CVE-2023-54140

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.

PUBLISHED Reserved 2025-12-24 | Published 2025-12-24 | Updated 2025-12-24 | Assigner Linux

Product status

References

git.kernel.org/...c/473795610594f261e98920f0945550314df36f07

git.kernel.org/...c/d95e403588738c7ec38f52b9f490b15e7745d393

git.kernel.org/...c/99a73016a5e12a09586a96f998e91f9ea145cd00

git.kernel.org/...c/f1d637b63d8a27ac3386f186a694907f2717fc13

git.kernel.org/...c/b911bef132a06de01a745c6a24172d6db7216333

git.kernel.org/...c/4da07e958bfda2d69d83db105780e8916e3ac02e

git.kernel.org/...c/46c11be2dca295742a5508ea910a77f7733fb7f4

git.kernel.org/...c/b308b3eabc429649b5501d36290cea403fbd746c

git.kernel.org/...c/cdaac8e7e5a059f9b5e816cda257f08d0abffacd

cve.org (CVE-2023-54140)

nvd.nist.gov (CVE-2023-54140)

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