bpf: Fix exception exit lock checking for subprogs

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Summary

CVECVE-2026-31526
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-04-22 14:16:52 UTC
Updated2026-04-22 14:16:52 UTC
DescriptionIn 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

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected f18b03fabaa9b7c80e80b72a621f481f0d706ae0 c0281da1f2aa5c2fca3a05f79b86bea96591c358 git Not specified
CNA Linux Linux affected f18b03fabaa9b7c80e80b72a621f481f0d706ae0 5a399f3117642494e35545f6ca397d3e177c1f9b git Not specified
CNA Linux Linux affected f18b03fabaa9b7c80e80b72a621f481f0d706ae0 6c2128505f61b504c79a20b89596feba61388112 git Not specified
CNA Linux Linux affected 6.7 Not specified
CNA Linux Linux unaffected 6.7 semver Not specified
CNA Linux Linux unaffected 6.18.21 6.18.* semver Not specified
CNA Linux Linux unaffected 6.19.11 6.19.* semver Not specified
CNA Linux Linux unaffected 7.0 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/6c2128505f61b504c79a20b89596feba61388112 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/c0281da1f2aa5c2fca3a05f79b86bea96591c358 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/5a399f3117642494e35545f6ca397d3e177c1f9b 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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