{"id":"CVE-2025-68329","state":"PUBLISHED","title":"tracing: Fix WARN_ON in tracing_buffers_mmap_close for split VMAs","description":"In the Linux kernel, the following vulnerability has been resolved:\n\ntracing: Fix WARN_ON in tracing_buffers_mmap_close for split VMAs\n\nWhen a VMA is split (e.g., by partial munmap or MAP_FIXED), the kernel\ncalls vm_ops->close on each portion. For trace buffer mappings, this\nresults in ring_buffer_unmap() being called multiple times while\nring_buffer_map() was only called once.\n\nThis causes ring_buffer_unmap() to return -ENODEV on subsequent calls\nbecause user_mapped is already 0, triggering a WARN_ON.\n\nTrace buffer mappings cannot support partial mappings because the ring\nbuffer structure requires the complete buffer including the meta page.\n\nFix this by adding a may_split callback that returns -EINVAL to prevent\nVMA splits entirely.","publishedAt":"2025-12-22T16:12:23.133Z","updatedAt":"2026-05-11T21:51:04.994Z","severity":null,"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"cf9f0f7c4c5bb45e7bb270e48bab6f7837825a64","status":"affected","lessThan":"922fdd0b755a84f9933b3ca195f60092b6bb88ee","versionType":"git"},{"version":"cf9f0f7c4c5bb45e7bb270e48bab6f7837825a64","status":"affected","lessThan":"45053c12c45f0fb8ef6ab95118dd928d2fec0255","versionType":"git"},{"version":"cf9f0f7c4c5bb45e7bb270e48bab6f7837825a64","status":"affected","lessThan":"b042fdf18e89a347177a49e795d8e5184778b5b6","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["kernel/trace/trace.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"6.10","status":"affected"},{"version":"0","status":"unaffected","lessThan":"6.10","versionType":"semver"},{"version":"6.12.61","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.17.11","status":"unaffected","lessThanOrEqual":"6.17.*","versionType":"semver"},{"version":"6.18","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["kernel/trace/trace.c"]}],"references":["https://git.kernel.org/stable/c/922fdd0b755a84f9933b3ca195f60092b6bb88ee","https://git.kernel.org/stable/c/45053c12c45f0fb8ef6ab95118dd928d2fec0255","https://git.kernel.org/stable/c/b042fdf18e89a347177a49e795d8e5184778b5b6"],"weaknesses":[],"ingestedAt":"2026-10-29T20:09:56.034Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2025/68xxx/CVE-2025-68329.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2025-68329","state":"PUBLISHED","datePublished":"2025-12-22T16:12:23.133Z","dateUpdated":"2026-05-11T21:51:04.994Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2025-12-16T14:48:05.296Z"},"containers":{"cna":{"title":"tracing: Fix WARN_ON in tracing_buffers_mmap_close for split VMAs","descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\ntracing: Fix WARN_ON in tracing_buffers_mmap_close for split VMAs\n\nWhen a VMA is split (e.g., by partial munmap or MAP_FIXED), the kernel\ncalls vm_ops->close on each portion. For trace buffer mappings, this\nresults in ring_buffer_unmap() being called multiple times while\nring_buffer_map() was only called once.\n\nThis causes ring_buffer_unmap() to return -ENODEV on subsequent calls\nbecause user_mapped is already 0, triggering a WARN_ON.\n\nTrace buffer mappings cannot support partial mappings because the ring\nbuffer structure requires the complete buffer including the meta page.\n\nFix this by adding a may_split callback that returns -EINVAL to prevent\nVMA splits entirely."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"cf9f0f7c4c5bb45e7bb270e48bab6f7837825a64","status":"affected","lessThan":"922fdd0b755a84f9933b3ca195f60092b6bb88ee","versionType":"git"},{"version":"cf9f0f7c4c5bb45e7bb270e48bab6f7837825a64","status":"affected","lessThan":"45053c12c45f0fb8ef6ab95118dd928d2fec0255","versionType":"git"},{"version":"cf9f0f7c4c5bb45e7bb270e48bab6f7837825a64","status":"affected","lessThan":"b042fdf18e89a347177a49e795d8e5184778b5b6","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["kernel/trace/trace.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"6.10","status":"affected"},{"version":"0","status":"unaffected","lessThan":"6.10","versionType":"semver"},{"version":"6.12.61","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.17.11","status":"unaffected","lessThanOrEqual":"6.17.*","versionType":"semver"},{"version":"6.18","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["kernel/trace/trace.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/922fdd0b755a84f9933b3ca195f60092b6bb88ee"},{"url":"https://git.kernel.org/stable/c/45053c12c45f0fb8ef6ab95118dd928d2fec0255"},{"url":"https://git.kernel.org/stable/c/b042fdf18e89a347177a49e795d8e5184778b5b6"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-05-11T21:51:04.994Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.10","versionEndExcluding":"6.12.61"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.10","versionEndExcluding":"6.17.11"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.10","versionEndExcluding":"6.18"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}}}}}