CVE-2024-56720: linux kernel — Fix

Description

In the Linux kernel, the following vulnerability has been resolved: bpf, sockmap: Several fixes to bpf_msg_pop_data Several fixes to bpf_msg_pop_data, 1. In sk_msg_shift_left, we should put_page 2. if (len == 0), return early is better 3. pop the entire sk_msg (last == msg->sg.size) should be supported 4. Fix for the value of variable "a" 5. In sk_msg_shift_left, after shifting, i has already pointed to the next element. Addtional sk_msg_iter_var_next may result in BUG.

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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

Weakness Type (CWE)

CWE-193 CWE-193

CWE-401 CWE-401

Affected Products

Vendor	Product	Versions
linux	linux_kernel	5.0 — 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 — 6.6.64
linux	linux_kernel	6.7 — 6.11.11
linux	linux_kernel	6.12 — 6.12.2

References

Advisories & Patches

https://git.kernel.org/stable/c/275a9f3ef8fabb0cb282a62b9e164dedba7284c5 https://git.kernel.org/stable/c/5d609ba262475db450ba69b8e8a557bd768ac07a https://git.kernel.org/stable/c/785180bed9879680d8e5c5e1b54c8ae8d948f4c8 https://git.kernel.org/stable/c/98c7ea7d11f2588e8197db042e0291e4ac8f8346 https://git.kernel.org/stable/c/d26d977633d1d0b8bf9407278189bd0a8d973323 https://git.kernel.org/stable/c/d3f5763b3062514a234114e97bbde74d8d702449 https://git.kernel.org/stable/c/e1f54c61c4c9a5244eb8159dce60d248f7d97b32 https://git.kernel.org/stable/c/f58d3aa457e77a3d9b3df2ab081dcf9950f6029f

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-2024-56720? +

In the Linux kernel, the following vulnerability has been resolved: bpf, sockmap: Several fixes to bpf_msg_pop_data Several fixes to bpf_msg_pop_data, 1. In sk_msg_shift_left, we should put_page 2. if (len == 0), return early is better 3. pop the entire sk_msg (last == msg->sg.size) should be supported 4. Fix for the value of variable "a" 5. In sk_msg_shift_left, after shifting, i has already pointed to the next element. Addtional sk_msg_iter_var_next may result in BUG. It has a CVSS v3.1 base score of 5.5 (MEDIUM).

How severe is CVE-2024-56720? +

CVE-2024-56720 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-2024-56720? +

CVE-2024-56720 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-2024-56720? +

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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