bpf: Fix mmap_lock leak in irq_work path
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.
CVE-2026-90247
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: cve:CVE-2026-90247
Linux
Source reference: /containers/cna/affected/0/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Linux
Source reference: /containers/cna/affected/1/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "eac9153f2b584c702cea02c1f1a57d85aa9aea42",
"lessThan": "b6c9daf6097f9b39162b8e736a6ac7caf5ef6fc8",
"versionType": "git"
},
{
"status": "affected",
"version": "eac9153f2b584c702cea02c1f1a57d85aa9aea42",
"lessThan": "931f62311c058d79f29548f20943969bb441ce87",
"versionType": "git"
},
{
"status": "affected",
"version": "eac9153f2b584c702cea02c1f1a57d85aa9aea42",
"lessThan": "a052ad5edccf5319f50ed955de4368f8318a9f20",
"versionType": "git"
},
{
"status": "affected",
"version": "eac9153f2b584c702cea02c1f1a57d85aa9aea42",
"lessThan": "051f2da26ce377f683b938a3382e0f16d02f3139",
"versionType": "git"
},
{
"status": "affected",
"version": "eac9153f2b584c702cea02c1f1a57d85aa9aea42",
"lessThan": "fa9dcacdcdf487f0ffef64bf67622f1caed509f1",
"versionType": "git"
},
{
"status": "affected",
"version": "a7f4da875c16f3b8bef0d9ec67528111045bfcd8",
"versionType": "git"
},
{
"status": "affected",
"version": "f1838da73cccb238b8be4ef464fce0168dc7ba84",
"versionType": "git"
},
{
"status": "affected",
"version": "4.19.92",
"lessThan": "4.20",
"versionType": "semver"
},
{
"status": "affected",
"version": "5.4.7",
"lessThan": "5.5",
"versionType": "semver"
}
],
"programFiles": [
"kernel/bpf/mmap_unlock_work.h",
"kernel/bpf/stackmap.c",
"kernel/bpf/task_iter.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "5.5"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "5.5",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "6.6.160",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.12.114",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.18.52",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "7.2.6",
"versionType": "semver",
"lessThanOrEqual": "7.2.*"
},
{
"status": "unaffected",
"version": "7.3",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"kernel/bpf/mmap_unlock_work.h",
"kernel/bpf/stackmap.c",
"kernel/bpf/task_iter.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-90247
Source reference:
/cveMetadata/cveId
Publisher severity
No explicit severity was provided.
- Event
- #48644 · Revision 1
- Added to Heist Feed
- Publisher date