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CVE-2024-26643

Disclosure Date: March 21, 2024 •
CVE-2024-26643
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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.

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CVSS V3 Severity and Metrics
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Impact Score:
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Integrity (I):
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Availability (A):
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General Information

Offensive Application
Unknown
Utility Class
Unknown
Ports
Unknown
OS
Unknown
Vulnerable Versions
Linux d75a589bb92a
Linux edcf1a3f182e
Linux e2d45f467096
Linux 291cca35818b
Linux 406b0241d0eb
Linux b2d6f9a5b1cf
Linux not down converted
Prerequisites
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Discovered By
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PoC Author
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Metasploit Module
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Vendors

  • Linux

Products

  • Linux
Technical Analysis