{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-31577","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","state":"PUBLISHED","assignerShortName":"Linux","dateReserved":"2026-03-09T15:48:24.119Z","datePublished":"2026-04-24T14:42:08.879Z","dateUpdated":"2026-05-11T22:11:28.945Z"},"containers":{"cna":{"providerMetadata":{"orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux","dateUpdated":"2026-05-11T22:11:28.945Z"},"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nnilfs2: fix NULL i_assoc_inode dereference in nilfs_mdt_save_to_shadow_map\n\nThe DAT inode's btree node cache (i_assoc_inode) is initialized lazily\nduring btree operations. However, nilfs_mdt_save_to_shadow_map()\nassumes i_assoc_inode is already initialized when copying dirty pages\nto the shadow map during GC.\n\nIf NILFS_IOCTL_CLEAN_SEGMENTS is called immediately after mount before\nany btree operation has occurred on the DAT inode, i_assoc_inode is\nNULL leading to a general protection fault.\n\nFix this by calling nilfs_attach_btree_node_cache() on the DAT inode\nin nilfs_dat_read() at mount time, ensuring i_assoc_inode is always\ninitialized before any GC operation can use it."}],"affected":[{"product":"Linux","vendor":"Linux","defaultStatus":"unaffected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["fs/nilfs2/dat.c"],"versions":[{"version":"e897be17a441fa637cd166fc3de1445131e57692","lessThan":"7318e3549518ce8f14776a489d86488d80d7e2c8","status":"affected","versionType":"git"},{"version":"e897be17a441fa637cd166fc3de1445131e57692","lessThan":"449ec5fc99f45974525ba9eea16b6670c45cd363","status":"affected","versionType":"git"},{"version":"e897be17a441fa637cd166fc3de1445131e57692","lessThan":"c36e206f302f1ddefed92d09ecbba070e1ae079e","status":"affected","versionType":"git"},{"version":"e897be17a441fa637cd166fc3de1445131e57692","lessThan":"41de342278ae025c99cc8d33648773f05e306cf1","status":"affected","versionType":"git"},{"version":"e897be17a441fa637cd166fc3de1445131e57692","lessThan":"97fb7afec404912d967a7d4715f37742666b3084","status":"affected","versionType":"git"},{"version":"e897be17a441fa637cd166fc3de1445131e57692","lessThan":"4a4e0328edd9e9755843787d28f16dd4165f8b48","status":"affected","versionType":"git"},{"version":"6c3da8c0a35bbafe359d9166269d5590f29664de","status":"affected","versionType":"git"},{"version":"605babb979c213737618b1c837e89624e5ab11fd","status":"affected","versionType":"git"},{"version":"307d021b1a7f33048b624f7aaeaa75e3eae571f1","status":"affected","versionType":"git"},{"version":"d626fcdabea2258be395a775bdbe09270e9bf73d","status":"affected","versionType":"git"},{"version":"d05cc5395e36711edad8bdef6945f138d8a7097b","status":"affected","versionType":"git"},{"version":"1829b24a36ca12ca95b96d5478faeff40c17f2b6","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/dat.c"],"versions":[{"version":"5.18","status":"affected"},{"version":"0","lessThan":"5.18","status":"unaffected","versionType":"semver"},{"version":"6.6.136","lessThanOrEqual":"6.6.*","status":"unaffected","versionType":"semver"},{"version":"6.12.83","lessThanOrEqual":"6.12.*","status":"unaffected","versionType":"semver"},{"version":"6.18.24","lessThanOrEqual":"6.18.*","status":"unaffected","versionType":"semver"},{"version":"6.19.14","lessThanOrEqual":"6.19.*","status":"unaffected","versionType":"semver"},{"version":"7.0.1","lessThanOrEqual":"7.0.*","status":"unaffected","versionType":"semver"},{"version":"7.1-rc1","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":"5.18","versionEndExcluding":"6.6.136"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.18","versionEndExcluding":"6.12.83"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.18","versionEndExcluding":"6.18.24"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.18","versionEndExcluding":"6.19.14"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.18","versionEndExcluding":"7.0.1"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.18","versionEndExcluding":"7.1-rc1"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.14.296"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.19.245"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.4.196"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.10.118"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.15.42"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.17.10"}]}]}],"references":[{"url":"https://git.kernel.org/stable/c/7318e3549518ce8f14776a489d86488d80d7e2c8"},{"url":"https://git.kernel.org/stable/c/449ec5fc99f45974525ba9eea16b6670c45cd363"},{"url":"https://git.kernel.org/stable/c/c36e206f302f1ddefed92d09ecbba070e1ae079e"},{"url":"https://git.kernel.org/stable/c/41de342278ae025c99cc8d33648773f05e306cf1"},{"url":"https://git.kernel.org/stable/c/97fb7afec404912d967a7d4715f37742666b3084"},{"url":"https://git.kernel.org/stable/c/4a4e0328edd9e9755843787d28f16dd4165f8b48"}],"title":"nilfs2: fix NULL i_assoc_inode dereference in nilfs_mdt_save_to_shadow_map","x_generator":{"engine":"bippy-1.2.0"}}}}