{"id":"CVE-2026-43272","state":"PUBLISHED","title":"ring-buffer: Fix possible dereference of uninitialized pointer","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nring-buffer: Fix possible dereference of uninitialized pointer\n\nThere is a pointer head_page in rb_meta_validate_events() which is not\ninitialized at the beginning of a function. This pointer can be dereferenced\nif there is a failure during reader page validation. In this case the control\nis passed to \"invalid\" label where the pointer is dereferenced in a loop.\n\nTo fix the issue initialize orig_head and head_page before calling\nrb_validate_buffer.\n\nFound by Linux Verification Center (linuxtesting.org) with SVACE.","publishedAt":"2026-05-06T11:28:56.162Z","updatedAt":"2026-10-21T12:40:28.662Z","severity":null,"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"5f3b6e839f3ceb8d6ef02231ba9b5aca71b8bf55","status":"affected","lessThan":"a4afdff9c715af50cf6c3f2dc601932c2cea17a2","versionType":"git"},{"version":"5f3b6e839f3ceb8d6ef02231ba9b5aca71b8bf55","status":"affected","lessThan":"bc77986f3cb7476637052edf2d87137fa39f153d","versionType":"git"},{"version":"5f3b6e839f3ceb8d6ef02231ba9b5aca71b8bf55","status":"affected","lessThan":"d9942396845fef2369478c157b26738fe07142f6","versionType":"git"},{"version":"5f3b6e839f3ceb8d6ef02231ba9b5aca71b8bf55","status":"affected","lessThan":"f1547779402c4cd67755c33616b7203baa88420b","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":"6.12.114","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.16","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"6.19.6","status":"unaffected","lessThanOrEqual":"6.19.*","versionType":"semver"},{"version":"7.0","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/a4afdff9c715af50cf6c3f2dc601932c2cea17a2","https://git.kernel.org/stable/c/bc77986f3cb7476637052edf2d87137fa39f153d","https://git.kernel.org/stable/c/d9942396845fef2369478c157b26738fe07142f6","https://git.kernel.org/stable/c/f1547779402c4cd67755c33616b7203baa88420b"],"weaknesses":[],"ingestedAt":"2026-10-29T20:11:57.932Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/43xxx/CVE-2026-43272.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-43272","state":"PUBLISHED","datePublished":"2026-05-06T11:28:56.162Z","dateUpdated":"2026-10-21T12:40:28.662Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-05-01T14:12:55.998Z"},"containers":{"cna":{"title":"ring-buffer: Fix possible dereference of uninitialized pointer","descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nring-buffer: Fix possible dereference of uninitialized pointer\n\nThere is a pointer head_page in rb_meta_validate_events() which is not\ninitialized at the beginning of a function. This pointer can be dereferenced\nif there is a failure during reader page validation. In this case the control\nis passed to \"invalid\" label where the pointer is dereferenced in a loop.\n\nTo fix the issue initialize orig_head and head_page before calling\nrb_validate_buffer.\n\nFound by Linux Verification Center (linuxtesting.org) with SVACE."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"5f3b6e839f3ceb8d6ef02231ba9b5aca71b8bf55","status":"affected","lessThan":"a4afdff9c715af50cf6c3f2dc601932c2cea17a2","versionType":"git"},{"version":"5f3b6e839f3ceb8d6ef02231ba9b5aca71b8bf55","status":"affected","lessThan":"bc77986f3cb7476637052edf2d87137fa39f153d","versionType":"git"},{"version":"5f3b6e839f3ceb8d6ef02231ba9b5aca71b8bf55","status":"affected","lessThan":"d9942396845fef2369478c157b26738fe07142f6","versionType":"git"},{"version":"5f3b6e839f3ceb8d6ef02231ba9b5aca71b8bf55","status":"affected","lessThan":"f1547779402c4cd67755c33616b7203baa88420b","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":"6.12.114","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.16","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"6.19.6","status":"unaffected","lessThanOrEqual":"6.19.*","versionType":"semver"},{"version":"7.0","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/a4afdff9c715af50cf6c3f2dc601932c2cea17a2"},{"url":"https://git.kernel.org/stable/c/bc77986f3cb7476637052edf2d87137fa39f153d"},{"url":"https://git.kernel.org/stable/c/d9942396845fef2369478c157b26738fe07142f6"},{"url":"https://git.kernel.org/stable/c/f1547779402c4cd67755c33616b7203baa88420b"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-10-21T12:40:28.662Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.12","versionEndExcluding":"6.12.114"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.12","versionEndExcluding":"6.18.16"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.12","versionEndExcluding":"6.19.6"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.12","versionEndExcluding":"7.0"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}}}}}