bpf: Fix vmlinux BTF prep race in bpf_get_btf_vmlinux
In the Linux kernel, the following vulnerability has been resolved: bpf: Fix vmlinux BTF prep race in bpf_get_btf_vmlinux bpf_get_btf_vmlinux() lazily parses the vmlinux BTF under the bpf_verifier_lock, but publishes the result through a plain store and re-checks it through a plain lockless load. Nothing orders the stores initializing the struct btf inside btf_parse_vmlinux() against the store publishing the pointer: On a weakly ordered arch, a concurrent first-time caller taking the lockless fast path could in principle observe the pointer before the parsed contents are visible. The mutex_unlock() does not help such a reader given it only synchronizes with a later acquisition of the same lock. Thus, publish the pointer with smp_store_release() and read it on the fast path with smp_load_acquire(). Acquire semantics are needed rather than a dependency-ordered READ_ONCE(): btf_parse_vmlinux() also populates globals outside the returned object (e.g. bpf_ctx_convert.t). An address dependency would only order accesses performed through the pointer and not cover other globals.
CVE-2026-93138
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-2026-93138
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": "8580ac9404f6240668a026785d7d8856f0530409",
"lessThan": "f32a4a40bc635be25d6816da4bd91e9e58c31bf3",
"versionType": "git"
},
{
"status": "affected",
"version": "8580ac9404f6240668a026785d7d8856f0530409",
"lessThan": "a7fe72d780122eb934536f1719abad445f6afdf7",
"versionType": "git"
},
{
"status": "affected",
"version": "8580ac9404f6240668a026785d7d8856f0530409",
"lessThan": "e18a10b39c994f04e1ebd7f8fc042bb1ca8ad053",
"versionType": "git"
},
{
"status": "affected",
"version": "8580ac9404f6240668a026785d7d8856f0530409",
"lessThan": "978524ecfc1c539282df5858de1eec20748c6f74",
"versionType": "git"
},
{
"status": "affected",
"version": "8580ac9404f6240668a026785d7d8856f0530409",
"lessThan": "eaf302628a78806f66d8224d6ba03fb4d5025de4",
"versionType": "git"
},
{
"status": "affected",
"version": "8580ac9404f6240668a026785d7d8856f0530409",
"lessThan": "2892f3f44bf865c8fb6b6c0960edec4cc91806ee",
"versionType": "git"
},
{
"status": "affected",
"version": "8580ac9404f6240668a026785d7d8856f0530409",
"lessThan": "86d11c594d60b255b526fa5260f669463fb1a063",
"versionType": "git"
},
{
"status": "affected",
"version": "8580ac9404f6240668a026785d7d8856f0530409",
"lessThan": "92863e678070f57c17c868e4bfa2441a5c61ad2b",
"versionType": "git"
}
],
"programFiles": [
"kernel/bpf/verifier.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": "5.10.270",
"versionType": "semver",
"lessThanOrEqual": "5.10.*"
},
{
"status": "unaffected",
"version": "5.15.221",
"versionType": "semver",
"lessThanOrEqual": "5.15.*"
},
{
"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/verifier.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-93138
Source reference:
/cveMetadata/cveId
Publisher severity
high
Source reference: /containers/cna/metrics
- Event
- #37859 · Revision 1
- Added to Heist Feed
- Publisher date