CVE-2024-26685
Description
In the Linux kernel, the following vulnerability has been resolved: nilfs2: fix potential bug in end_buffer_async_write According to a syzbot report, end_buffer_async_write(), which handles the completion of block device writes, may detect abnormal condition of the buffer async_write flag and cause a BUG_ON failure when using nilfs2. Nilfs2 itself does not use end_buffer_async_write(). But, the async_write flag is now used as a marker by commit 7f42ec394156 ("nilfs2: fix issue with race condition of competition between segments for dirty blocks") as a means of resolving double list insertion of dirty blocks in nilfs_lookup_dirty_data_buffers() and nilfs_lookup_node_buffers() and the resulting crash. This modification is safe as long as it is used for file data and b-tree node blocks where the page caches are independent. However, it was irrelevant and redundant to also introduce async_write for segment summary and super root blocks that share buffers with the backing device. This led to the possibility that the BUG_ON check in end_buffer_async_write would fail as described above, if independent writebacks of the backing device occurred in parallel. The use of async_write for segment summary buffers has already been removed in a previous change. Fix this issue by removing the manipulation of the async_write flag for the remaining super root block buffer.
How to fix
- linux linux_kernel3.3, 3.5, 3.11, 4.19.307, 5.4.269, 5.10.210, 5.15.149, 6.1.79, 6.6.18, 6.7.6 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| linux linux_kernel | 3.2.52 ≤ v < 3.3, 3.4.83 ≤ v < 3.5, 3.10.16 ≤ v < 3.11, 3.11.5 ≤ v < 4.19.307, 4.20 ≤ v < 5.4.269, 5.5 ≤ v < 5.10.210, 5.11 ≤ v < 5.15.149, 5.16 ≤ v < 6.1.79, 6.2 ≤ v < 6.6.18, 6.7 ≤ v < 6.7.6, 6.8 | 3.3, 3.5, 3.11, 4.19.307, 5.4.269, 5.10.210, 5.15.149, 6.1.79, 6.6.18, 6.7.6 |
| debian debian_linux | 10.0 | — |
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