CVE-2024-26643

/// Technical description

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

netfilter: nf_tables: mark set as dead when unbinding anonymous set with timeout

While the rhashtable set gc runs asynchronously, a race allows it to

collect elements from anonymous sets with timeouts while it is being

released from the commit path.

Mingi Cho originally reported this issue in a different path in 6.1.x

with a pipapo set with low timeouts which is not possible upstream since

7395dfacfff6 ("netfilter: nf_tables: use timestamp to check for set

element timeout").

Fix this by setting on the dead flag for anonymous sets to skip async gc

in this case.

According to 08e4c8c5919f ("netfilter: nf_tables: mark newset as dead on

transaction abort"), Florian plans to accelerate abort path by releasing

objects via workqueue, therefore, this sets on the dead flag for abort

path too.

/// Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

/// References