{"id":"CVE-2026-99160","state":"PUBLISHED","title":"ring-buffer: Do not show buffer_meta for CPUs without a buffer","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nring-buffer: Do not show buffer_meta for CPUs without a buffer\n\nThe per_cpu/cpuN/buffer_meta files are created for every possible CPU,\nbut buffer->buffers[cpu] is only allocated once that CPU comes online.\nReading the file of a CPU that never came online dereferences a NULL\ncpu_buffer in rbm_start().\n\nFail the open with -ENODEV when the CPU has no buffer, as the other\nper CPU ring buffer interfaces do.","publishedAt":"2026-10-28T10:35:13.341Z","updatedAt":"2026-10-30T12:42:26.948Z","severity":null,"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"950032ffcee7a43c960951940059afc5a2bdbcbc","status":"affected","lessThan":"445bc0e0ed7b3f69b78a0fd8d3a8fdb4e20bc379","versionType":"git"},{"version":"950032ffcee7a43c960951940059afc5a2bdbcbc","status":"affected","lessThan":"8512d0312cc0ea83ca4511b164c29a138bbb0c21","versionType":"git"},{"version":"950032ffcee7a43c960951940059afc5a2bdbcbc","status":"affected","lessThan":"ae670c1a24fb5ffb167f26358cf47a5f0abbd670","versionType":"git"},{"version":"950032ffcee7a43c960951940059afc5a2bdbcbc","status":"affected","lessThan":"3f23cae09a4677a3f7c163a68388512cb231ff22","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["kernel/trace/ring_buffer.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"6.12","status":"affected"},{"version":"0","status":"unaffected","lessThan":"6.12","versionType":"semver"},{"version":"6.12.115","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.59","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.2.13","status":"unaffected","lessThanOrEqual":"7.2.*","versionType":"semver"},{"version":"7.3","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["kernel/trace/ring_buffer.c"]}],"references":["https://git.kernel.org/stable/c/445bc0e0ed7b3f69b78a0fd8d3a8fdb4e20bc379","https://git.kernel.org/stable/c/8512d0312cc0ea83ca4511b164c29a138bbb0c21","https://git.kernel.org/stable/c/ae670c1a24fb5ffb167f26358cf47a5f0abbd670","https://git.kernel.org/stable/c/3f23cae09a4677a3f7c163a68388512cb231ff22"],"weaknesses":[],"ingestedAt":"2026-10-30T13:02:04.640Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/99xxx/CVE-2026-99160.json","commit":"cb14bf1b43b0c9f05f7f40eae2246263fd430780","baselineCommit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-99160","state":"PUBLISHED","datePublished":"2026-10-28T10:35:13.341Z","dateUpdated":"2026-10-30T12:42:26.948Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-09-25T10:25:14.397Z"},"containers":{"cna":{"title":"ring-buffer: Do not show buffer_meta for CPUs without a buffer","descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nring-buffer: Do not show buffer_meta for CPUs without a buffer\n\nThe per_cpu/cpuN/buffer_meta files are created for every possible CPU,\nbut buffer->buffers[cpu] is only allocated once that CPU comes online.\nReading the file of a CPU that never came online dereferences a NULL\ncpu_buffer in rbm_start().\n\nFail the open with -ENODEV when the CPU has no buffer, as the other\nper CPU ring buffer interfaces do."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"950032ffcee7a43c960951940059afc5a2bdbcbc","status":"affected","lessThan":"445bc0e0ed7b3f69b78a0fd8d3a8fdb4e20bc379","versionType":"git"},{"version":"950032ffcee7a43c960951940059afc5a2bdbcbc","status":"affected","lessThan":"8512d0312cc0ea83ca4511b164c29a138bbb0c21","versionType":"git"},{"version":"950032ffcee7a43c960951940059afc5a2bdbcbc","status":"affected","lessThan":"ae670c1a24fb5ffb167f26358cf47a5f0abbd670","versionType":"git"},{"version":"950032ffcee7a43c960951940059afc5a2bdbcbc","status":"affected","lessThan":"3f23cae09a4677a3f7c163a68388512cb231ff22","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["kernel/trace/ring_buffer.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"6.12","status":"affected"},{"version":"0","status":"unaffected","lessThan":"6.12","versionType":"semver"},{"version":"6.12.115","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.59","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.2.13","status":"unaffected","lessThanOrEqual":"7.2.*","versionType":"semver"},{"version":"7.3","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["kernel/trace/ring_buffer.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/445bc0e0ed7b3f69b78a0fd8d3a8fdb4e20bc379"},{"url":"https://git.kernel.org/stable/c/8512d0312cc0ea83ca4511b164c29a138bbb0c21"},{"url":"https://git.kernel.org/stable/c/ae670c1a24fb5ffb167f26358cf47a5f0abbd670"},{"url":"https://git.kernel.org/stable/c/3f23cae09a4677a3f7c163a68388512cb231ff22"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-10-30T12:42:26.948Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.12","versionEndExcluding":"6.12.115"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.12","versionEndExcluding":"6.18.59"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.12","versionEndExcluding":"7.2.13"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.12","versionEndExcluding":"7.3"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}}}}}