UBUNTU-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.
02 / AFFECTED SOFTWARE
Affected packages
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45 explicit affected versions
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03 / CONNECTIONS
Connected vulnerabilities
04 / EVIDENCE
Source records
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.
05 / REFERENCES
Further evidence
- https://git.kernel.org/stable/c/552705a3650bbf46a22b1adedc1b04181490fc36
- https://ubuntu.com/security/CVE-2024-26643
- https://ubuntu.com/security/notices/USN-6868-1
- https://ubuntu.com/security/notices/USN-6868-2
- https://ubuntu.com/security/notices/USN-6869-1
- https://ubuntu.com/security/notices/USN-6870-1
- https://ubuntu.com/security/notices/USN-6870-2
- https://ubuntu.com/security/notices/USN-6871-1
- https://ubuntu.com/security/notices/USN-6872-1
- https://ubuntu.com/security/notices/USN-6872-2
- https://ubuntu.com/security/notices/USN-6873-1
- https://ubuntu.com/security/notices/USN-6873-2
- https://ubuntu.com/security/notices/USN-6874-1
- https://ubuntu.com/security/notices/USN-6892-1
- https://ubuntu.com/security/notices/USN-6896-1
- https://ubuntu.com/security/notices/USN-6900-1
- https://ubuntu.com/security/notices/USN-6919-1
- https://ubuntu.com/security/notices/USN-6927-1
- https://www.cve.org/CVERecord?id=CVE-2024-26643