{"id":"CVE-2026-53320","state":"PUBLISHED","title":"nilfs2: reject zero bd_oblocknr in nilfs_ioctl_mark_blocks_dirty()","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nnilfs2: reject zero bd_oblocknr in nilfs_ioctl_mark_blocks_dirty()\n\nnilfs_ioctl_mark_blocks_dirty() uses bd_oblocknr to detect dead blocks\nby comparing it with the current block number bd_blocknr. If they differ,\nthe block is considered dead and skipped.\n\nHowever, bd_oblocknr should never be 0 since block 0 typically stores the\nprimary superblock and is never a valid GC target block. A corrupted ioctl\nrequest with bd_oblocknr set to 0 causes the comparison to incorrectly\nmatch when the lookup returns -ENOENT and sets bd_blocknr to 0, bypassing\nthe dead block check and calling nilfs_bmap_mark() on a non-existent\nblock. This causes nilfs_btree_do_lookup() to return -ENOENT, triggering\nthe WARN_ON(ret == -ENOENT).\n\nFix this by rejecting ioctl requests with bd_oblocknr set to 0 at the\nbeginning of each iteration.\n\n[ryusuke: slightly modified the commit message and comments for accuracy]","publishedAt":"2026-06-26T19:41:11.932Z","updatedAt":"2026-06-26T19:41:11.932Z","severity":null,"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"7942b919f7321f95a777d396ff7894a7a83dc9b0","status":"affected","lessThan":"e0a0c4903cbba351f0f5b5d104960d3a5b23202f","versionType":"git"},{"version":"7942b919f7321f95a777d396ff7894a7a83dc9b0","status":"affected","lessThan":"9472d37799a0b9ff9b99639f35961ac2f0b3c9be","versionType":"git"},{"version":"7942b919f7321f95a777d396ff7894a7a83dc9b0","status":"affected","lessThan":"65e07964b4b2daf9a54e686cf0fa72d74a9648a8","versionType":"git"},{"version":"7942b919f7321f95a777d396ff7894a7a83dc9b0","status":"affected","lessThan":"b88f905d4449b70da6bda547be546e365e44352e","versionType":"git"},{"version":"7942b919f7321f95a777d396ff7894a7a83dc9b0","status":"affected","lessThan":"4525658002be3ad310b16bf8db48c8adb6a55d32","versionType":"git"},{"version":"7942b919f7321f95a777d396ff7894a7a83dc9b0","status":"affected","lessThan":"e5ff0ba4b6983cdbcc826efc201e7179ece5d46f","versionType":"git"},{"version":"7942b919f7321f95a777d396ff7894a7a83dc9b0","status":"affected","lessThan":"94094e70fe292c9566502772d4d4d6d6a99204b1","versionType":"git"},{"version":"7942b919f7321f95a777d396ff7894a7a83dc9b0","status":"affected","lessThan":"be3e5d10643d3be1cbac9d9939f220a99253f980","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["fs/nilfs2/ioctl.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"2.6.30","status":"affected"},{"version":"0","status":"unaffected","lessThan":"2.6.30","versionType":"semver"},{"version":"5.10.258","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.209","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.175","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.141","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.91","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.33","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.0.10","status":"unaffected","lessThanOrEqual":"7.0.*","versionType":"semver"},{"version":"7.1","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["fs/nilfs2/ioctl.c"]}],"references":["https://git.kernel.org/stable/c/e0a0c4903cbba351f0f5b5d104960d3a5b23202f","https://git.kernel.org/stable/c/9472d37799a0b9ff9b99639f35961ac2f0b3c9be","https://git.kernel.org/stable/c/65e07964b4b2daf9a54e686cf0fa72d74a9648a8","https://git.kernel.org/stable/c/b88f905d4449b70da6bda547be546e365e44352e","https://git.kernel.org/stable/c/4525658002be3ad310b16bf8db48c8adb6a55d32","https://git.kernel.org/stable/c/e5ff0ba4b6983cdbcc826efc201e7179ece5d46f","https://git.kernel.org/stable/c/94094e70fe292c9566502772d4d4d6d6a99204b1","https://git.kernel.org/stable/c/be3e5d10643d3be1cbac9d9939f220a99253f980"],"weaknesses":[],"ingestedAt":"2026-10-29T20:12:16.098Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/53xxx/CVE-2026-53320.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-53320","state":"PUBLISHED","datePublished":"2026-06-26T19:41:11.932Z","dateUpdated":"2026-06-26T19:41:11.932Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-06-09T07:44:35.398Z"},"containers":{"cna":{"title":"nilfs2: reject zero bd_oblocknr in nilfs_ioctl_mark_blocks_dirty()","descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nnilfs2: reject zero bd_oblocknr in nilfs_ioctl_mark_blocks_dirty()\n\nnilfs_ioctl_mark_blocks_dirty() uses bd_oblocknr to detect dead blocks\nby comparing it with the current block number bd_blocknr. If they differ,\nthe block is considered dead and skipped.\n\nHowever, bd_oblocknr should never be 0 since block 0 typically stores the\nprimary superblock and is never a valid GC target block. A corrupted ioctl\nrequest with bd_oblocknr set to 0 causes the comparison to incorrectly\nmatch when the lookup returns -ENOENT and sets bd_blocknr to 0, bypassing\nthe dead block check and calling nilfs_bmap_mark() on a non-existent\nblock. This causes nilfs_btree_do_lookup() to return -ENOENT, triggering\nthe WARN_ON(ret == -ENOENT).\n\nFix this by rejecting ioctl requests with bd_oblocknr set to 0 at the\nbeginning of each iteration.\n\n[ryusuke: slightly modified the commit message and comments for accuracy]"}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"7942b919f7321f95a777d396ff7894a7a83dc9b0","status":"affected","lessThan":"e0a0c4903cbba351f0f5b5d104960d3a5b23202f","versionType":"git"},{"version":"7942b919f7321f95a777d396ff7894a7a83dc9b0","status":"affected","lessThan":"9472d37799a0b9ff9b99639f35961ac2f0b3c9be","versionType":"git"},{"version":"7942b919f7321f95a777d396ff7894a7a83dc9b0","status":"affected","lessThan":"65e07964b4b2daf9a54e686cf0fa72d74a9648a8","versionType":"git"},{"version":"7942b919f7321f95a777d396ff7894a7a83dc9b0","status":"affected","lessThan":"b88f905d4449b70da6bda547be546e365e44352e","versionType":"git"},{"version":"7942b919f7321f95a777d396ff7894a7a83dc9b0","status":"affected","lessThan":"4525658002be3ad310b16bf8db48c8adb6a55d32","versionType":"git"},{"version":"7942b919f7321f95a777d396ff7894a7a83dc9b0","status":"affected","lessThan":"e5ff0ba4b6983cdbcc826efc201e7179ece5d46f","versionType":"git"},{"version":"7942b919f7321f95a777d396ff7894a7a83dc9b0","status":"affected","lessThan":"94094e70fe292c9566502772d4d4d6d6a99204b1","versionType":"git"},{"version":"7942b919f7321f95a777d396ff7894a7a83dc9b0","status":"affected","lessThan":"be3e5d10643d3be1cbac9d9939f220a99253f980","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["fs/nilfs2/ioctl.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"2.6.30","status":"affected"},{"version":"0","status":"unaffected","lessThan":"2.6.30","versionType":"semver"},{"version":"5.10.258","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.209","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.175","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.141","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.91","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.33","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.0.10","status":"unaffected","lessThanOrEqual":"7.0.*","versionType":"semver"},{"version":"7.1","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["fs/nilfs2/ioctl.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/e0a0c4903cbba351f0f5b5d104960d3a5b23202f"},{"url":"https://git.kernel.org/stable/c/9472d37799a0b9ff9b99639f35961ac2f0b3c9be"},{"url":"https://git.kernel.org/stable/c/65e07964b4b2daf9a54e686cf0fa72d74a9648a8"},{"url":"https://git.kernel.org/stable/c/b88f905d4449b70da6bda547be546e365e44352e"},{"url":"https://git.kernel.org/stable/c/4525658002be3ad310b16bf8db48c8adb6a55d32"},{"url":"https://git.kernel.org/stable/c/e5ff0ba4b6983cdbcc826efc201e7179ece5d46f"},{"url":"https://git.kernel.org/stable/c/94094e70fe292c9566502772d4d4d6d6a99204b1"},{"url":"https://git.kernel.org/stable/c/be3e5d10643d3be1cbac9d9939f220a99253f980"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-06-26T19:41:11.932Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.30","versionEndExcluding":"5.10.258"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.30","versionEndExcluding":"5.15.209"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.30","versionEndExcluding":"6.1.175"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.30","versionEndExcluding":"6.6.141"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.30","versionEndExcluding":"6.12.91"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.30","versionEndExcluding":"6.18.33"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.30","versionEndExcluding":"7.0.10"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.30","versionEndExcluding":"7.1"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}}}}}