CVE-2026-90247
Description
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.
How to fix
- Linux Linuxd6d091873e12d1de36d7228c4f452e6cace3a23e, b6c9daf6097f9b39162b8e736a6ac7caf5ef6fc8, 931f62311c058d79f29548f20943969bb441ce87, a052ad5edccf5319f50ed955de4368f8318a9f20, 051f2da26ce377f683b938a3382e0f16d02f3139, fa9dcacdcdf487f0ffef64bf67622f1caed509f1, 4.20, 5.5 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| Linux Linux | eac9153f2b584c702cea02c1f1a57d85aa9aea42 ≤ v < d6d091873e12d1de36d7228c4f452e6cace3a23e, eac9153f2b584c702cea02c1f1a57d85aa9aea42 ≤ v < b6c9daf6097f9b39162b8e736a6ac7caf5ef6fc8, eac9153f2b584c702cea02c1f1a57d85aa9aea42 ≤ v < 931f62311c058d79f29548f20943969bb441ce87, eac9153f2b584c702cea02c1f1a57d85aa9aea42 ≤ v < a052ad5edccf5319f50ed955de4368f8318a9f20, eac9153f2b584c702cea02c1f1a57d85aa9aea42 ≤ v < 051f2da26ce377f683b938a3382e0f16d02f3139, eac9153f2b584c702cea02c1f1a57d85aa9aea42 ≤ v < fa9dcacdcdf487f0ffef64bf67622f1caed509f1, a7f4da875c16f3b8bef0d9ec67528111045bfcd8, f1838da73cccb238b8be4ef464fce0168dc7ba84, 4.19.92 ≤ v < 4.20, 5.4.7 ≤ v < 5.5, 5.5 | d6d091873e12d1de36d7228c4f452e6cace3a23e, b6c9daf6097f9b39162b8e736a6ac7caf5ef6fc8, 931f62311c058d79f29548f20943969bb441ce87, a052ad5edccf5319f50ed955de4368f8318a9f20, 051f2da26ce377f683b938a3382e0f16d02f3139, fa9dcacdcdf487f0ffef64bf67622f1caed509f1, 4.20, 5.5 |
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