In the Linux kernel, the following vulnerability has been resolved:
ext4: avoid deadlock in fs reclaim with page writeback
Ext4 has a filesystem wide lock protecting ext4_writepages() calls to
avoid races with switching of journalled data flag or inode format. This
lock can however cause a deadlock like:
CPU0 CPU1
ext4_writepages()
percpu_down_read(sbi->s_writepages_rwsem);
ext4_change_inode_journal_flag()
percpu_down_write(sbi->s_writepages_rwsem);
- blocks, all readers block from now on
ext4_do_writepages()
ext4_init_io_end()
kmem_cache_zalloc(io_end_cachep, GFP_KERNEL)
fs_reclaim frees dentry...
dentry_unlink_inode()
iput() - last ref =>
iput_final() - inode dirty =>
write_inode_now()...
ext4_writepages() tries to acquire sbi->s_writepages_rwsem
and blocks forever
Make sure we cannot recurse into filesystem reclaim from writeback code
to avoid the deadlock.
References
Configurations
Configuration 1 (hide)
|
History
25 Nov 2025, 17:03
| Type | Values Removed | Values Added |
|---|---|---|
| References | () https://git.kernel.org/stable/c/00d873c17e29cc32d90ca852b82685f1673acaa5 - Patch | |
| References | () https://git.kernel.org/stable/c/2ec97dc90df40c50e509809dc9a198638a7e18b6 - Patch | |
| References | () https://git.kernel.org/stable/c/4b4340bf04ce9a52061f15000ecedd126abc093c - Patch | |
| CVSS |
v2 : v3 : |
v2 : unknown
v3 : 5.5 |
| CWE | CWE-667 | |
| CPE | cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* cpe:2.3:o:linux:linux_kernel:6.4:rc1:*:*:*:*:*:* |
|
| First Time |
Linux linux Kernel
Linux |
Information
Published : 2025-09-15 14:15
Updated : 2025-11-25 17:03
NVD link : CVE-2023-53149
Mitre link : CVE-2023-53149
CVE.ORG link : CVE-2023-53149
JSON object : View
Products Affected
linux
- linux_kernel
CWE
CWE-667
Improper Locking