{"dataType":"CVE_RECORD","cveMetadata":{"cveId":"CVE-2024-26956","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","state":"PUBLISHED","assignerShortName":"Linux","dateReserved":"2024-02-19T14:20:24.200Z","datePublished":"2024-05-01T05:18:56.101Z","dateUpdated":"2026-05-11T20:07:38.180Z"},"containers":{"cna":{"providerMetadata":{"orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux","dateUpdated":"2026-05-11T20:07:38.180Z"},"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nnilfs2: fix failure to detect DAT corruption in btree and direct mappings\n\nPatch series \"nilfs2: fix kernel bug at submit_bh_wbc()\".\n\nThis resolves a kernel BUG reported by syzbot.  Since there are two\nflaws involved, I've made each one a separate patch.\n\nThe first patch alone resolves the syzbot-reported bug, but I think\nboth fixes should be sent to stable, so I've tagged them as such.\n\n\nThis patch (of 2):\n\nSyzbot has reported a kernel bug in submit_bh_wbc() when writing file data\nto a nilfs2 file system whose metadata is corrupted.\n\nThere are two flaws involved in this issue.\n\nThe first flaw is that when nilfs_get_block() locates a data block using\nbtree or direct mapping, if the disk address translation routine\nnilfs_dat_translate() fails with internal code -ENOENT due to DAT metadata\ncorruption, it can be passed back to nilfs_get_block().  This causes\nnilfs_get_block() to misidentify an existing block as non-existent,\ncausing both data block lookup and insertion to fail inconsistently.\n\nThe second flaw is that nilfs_get_block() returns a successful status in\nthis inconsistent state.  This causes the caller __block_write_begin_int()\nor others to request a read even though the buffer is not mapped,\nresulting in a BUG_ON check for the BH_Mapped flag in submit_bh_wbc()\nfailing.\n\nThis fixes the first issue by changing the return value to code -EINVAL\nwhen a conversion using DAT fails with code -ENOENT, avoiding the\nconflicting condition that leads to the kernel bug described above.  Here,\ncode -EINVAL indicates that metadata corruption was detected during the\nblock lookup, which will be properly handled as a file system error and\nconverted to -EIO when passing through the nilfs2 bmap layer."}],"affected":[{"product":"Linux","vendor":"Linux","defaultStatus":"unaffected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["fs/nilfs2/btree.c","fs/nilfs2/direct.c"],"versions":[{"version":"c3a7abf06ce719a51139e62a034590be99abbc2c","lessThan":"b67189690eb4b7ecc84ae16fa1e880e0123eaa35","status":"affected","versionType":"git"},{"version":"c3a7abf06ce719a51139e62a034590be99abbc2c","lessThan":"9cbe1ad5f4354f4df1445e5f4883983328cd6d8e","status":"affected","versionType":"git"},{"version":"c3a7abf06ce719a51139e62a034590be99abbc2c","lessThan":"c3b5c5c31e723b568f83d8cafab8629d9d830ffb","status":"affected","versionType":"git"},{"version":"c3a7abf06ce719a51139e62a034590be99abbc2c","lessThan":"2e2619ff5d0def4bb6c2037a32a6eaa28dd95c84","status":"affected","versionType":"git"},{"version":"c3a7abf06ce719a51139e62a034590be99abbc2c","lessThan":"46b832e09d43b394ac0f6d9485d2b1a06593f0b7","status":"affected","versionType":"git"},{"version":"c3a7abf06ce719a51139e62a034590be99abbc2c","lessThan":"f69e81396aea66304d214f175aa371f1b5578862","status":"affected","versionType":"git"},{"version":"c3a7abf06ce719a51139e62a034590be99abbc2c","lessThan":"a8e4d098de1c0f4c5c1f2ed4633a860f0da6d713","status":"affected","versionType":"git"},{"version":"c3a7abf06ce719a51139e62a034590be99abbc2c","lessThan":"82827ca21e7c8a91384c5baa656f78a5adfa4ab4","status":"affected","versionType":"git"},{"version":"c3a7abf06ce719a51139e62a034590be99abbc2c","lessThan":"f2f26b4a84a0ef41791bd2d70861c8eac748f4ba","status":"affected","versionType":"git"}]},{"product":"Linux","vendor":"Linux","defaultStatus":"affected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["fs/nilfs2/btree.c","fs/nilfs2/direct.c"],"versions":[{"version":"2.6.31","status":"affected"},{"version":"0","lessThan":"2.6.31","status":"unaffected","versionType":"semver"},{"version":"4.19.312","lessThanOrEqual":"4.19.*","status":"unaffected","versionType":"semver"},{"version":"5.4.274","lessThanOrEqual":"5.4.*","status":"unaffected","versionType":"semver"},{"version":"5.10.215","lessThanOrEqual":"5.10.*","status":"unaffected","versionType":"semver"},{"version":"5.15.154","lessThanOrEqual":"5.15.*","status":"unaffected","versionType":"semver"},{"version":"6.1.84","lessThanOrEqual":"6.1.*","status":"unaffected","versionType":"semver"},{"version":"6.6.24","lessThanOrEqual":"6.6.*","status":"unaffected","versionType":"semver"},{"version":"6.7.12","lessThanOrEqual":"6.7.*","status":"unaffected","versionType":"semver"},{"version":"6.8.3","lessThanOrEqual":"6.8.*","status":"unaffected","versionType":"semver"},{"version":"6.9","lessThanOrEqual":"*","status":"unaffected","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.31","versionEndExcluding":"4.19.312"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.31","versionEndExcluding":"5.4.274"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.31","versionEndExcluding":"5.10.215"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.31","versionEndExcluding":"5.15.154"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.31","versionEndExcluding":"6.1.84"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.31","versionEndExcluding":"6.6.24"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.31","versionEndExcluding":"6.7.12"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.31","versionEndExcluding":"6.8.3"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.31","versionEndExcluding":"6.9"}]}]}],"references":[{"url":"https://git.kernel.org/stable/c/b67189690eb4b7ecc84ae16fa1e880e0123eaa35"},{"url":"https://git.kernel.org/stable/c/9cbe1ad5f4354f4df1445e5f4883983328cd6d8e"},{"url":"https://git.kernel.org/stable/c/c3b5c5c31e723b568f83d8cafab8629d9d830ffb"},{"url":"https://git.kernel.org/stable/c/2e2619ff5d0def4bb6c2037a32a6eaa28dd95c84"},{"url":"https://git.kernel.org/stable/c/46b832e09d43b394ac0f6d9485d2b1a06593f0b7"},{"url":"https://git.kernel.org/stable/c/f69e81396aea66304d214f175aa371f1b5578862"},{"url":"https://git.kernel.org/stable/c/a8e4d098de1c0f4c5c1f2ed4633a860f0da6d713"},{"url":"https://git.kernel.org/stable/c/82827ca21e7c8a91384c5baa656f78a5adfa4ab4"},{"url":"https://git.kernel.org/stable/c/f2f26b4a84a0ef41791bd2d70861c8eac748f4ba"}],"title":"nilfs2: 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