CVE-2024-56603: linux kernel Use-After-Free — Fix

Description

In the Linux kernel, the following vulnerability has been resolved: net: af_can: do not leave a dangling sk pointer in can_create() On error can_create() frees the allocated sk object, but sock_init_data() has already attached it to the provided sock object. This will leave a dangling sk pointer in the sock object and may cause use-after-free later.

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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	< 5.4.287
linux	linux_kernel	5.5 — 5.10.231
linux	linux_kernel	5.11 — 5.15.174
linux	linux_kernel	5.16 — 6.1.120
linux	linux_kernel	6.2 — 6.6.66
linux	linux_kernel	6.7 — 6.12.5

References

Advisories & Patches

https://git.kernel.org/stable/c/1fe625f12d090d69f3f084990c7e4c1ff94bfe5f https://git.kernel.org/stable/c/5947c9ac08f0771ea8ed64186b0d52e9029cb6c0 https://git.kernel.org/stable/c/811a7ca7320c062e15d0f5b171fe6ad8592d1434 https://git.kernel.org/stable/c/884ae8bcee749be43a071d6ed2d89058dbd2425c https://git.kernel.org/stable/c/8df832e6b945e1ba61467d7f1c9305e314ae92fe https://git.kernel.org/stable/c/ce39b5576785bb3e66591145aad03d66bc3e778d https://git.kernel.org/stable/c/db207d19adbac96058685f6257720906ad41d215

Other References

https://lists.debian.org/debian-lts-announce/2025/03/msg00001.html https://lists.debian.org/debian-lts-announce/2025/03/msg00002.html

Frequently Asked Questions

What is CVE-2024-56603? +

In the Linux kernel, the following vulnerability has been resolved: net: af_can: do not leave a dangling sk pointer in can_create() On error can_create() frees the allocated sk object, but sock_init_data() has already attached it to the provided sock object. This will leave a dangling sk pointer in the sock object and may cause use-after-free later. It has a CVSS v3.1 base score of 7.8 (HIGH).

How severe is CVE-2024-56603? +

CVE-2024-56603 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-2024-56603? +

CVE-2024-56603 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-2024-56603? +

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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