{"id":"CVE-2026-97949","state":"PUBLISHED","title":"configfs: unhash the dentry before dropping the item in rmdir","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nconfigfs: unhash the dentry before dropping the item in rmdir\n\nconfigfs_get_config_item() treats a hashed dentry as proof that\nsd->s_element is a live config_item.  configfs_rmdir() breaks that:\nsimple_rmdir() leaves the dentry hashed, the last reference to the item is\ndropped right after, and the dentry is only unhashed by d_delete() once\n->rmdir() has returned.  configfs_symlink() resolves its target holding no\nlock on it, so get_target() can land in that window:\n\n  BUG: KASAN: slab-use-after-free in config_item_get+0x26/0x90\n   get_target fs/configfs/symlink.c:128 [inline]\n   configfs_symlink+0x4ab/0x1030 fs/configfs/symlink.c:185\n\nUnhash in configfs_remove_dir(), while the item is still guaranteed to be\nthere.  A reference obtained just before that stays harmless, as\ncreate_link() rechecks CONFIGFS_USET_DROPPING, already set by\nconfigfs_detach_prep().  Both configfs_unregister_subsystem() paths\nd_drop() after detaching, so this only makes rmdir match them.","publishedAt":"2026-09-25T10:22:58.375Z","updatedAt":"2026-10-21T12:53:47.600Z","severity":null,"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"7063fbf2261194f72ee75afca67b3b38b554b5fa","status":"affected","lessThan":"b315d865660766d45ecdbf7433a4e3d36a554b3b","versionType":"git"},{"version":"7063fbf2261194f72ee75afca67b3b38b554b5fa","status":"affected","lessThan":"446720051d44eebaa81b33969173160057b73a33","versionType":"git"},{"version":"7063fbf2261194f72ee75afca67b3b38b554b5fa","status":"affected","lessThan":"5d7cbfb65e47cc71d5d94d87d5d0d1679080f3eb","versionType":"git"},{"version":"7063fbf2261194f72ee75afca67b3b38b554b5fa","status":"affected","lessThan":"925d8564f1b2d9b46c5ab63b9bc942cea006da9b","versionType":"git"},{"version":"7063fbf2261194f72ee75afca67b3b38b554b5fa","status":"affected","lessThan":"f06c2d26d1999d37e93299db0ecead04ca7d0b9f","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["fs/configfs/dir.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"2.6.16","status":"affected"},{"version":"0","status":"unaffected","lessThan":"2.6.16","versionType":"semver"},{"version":"6.6.160","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.112","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.53","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.2.7","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/configfs/dir.c"]}],"references":["https://git.kernel.org/stable/c/b315d865660766d45ecdbf7433a4e3d36a554b3b","https://git.kernel.org/stable/c/446720051d44eebaa81b33969173160057b73a33","https://git.kernel.org/stable/c/5d7cbfb65e47cc71d5d94d87d5d0d1679080f3eb","https://git.kernel.org/stable/c/925d8564f1b2d9b46c5ab63b9bc942cea006da9b","https://git.kernel.org/stable/c/f06c2d26d1999d37e93299db0ecead04ca7d0b9f"],"weaknesses":[],"ingestedAt":"2026-10-29T20:13:43.249Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/97xxx/CVE-2026-97949.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-97949","state":"PUBLISHED","datePublished":"2026-09-25T10:22:58.375Z","dateUpdated":"2026-10-21T12:53:47.600Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-09-25T10:18:58.205Z"},"containers":{"cna":{"title":"configfs: unhash the dentry before dropping the item in rmdir","descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nconfigfs: unhash the dentry before dropping the item in rmdir\n\nconfigfs_get_config_item() treats a hashed dentry as proof that\nsd->s_element is a live config_item.  configfs_rmdir() breaks that:\nsimple_rmdir() leaves the dentry hashed, the last reference to the item is\ndropped right after, and the dentry is only unhashed by d_delete() once\n->rmdir() has returned.  configfs_symlink() resolves its target holding no\nlock on it, so get_target() can land in that window:\n\n  BUG: KASAN: slab-use-after-free in config_item_get+0x26/0x90\n   get_target fs/configfs/symlink.c:128 [inline]\n   configfs_symlink+0x4ab/0x1030 fs/configfs/symlink.c:185\n\nUnhash in configfs_remove_dir(), while the item is still guaranteed to be\nthere.  A reference obtained just before that stays harmless, as\ncreate_link() rechecks CONFIGFS_USET_DROPPING, already set by\nconfigfs_detach_prep().  Both configfs_unregister_subsystem() paths\nd_drop() after detaching, so this only makes rmdir match them."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"7063fbf2261194f72ee75afca67b3b38b554b5fa","status":"affected","lessThan":"b315d865660766d45ecdbf7433a4e3d36a554b3b","versionType":"git"},{"version":"7063fbf2261194f72ee75afca67b3b38b554b5fa","status":"affected","lessThan":"446720051d44eebaa81b33969173160057b73a33","versionType":"git"},{"version":"7063fbf2261194f72ee75afca67b3b38b554b5fa","status":"affected","lessThan":"5d7cbfb65e47cc71d5d94d87d5d0d1679080f3eb","versionType":"git"},{"version":"7063fbf2261194f72ee75afca67b3b38b554b5fa","status":"affected","lessThan":"925d8564f1b2d9b46c5ab63b9bc942cea006da9b","versionType":"git"},{"version":"7063fbf2261194f72ee75afca67b3b38b554b5fa","status":"affected","lessThan":"f06c2d26d1999d37e93299db0ecead04ca7d0b9f","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["fs/configfs/dir.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"2.6.16","status":"affected"},{"version":"0","status":"unaffected","lessThan":"2.6.16","versionType":"semver"},{"version":"6.6.160","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.112","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.53","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.2.7","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/configfs/dir.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/b315d865660766d45ecdbf7433a4e3d36a554b3b"},{"url":"https://git.kernel.org/stable/c/446720051d44eebaa81b33969173160057b73a33"},{"url":"https://git.kernel.org/stable/c/5d7cbfb65e47cc71d5d94d87d5d0d1679080f3eb"},{"url":"https://git.kernel.org/stable/c/925d8564f1b2d9b46c5ab63b9bc942cea006da9b"},{"url":"https://git.kernel.org/stable/c/f06c2d26d1999d37e93299db0ecead04ca7d0b9f"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-10-21T12:53:47.600Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.16","versionEndExcluding":"6.6.160"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.16","versionEndExcluding":"6.12.112"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.16","versionEndExcluding":"6.18.53"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.16","versionEndExcluding":"7.2.7"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.16","versionEndExcluding":"7.3"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}}}}}