bpf: Fix use-after-free on mm_struct in bpf_find_vma()
In the Linux kernel, the following vulnerability has been resolved: bpf: Fix use-after-free on mm_struct in bpf_find_vma() bpf_find_vma() reads task->mm and calls mmap_read_trylock(mm) without holding a reference on the mm. On a foreign task, a concurrent exit_mm() can free the mm_struct between the lockless read and the trylock, resulting in a use-after-free. mm_struct is not SLAB_TYPESAFE_BY_RCU. For the current task, task->mm is stable. For a foreign task, pin the mm under task->alloc_lock and release it with mmput_async(), mirroring commit d8e27d2d22b6 ("bpf: fix mm lifecycle in open-coded task_vma iterator"). Use spin_trylock() instead of get_task_mm() so BPF context does not block on alloc_lock. Reject irqs-disabled contexts and !CONFIG_MMU on the foreign-task path because dropping the mm reference is not safe there. Race: CPU0 (BPF program) CPU1 (exiting task) ============================ ========================== bpf_find_vma(foreign_task): mm = task->mm exit_mm(): task->mm = NULL mmput(mm) -> frees mm_struct mmap_read_trylock(mm) // UAF on mm
CVE-2026-93137
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-2026-93137
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": "7c7e3d31e7856a8260a254f8c71db416f7f9f5a1",
"lessThan": "db347840d6b6ee9bb9b8e4a985d4b4419f9f3200",
"versionType": "git"
},
{
"status": "affected",
"version": "7c7e3d31e7856a8260a254f8c71db416f7f9f5a1",
"lessThan": "8e1101fc4118019a69c96ced4aec93164f89cbd5",
"versionType": "git"
},
{
"status": "affected",
"version": "7c7e3d31e7856a8260a254f8c71db416f7f9f5a1",
"lessThan": "c7ad910e987008e125eeff448892e86852173384",
"versionType": "git"
},
{
"status": "affected",
"version": "7c7e3d31e7856a8260a254f8c71db416f7f9f5a1",
"lessThan": "86d54cf069fc5ae2e111c87933bebf6eb527978e",
"versionType": "git"
},
{
"status": "affected",
"version": "7c7e3d31e7856a8260a254f8c71db416f7f9f5a1",
"lessThan": "2b2a903bee56d312539046d9defa8023eec94760",
"versionType": "git"
},
{
"status": "affected",
"version": "7c7e3d31e7856a8260a254f8c71db416f7f9f5a1",
"lessThan": "47b079e2117a2ee52e21f8b72935900c702fc0b5",
"versionType": "git"
}
],
"programFiles": [
"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": "5.17"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "5.17",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "6.1.188",
"versionType": "semver",
"lessThanOrEqual": "6.1.*"
},
{
"status": "unaffected",
"version": "6.6.157",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.12.110",
"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/task_iter.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-93137
Source reference:
/cveMetadata/cveId
Publisher severity
high
Source reference: /containers/cna/metrics
- Event
- #37857 · Revision 1
- Added to Heist Feed
- Publisher date