vulnerability
Ubuntu: (CVE-2022-49879): linux vulnerability
| Severity | CVSS | Published | Added | Modified |
|---|---|---|---|---|
| 5 | (AV:L/AC:L/Au:S/C:N/I:N/A:C) | May 1, 2025 | May 6, 2025 | Jun 12, 2025 |
Description
In the Linux kernel, the following vulnerability has been resolved:
ext4: fix BUG_ON() when directory entry has invalid rec_len
The rec_len field in the directory entry has to be a multiple of 4. A
corrupted filesystem image can be used to hit a BUG() in
ext4_rec_len_to_disk(), called from make_indexed_dir().
------------[ cut here ]------------
kernel BUG at fs/ext4/ext4.h:2413!
...
RIP: 0010:make_indexed_dir+0x53f/0x5f0
...
Call Trace:
? add_dirent_to_buf+0x1b2/0x200
ext4_add_entry+0x36e/0x480
ext4_add_nondir+0x2b/0xc0
ext4_create+0x163/0x200
path_openat+0x635/0xe90
do_filp_open+0xb4/0x160
? __create_object.isra.0+0x1de/0x3b0
? _raw_spin_unlock+0x12/0x30
do_sys_openat2+0x91/0x150
__x64_sys_open+0x6c/0xa0
do_syscall_64+0x3c/0x80
entry_SYSCALL_64_after_hwframe+0x46/0xb0
The fix simply adds a call to ext4_check_dir_entry() to validate the
directory entry, returning -EFSCORRUPTED if the entry is invalid.
Solution(s)
References
- CVE-2022-49879
- https://attackerkb.com/topics/CVE-2022-49879
- URL-https://git.kernel.org/linus/17a0bc9bd697f75cfdf9b378d5eb2d7409c91340
- URL-https://git.kernel.org/stable/c/156451a67b93986fb07c274ef6995ff40766c5ad
- URL-https://git.kernel.org/stable/c/17a0bc9bd697f75cfdf9b378d5eb2d7409c91340
- URL-https://git.kernel.org/stable/c/2fa24d0274fbf913b56ee31f15bc01168669d909
- URL-https://git.kernel.org/stable/c/999cff2b6ce3b45c08abf793bf55534777421327
- URL-https://git.kernel.org/stable/c/ce1ee2c8827fb6493e91acbd50f664cf2a972c3d
- URL-https://www.cve.org/CVERecord?id=CVE-2022-49879
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