{"id":"CVE-2026-92494","state":"PUBLISHED","title":"ext4: fix buffer_head leak in ext4_init_orphan_info","description":"In the Linux kernel, the following vulnerability has been resolved:\n\next4: fix buffer_head leak in ext4_init_orphan_info\n\next4_init_orphan_info() reads orphan file blocks with ext4_bread()\nand stores the returned buffer_head in oi->of_binfo[i].ob_bh.\n\nIf ext4_bread() succeeds but the orphan block magic or checksum\nvalidation fails, the function jumps to out_free. However, the old\nout_free loop starts releasing buffers from i - 1, so the current\nbuffer_head at index i is skipped.\n\nThis leaks the buffer_head reference obtained by ext4_bread() on the\nbad magic and bad checksum error paths.\n\nFix this by tracking the number of successfully read buffer_heads and\nreleasing exactly those buffer_heads on the error path.","publishedAt":"2026-09-17T16:10:10.073Z","updatedAt":"2026-10-19T09:04:00.500Z","severity":null,"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"02f310fcf47fa9311d6ba2946a8d19e7d7d11f37","status":"affected","lessThan":"a9a6ec1298f9bc134b2c5db27d25bb10603b7113","versionType":"git"},{"version":"02f310fcf47fa9311d6ba2946a8d19e7d7d11f37","status":"affected","lessThan":"35fc83c65faf7949f5701bb34b20f822560a7718","versionType":"git"},{"version":"02f310fcf47fa9311d6ba2946a8d19e7d7d11f37","status":"affected","lessThan":"74637f7fef030e5fb2e835b7dfeb05efdc48e0fe","versionType":"git"},{"version":"02f310fcf47fa9311d6ba2946a8d19e7d7d11f37","status":"affected","lessThan":"6ec53ccab0d691b3c73e03d930343ca45987e88d","versionType":"git"},{"version":"02f310fcf47fa9311d6ba2946a8d19e7d7d11f37","status":"affected","lessThan":"1399f102d8a1855c1a38506057306ec79d0787d9","versionType":"git"},{"version":"02f310fcf47fa9311d6ba2946a8d19e7d7d11f37","status":"affected","lessThan":"e1e342d9a561c016b8531ec1f4dcefaad9d64954","versionType":"git"},{"version":"02f310fcf47fa9311d6ba2946a8d19e7d7d11f37","status":"affected","lessThan":"05704335803b69c1bfa8637b7ada942bf2ee8a41","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["fs/ext4/orphan.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"5.15","status":"affected"},{"version":"0","status":"unaffected","lessThan":"5.15","versionType":"semver"},{"version":"5.15.221","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.188","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.157","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.110","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.52","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.2.6","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":["fs/ext4/orphan.c"]}],"references":["https://git.kernel.org/stable/c/a9a6ec1298f9bc134b2c5db27d25bb10603b7113","https://git.kernel.org/stable/c/35fc83c65faf7949f5701bb34b20f822560a7718","https://git.kernel.org/stable/c/74637f7fef030e5fb2e835b7dfeb05efdc48e0fe","https://git.kernel.org/stable/c/6ec53ccab0d691b3c73e03d930343ca45987e88d","https://git.kernel.org/stable/c/1399f102d8a1855c1a38506057306ec79d0787d9","https://git.kernel.org/stable/c/e1e342d9a561c016b8531ec1f4dcefaad9d64954","https://git.kernel.org/stable/c/05704335803b69c1bfa8637b7ada942bf2ee8a41"],"weaknesses":[],"ingestedAt":"2026-10-29T20:13:34.582Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/92xxx/CVE-2026-92494.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-92494","state":"PUBLISHED","datePublished":"2026-09-17T16:10:10.073Z","dateUpdated":"2026-10-19T09:04:00.500Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-09-16T12:21:13.871Z"},"containers":{"cna":{"title":"ext4: fix buffer_head leak in ext4_init_orphan_info","descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\next4: fix buffer_head leak in ext4_init_orphan_info\n\next4_init_orphan_info() reads orphan file blocks with ext4_bread()\nand stores the returned buffer_head in oi->of_binfo[i].ob_bh.\n\nIf ext4_bread() succeeds but the orphan block magic or checksum\nvalidation fails, the function jumps to out_free. However, the old\nout_free loop starts releasing buffers from i - 1, so the current\nbuffer_head at index i is skipped.\n\nThis leaks the buffer_head reference obtained by ext4_bread() on the\nbad magic and bad checksum error paths.\n\nFix this by tracking the number of successfully read buffer_heads and\nreleasing exactly those buffer_heads on the error path."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"02f310fcf47fa9311d6ba2946a8d19e7d7d11f37","status":"affected","lessThan":"a9a6ec1298f9bc134b2c5db27d25bb10603b7113","versionType":"git"},{"version":"02f310fcf47fa9311d6ba2946a8d19e7d7d11f37","status":"affected","lessThan":"35fc83c65faf7949f5701bb34b20f822560a7718","versionType":"git"},{"version":"02f310fcf47fa9311d6ba2946a8d19e7d7d11f37","status":"affected","lessThan":"74637f7fef030e5fb2e835b7dfeb05efdc48e0fe","versionType":"git"},{"version":"02f310fcf47fa9311d6ba2946a8d19e7d7d11f37","status":"affected","lessThan":"6ec53ccab0d691b3c73e03d930343ca45987e88d","versionType":"git"},{"version":"02f310fcf47fa9311d6ba2946a8d19e7d7d11f37","status":"affected","lessThan":"1399f102d8a1855c1a38506057306ec79d0787d9","versionType":"git"},{"version":"02f310fcf47fa9311d6ba2946a8d19e7d7d11f37","status":"affected","lessThan":"e1e342d9a561c016b8531ec1f4dcefaad9d64954","versionType":"git"},{"version":"02f310fcf47fa9311d6ba2946a8d19e7d7d11f37","status":"affected","lessThan":"05704335803b69c1bfa8637b7ada942bf2ee8a41","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["fs/ext4/orphan.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"5.15","status":"affected"},{"version":"0","status":"unaffected","lessThan":"5.15","versionType":"semver"},{"version":"5.15.221","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.188","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.157","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.110","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.52","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.2.6","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":["fs/ext4/orphan.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/a9a6ec1298f9bc134b2c5db27d25bb10603b7113"},{"url":"https://git.kernel.org/stable/c/35fc83c65faf7949f5701bb34b20f822560a7718"},{"url":"https://git.kernel.org/stable/c/74637f7fef030e5fb2e835b7dfeb05efdc48e0fe"},{"url":"https://git.kernel.org/stable/c/6ec53ccab0d691b3c73e03d930343ca45987e88d"},{"url":"https://git.kernel.org/stable/c/1399f102d8a1855c1a38506057306ec79d0787d9"},{"url":"https://git.kernel.org/stable/c/e1e342d9a561c016b8531ec1f4dcefaad9d64954"},{"url":"https://git.kernel.org/stable/c/05704335803b69c1bfa8637b7ada942bf2ee8a41"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-10-19T09:04:00.500Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.15","versionEndExcluding":"5.15.221"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.15","versionEndExcluding":"6.1.188"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.15","versionEndExcluding":"6.6.157"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.15","versionEndExcluding":"6.12.110"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.15","versionEndExcluding":"6.18.52"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.15","versionEndExcluding":"7.2.6"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.15","versionEndExcluding":"7.3"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}}}}}