{"id":"CVE-2026-93173","summary":"bpf,lsm: Drop bpf_prog_free from sleepable_lsm_hooks","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nbpf,lsm: Drop bpf_prog_free from sleepable_lsm_hooks\n\n__bpf_prog_put_rcu() is the call_rcu() callback for non-sleepable programs.\nsecurity_bpf_prog_free() called from there fires bpf_prog_free in softirq;\nif a sleepable LSM prog is attached to that hook, might_fault() BUGs:\n\n  BUG: sleeping function called from invalid context\n  in_atomic(): 1, irqs_disabled(): 0, non_block: 0, pid: 5038\n  preempt_count: 101, expected: 0\n  Call Trace:\n   \u003cIRQ\u003e\n   __bpf_prog_enter_sleepable+0x1cd/0x320 kernel/bpf/trampoline.c:1255\n   bpf_trampoline_6442549705+0x53/0xd7\n   security_bpf_prog_free+0xde/0x130 security/security.c:5465\n   __bpf_prog_put_rcu+0xab/0xd0 kernel/bpf/syscall.c:2365\n   rcu_do_batch kernel/rcu/tree.c:2617 [inline]\n   handle_softirqs+0x236/0x800 kernel/softirq.c:622\n   \u003c/IRQ\u003e\n\nThe call_rcu/call_rcu_tasks_trace split reflects the freed program's\nsleepability, not that of any attached observer.\n\nsecurity_bpf_prog_free() also frees prog-\u003eaux-\u003esecurity, which has to stay\nafter the grace period, so drop bpf_prog_free from sleepable_lsm_hooks\nrather than move the call. Non-sleepable observers still run there.","modified":"2026-09-18T03:48:44.810813192Z","published":"2026-09-17T16:12:03.229Z","database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/93xxx/CVE-2026-93173.json","cna_assigner":"Linux"},"references":[{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"},{"type":"WEB","url":"https://git.kernel.org/stable/c/2135f661fae7160a7fc603cab43cbc7999e8bfce"},{"type":"WEB","url":"https://git.kernel.org/stable/c/2ce3f548cfc6a1fe4c53479cf8a21931cdfd51d8"},{"type":"WEB","url":"https://git.kernel.org/stable/c/915c2d9d69fc6c5f9f41d12bf4a9c51293aaee62"},{"type":"WEB","url":"https://git.kernel.org/stable/c/d5f2f741a900123fbcb7c7c0a002b81306fbe242"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/93xxx/CVE-2026-93173.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-93173"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"1b67772e4e3f16cd647b229cae95fc06d120be08"},{"fixed":"2135f661fae7160a7fc603cab43cbc7999e8bfce"},{"fixed":"d5f2f741a900123fbcb7c7c0a002b81306fbe242"},{"fixed":"915c2d9d69fc6c5f9f41d12bf4a9c51293aaee62"},{"fixed":"2ce3f548cfc6a1fe4c53479cf8a21931cdfd51d8"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-93173.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"6.9.0"},{"fixed":"6.12.110"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.13.0"},{"fixed":"6.18.52"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.19.0"},{"fixed":"7.2.6"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-93173.json"}}],"schema_version":"1.9.0"}