{"id":"CVE-2026-46160","title":"btrfs: fix missing last_unlink_trans update when removing a directory","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\nbtrfs: fix missing last_unlink_trans update when removing a directory\n\nWhen removing a directory we are not updating its last_unlink_trans field,\nwhich can result in in…","severity":"none","vendor":"Linux","product":"Linux","affected":["Linux >= 12fcfd22fe5bf4fe74710232098bc101af497995 < af467162290f5fe79d6a361b7c84302e45b1fd9f","Linux >= 12fcfd22fe5bf4fe74710232098bc101af497995 < 2525998ac956476bded26b9f34c4164dc890b87a","Linux >= 12fcfd22fe5bf4fe74710232098bc101af497995 < 6acbb2f6dff23c9bb9761fb98b516525b9cf1ce9","Linux >= 12fcfd22fe5bf4fe74710232098bc101af497995 < cc3c0a0f965754ce230d93ba44ee5b34fbe6138a","Linux >= 12fcfd22fe5bf4fe74710232098bc101af497995 < aa9c3ecaf7337df3a689318584f879b5339ede0f","Linux >= 12fcfd22fe5bf4fe74710232098bc101af497995 < fb388eb58c1ba047ccabc33901839acfecadcf49","Linux >= 12fcfd22fe5bf4fe74710232098bc101af497995 < 36fcc2c7517f8a86379154c9793f867592aa8b7e","Linux >= 12fcfd22fe5bf4fe74710232098bc101af497995 < 999757231c49376cd1a37308d2c8c4c9932571e1","Linux 2.6.30"],"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"partial","timestamp":"2026-11-06T16:10:31.114616Z"},"published":"2026-05-28","updated":"2026-11-06","sourceUpdated":"2026-11-06T16:13:42.016Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-46160","references":[{"url":"https://git.kernel.org/stable/c/af467162290f5fe79d6a361b7c84302e45b1fd9f"},{"url":"https://git.kernel.org/stable/c/2525998ac956476bded26b9f34c4164dc890b87a"},{"url":"https://git.kernel.org/stable/c/6acbb2f6dff23c9bb9761fb98b516525b9cf1ce9"},{"url":"https://git.kernel.org/stable/c/cc3c0a0f965754ce230d93ba44ee5b34fbe6138a"},{"url":"https://git.kernel.org/stable/c/aa9c3ecaf7337df3a689318584f879b5339ede0f"},{"url":"https://git.kernel.org/stable/c/fb388eb58c1ba047ccabc33901839acfecadcf49"},{"url":"https://git.kernel.org/stable/c/36fcc2c7517f8a86379154c9793f867592aa8b7e"},{"url":"https://git.kernel.org/stable/c/999757231c49376cd1a37308d2c8c4c9932571e1"}],"tags":["cve.org"],"epss":0.00128,"epssPercentile":0.0247,"ingestedAt":"2026-11-06T16:57:43.329Z","slug":"CVE-2026-46160","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\nbtrfs: fix missing last_unlink_trans update when removing a directory\n\nWhen removing a directory we are not updating its last_unlink_trans field,\nwhich can result in incorrect fsync behaviour in case some one fsyncs the\ndirectory after it was removed because it's holding a file descriptor on\nit.\n\nExample scenario:\n\n   mkdir /mnt/dir1\n   mkdir /mnt/dir1/dir2\n   mkdir /mnt/dir3\n\n   sync -f /mnt\n\n   # Do some change to the directory and fsync it.\n   chmod 700 /mnt/dir1\n   xfs_io -c fsync /mnt/dir1\n\n   # Move dir2 out of dir1 so that dir1 becomes empty.\n   mv /mnt/dir1/dir2 /mnt/dir3/\n\n   open fd on /mnt/dir1\n   call rmdir(2) on path \"/mnt/dir1\"\n   fsync fd\n\n   <trigger power failure>\n\nWhen attempting to mount the filesystem, the log replay will fail with\nan -EIO error and dmesg/syslog has the following:\n\n   [445771.626482] BTRFS info (device dm-0): first mount of filesystem 0368bbea-6c5e-44b5-b409-09abe496e650\n   [445771.626486] BTRFS info (device dm-0): using crc32c checksum algorithm\n   [445771.627912] BTRFS info (device dm-0): start tree-log replay\n   [445771.628335] page: refcount:2 mapcount:0 mapping:0000000061443ddc index:0x1d00 pfn:0x7072a5\n   [445771.629453] memcg:ffff89f400351b00\n   [445771.629892] aops:btree_aops [btrfs] ino:1\n   [445771.630737] flags: 0x17fffc00000402a(uptodate|lru|private|writeback|node=0|zone=2|lastcpupid=0x1ffff)\n   [445771.632359] raw: 017fffc00000402a fffff47284d950c8 fffff472907b7c08 ffff89f458e412b8\n   [445771.633713] raw: 0000000000001d00 ffff89f6c51d1a90 00000002ffffffff ffff89f400351b00\n   [445771.635029] page dumped because: eb page dump\n   [445771.635825] BTRFS critical (device dm-0): corrupt leaf: root=5 block=30408704 slot=10 ino=258, invalid nlink: has 2 expect no more than 1 for dir\n   [445771.638088] BTRFS info (device dm-0): leaf 30408704 gen 10 total ptrs 17 free space 14878 owner 5\n   [445771.638091] BTRFS info (device dm-0): refs 4 lock_owner 0 current 3581087\n   [445771.638094] \titem 0 key (256 INODE_ITEM 0) itemoff 16123 itemsize 160\n   [445771.638097] \t\tinode generation 3 transid 9 size 16 nbytes 16384\n   [445771.638098] \t\tblock group 0 mode 40755 links 1 uid 0 gid 0\n   [445771.638100] \t\trdev 0 sequence 2 flags 0x0\n   [445771.638102] \t\tatime 1775744884.0\n   [445771.660056] \t\tctime 1775744885.645502983\n   [445771.660058] \t\tmtime 1775744885.645502983\n   [445771.660060] \t\totime 1775744884.0\n   [445771.660062] \titem 1 key (256 INODE_REF 256) itemoff 16111 itemsize 12\n   [445771.660064] \t\tindex 0 name_len 2\n   [445771.660066] \titem 2 key (256 DIR_ITEM 1843588421) itemoff 16077 itemsize 34\n   [445771.660068] \t\tlocation key (259 1 0) type 2\n   [445771.660070] \t\ttransid 9 data_len 0 name_len 4\n   [445771.660075] \titem 3 key (256 DIR_ITEM 2363071922) itemoff 16043 itemsize 34\n   [445771.660076] \t\tlocation key (257 1 0) type 2\n   [445771.660077] \t\ttransid 9 data_len 0 name_len 4\n   [445771.660078] \titem 4 key (256 DIR_INDEX 2) itemoff 16009 itemsize 34\n   [445771.660079] \t\tlocation key (257 1 0) type 2\n   [445771.660080] \t\ttransid 9 data_len 0 name_len 4\n   [445771.660081] \titem 5 key (256 DIR_INDEX 3) itemoff 15975 itemsize 34\n   [445771.660082] \t\tlocation key (259 1 0) type 2\n   [445771.660083] \t\ttransid 9 data_len 0 name_len 4\n   [445771.660084] \titem 6 key (257 INODE_ITEM 0) itemoff 15815 itemsize 160\n   [445771.660086] \t\tinode generation 9 transid 9 size 8 nbytes 0\n   [445771.660087] \t\tblock group 0 mode 40777 links 1 uid 0 gid 0\n   [445771.660088] \t\trdev 0 sequence 2 flags 0x0\n   [445771.660089] \t\tatime 1775744885.641174097\n   [445771.660090] \t\tctime 1775744885.645502983\n   [445771.660091] \t\tmtime 1775744885.645502983\n   [445771.660105] \t\totime 1775744885.641174097\n   [445771.660106] \titem 7 key (257 INODE_REF 256) itemoff 15801 itemsize 14\n   [445771.660107] \t\tindex 2 name_len 4\n   [445771.660108] \titem 8 key (257 DIR_ITEM 2676584006) itemoff 15767 itemsize 34\n   [445771.660109] \t\tlocation key (2\n---truncated---\n\n## Affected\n\n- `Linux >= 12fcfd22fe5bf4fe74710232098bc101af497995 < af467162290f5fe79d6a361b7c84302e45b1fd9f`\n- `Linux >= 12fcfd22fe5bf4fe74710232098bc101af497995 < 2525998ac956476bded26b9f34c4164dc890b87a`\n- `Linux >= 12fcfd22fe5bf4fe74710232098bc101af497995 < 6acbb2f6dff23c9bb9761fb98b516525b9cf1ce9`\n- `Linux >= 12fcfd22fe5bf4fe74710232098bc101af497995 < cc3c0a0f965754ce230d93ba44ee5b34fbe6138a`\n- `Linux >= 12fcfd22fe5bf4fe74710232098bc101af497995 < aa9c3ecaf7337df3a689318584f879b5339ede0f`\n- `Linux >= 12fcfd22fe5bf4fe74710232098bc101af497995 < fb388eb58c1ba047ccabc33901839acfecadcf49`\n- `Linux >= 12fcfd22fe5bf4fe74710232098bc101af497995 < 36fcc2c7517f8a86379154c9793f867592aa8b7e`\n- `Linux >= 12fcfd22fe5bf4fe74710232098bc101af497995 < 999757231c49376cd1a37308d2c8c4c9932571e1`\n- `Linux 2.6.30`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"sunlit","depthScore":3,"depthScoreParts":{"impact":2.8,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}