CVE-2022-50673ext4: fix use-after-free in ext4_orphan_cleanup
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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.
- CVSS
- 7.8 HIGH (v3.1, CNA)CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
- Weakness (CWE)
- Not given
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Linux
- NVD analysis
- Deferred
- Record last updated
- Aug 5, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Linux Linux linux:linux (from the name) | from 2c98eb5ea249767bbc11cf4e70e91d5b0458ed13 before 7f801a1593cb957f73659732836b2dafbdfc7709; from 2c98eb5ea249767bbc11cf4e70e91d5b0458ed13 before 026a4490b5381229a30f23d073b58e8e35ee6858; from 2c98eb5ea249767bbc11cf4e70e91d5b0458ed13 before 7223d5e75f26352354ea2c0ccf8b579821b52adf; from 2c98eb5ea249767bbc11cf4e70e91d5b0458ed13 before cf0e0817b0f925b70d101d7014ea81b7094e1159; from 2c98eb5ea249767bbc11cf4e70e91d5b0458ed13 before c2bdbd4c69308835d1b6f6ba74feeccbfe113478; from 2c98eb5ea249767bbc11cf4e70e91d5b0458ed13 before 7908b8a541b1578cc61b4da7f19b604a931441da; from 2c98eb5ea249767bbc11cf4e70e91d5b0458ed13 before a71248b1accb2b42e4980afef4fa4a27fa0e36f5 | CNA record |
References
- https://git.kernel.org/stable/c/7f801a1593cb957f73659732836b2dafbdfc7709
- https://git.kernel.org/stable/c/026a4490b5381229a30f23d073b58e8e35ee6858
- https://git.kernel.org/stable/c/7223d5e75f26352354ea2c0ccf8b579821b52adf
- https://git.kernel.org/stable/c/cf0e0817b0f925b70d101d7014ea81b7094e1159
- https://git.kernel.org/stable/c/c2bdbd4c69308835d1b6f6ba74feeccbfe113478
- https://git.kernel.org/stable/c/7908b8a541b1578cc61b4da7f19b604a931441da
- https://git.kernel.org/stable/c/a71248b1accb2b42e4980afef4fa4a27fa0e36f5
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.