{"api_version":"1","generated_at":"2026-09-17T23:44:44+00:00","cve":"CVE-2026-93173","urls":{"html":"https://cve.report/CVE-2026-93173","api":"https://cve.report/api/cve/CVE-2026-93173.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-93173","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-93173"},"summary":{"title":"bpf,lsm: Drop bpf_prog_free from sleepable_lsm_hooks","description":"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   <IRQ>\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   </IRQ>\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->aux->security, 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.","state":"PUBLISHED","assigner":"Linux","published_at":"2026-09-17 17:18:13","updated_at":"2026-09-17 17:18:13"},"problem_types":[],"metrics":[],"references":[{"url":"https://git.kernel.org/stable/c/d5f2f741a900123fbcb7c7c0a002b81306fbe242","name":"https://git.kernel.org/stable/c/d5f2f741a900123fbcb7c7c0a002b81306fbe242","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/2ce3f548cfc6a1fe4c53479cf8a21931cdfd51d8","name":"https://git.kernel.org/stable/c/2ce3f548cfc6a1fe4c53479cf8a21931cdfd51d8","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/915c2d9d69fc6c5f9f41d12bf4a9c51293aaee62","name":"https://git.kernel.org/stable/c/915c2d9d69fc6c5f9f41d12bf4a9c51293aaee62","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/2135f661fae7160a7fc603cab43cbc7999e8bfce","name":"https://git.kernel.org/stable/c/2135f661fae7160a7fc603cab43cbc7999e8bfce","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-93173","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-93173","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 1b67772e4e3f16cd647b229cae95fc06d120be08 2135f661fae7160a7fc603cab43cbc7999e8bfce git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 1b67772e4e3f16cd647b229cae95fc06d120be08 d5f2f741a900123fbcb7c7c0a002b81306fbe242 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 1b67772e4e3f16cd647b229cae95fc06d120be08 915c2d9d69fc6c5f9f41d12bf4a9c51293aaee62 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 1b67772e4e3f16cd647b229cae95fc06d120be08 2ce3f548cfc6a1fe4c53479cf8a21931cdfd51d8 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 6.9","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.9 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.12.110 6.12.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.18.52 6.18.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.2.6 7.2.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.3-rc1 * original_commit_for_fix","platforms":[]}],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[],"vendor_comments":[],"enrichments":{"kev":null,"epss":null,"legacy_qids":[]},"source_records":{"cve_program":{"containers":{"cna":{"affected":[{"defaultStatus":"unaffected","product":"Linux","programFiles":["kernel/bpf/bpf_lsm.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"lessThan":"2135f661fae7160a7fc603cab43cbc7999e8bfce","status":"affected","version":"1b67772e4e3f16cd647b229cae95fc06d120be08","versionType":"git"},{"lessThan":"d5f2f741a900123fbcb7c7c0a002b81306fbe242","status":"affected","version":"1b67772e4e3f16cd647b229cae95fc06d120be08","versionType":"git"},{"lessThan":"915c2d9d69fc6c5f9f41d12bf4a9c51293aaee62","status":"affected","version":"1b67772e4e3f16cd647b229cae95fc06d120be08","versionType":"git"},{"lessThan":"2ce3f548cfc6a1fe4c53479cf8a21931cdfd51d8","status":"affected","version":"1b67772e4e3f16cd647b229cae95fc06d120be08","versionType":"git"}]},{"defaultStatus":"affected","product":"Linux","programFiles":["kernel/bpf/bpf_lsm.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"status":"affected","version":"6.9"},{"lessThan":"6.9","status":"unaffected","version":"0","versionType":"semver"},{"lessThanOrEqual":"6.12.*","status":"unaffected","version":"6.12.110","versionType":"semver"},{"lessThanOrEqual":"6.18.*","status":"unaffected","version":"6.18.52","versionType":"semver"},{"lessThanOrEqual":"7.2.*","status":"unaffected","version":"7.2.6","versionType":"semver"},{"lessThanOrEqual":"*","status":"unaffected","version":"7.3-rc1","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"cpeMatch":[{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.12.110","versionStartIncluding":"6.9","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.18.52","versionStartIncluding":"6.9","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.2.6","versionStartIncluding":"6.9","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.3-rc1","versionStartIncluding":"6.9","vulnerable":true}],"negate":false,"operator":"OR"}]}],"descriptions":[{"lang":"en","value":"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   <IRQ>\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   </IRQ>\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->aux->security, 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."}],"providerMetadata":{"dateUpdated":"2026-09-17T16:12:03.229Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"references":[{"url":"https://git.kernel.org/stable/c/2135f661fae7160a7fc603cab43cbc7999e8bfce"},{"url":"https://git.kernel.org/stable/c/d5f2f741a900123fbcb7c7c0a002b81306fbe242"},{"url":"https://git.kernel.org/stable/c/915c2d9d69fc6c5f9f41d12bf4a9c51293aaee62"},{"url":"https://git.kernel.org/stable/c/2ce3f548cfc6a1fe4c53479cf8a21931cdfd51d8"}],"title":"bpf,lsm: Drop bpf_prog_free from sleepable_lsm_hooks","x_generator":{"engine":"bippy-1.2.0"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2026-93173","datePublished":"2026-09-17T16:12:03.229Z","dateReserved":"2026-09-17T16:02:15.090Z","dateUpdated":"2026-09-17T16:12:03.229Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-09-17 17:18:13","lastModifiedDate":"2026-09-17 17:18:13","problem_types":[],"metrics":[],"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"93173","Ordinal":"1","Title":"bpf,lsm: Drop bpf_prog_free from sleepable_lsm_hooks","CVE":"CVE-2026-93173","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"93173","Ordinal":"1","NoteData":"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   <IRQ>\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   </IRQ>\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->aux->security, 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.","Type":"Description","Title":"bpf,lsm: Drop bpf_prog_free from sleepable_lsm_hooks"}]}}}