CVE-2024-26643

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.

Weakness

The product does not properly acquire or release a lock on a resource, leading to unexpected resource state changes and behaviors.

Affected Software

Extended Description

Locking is a type of synchronization behavior that ensures that multiple independently-operating processes or threads do not interfere with each other when accessing the same resource. All processes/threads are expected to follow the same steps for locking. If these steps are not followed precisely - or if no locking is done at all - then another process/thread could modify the shared resource in a way that is not visible or predictable to the original process. This can lead to data or memory corruption, denial of service, etc.

Potential Mitigations

Related Attack Patterns

• https://cwe.mitre.org/data/definitions/25.html
• https://cwe.mitre.org/data/definitions/26.html
• https://cwe.mitre.org/data/definitions/27.html

References

• https://git.kernel.org/stable/c/291cca35818bd52a407bc37ab45a15816039e363
• https://git.kernel.org/stable/c/406b0241d0eb598a0b330ab20ae325537d8d8163
• https://git.kernel.org/stable/c/5224afbc30c3ca9ba23e752f0f138729b2c48dd8
• https://git.kernel.org/stable/c/552705a3650bbf46a22b1adedc1b04181490fc36
• https://git.kernel.org/stable/c/b2d6f9a5b1cf968f1eaa71085ceeb09c2cb276b1
• https://git.kernel.org/stable/c/d75a589bb92af1abf3b779cfcd1977ca11b27033
• https://git.kernel.org/stable/c/e2d45f467096e931044f0ab7634499879d851a5c
• https://git.kernel.org/stable/c/edcf1a3f182ecf8b6b805f0ce90570ea98c5f6bf
• https://git.kernel.org/stable/c/291cca35818bd52a407bc37ab45a15816039e363
• https://git.kernel.org/stable/c/406b0241d0eb598a0b330ab20ae325537d8d8163
• https://git.kernel.org/stable/c/5224afbc30c3ca9ba23e752f0f138729b2c48dd8
• https://git.kernel.org/stable/c/552705a3650bbf46a22b1adedc1b04181490fc36
• https://git.kernel.org/stable/c/b2d6f9a5b1cf968f1eaa71085ceeb09c2cb276b1
• https://git.kernel.org/stable/c/d75a589bb92af1abf3b779cfcd1977ca11b27033
• https://git.kernel.org/stable/c/e2d45f467096e931044f0ab7634499879d851a5c
• https://git.kernel.org/stable/c/edcf1a3f182ecf8b6b805f0ce90570ea98c5f6bf
• https://lists.debian.org/debian-lts-announce/2024/06/msg00017.html