Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: nilfs2: fix WARNING in mark_buffer_dirty due to discarded buffer reuse A syzbot stress test using a corrupted disk image reported that mark_buffer_dirty() called from __nilfs_mark_inode_dirty() or nilfs_palloc_commit_alloc_entry() may output a kernel warning, and can panic if the kernel is booted with panic_on_warn. This is because nilfs2 keeps buffer pointers in local structures for some metadata and reuses them, but such buffers may be forcibly discarded by nilfs_clear_dirty_page() in some critical situations. This issue is reported to appear after commit 28a65b49eb53 ("nilfs2: do not write dirty data after degenerating to read-only"), but the issue has potentially existed before. Fix this issue by checking the uptodate flag when attempting to reuse an internally held buffer, and reloading the metadata instead of reusing the buffer if the flag was lost.
References
- https://git.kernel.org/stable/c/46c11be2dca295742a5508ea910a77f7733fb7f4
- https://git.kernel.org/stable/c/473795610594f261e98920f0945550314df36f07
- https://git.kernel.org/stable/c/4da07e958bfda2d69d83db105780e8916e3ac02e
- https://git.kernel.org/stable/c/99a73016a5e12a09586a96f998e91f9ea145cd00
- https://git.kernel.org/stable/c/b308b3eabc429649b5501d36290cea403fbd746c
- https://git.kernel.org/stable/c/b911bef132a06de01a745c6a24172d6db7216333
- https://git.kernel.org/stable/c/cdaac8e7e5a059f9b5e816cda257f08d0abffacd
- https://git.kernel.org/stable/c/d95e403588738c7ec38f52b9f490b15e7745d393
- https://git.kernel.org/stable/c/f1d637b63d8a27ac3386f186a694907f2717fc13
FAQ
What is CVE-2023-54140?
CVE-2023-54140 is a documented vulnerability. In the Linux kernel, the following vulnerability has been resolved: nilfs2: fix WARNING in mark_buffer_dirty due to discarded buffer reuse A syzbot stress test using a corrupted disk image reported ...
How severe is CVE-2023-54140?
CVSS scoring is not yet available for CVE-2023-54140. Check NVD for updates.
Is there a patch for CVE-2023-54140?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.