CVE-2024-26955 nilfs2: prevent kernel bug at submit_bh_wbc()

What is CVE-2024-26955?

CVE-2024-26955 is a high-severity vulnerability in Debian Debian Linux, published on 1 May 2024. It can only be exploited from the same machine or local network, with no action from the victim.

Official description

In the Linux kernel, the following vulnerability has been resolved:

nilfs2: prevent kernel bug at submit_bh_wbc()

Fix a bug where nilfs_get_block() returns a successful status when searching and inserting the specified block both fail inconsistently. If this inconsistent behavior is not due to a previously fixed bug, then an unexpected race is occurring, so return a temporary error -EAGAIN instead.

This prevents callers such as __block_write_begin_int() from requesting a read into a buffer that is not mapped, which would cause the BUG_ON check for the BH_Mapped flag in submit_bh_wbc() to fail.

Which versions are affected by CVE-2024-26955?

It affects 2 products.

Products include Debian Debian Linux, Linux kernel.

How do I fix CVE-2024-26955?

Apply the vendor's patch.

Is CVE-2024-26955 being exploited?

There is no known exploitation of CVE-2024-26955 in the wild and no public exploit code.

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All Debian Debian Linux vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as BELL-CVE-2024-26955, DEBIAN-CVE-2024-26955, GHSA-9mvv-jgf2-gj5c, UBUNTU-CVE-2024-26955.