CVE-2024-36244: linux kernel — Fix

Description

In the Linux kernel, the following vulnerability has been resolved: net/sched: taprio: extend minimum interval restriction to entire cycle too It is possible for syzbot to side-step the restriction imposed by the blamed commit in the Fixes: tag, because the taprio UAPI permits a cycle-time different from (and potentially shorter than) the sum of entry intervals. We need one more restriction, which is that the cycle time itself must be larger than N * ETH_ZLEN bit times, where N is the number of schedule entries. This restriction needs to apply regardless of whether the cycle time came from the user or was the implicit, auto-calculated value, so we move the existing "cycle == 0" check outside the "if "(!new->cycle_time)" branch. This way covers both conditions and scenarios. Add a selftest which illustrates the issue triggered by syzbot.

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CVSS v3.1 Score

5.5

MEDIUM

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

Affected Products

Vendor	Product	Versions
linux	linux_kernel	5.4.68 — 5.5
linux	linux_kernel	5.8.12 — 5.9
linux	linux_kernel	5.9.1 — 6.1.119
linux	linux_kernel	6.2 — 6.6.33
linux	linux_kernel	6.7 — 6.9.4
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/34d83c3e6e97867ae061d14eb52123404aab1cbc https://git.kernel.org/stable/c/91f249b01fe490fce11fbb4307952ca8cce78724 https://git.kernel.org/stable/c/b939d1e04a90248b4cdf417b0969c270ceb992b2 https://git.kernel.org/stable/c/fb66df20a7201e60f2b13d7f95d031b31a8831d3 https://git.kernel.org/stable/c/91f249b01fe490fce11fbb4307952ca8cce78724 https://git.kernel.org/stable/c/b939d1e04a90248b4cdf417b0969c270ceb992b2 https://git.kernel.org/stable/c/fb66df20a7201e60f2b13d7f95d031b31a8831d3

Other References

https://lists.debian.org/debian-lts-announce/2025/01/msg00001.html

Frequently Asked Questions

What is CVE-2024-36244? +

In the Linux kernel, the following vulnerability has been resolved: net/sched: taprio: extend minimum interval restriction to entire cycle too It is possible for syzbot to side-step the restriction imposed by the blamed commit in the Fixes: tag, because the taprio UAPI permits a cycle-time different from (and potentially shorter than) the sum of entry intervals. We need one more restriction, which is that the cycle time itself must be larger than N * ETH_ZLEN bit times, where N is the number of schedule entries. This restriction needs to apply regardless of whether the cycle time came from the user or was the implicit, auto-calculated value, so we move the existing "cycle == 0" check outside the "if "(!new->cycle_time)" branch. This way covers both conditions and scenarios. Add a selftest which illustrates the issue triggered by syzbot. It has a CVSS v3.1 base score of 5.5 (MEDIUM).

How severe is CVE-2024-36244? +

CVE-2024-36244 has a CVSS v3.1 score of 5.5 out of 10, rated MEDIUM. This is a medium-severity vulnerability that should be remediated as part of regular maintenance.

What products are affected by CVE-2024-36244? +

CVE-2024-36244 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-2024-36244? +

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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CVE-2024-36244