bpf,lsm: Drop bpf_prog_free from sleepable_lsm_hooks

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Summary

CVECVE-2026-93173
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-17 17:18:13 UTC
Updated2026-10-19 10:17:07 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: bpf,lsm: Drop bpf_prog_free from sleepable_lsm_hooks __bpf_prog_put_rcu() is the call_rcu() callback for non-sleepable programs. security_bpf_prog_free() called from there fires bpf_prog_free in softirq; if a sleepable LSM prog is attached to that hook, might_fault() BUGs: BUG: sleeping function called from invalid context in_atomic(): 1, irqs_disabled(): 0, non_block: 0, pid: 5038 preempt_count: 101, expected: 0 Call Trace: <IRQ> __bpf_prog_enter_sleepable+0x1cd/0x320 kernel/bpf/trampoline.c:1255 bpf_trampoline_6442549705+0x53/0xd7 security_bpf_prog_free+0xde/0x130 security/security.c:5465 __bpf_prog_put_rcu+0xab/0xd0 kernel/bpf/syscall.c:2365 rcu_do_batch kernel/rcu/tree.c:2617 [inline] handle_softirqs+0x236/0x800 kernel/softirq.c:622 </IRQ> The call_rcu/call_rcu_tasks_trace split reflects the freed program's sleepability, not that of any attached observer. security_bpf_prog_free() also frees prog->aux->security, which has to stay after the grace period, so drop bpf_prog_free from sleepable_lsm_hooks rather than move the call. Non-sleepable observers still run there.

Risk And Classification

EPSS: 0.001680000 probability, percentile 0.064770000 (date 2026-09-19)

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 1b67772e4e3f16cd647b229cae95fc06d120be08 2135f661fae7160a7fc603cab43cbc7999e8bfce git Not specified
CNA Linux Linux affected 1b67772e4e3f16cd647b229cae95fc06d120be08 d5f2f741a900123fbcb7c7c0a002b81306fbe242 git Not specified
CNA Linux Linux affected 1b67772e4e3f16cd647b229cae95fc06d120be08 915c2d9d69fc6c5f9f41d12bf4a9c51293aaee62 git Not specified
CNA Linux Linux affected 1b67772e4e3f16cd647b229cae95fc06d120be08 2ce3f548cfc6a1fe4c53479cf8a21931cdfd51d8 git Not specified
CNA Linux Linux affected 6.9 Not specified
CNA Linux Linux unaffected 6.9 semver Not specified
CNA Linux Linux unaffected 6.12.110 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.52 6.18.* semver Not specified
CNA Linux Linux unaffected 7.2.6 7.2.* semver Not specified
CNA Linux Linux unaffected 7.3 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/d5f2f741a900123fbcb7c7c0a002b81306fbe242 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/2ce3f548cfc6a1fe4c53479cf8a21931cdfd51d8 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/915c2d9d69fc6c5f9f41d12bf4a9c51293aaee62 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/2135f661fae7160a7fc603cab43cbc7999e8bfce 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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