CVE-2026-90247
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.
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Keep rejecting the slot while the irq_work remains busy. Release it after the irq_work callback unlocks the mm.
CVSS
NVD no ha asignado puntuación CVSS a esta CVE (habitual desde el cambio de política de abril de 2026).
Probabilidad de explotación (EPSS)
- Probabilidad de explotación en los próximos 30 días: 0.21%
- Percentil entre todas las CVEs puntuadas: 10
- Fecha de la puntuación: 5/10/2026
EPSS (Exploit Prediction Scoring System, de FIRST) estima la probabilidad de que una vulnerabilidad sea explotada en 30 días. Complementa a CVSS (impacto) y a CISA KEV (explotación confirmada).
Tecnologías afectadas (1)
⚠ Inferidas por IA a partir de la descripción — NVD aún no ha analizado esta CVE; no son CPE verificados.
Referencias
JSON original (NVD)
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{
"id": "CVE-2026-90247",
"cveTags": [],
"metrics": {},
"affected": [
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"affectedData": [
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "eac9153f2b584c702cea02c1f1a57d85aa9aea42",
"lessThan": "a052ad5edccf5319f50ed955de4368f8318a9f20",
"versionType": "git"
},
{
"status": "affected",
"version": "eac9153f2b584c702cea02c1f1a57d85aa9aea42",
"lessThan": "051f2da26ce377f683b938a3382e0f16d02f3139",
"versionType": "git"
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{
"status": "affected",
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"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": "6.18.52",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "7.2.6",
"versionType": "semver",
"lessThanOrEqual": "7.2.*"
},
{
"status": "unaffected",
"version": "7.3-rc1",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"kernel/bpf/mmap_unlock_work.h",
"kernel/bpf/stackmap.c",
"kernel/bpf/task_iter.c"
],
"defaultStatus": "affected"
}
]
}
],
"published": "2026-09-17T17:17:20.803",
"references": [
{
"url": "https://git.kernel.org/stable/c/051f2da26ce377f683b938a3382e0f16d02f3139",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/a052ad5edccf5319f50ed955de4368f8318a9f20",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/fa9dcacdcdf487f0ffef64bf67622f1caed509f1",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}
],
"vulnStatus": "Received",
"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."
}
],
"lastModified": "2026-09-17T17:17:20.803",
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}