CVE-2024-56651: linux kernel Use-After-Free — Fix

Description

In the Linux kernel, the following vulnerability has been resolved: can: hi311x: hi3110_can_ist(): fix potential use-after-free The commit a22bd630cfff ("can: hi311x: do not report txerr and rxerr during bus-off") removed the reporting of rxerr and txerr even in case of correct operation (i. e. not bus-off). The error count information added to the CAN frame after netif_rx() is a potential use after free, since there is no guarantee that the skb is in the same state. It might be freed or reused. Fix the issue by postponing the netif_rx() call in case of txerr and rxerr reporting.

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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	4.14.291 — 4.15
linux	linux_kernel	4.19.256 — 4.20
linux	linux_kernel	5.4.211 — 5.5
linux	linux_kernel	5.10.137 — 5.11
linux	linux_kernel	5.15.61 — 5.16
linux	linux_kernel	5.18.18 — 5.19
linux	linux_kernel	5.19.2 — 5.20
linux	linux_kernel	6.0 — 6.1.120
linux	linux_kernel	6.2 — 6.6.66
linux	linux_kernel	6.7 — 6.12.5
linux	linux_kernel	All

References

Advisories & Patches

https://git.kernel.org/stable/c/1128022009444faf49359bd406cd665b177cb643 https://git.kernel.org/stable/c/4ad77eb8f2e07bcfa0e28887d3c7dbb732d92cc1 https://git.kernel.org/stable/c/9ad86d377ef4a19c75a9c639964879a5b25a433b https://git.kernel.org/stable/c/bc30b2fe8c54694f8ae08a5b8a5d174d16d93075

Other References

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

Frequently Asked Questions

What is CVE-2024-56651? +

In the Linux kernel, the following vulnerability has been resolved: can: hi311x: hi3110_can_ist(): fix potential use-after-free The commit a22bd630cfff ("can: hi311x: do not report txerr and rxerr during bus-off") removed the reporting of rxerr and txerr even in case of correct operation (i. e. not bus-off). The error count information added to the CAN frame after netif_rx() is a potential use after free, since there is no guarantee that the skb is in the same state. It might be freed or reused. Fix the issue by postponing the netif_rx() call in case of txerr and rxerr reporting. It has a CVSS v3.1 base score of 7.8 (HIGH).

How severe is CVE-2024-56651? +

CVE-2024-56651 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-2024-56651? +

CVE-2024-56651 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-2024-56651? +

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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