CVE-2025-37823: debian linux Use-After-Free — Fix

Description

In the Linux kernel, the following vulnerability has been resolved: net_sched: hfsc: Fix a potential UAF in hfsc_dequeue() too Similarly to the previous patch, we need to safe guard hfsc_dequeue() too. But for this one, we don't have a reliable reproducer.

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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-416 Use After Free

Affected Products

Vendor	Product	Versions
linux	linux_kernel	2.6.13 — 5.4.293
linux	linux_kernel	5.5 — 5.10.237
linux	linux_kernel	5.11 — 5.15.181
linux	linux_kernel	5.16 — 6.1.136
linux	linux_kernel	6.2 — 6.6.89
linux	linux_kernel	6.7 — 6.12.26
linux	linux_kernel	6.13 — 6.14.5
linux	linux_kernel	All
linux	linux_kernel	All
linux	linux_kernel	All
linux	linux_kernel	All
linux	linux_kernel	All
linux	linux_kernel	All
linux	linux_kernel	All
linux	linux_kernel	All
debian	debian_linux	All

References

Advisories & Patches

https://git.kernel.org/stable/c/11bccb054c1462fb069219f8e98e97a5a730758e https://git.kernel.org/stable/c/2f46d14919c39528c6e540ebc43f90055993eedc https://git.kernel.org/stable/c/68f256305ceb426d545a0dc31f83c2ab1d211a1e https://git.kernel.org/stable/c/6ccbda44e2cc3d26fd22af54c650d6d5d801addf https://git.kernel.org/stable/c/76c4c22c2437d3d3880efc0f62eca06ef078d290 https://git.kernel.org/stable/c/c6936266f8bf98a53f28ef9a820e6a501e946d09 https://git.kernel.org/stable/c/c6f035044104c6ff656f4565cd22938dc892528c https://git.kernel.org/stable/c/da7936518996d290e2fcfcaf6cd7e15bfd87804a

Other References

https://lists.debian.org/debian-lts-announce/2025/05/msg00030.html https://lists.debian.org/debian-lts-announce/2025/05/msg00045.html

Frequently Asked Questions

What is CVE-2025-37823? +

In the Linux kernel, the following vulnerability has been resolved: net_sched: hfsc: Fix a potential UAF in hfsc_dequeue() too Similarly to the previous patch, we need to safe guard hfsc_dequeue() too. But for this one, we don't have a reliable reproducer. It has a CVSS v3.1 base score of 7.8 (HIGH).

How severe is CVE-2025-37823? +

CVE-2025-37823 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-2025-37823? +

CVE-2025-37823 affects products from debian, linux, specifically: debian_linux, linux_kernel. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2025-37823? +

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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