CVE-2026-46160

In the Linux kernel, the following vulnerability has been resolved:<br /> <br /> btrfs: fix missing last_unlink_trans update when removing a directory<br /> <br /> When removing a directory we are not updating its last_unlink_trans field,<br /> which can result in incorrect fsync behaviour in case some one fsyncs the<br /> directory after it was removed because it&amp;#39;s holding a file descriptor on<br /> it.<br /> <br /> Example scenario:<br /> <br /> mkdir /mnt/dir1<br /> mkdir /mnt/dir1/dir2<br /> mkdir /mnt/dir3<br /> <br /> sync -f /mnt<br /> <br /> # Do some change to the directory and fsync it.<br /> chmod 700 /mnt/dir1<br /> xfs_io -c fsync /mnt/dir1<br /> <br /> # Move dir2 out of dir1 so that dir1 becomes empty.<br /> mv /mnt/dir1/dir2 /mnt/dir3/<br /> <br /> open fd on /mnt/dir1<br /> call rmdir(2) on path "/mnt/dir1"<br /> fsync fd<br /> <br /> <br /> <br /> When attempting to mount the filesystem, the log replay will fail with<br /> an -EIO error and dmesg/syslog has the following:<br /> <br /> [445771.626482] BTRFS info (device dm-0): first mount of filesystem 0368bbea-6c5e-44b5-b409-09abe496e650<br /> [445771.626486] BTRFS info (device dm-0): using crc32c checksum algorithm<br /> [445771.627912] BTRFS info (device dm-0): start tree-log replay<br /> [445771.628335] page: refcount:2 mapcount:0 mapping:0000000061443ddc index:0x1d00 pfn:0x7072a5<br /> [445771.629453] memcg:ffff89f400351b00<br /> [445771.629892] aops:btree_aops [btrfs] ino:1<br /> [445771.630737] flags: 0x17fffc00000402a(uptodate|lru|private|writeback|node=0|zone=2|lastcpupid=0x1ffff)<br /> [445771.632359] raw: 017fffc00000402a fffff47284d950c8 fffff472907b7c08 ffff89f458e412b8<br /> [445771.633713] raw: 0000000000001d00 ffff89f6c51d1a90 00000002ffffffff ffff89f400351b00<br /> [445771.635029] page dumped because: eb page dump<br /> [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<br /> [445771.638088] BTRFS info (device dm-0): leaf 30408704 gen 10 total ptrs 17 free space 14878 owner 5<br /> [445771.638091] BTRFS info (device dm-0): refs 4 lock_owner 0 current 3581087<br /> [445771.638094] item 0 key (256 INODE_ITEM 0) itemoff 16123 itemsize 160<br /> [445771.638097] inode generation 3 transid 9 size 16 nbytes 16384<br /> [445771.638098] block group 0 mode 40755 links 1 uid 0 gid 0<br /> [445771.638100] rdev 0 sequence 2 flags 0x0<br /> [445771.638102] atime 1775744884.0<br /> [445771.660056] ctime 1775744885.645502983<br /> [445771.660058] mtime 1775744885.645502983<br /> [445771.660060] otime 1775744884.0<br /> [445771.660062] item 1 key (256 INODE_REF 256) itemoff 16111 itemsize 12<br /> [445771.660064] index 0 name_len 2<br /> [445771.660066] item 2 key (256 DIR_ITEM 1843588421) itemoff 16077 itemsize 34<br /> [445771.660068] location key (259 1 0) type 2<br /> [445771.660070] transid 9 data_len 0 name_len 4<br /> [445771.660075] item 3 key (256 DIR_ITEM 2363071922) itemoff 16043 itemsize 34<br /> [445771.660076] location key (257 1 0) type 2<br /> [445771.660077] transid 9 data_len 0 name_len 4<br /> [445771.660078] item 4 key (256 DIR_INDEX 2) itemoff 16009 itemsize 34<br /> [445771.660079] location key (257 1 0) type 2<br /> [445771.660080] transid 9 data_len 0 name_len 4<br /> [445771.660081] item 5 key (256 DIR_INDEX 3) itemoff 15975 itemsize 34<br /> [445771.660082] location key (259 1 0) type 2<br /> [445771.660083] transid 9 data_len 0 name_len 4<br /> [445771.660084] item 6 key (257 INODE_ITEM 0) itemoff 15815 itemsize 160<br /> [445771.660086] inode generation 9 transid 9 size 8 nbytes 0<br /> [445771.660087] block group 0 mode 40777 links 1 uid 0 gid 0<br /> [445771.660088] rdev 0 sequence 2 flags 0x0<br /> [445771.660089] atime 1775744885.641174097<br /> [445771.660090] ctime 1775744885.645502983<br /> [445771.660091] mtime 1775744885.645502983<br /> [445771.660105] otime 1775744885.641174097<br /> [445771.660106] item 7 key (257 INODE_REF 256) itemoff 15801 itemsize 14<br /> [445771.660107] index 2 name_len 4<br /> [445771.660108] item 8 key (257 DIR_ITEM 2676584006) itemoff 15767 itemsize 34<br /> [445771.660109] location key (2<br /> ---truncated---