CVE-2024-26739 Affecting kernel-rt package, versions <0:5.14.0-427.37.1.el9_4
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Test your applications- Snyk ID SNYK-ALMALINUX9-KERNELRT-8324344
- published 4 Nov 2024
- disclosed 24 Sep 2024
Introduced: 24 Sep 2024
CVE-2024-26739 Open this link in a new tabHow to fix?
Upgrade AlmaLinux:9 kernel-rt to version 0:5.14.0-427.37.1.el9_4 or higher.
This issue was patched in ALSA-2024:6997.
NVD Description
Note: Versions mentioned in the description apply only to the upstream kernel-rt package and not the kernel-rt package as distributed by AlmaLinux.
See How to fix? for AlmaLinux:9 relevant fixed versions and status.
In the Linux kernel, the following vulnerability has been resolved:
net/sched: act_mirred: don't override retval if we already lost the skb
If we're redirecting the skb, and haven't called tcf_mirred_forward(), yet, we need to tell the core to drop the skb by setting the retcode to SHOT. If we have called tcf_mirred_forward(), however, the skb is out of our hands and returning SHOT will lead to UaF.
Move the retval override to the error path which actually need it.
References
- https://errata.almalinux.org/9/ALSA-2024-6997.html
- https://access.redhat.com/security/cve/CVE-2024-26739
- https://access.redhat.com/errata/RHSA-2024:6997
- https://git.kernel.org/stable/c/166c2c8a6a4dc2e4ceba9e10cfe81c3e469e3210
- https://git.kernel.org/stable/c/28cdbbd38a4413b8eff53399b3f872fd4e80db9d
- https://git.kernel.org/stable/c/f4e294bbdca8ac8757db436fc82214f3882fc7e7