{"schema_version":"1.9.0","id":"CVE-2023-53368","published":"2025-09-17T14:56:56.752Z","modified":"2026-08-12T03:51:49.376418849Z","related":["SUSE-SU-2025:03600-1","SUSE-SU-2025:03614-1","SUSE-SU-2025:03615-1","SUSE-SU-2025:03628-1","SUSE-SU-2025:03634-1","SUSE-SU-2025:20851-1","SUSE-SU-2025:20861-1","SUSE-SU-2025:20870-1","SUSE-SU-2025:20898-1","SUSE-SU-2025:3716-1","SUSE-SU-2025:3751-1","SUSE-SU-2025:3761-1","SUSE-SU-2025:4057-1","SUSE-SU-2025:4132-1","SUSE-SU-2025:4141-1"],"summary":"tracing: Fix race issue between cpu buffer write and swap","details":"In the Linux kernel, the following vulnerability has been resolved:\n\ntracing: Fix race issue between cpu buffer write and swap\n\nWarning happened in rb_end_commit() at code:\n\tif (RB_WARN_ON(cpu_buffer, !local_read(&cpu_buffer->committing)))\n\n  WARNING: CPU: 0 PID: 139 at kernel/trace/ring_buffer.c:3142\n\trb_commit+0x402/0x4a0\n  Call Trace:\n   ring_buffer_unlock_commit+0x42/0x250\n   trace_buffer_unlock_commit_regs+0x3b/0x250\n   trace_event_buffer_commit+0xe5/0x440\n   trace_event_buffer_reserve+0x11c/0x150\n   trace_event_raw_event_sched_switch+0x23c/0x2c0\n   __traceiter_sched_switch+0x59/0x80\n   __schedule+0x72b/0x1580\n   schedule+0x92/0x120\n   worker_thread+0xa0/0x6f0\n\nIt is because the race between writing event into cpu buffer and swapping\ncpu buffer through file per_cpu/cpu0/snapshot:\n\n  Write on CPU 0             Swap buffer by per_cpu/cpu0/snapshot on CPU 1\n  --------                   --------\n                             tracing_snapshot_write()\n                               [...]\n\n  ring_buffer_lock_reserve()\n    cpu_buffer = buffer->buffers[cpu]; // 1. Suppose find 'cpu_buffer_a';\n    [...]\n    rb_reserve_next_event()\n      [...]\n\n                               ring_buffer_swap_cpu()\n                                 if (local_read(&cpu_buffer_a->committing))\n                                     goto out_dec;\n                                 if (local_read(&cpu_buffer_b->committing))\n                                     goto out_dec;\n                                 buffer_a->buffers[cpu] = cpu_buffer_b;\n                                 buffer_b->buffers[cpu] = cpu_buffer_a;\n                                 // 2. cpu_buffer has swapped here.\n\n      rb_start_commit(cpu_buffer);\n      if (unlikely(READ_ONCE(cpu_buffer->buffer)\n          != buffer)) { // 3. This check passed due to 'cpu_buffer->buffer'\n        [...]           //    has not changed here.\n        return NULL;\n      }\n                                 cpu_buffer_b->buffer = buffer_a;\n                                 cpu_buffer_a->buffer = buffer_b;\n                                 [...]\n\n      // 4. Reserve event from 'cpu_buffer_a'.\n\n  ring_buffer_unlock_commit()\n    [...]\n    cpu_buffer = buffer->buffers[cpu]; // 5. Now find 'cpu_buffer_b' !!!\n    rb_commit(cpu_buffer)\n      rb_end_commit()  // 6. WARN for the wrong 'committing' state !!!\n\nBased on above analysis, we can easily reproduce by following testcase:\n  ``` bash\n  #!/bin/bash\n\n  dmesg -n 7\n  sysctl -w kernel.panic_on_warn=1\n  TR=/sys/kernel/tracing\n  echo 7 > ${TR}/buffer_size_kb\n  echo \"sched:sched_switch\" > ${TR}/set_event\n  while [ true ]; do\n          echo 1 > ${TR}/per_cpu/cpu0/snapshot\n  done &\n  while [ true ]; do\n          echo 1 > ${TR}/per_cpu/cpu0/snapshot\n  done &\n  while [ true ]; do\n          echo 1 > ${TR}/per_cpu/cpu0/snapshot\n  done &\n  ```\n\nTo fix it, IIUC, we can use smp_call_function_single() to do the swap on\nthe target cpu where the buffer is located, so that above race would be\navoided.","affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"f1affcaaa861f27752a769f889bf1486ebd301fe"},{"fixed":"90e037cabc2c2dfc39b3dd9c5b22ea91f995539a"},{"fixed":"c5d30d6aa83d99fba8dfdd9cf6c4e4e7a63244db"},{"fixed":"6182318ac04648b46db9d441fd7d696337fcdd0b"},{"fixed":"74c85396bd73eca80b96510b4edf93b9a3aff75f"},{"fixed":"89c89da92a60028013f9539be0dcce7e44405a43"},{"fixed":"37ca1b686078b00cc4ffa008e2190615f7709b5d"},{"fixed":"3163f635b20e9e1fb4659e74f47918c9dddfe64e"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2023-53368.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"3.10.0"},{"fixed":"5.4.257"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.5.0"},{"fixed":"5.10.195"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.11.0"},{"fixed":"5.15.132"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.16.0"},{"fixed":"6.1.53"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.2.0"},{"fixed":"6.4.16"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.5.0"},{"fixed":"6.5.3"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2023-53368.json"}}],"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/3163f635b20e9e1fb4659e74f47918c9dddfe64e"},{"type":"WEB","url":"https://git.kernel.org/stable/c/37ca1b686078b00cc4ffa008e2190615f7709b5d"},{"type":"WEB","url":"https://git.kernel.org/stable/c/6182318ac04648b46db9d441fd7d696337fcdd0b"},{"type":"WEB","url":"https://git.kernel.org/stable/c/74c85396bd73eca80b96510b4edf93b9a3aff75f"},{"type":"WEB","url":"https://git.kernel.org/stable/c/89c89da92a60028013f9539be0dcce7e44405a43"},{"type":"WEB","url":"https://git.kernel.org/stable/c/90e037cabc2c2dfc39b3dd9c5b22ea91f995539a"},{"type":"WEB","url":"https://git.kernel.org/stable/c/c5d30d6aa83d99fba8dfdd9cf6c4e4e7a63244db"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2023/53xxx/CVE-2023-53368.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2023-53368"},{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"}],"database_specific":{"cna_assigner":"Linux","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2023/53xxx/CVE-2023-53368.json"},"severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H"}]}