{ "schemaVersion": 1, "attribution": [ { "source": "CISA Known Exploited Vulnerabilities", "url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog", "licence": "US government work" }, { "source": "GitHub Advisory Database", "url": "https://github.com/advisories", "licence": "CC BY 4.0" }, { "source": "Have I Been Pwned", "url": "https://haveibeenpwned.com/", "licence": "CC BY 4.0" }, { "source": "CVE Program (CVE records)", "url": "https://www.cve.org/Legal/TermsOfUse", "licence": "CVE Terms of Use", "notice": "Copyright © 1999-2026, The MITRE Corporation. CVE is a trademark and the CVE logo is a registered trademark of The MITRE Corporation.", "terms": "CVE Usage: MITRE hereby grants you a perpetual, worldwide, non-exclusive, no-charge, royalty-free, irrevocable copyright license to reproduce, prepare derivative works of, publicly display, publicly perform, sublicense, and distribute Common Vulnerabilities and Exposures (CVE™). Any copy you make for such purposes is authorized provided that you reproduce MITRE's copyright designation and this license in any such copy." }, { "source": "FIRST EPSS", "url": "https://www.first.org/epss/", "licence": "free to use; FIRST requests attribution" } ], "record": { "id": "CVE-2023-53368", "sourceURL": "https://www.cve.org/CVERecord?id=CVE-2023-53368", "idYear": 2023, "status": "PUBLISHED", "publishedAt": "2025-09-17T14:56:56.752Z", "updatedAt": "2026-05-11T19:43:35.800Z", "importedAt": "2026-10-24T01:57:03.413Z", "snapshot": { "id": "cve_2026-10-24_midnight_baseline", "at": "2026-10-24T00:00:00.000Z", "source": "https://github.com/CVEProject/cvelistV5/releases/tag/cve_2026-10-24_0100Z" }, "facts": { "title": "tracing: Fix race issue between cpu buffer write and swap", "summary": "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": [ { "vendor": "Linux", "product": "Linux", "defaultStatus": "unaffected", "versions": [ { "version": "f1affcaaa861f27752a769f889bf1486ebd301fe", "status": "affected", "versionType": "git", "lessThan": "90e037cabc2c2dfc39b3dd9c5b22ea91f995539a" }, { "version": "f1affcaaa861f27752a769f889bf1486ebd301fe", "status": "affected", "versionType": "git", "lessThan": "c5d30d6aa83d99fba8dfdd9cf6c4e4e7a63244db" }, { "version": "f1affcaaa861f27752a769f889bf1486ebd301fe", "status": "affected", "versionType": "git", "lessThan": "6182318ac04648b46db9d441fd7d696337fcdd0b" }, { "version": "f1affcaaa861f27752a769f889bf1486ebd301fe", "status": "affected", "versionType": "git", "lessThan": "74c85396bd73eca80b96510b4edf93b9a3aff75f" }, { "version": "f1affcaaa861f27752a769f889bf1486ebd301fe", "status": "affected", "versionType": "git", "lessThan": "89c89da92a60028013f9539be0dcce7e44405a43" }, { "version": "f1affcaaa861f27752a769f889bf1486ebd301fe", "status": "affected", "versionType": "git", "lessThan": "37ca1b686078b00cc4ffa008e2190615f7709b5d" }, { "version": "f1affcaaa861f27752a769f889bf1486ebd301fe", "status": "affected", "versionType": "git", "lessThan": "3163f635b20e9e1fb4659e74f47918c9dddfe64e" } ] }, { "vendor": "Linux", "product": "Linux", "defaultStatus": "affected", "versions": [ { "version": "3.10", "status": "affected" }, { "version": "0", "status": "unaffected", "versionType": "semver", "lessThan": "3.10" }, { "version": "5.4.257", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "5.4.*" }, { "version": "5.10.195", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "5.10.*" }, { "version": "5.15.132", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "5.15.*" }, { "version": "6.1.53", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "6.1.*" }, { "version": "6.4.16", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "6.4.*" }, { "version": "6.5.3", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "6.5.*" }, { "version": "6.6", "status": "unaffected", "versionType": "original_commit_for_fix", "lessThanOrEqual": "*" } ] } ] } } }