CVE-2026-90247bpf: Fix mmap_lock leak in irq_work path
Updated under an hour ago ()
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No exploitation reported and no EPSS estimate yet.
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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.
- CVSS
- Not yet scored
- Weakness (CWE)
- Not given
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Linux
- NVD analysis
- Received
- Record last updated
- Sep 17, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Linux Linux linux:linux (from the name) | from eac9153f2b584c702cea02c1f1a57d85aa9aea42 before a052ad5edccf5319f50ed955de4368f8318a9f20; from eac9153f2b584c702cea02c1f1a57d85aa9aea42 before 051f2da26ce377f683b938a3382e0f16d02f3139; from eac9153f2b584c702cea02c1f1a57d85aa9aea42 before fa9dcacdcdf487f0ffef64bf67622f1caed509f1; a7f4da875c16f3b8bef0d9ec67528111045bfcd8; f1838da73cccb238b8be4ef464fce0168dc7ba84; from 4.19.92 before 4.20; from 5.4.7 before 5.5 | CNA record |
References
- https://git.kernel.org/stable/c/a052ad5edccf5319f50ed955de4368f8318a9f20
- https://git.kernel.org/stable/c/051f2da26ce377f683b938a3382e0f16d02f3139
- https://git.kernel.org/stable/c/fa9dcacdcdf487f0ffef64bf67622f1caed509f1
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.