{"id":"CVE-2026-99136","state":"PUBLISHED","title":"dm-crypt: fix a tiny race condition in crypt_dec_pending","description":"In the Linux kernel, the following vulnerability has been resolved:\n\ndm-crypt: fix a tiny race condition in crypt_dec_pending\n\ncrypt_dec_pending reads io->error before calling atomic_dec_and_test.\nAnother context, for example crypt_endio called from an interrupt, may\nset io->error and drop its reference between the read and the\ndecrement. crypt_dec_pending then drops the last reference and completes\nthe bio with the stale status - so a read that failed and was never\ndecrypted, or a write that failed, is reported as successful.\n\nThe read was placed before the decrement by commit b35f8caa0890 (\"dm\ncrypt: wait for endio to complete before destruction\"), because that\ncommit freed dm_crypt_io before calling bio_endio. This is no longer the\ncase, dm_crypt_io lives in the per-bio data now.\n\nRead io->error after atomic_dec_and_test instead. atomic_dec_and_test is\nfully ordered, so no additional barrier is needed.","publishedAt":"2026-10-28T10:34:48.558Z","updatedAt":"2026-10-30T12:42:09.702Z","severity":null,"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"b35f8caa0890169000fec22902290d9a15274cbd","status":"affected","lessThan":"445a6883f46d3ab1ff545199a8cc1d5834936d3f","versionType":"git"},{"version":"b35f8caa0890169000fec22902290d9a15274cbd","status":"affected","lessThan":"6f82e86471c92fd874f2630c9a6af887f4ed1a77","versionType":"git"},{"version":"b35f8caa0890169000fec22902290d9a15274cbd","status":"affected","lessThan":"6ac8546df1f8a2b1ca7f6d67c269057a99fbbf8c","versionType":"git"},{"version":"b35f8caa0890169000fec22902290d9a15274cbd","status":"affected","lessThan":"056bf8322e39a48026df352d6227ec03dd8cd032","versionType":"git"},{"version":"b35f8caa0890169000fec22902290d9a15274cbd","status":"affected","lessThan":"d9d7069bb79139271b54dc477f07e242c445de6b","versionType":"git"},{"version":"b35f8caa0890169000fec22902290d9a15274cbd","status":"affected","lessThan":"ac5d887ab93592fc5e3605fe30c1d8d232d609b3","versionType":"git"},{"version":"b35f8caa0890169000fec22902290d9a15274cbd","status":"affected","lessThan":"4f16bb982b27b9f5a15301f622c318001fe521f8","versionType":"git"},{"version":"b35f8caa0890169000fec22902290d9a15274cbd","status":"affected","lessThan":"148845aa1921d95ef5dc851c76e6a284f6657df6","versionType":"git"},{"version":"9c8f3fcd3ffd3283cc0971c8919058356f20a963","status":"affected","versionType":"git"},{"version":"2.6.28.9","status":"affected","lessThan":"2.6.29","versionType":"semver"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/md/dm-crypt.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"2.6.29","status":"affected"},{"version":"0","status":"unaffected","lessThan":"2.6.29","versionType":"semver"},{"version":"5.10.273","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.224","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.191","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.161","status":"unaffected","lessThanOrEqual":"6.6.*","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":["drivers/md/dm-crypt.c"]}],"references":["https://git.kernel.org/stable/c/445a6883f46d3ab1ff545199a8cc1d5834936d3f","https://git.kernel.org/stable/c/6f82e86471c92fd874f2630c9a6af887f4ed1a77","https://git.kernel.org/stable/c/6ac8546df1f8a2b1ca7f6d67c269057a99fbbf8c","https://git.kernel.org/stable/c/056bf8322e39a48026df352d6227ec03dd8cd032","https://git.kernel.org/stable/c/d9d7069bb79139271b54dc477f07e242c445de6b","https://git.kernel.org/stable/c/ac5d887ab93592fc5e3605fe30c1d8d232d609b3","https://git.kernel.org/stable/c/4f16bb982b27b9f5a15301f622c318001fe521f8","https://git.kernel.org/stable/c/148845aa1921d95ef5dc851c76e6a284f6657df6"],"weaknesses":[],"ingestedAt":"2026-10-30T13:02:04.640Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/99xxx/CVE-2026-99136.json","commit":"cb14bf1b43b0c9f05f7f40eae2246263fd430780","baselineCommit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-99136","state":"PUBLISHED","datePublished":"2026-10-28T10:34:48.558Z","dateUpdated":"2026-10-30T12:42:09.702Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-09-25T10:25:14.395Z"},"containers":{"cna":{"title":"dm-crypt: fix a tiny race condition in crypt_dec_pending","descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\ndm-crypt: fix a tiny race condition in crypt_dec_pending\n\ncrypt_dec_pending reads io->error before calling atomic_dec_and_test.\nAnother context, for example crypt_endio called from an interrupt, may\nset io->error and drop its reference between the read and the\ndecrement. crypt_dec_pending then drops the last reference and completes\nthe bio with the stale status - so a read that failed and was never\ndecrypted, or a write that failed, is reported as successful.\n\nThe read was placed before the decrement by commit b35f8caa0890 (\"dm\ncrypt: wait for endio to complete before destruction\"), because that\ncommit freed dm_crypt_io before calling bio_endio. This is no longer the\ncase, dm_crypt_io lives in the per-bio data now.\n\nRead io->error after atomic_dec_and_test instead. atomic_dec_and_test is\nfully ordered, so no additional barrier is needed."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"b35f8caa0890169000fec22902290d9a15274cbd","status":"affected","lessThan":"445a6883f46d3ab1ff545199a8cc1d5834936d3f","versionType":"git"},{"version":"b35f8caa0890169000fec22902290d9a15274cbd","status":"affected","lessThan":"6f82e86471c92fd874f2630c9a6af887f4ed1a77","versionType":"git"},{"version":"b35f8caa0890169000fec22902290d9a15274cbd","status":"affected","lessThan":"6ac8546df1f8a2b1ca7f6d67c269057a99fbbf8c","versionType":"git"},{"version":"b35f8caa0890169000fec22902290d9a15274cbd","status":"affected","lessThan":"056bf8322e39a48026df352d6227ec03dd8cd032","versionType":"git"},{"version":"b35f8caa0890169000fec22902290d9a15274cbd","status":"affected","lessThan":"d9d7069bb79139271b54dc477f07e242c445de6b","versionType":"git"},{"version":"b35f8caa0890169000fec22902290d9a15274cbd","status":"affected","lessThan":"ac5d887ab93592fc5e3605fe30c1d8d232d609b3","versionType":"git"},{"version":"b35f8caa0890169000fec22902290d9a15274cbd","status":"affected","lessThan":"4f16bb982b27b9f5a15301f622c318001fe521f8","versionType":"git"},{"version":"b35f8caa0890169000fec22902290d9a15274cbd","status":"affected","lessThan":"148845aa1921d95ef5dc851c76e6a284f6657df6","versionType":"git"},{"version":"9c8f3fcd3ffd3283cc0971c8919058356f20a963","status":"affected","versionType":"git"},{"version":"2.6.28.9","status":"affected","lessThan":"2.6.29","versionType":"semver"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/md/dm-crypt.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"2.6.29","status":"affected"},{"version":"0","status":"unaffected","lessThan":"2.6.29","versionType":"semver"},{"version":"5.10.273","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.224","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.191","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.161","status":"unaffected","lessThanOrEqual":"6.6.*","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":["drivers/md/dm-crypt.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/445a6883f46d3ab1ff545199a8cc1d5834936d3f"},{"url":"https://git.kernel.org/stable/c/6f82e86471c92fd874f2630c9a6af887f4ed1a77"},{"url":"https://git.kernel.org/stable/c/6ac8546df1f8a2b1ca7f6d67c269057a99fbbf8c"},{"url":"https://git.kernel.org/stable/c/056bf8322e39a48026df352d6227ec03dd8cd032"},{"url":"https://git.kernel.org/stable/c/d9d7069bb79139271b54dc477f07e242c445de6b"},{"url":"https://git.kernel.org/stable/c/ac5d887ab93592fc5e3605fe30c1d8d232d609b3"},{"url":"https://git.kernel.org/stable/c/4f16bb982b27b9f5a15301f622c318001fe521f8"},{"url":"https://git.kernel.org/stable/c/148845aa1921d95ef5dc851c76e6a284f6657df6"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-10-30T12:42:09.702Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.29","versionEndExcluding":"5.10.273"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.29","versionEndExcluding":"5.15.224"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.29","versionEndExcluding":"6.1.191"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.29","versionEndExcluding":"6.6.161"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.29","versionEndExcluding":"6.12.115"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.29","versionEndExcluding":"6.18.59"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.29","versionEndExcluding":"7.2.13"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.29","versionEndExcluding":"7.3"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.28.9"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}}}}}