CVE-2026-90247
Received
Received - Intake
BaseFortify
Vulnerability report for CVE-2026-90247, including description, CVSS score, EPSS score, affected products, exploitability, helpful resources, and attack-flow context.
Publication date: 2026-09-17
Last updated on: 2026-09-17
Assigner: kernel.org
Description
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.
CVSS Scores
EPSS Scores
| Probability: | |
| Percentile: |
Meta Information
Affected Vendors & Products
| Vendor | Product | Version / Range |
|---|---|---|
| Linux | Linux | eac9153f2b584c702cea02c1f1a57d85aa9aea42 |
| Linux | Linux | eac9153f2b584c702cea02c1f1a57d85aa9aea42 |
| Linux | Linux | eac9153f2b584c702cea02c1f1a57d85aa9aea42 |
| Linux | Linux | a7f4da875c16f3b8bef0d9ec67528111045bfcd8 |
| Linux | Linux | f1838da73cccb238b8be4ef464fce0168dc7ba84 |
| Linux | Linux | 4.19.92 |
| Linux | Linux | 5.4.7 |
| Linux | Linux | 5.5 |
Helpful Resources
Exploitability
CWE
KEV
| CWE ID | Description |
|---|---|
| CWE-UNKNOWN |
