CVE-2024-26723: linux kernel DoS — Fix

Description

In the Linux kernel, the following vulnerability has been resolved: lan966x: Fix crash when adding interface under a lag There is a crash when adding one of the lan966x interfaces under a lag interface. The issue can be reproduced like this: ip link add name bond0 type bond miimon 100 mode balance-xor ip link set dev eth0 master bond0 The reason is because when adding a interface under the lag it would go through all the ports and try to figure out which other ports are under that lag interface. And the issue is that lan966x can have ports that are NULL pointer as they are not probed. So then iterating over these ports it would just crash as they are NULL pointers. The fix consists in actually checking for NULL pointers before accessing something from the ports. Like we do in other places.

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CVSS v3.1 Score

7.8

HIGH

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Weakness Type (CWE)

CWE-400 Uncontrolled Resource Consumption

Affected Products

Vendor	Product	Versions
linux	linux_kernel	6.1 — 6.1.79
linux	linux_kernel	6.2 — 6.6.18
linux	linux_kernel	6.7 — 6.7.6
linux	linux_kernel	All
linux	linux_kernel	All
linux	linux_kernel	All
linux	linux_kernel	All

References

Advisories & Patches

https://git.kernel.org/stable/c/15faa1f67ab405d47789d4702f587ec7df7ef03e https://git.kernel.org/stable/c/2a492f01228b7d091dfe38974ef40dccf8f9f2f1 https://git.kernel.org/stable/c/48fae67d837488c87379f0c9f27df7391718477c https://git.kernel.org/stable/c/b9357489c46c7a43999964628db8b47d3a1f8672 https://git.kernel.org/stable/c/15faa1f67ab405d47789d4702f587ec7df7ef03e https://git.kernel.org/stable/c/2a492f01228b7d091dfe38974ef40dccf8f9f2f1 https://git.kernel.org/stable/c/48fae67d837488c87379f0c9f27df7391718477c https://git.kernel.org/stable/c/b9357489c46c7a43999964628db8b47d3a1f8672

Frequently Asked Questions

What is CVE-2024-26723? +

In the Linux kernel, the following vulnerability has been resolved: lan966x: Fix crash when adding interface under a lag There is a crash when adding one of the lan966x interfaces under a lag interface. The issue can be reproduced like this: ip link add name bond0 type bond miimon 100 mode balance-xor ip link set dev eth0 master bond0 The reason is because when adding a interface under the lag it would go through all the ports and try to figure out which other ports are under that lag interface. And the issue is that lan966x can have ports that are NULL pointer as they are not probed. So then iterating over these ports it would just crash as they are NULL pointers. The fix consists in actually checking for NULL pointers before accessing something from the ports. Like we do in other places. It has a CVSS v3.1 base score of 7.8 (HIGH).

How severe is CVE-2024-26723? +

CVE-2024-26723 has a CVSS v3.1 score of 7.8 out of 10, rated HIGH. This is a high-severity vulnerability that should be prioritized for patching.

What products are affected by CVE-2024-26723? +

CVE-2024-26723 affects products from linux, specifically: linux_kernel. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2024-26723? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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