PT-2024-11404 · Linux+6 · Linux Kernel+6
Syzbot
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Published
2021-09-17
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Updated
2024-11-01
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CVE-2021-47408
CVSS v3.1
5.5
Medium
| Vector | AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H |
Name of the Vulnerable Software and Affected Versions
Linux kernel (affected versions not specified)
Description
The vulnerability is related to the netfilter conntrack module in the Linux kernel. Syzbot was able to trigger a warning by running two scripts in parallel, changing conntrack hash sizes. This caused the
nf ct iterate cleanup() function to restart every time a resize happened, leading to a delay of over 5 minutes for net namespace structures to be cleaned up. The patch adds a mutex to serialize hash resizes and cleanups, making get next corpse() faster by skipping over empty buckets. This patch also speeds up network namespace dismantles.Recommendations
At the moment, there is no information about a newer version that contains a fix for this vulnerability.
Exploit
Improper Locking
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Weakness Enumeration
Related Identifiers
Affected Products
Almalinux
Astra Linux
Centos
Linux Kernel
Red Hat
Rocky Linux
Suse