{"id":"CVE-2023-54173","summary":"bpf: Disable preemption in bpf_event_output","details":"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","modified":"2026-03-31T17:29:26.117308337Z","published":"2025-12-30T12:08:46.842Z","related":["SUSE-SU-2026:0263-1","SUSE-SU-2026:0278-1","SUSE-SU-2026:0281-1","SUSE-SU-2026:0293-1","SUSE-SU-2026:0315-1","SUSE-SU-2026:0317-1","SUSE-SU-2026:0411-1","SUSE-SU-2026:0617-1","SUSE-SU-2026:20477-1","SUSE-SU-2026:20498-1","SUSE-SU-2026:20845-1","SUSE-SU-2026:20876-1"],"database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2023/54xxx/CVE-2023-54173.json","cna_assigner":"Linux"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/063c9ce8e74e07bf94f99cd13146f42867875e8b"},{"type":"WEB","url":"https://git.kernel.org/stable/c/3048cb0dc0cc9dc74ed93690dffef00733bcad5b"},{"type":"WEB","url":"https://git.kernel.org/stable/c/36dd8ca330b76585640ed32255a3c99f901e1502"},{"type":"WEB","url":"https://git.kernel.org/stable/c/c81bdf8f9f2b002d217c3d5357cdea9f2b82ff90"},{"type":"WEB","url":"https://git.kernel.org/stable/c/d62cc390c2e99ae267ffe4b8d7e2e08b6c758c32"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2023/54xxx/CVE-2023-54173.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2023-54173"},{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"2a916f2f546ca1c1e3323e2a4269307f6d9890eb"},{"fixed":"3048cb0dc0cc9dc74ed93690dffef00733bcad5b"},{"fixed":"c81bdf8f9f2b002d217c3d5357cdea9f2b82ff90"},{"fixed":"36dd8ca330b76585640ed32255a3c99f901e1502"},{"fixed":"063c9ce8e74e07bf94f99cd13146f42867875e8b"},{"fixed":"d62cc390c2e99ae267ffe4b8d7e2e08b6c758c32"}]}],"database_specific":{"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2023-54173.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"5.7.0"},{"fixed":"5.10.190"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.11.0"},{"fixed":"5.15.126"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.16.0"},{"fixed":"6.1.45"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.2.0"},{"fixed":"6.4.10"}]}],"database_specific":{"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2023-54173.json"}}],"schema_version":"1.7.5"}