CVE-2022-50673
Description
In the Linux kernel, the following vulnerability has been resolved: ext4: fix use-after-free in ext4_orphan_cleanup I caught a issue as follows: ================================================================== BUG: KASAN: use-after-free in __list_add_valid+0x28/0x1a0 Read of size 8 at addr ffff88814b13f378 by task mount/710 CPU: 1 PID: 710 Comm: mount Not tainted 6.1.0-rc3-next #370 Call Trace: <TASK> dump_stack_lvl+0x73/0x9f print_report+0x25d/0x759 kasan_report+0xc0/0x120 __asan_load8+0x99/0x140 __list_add_valid+0x28/0x1a0 ext4_orphan_cleanup+0x564/0x9d0 [ext4] __ext4_fill_super+0x48e2/0x5300 [ext4] ext4_fill_super+0x19f/0x3a0 [ext4] get_tree_bdev+0x27b/0x450 ext4_get_tree+0x19/0x30 [ext4] vfs_get_tree+0x49/0x150 path_mount+0xaae/0x1350 do_mount+0xe2/0x110 __x64_sys_mount+0xf0/0x190 do_syscall_64+0x35/0x80 entry_SYSCALL_64_after_hwframe+0x63/0xcd </TASK> [...] ================================================================== Above issue may happen as follows: ------------------------------------- ext4_fill_super ext4_orphan_cleanup --- loop1: assume last_orphan is 12 --- list_add(&EXT4_I(inode)->i_orphan, &EXT4_SB(sb)->s_orphan) ext4_truncate --> return 0 ext4_inode_attach_jinode --> return -ENOMEM iput(inode) --> free inode<12> --- loop2: last_orphan is still 12 --- list_add(&EXT4_I(inode)->i_orphan, &EXT4_SB(sb)->s_orphan); // use inode<12> and trigger UAF To solve this issue, we need to propagate the return value of ext4_inode_attach_jinode() appropriately.
How to fix
- Linux Linux7f801a1593cb957f73659732836b2dafbdfc7709, 026a4490b5381229a30f23d073b58e8e35ee6858, 7223d5e75f26352354ea2c0ccf8b579821b52adf, cf0e0817b0f925b70d101d7014ea81b7094e1159, c2bdbd4c69308835d1b6f6ba74feeccbfe113478, 7908b8a541b1578cc61b4da7f19b604a931441da, a71248b1accb2b42e4980afef4fa4a27fa0e36f5 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| Linux Linux | 2c98eb5ea249767bbc11cf4e70e91d5b0458ed13 ≤ v < 7f801a1593cb957f73659732836b2dafbdfc7709, 2c98eb5ea249767bbc11cf4e70e91d5b0458ed13 ≤ v < 026a4490b5381229a30f23d073b58e8e35ee6858, 2c98eb5ea249767bbc11cf4e70e91d5b0458ed13 ≤ v < 7223d5e75f26352354ea2c0ccf8b579821b52adf, 2c98eb5ea249767bbc11cf4e70e91d5b0458ed13 ≤ v < cf0e0817b0f925b70d101d7014ea81b7094e1159, 2c98eb5ea249767bbc11cf4e70e91d5b0458ed13 ≤ v < c2bdbd4c69308835d1b6f6ba74feeccbfe113478, 2c98eb5ea249767bbc11cf4e70e91d5b0458ed13 ≤ v < 7908b8a541b1578cc61b4da7f19b604a931441da, 2c98eb5ea249767bbc11cf4e70e91d5b0458ed13 ≤ v < a71248b1accb2b42e4980afef4fa4a27fa0e36f5, 4.10 | 7f801a1593cb957f73659732836b2dafbdfc7709, 026a4490b5381229a30f23d073b58e8e35ee6858, 7223d5e75f26352354ea2c0ccf8b579821b52adf, cf0e0817b0f925b70d101d7014ea81b7094e1159, c2bdbd4c69308835d1b6f6ba74feeccbfe113478, 7908b8a541b1578cc61b4da7f19b604a931441da, a71248b1accb2b42e4980afef4fa4a27fa0e36f5 |
Check your version
Choose the product and enter the version you run to see whether it falls in the affected range.
Attack Surface Management
See the assets tied to your domains, the technologies they run and known vulnerabilities in one list.