bpf,lsm: Drop bpf_prog_free from sleepable_lsm_hooks (CVE-2026-93173) | HOL Guard CVE

Unknown severity · Source severity not reportedCVE-2026-93173

bpf,lsm: Drop bpf_prog_free from sleepable_lsm_hooks

Answer in brief

CVE-2026-93173 records a Unknown severity vulnerability in bpf,lsm: Drop bpf_prog_free from sleepable_lsm_hooks. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Sep 17, 2026Updated Sep 17, 2026Source checked Sep 17, 2026First seen by HOL Sep 17, 2026Material review Sep 17, 2026

Upstream Advisory

Key facts

Risk: Unknown severitySource severity not reported
Exploitation: Not marked as known exploited
Affected software: 2 mapped packages or products
Fix availability: Available

Why this deserves its current priority

A CVSS score is not reported in the current record. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
Linux/Linuxgeneric	>=1b67772e4e3f16cd647b229cae95fc06d120be08 <2135f661fae7160a7fc603cab43cbc7999e8bfce \|\| >=1b67772e4e3f16cd647b229cae95fc06d120be08 <d5f2f741a900123fbcb7c7c0a002b81306fbe242 \|\| >=1b67772e4e3f16cd647b229cae95fc06d120be08 <915c2d9d69fc6c5f9f41d12bf4a9c51293aaee62 \|\| >=1b67772e4e3f16cd647b229cae95fc06d120be08 <2ce3f548cfc6a1fe4c53479cf8a21931cdfd51d8	2135f661fae7160a7fc603cab43cbc7999e8bfce, d5f2f741a900123fbcb7c7c0a002b81306fbe242, 915c2d9d69fc6c5f9f41d12bf4a9c51293aaee62, 2ce3f548cfc6a1fe4c53479cf8a21931cdfd51d8
Linux/Linuxgeneric	6.9	Not reported

Recommended response

Check inventory. Check lockfiles and deployed manifests for Linux/Linux, Linux/Linux.
Review the reported fix. Update Linux/Linux to 2135f661fae7160a7fc603cab43cbc7999e8bfce if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

Published upstream
Sep 17, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Sep 17, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Sep 17, 2026

Sources and claim methodology

Upstream source description

In 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.

Quoted source text, attributed separately from HOL analysis.