CVE-2023-53149
- Source
- https://nvd.nist.gov/vuln/detail/CVE-2023-53149
- Import Source
- https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2023-53149.json
- JSON Data
- https://api.osv.dev/v1/vulns/CVE-2023-53149
- Downstream
- Published
- 2025-09-15T14:15:37Z
- Modified
- 2025-09-15T19:00:18Z
- Summary
- [none]
- Details
-
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
ext4writepages() percpudownread(sbi->swritepagesrwsem); ext4changeinodejournalflag() percpudownwrite(sbi->swritepagesrwsem); - blocks, all readers block from now on ext4dowritepages() ext4initioend() kmemcachezalloc(ioendcachep, GFPKERNEL) fsreclaim frees dentry... dentryunlinkinode() iput() - last ref => iputfinal() - inode dirty => writeinodenow()... ext4writepages() tries to acquire sbi->swritepagesrwsem and blocks forever
Make sure we cannot recurse into filesystem reclaim from writeback code to avoid the deadlock.
- References