{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-90247","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","state":"PUBLISHED","assignerShortName":"Linux","dateReserved":"2026-09-11T19:38:34.795Z","datePublished":"2026-09-17T16:07:49.444Z","dateUpdated":"2026-09-17T16:07:49.444Z"},"containers":{"cna":{"providerMetadata":{"orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux","dateUpdated":"2026-09-17T16:07:49.444Z"},"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: Fix mmap_lock leak in irq_work path\n\nstack_map_get_build_id_offset() introduced a per-CPU irq_work to defer\nmmap_read_unlock() from NMI context, and bpf_find_vma() later reused the\nsame mmap_unlock_work. Both callers only check whether the work is busy\nbefore taking mmap_lock, so a nested caller can reuse the slot before the\nfirst caller queues it. Two read locks may then be acquired while only one\ndeferred unlock runs, leaking a read lock and blocking exit_mmap().\n\nReserve the per-CPU slot before mmap_read_trylock(). Use the same wrapper\nin stackmap and bpf_find_vma() so both callers release the reservation on\ntrylock failure. Keep rejecting the slot while the irq_work remains busy.\nRelease it after the irq_work callback unlocks the mm."}],"affected":[{"product":"Linux","vendor":"Linux","defaultStatus":"unaffected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["kernel/bpf/mmap_unlock_work.h","kernel/bpf/stackmap.c","kernel/bpf/task_iter.c"],"versions":[{"version":"eac9153f2b584c702cea02c1f1a57d85aa9aea42","lessThan":"a052ad5edccf5319f50ed955de4368f8318a9f20","status":"affected","versionType":"git"},{"version":"eac9153f2b584c702cea02c1f1a57d85aa9aea42","lessThan":"051f2da26ce377f683b938a3382e0f16d02f3139","status":"affected","versionType":"git"},{"version":"eac9153f2b584c702cea02c1f1a57d85aa9aea42","lessThan":"fa9dcacdcdf487f0ffef64bf67622f1caed509f1","status":"affected","versionType":"git"},{"version":"a7f4da875c16f3b8bef0d9ec67528111045bfcd8","status":"affected","versionType":"git"},{"version":"f1838da73cccb238b8be4ef464fce0168dc7ba84","status":"affected","versionType":"git"},{"version":"4.19.92","lessThan":"4.20","status":"affected","versionType":"semver"},{"version":"5.4.7","lessThan":"5.5","status":"affected","versionType":"semver"}]},{"product":"Linux","vendor":"Linux","defaultStatus":"affected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["kernel/bpf/mmap_unlock_work.h","kernel/bpf/stackmap.c","kernel/bpf/task_iter.c"],"versions":[{"version":"5.5","status":"affected"},{"version":"0","lessThan":"5.5","status":"unaffected","versionType":"semver"},{"version":"6.18.52","lessThanOrEqual":"6.18.*","status":"unaffected","versionType":"semver"},{"version":"7.2.6","lessThanOrEqual":"7.2.*","status":"unaffected","versionType":"semver"},{"version":"7.3-rc1","lessThanOrEqual":"*","status":"unaffected","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.5","versionEndExcluding":"6.18.52"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.5","versionEndExcluding":"7.2.6"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.5","versionEndExcluding":"7.3-rc1"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.19.92"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.4.7"}]}]}],"references":[{"url":"https://git.kernel.org/stable/c/a052ad5edccf5319f50ed955de4368f8318a9f20"},{"url":"https://git.kernel.org/stable/c/051f2da26ce377f683b938a3382e0f16d02f3139"},{"url":"https://git.kernel.org/stable/c/fa9dcacdcdf487f0ffef64bf67622f1caed509f1"}],"title":"bpf: Fix mmap_lock leak in irq_work path","x_generator":{"engine":"bippy-1.2.0"}}}}