CVE-2024-26685

MEDIUM
Published Apr 3, 2024 Modified Apr 8, 2025 CWE-787

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.

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CVSS v3.1 Score

5.5
MEDIUM
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Weakness Type (CWE)

CWE-787 Out-of-bounds Write

Affected Products

Vendor Product
linux linux_kernel
linux linux_kernel
linux linux_kernel
linux linux_kernel
linux linux_kernel
linux linux_kernel
linux linux_kernel
linux linux_kernel
linux linux_kernel
linux linux_kernel
linux linux_kernel
linux linux_kernel
linux linux_kernel
debian debian_linux

References

Advisories & Patches

https://git.kernel.org/stable/c/2c3bdba00283a6c7a5b19481a59a730f46063803 https://git.kernel.org/stable/c/5bc09b397cbf1221f8a8aacb1152650c9195b02b https://git.kernel.org/stable/c/626daab3811b772086aef1bf8eed3ffe6f523eff https://git.kernel.org/stable/c/6589f0f72f8edd1fa11adce4eedbd3615f2e78ab https://git.kernel.org/stable/c/8fa90634ec3e9cc50f42dd605eec60f2d146ced8 https://git.kernel.org/stable/c/c4a09fdac625e64abe478dcf88bfa20406616928 https://git.kernel.org/stable/c/d31c8721e816eff5ca6573cc487754f357c093cd https://git.kernel.org/stable/c/f3e4963566f58726d3265a727116a42b591f6596 https://git.kernel.org/stable/c/2c3bdba00283a6c7a5b19481a59a730f46063803 https://git.kernel.org/stable/c/5bc09b397cbf1221f8a8aacb1152650c9195b02b https://git.kernel.org/stable/c/626daab3811b772086aef1bf8eed3ffe6f523eff https://git.kernel.org/stable/c/6589f0f72f8edd1fa11adce4eedbd3615f2e78ab https://git.kernel.org/stable/c/8fa90634ec3e9cc50f42dd605eec60f2d146ced8 https://git.kernel.org/stable/c/c4a09fdac625e64abe478dcf88bfa20406616928 https://git.kernel.org/stable/c/d31c8721e816eff5ca6573cc487754f357c093cd https://git.kernel.org/stable/c/f3e4963566f58726d3265a727116a42b591f6596

Frequently Asked Questions

What is CVE-2024-26685? +
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. It has a CVSS v3.1 base score of 5.5 (MEDIUM).
How severe is CVE-2024-26685? +
CVE-2024-26685 has a CVSS v3.1 score of 5.5 out of 10, rated MEDIUM. This is a medium-severity vulnerability that should be remediated as part of regular maintenance.
What products are affected by CVE-2024-26685? +
CVE-2024-26685 affects products from debian, linux, specifically: debian_linux, linux_kernel. Check the affected products table above for specific version ranges.
How do I check if I'm vulnerable to CVE-2024-26685? +
You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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