVE CVE-2026-90247EUVD EUVD-2026-81840Published 2026-09-17T16:07:49.000Z

What the advisory describes

In the Linux kernel, the following vulnerability has been resolved: bpf: Fix mmap_lock leak in irq_work path stack_map_get_build_id_offset() introduced a per-CPU irq_work to defer mmap_read_unlock() from NMI context, and bpf_find_vma() later reused the same mmap_unlock_work. Both callers only check whether the work is busy before taking mmap_lock, so a nested caller can reuse the slot before the first caller queues it. Two read locks may then be acquired while only one deferred unlock runs, leaking a read lock and blocking exit_mmap(). Reserve the per-CPU slot before mmap_read_trylock(). Use the same wrapper in stackmap and bpf_find_vma() so both callers release the reservation on trylock failure. Keep rejecting the slot while the irq_work remains busy. Release it after the irq_work callback unlocks the mm.

Source: EUVD (ENISA), in the words of the advisory.

Products the advisory names

These come from the advisory itself, not from any check we performed.

Linux — Linux a7f4da875c16f3b8bef0d9ec67528111045bfcd8; f1838da73cccb238b8be4ef464fce0168dc7ba84; patch: 7.2.6; patch: 0; patch: 6.18.52; patch: 7.3-rc1; 5.4.7 <5.5; eac9153f2b584c702cea02c1f1a57d85aa9aea42 <fa9dcacdcdf487f0ffef64bf67622f1caed509f1; eac9153f2b584c702cea02c1f1a57d85aa9aea42 <a052ad5edccf5319f50ed955de4368f8318a9f20; 4.19.92 <4.20; 5.5; eac9153f2b584c702cea02c1f1a57d85aa9aea42 <051f2da26ce377f683b938a3382e0f16d02f3139

The versions shown are the advisory's own. Patchlage compares no version numbers and derives no judgement from them — which version is installed is something a person has to look up.

Carried in the product catalogue

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Linux — Linux

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