{"id":"CVE-2023-54173","revision":"437fdb3b47f74f589a138035dba56e82","records":[{"revision":"437fdb3b47f74f589a138035dba56e82","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2023-54173","aliases":[],"title":"bpf: Disable preemption in bpf_event_output","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: Disable preemption in bpf_event_output\n\nWe received report [1] of kernel crash, which is caused by\nusing nesting protection without disabled preemption.\n\nThe bpf_event_output can be called by programs executed by\nbpf_prog_run_array_cg function that disabled migration but\nkeeps preemption enabled.\n\nThis can cause task to be preempted by another one inside the\nnesting protection and lead eventually to two tasks using same\nperf_sample_data buffer and cause crashes like:\n\n  BUG: kernel NULL pointer dereference, address: 0000000000000001\n  #PF: supervisor instruction fetch in kernel mode\n  #PF: error_code(0x0010) - not-present page\n  ...\n  ? perf_output_sample+0x12a/0x9a0\n  ? finish_task_switch.isra.0+0x81/0x280\n  ? perf_event_output+0x66/0xa0\n  ? bpf_event_output+0x13a/0x190\n  ? bpf_event_output_data+0x22/0x40\n  ? bpf_prog_dfc84bbde731b257_cil_sock4_connect+0x40a/0xacb\n  ? xa_load+0x87/0xe0\n  ? __cgroup_bpf_run_filter_sock_addr+0xc1/0x1a0\n  ? release_sock+0x3e/0x90\n  ? sk_setsockopt+0x1a1/0x12f0\n  ? udp_pre_connect+0x36/0x50\n  ? inet_dgram_connect+0x93/0xa0\n  ? __sys_connect+0xb4/0xe0\n  ? udp_setsockopt+0x27/0x40\n  ? __pfx_udp_push_pending_frames+0x10/0x10\n  ? __sys_setsockopt+0xdf/0x1a0\n  ? __x64_sys_connect+0xf/0x20\n  ? do_syscall_64+0x3a/0x90\n  ? entry_SYSCALL_64_after_hwframe+0x72/0xdc\n\nFixing this by disabling preemption in bpf_event_output.\n\n[1] https://github.com/cilium/cilium/issues/26756","state":0,"publishedAt":"2025-12-30T12:08:46.842+00:00","modifiedAt":"2026-10-15T21:41:40.859+00:00","affected":[{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"product\": \"Linux\",\n                    \"vendor\": \"Linux\",\n                    \"defaultStatus\": \"unaffected\",\n                    \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n                    \"programFiles\": [\n                        \"kernel/trace/bpf_trace.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"2a916f2f546ca1c1e3323e2a4269307f6d9890eb\",\n                            \"lessThan\": \"3048cb0dc0cc9dc74ed93690dffef00733bcad5b\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"2a916f2f546ca1c1e3323e2a4269307f6d9890eb\",\n                            \"lessThan\": \"c81bdf8f9f2b002d217c3d5357cdea9f2b82ff90\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"2a916f2f546ca1c1e3323e2a4269307f6d9890eb\",\n                            \"lessThan\": \"36dd8ca330b76585640ed32255a3c99f901e1502\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"2a916f2f546ca1c1e3323e2a4269307f6d9890eb\",\n                            \"lessThan\": \"063c9ce8e74e07bf94f99cd13146f42867875e8b\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"2a916f2f546ca1c1e3323e2a4269307f6d9890eb\",\n                            \"lessThan\": \"d62cc390c2e99ae267ffe4b8d7e2e08b6c758c32\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        }\n                    ]\n                }"},{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"product\": \"Linux\",\n                    \"vendor\": \"Linux\",\n                    \"defaultStatus\": \"affected\",\n                    \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n                    \"programFiles\": [\n                        \"kernel/trace/bpf_trace.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"5.7\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"0\",\n                            \"lessThan\": \"5.7\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"5.10.190\",\n                            \"lessThanOrEqual\": \"5.10.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"5.15.126\",\n                            \"lessThanOrEqual\": \"5.15.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.1.45\",\n                            \"lessThanOrEqual\": \"6.1.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.4.10\",\n                            \"lessThanOrEqual\": \"6.4.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.5\",\n                            \"lessThanOrEqual\": \"*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"original_commit_for_fix\"\n                        }\n                    ]\n                }"}],"metrics":[{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","score":7.8,"severity":"HIGH"}],"references":["https://git.kernel.org/stable/c/3048cb0dc0cc9dc74ed93690dffef00733bcad5b","https://git.kernel.org/stable/c/c81bdf8f9f2b002d217c3d5357cdea9f2b82ff90","https://git.kernel.org/stable/c/36dd8ca330b76585640ed32255a3c99f901e1502","https://git.kernel.org/stable/c/063c9ce8e74e07bf94f99cd13146f42867875e8b","https://git.kernel.org/stable/c/d62cc390c2e99ae267ffe4b8d7e2e08b6c758c32"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2023-54173","license":"CVE Program Terms of Use","key":"cve-program:CVE-2023-54173","identifiers":["CVE-2023-54173"]},"retained":false,"historicalAffected":[]}],"coverage":[]}