{"id":"CVE-2023-54173","title":"bpf: Disable preemption in bpf_event_output","summary":"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_e…","severity":"high","cvss":7.8,"cvssVector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","cvssSource":"cna","vendor":"Linux","product":"Linux","affected":["Linux >= 2a916f2f546ca1c1e3323e2a4269307f6d9890eb < 3048cb0dc0cc9dc74ed93690dffef00733bcad5b","Linux >= 2a916f2f546ca1c1e3323e2a4269307f6d9890eb < c81bdf8f9f2b002d217c3d5357cdea9f2b82ff90","Linux >= 2a916f2f546ca1c1e3323e2a4269307f6d9890eb < 36dd8ca330b76585640ed32255a3c99f901e1502","Linux >= 2a916f2f546ca1c1e3323e2a4269307f6d9890eb < 063c9ce8e74e07bf94f99cd13146f42867875e8b","Linux >= 2a916f2f546ca1c1e3323e2a4269307f6d9890eb < d62cc390c2e99ae267ffe4b8d7e2e08b6c758c32","Linux 5.7"],"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"total","timestamp":"2026-10-15T21:38:52.294746Z"},"published":"2025-12-30","updated":"2026-10-15","sourceUpdated":"2026-10-15T21:41:40.859Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2023-54173","references":[{"url":"https://git.kernel.org/stable/c/3048cb0dc0cc9dc74ed93690dffef00733bcad5b"},{"url":"https://git.kernel.org/stable/c/c81bdf8f9f2b002d217c3d5357cdea9f2b82ff90"},{"url":"https://git.kernel.org/stable/c/36dd8ca330b76585640ed32255a3c99f901e1502"},{"url":"https://git.kernel.org/stable/c/063c9ce8e74e07bf94f99cd13146f42867875e8b"},{"url":"https://git.kernel.org/stable/c/d62cc390c2e99ae267ffe4b8d7e2e08b6c758c32"}],"tags":["cve.org"],"epss":0.00154,"epssPercentile":0.04088,"ingestedAt":"2026-10-15T22:48:25.431Z","slug":"CVE-2023-54173","body":"## Overview\n\nIn 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\n\n## Affected\n\n- `Linux >= 2a916f2f546ca1c1e3323e2a4269307f6d9890eb < 3048cb0dc0cc9dc74ed93690dffef00733bcad5b`\n- `Linux >= 2a916f2f546ca1c1e3323e2a4269307f6d9890eb < c81bdf8f9f2b002d217c3d5357cdea9f2b82ff90`\n- `Linux >= 2a916f2f546ca1c1e3323e2a4269307f6d9890eb < 36dd8ca330b76585640ed32255a3c99f901e1502`\n- `Linux >= 2a916f2f546ca1c1e3323e2a4269307f6d9890eb < 063c9ce8e74e07bf94f99cd13146f42867875e8b`\n- `Linux >= 2a916f2f546ca1c1e3323e2a4269307f6d9890eb < d62cc390c2e99ae267ffe4b8d7e2e08b6c758c32`\n- `Linux 5.7`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"twilight","depthScore":43,"depthScoreParts":{"impact":42.9,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}