bpf: Fix exception exit lock checking for subprogs
In the Linux kernel, the following vulnerability has been resolved: bpf: Fix exception exit lock checking for subprogs process_bpf_exit_full() passes check_lock = !curframe to check_resource_leak(), which is false in cases when bpf_throw() is called from a static subprog. This makes check_resource_leak() to skip validation of active_rcu_locks, active_preempt_locks, and active_irq_id on exception exits from subprogs. At runtime bpf_throw() unwinds the stack via ORC without releasing any user-acquired locks, which may cause various issues as the result. Fix by setting check_lock = true for exception exits regardless of curframe, since exceptions bypass all intermediate frame cleanup. Update the error message prefix to "bpf_throw" for exception exits to distinguish them from normal BPF_EXIT. Fix reject_subprog_with_rcu_read_lock test which was previously passing for the wrong reason. Test program returned directly from the subprog call without closing the RCU section, so the error was triggered by the unclosed RCU lock on normal exit, not by bpf_throw. Update __msg annotations for affected tests to match the new "bpf_throw" error prefix. The spin_lock case is not affected because they are already checked [1] at the call site in do_check_insn() before bpf_throw can run. [1] https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/kernel/bpf/verifier.c?h=v7.0-rc4#n21098
CVE-2026-31526
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-2026-31526
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": "f18b03fabaa9b7c80e80b72a621f481f0d706ae0",
"lessThan": "4eca06a55417c3b2e538656d12c89e224343653e",
"versionType": "git"
},
{
"status": "affected",
"version": "f18b03fabaa9b7c80e80b72a621f481f0d706ae0",
"lessThan": "c0281da1f2aa5c2fca3a05f79b86bea96591c358",
"versionType": "git"
},
{
"status": "affected",
"version": "f18b03fabaa9b7c80e80b72a621f481f0d706ae0",
"lessThan": "5a399f3117642494e35545f6ca397d3e177c1f9b",
"versionType": "git"
},
{
"status": "affected",
"version": "f18b03fabaa9b7c80e80b72a621f481f0d706ae0",
"lessThan": "6c2128505f61b504c79a20b89596feba61388112",
"versionType": "git"
}
],
"programFiles": [
"kernel/bpf/verifier.c",
"tools/testing/selftests/bpf/progs/exceptions_fail.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "6.7"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "6.7",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "6.12.114",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.18.21",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "6.19.11",
"versionType": "semver",
"lessThanOrEqual": "6.19.*"
},
{
"status": "unaffected",
"version": "7.0",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"kernel/bpf/verifier.c",
"tools/testing/selftests/bpf/progs/exceptions_fail.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-31526
Source reference:
/cveMetadata/cveId
Publisher severity
No explicit severity was provided.
- Event
- #46132 · Revision 1
- Added to Heist Feed
- Publisher date