CVE-2024-26739: net/sched: act_mirred: don't override retval if we already lost the skb
First published: Wed Apr 03 2024(Updated: )
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.
Credit: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
| Affected Software | Affected Version | How to fix |
|---|---|---|
| redhat/kernel | <6.6.19 | 6.6.19 |
| redhat/kernel | <6.7.7 | 6.7.7 |
| redhat/kernel | <6.8 | 6.8 |
| Linux kernel | >=4.19<6.6.19 | |
| Linux kernel | >=6.7<6.7.7 | |
| Linux kernel | =6.8-rc1 | |
| Linux kernel | =6.8-rc2 | |
| Linux kernel | =6.8-rc3 | |
| Linux kernel | =6.8-rc4 |
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Reference Links
- https://git.kernel.org/stable/c/166c2c8a6a4dc2e4ceba9e10cfe81c3e469e3210
- https://git.kernel.org/stable/c/28cdbbd38a4413b8eff53399b3f872fd4e80db9d
- https://git.kernel.org/stable/c/f4e294bbdca8ac8757db436fc82214f3882fc7e7
- https://access.redhat.com/security/cve/CVE-2024-26739
- https://lore.kernel.org/linux-cve-announce/2024040300-CVE-2024-26739-170e@gregkh/T
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=2273271
- https://access.redhat.com/errata/RHSA-2024:4823
- https://access.redhat.com/errata/RHSA-2024:4831
- https://access.redhat.com/errata/RHSA-2024:6997
- https://bugzilla.redhat.com/show_bug.cgi?id=2273270
Frequently Asked Questions
What is the severity of CVE-2024-26739?
CVE-2024-26739 has been classified as a medium severity vulnerability in the Linux kernel.
How do I fix CVE-2024-26739?
To fix CVE-2024-26739, update your kernel to versions 6.6.19, 6.7.7, or 6.8.
Which Linux kernel versions are affected by CVE-2024-26739?
CVE-2024-26739 affects Linux kernel versions prior to 6.6.19, 6.7.7, and all pre-release versions of 6.8.
What components are vulnerable in CVE-2024-26739?
The vulnerable component in CVE-2024-26739 is the net/sched function in the Linux kernel.
Is there a workaround for CVE-2024-26739?
Currently, the recommended solution for CVE-2024-26739 is to apply the available patches by updating the kernel.
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