CVE-2023-52596: linux kernel Memory Corruption — Fix

Description

In the Linux kernel, the following vulnerability has been resolved: sysctl: Fix out of bounds access for empty sysctl registers When registering tables to the sysctl subsystem there is a check to see if header is a permanently empty directory (used for mounts). This check evaluates the first element of the ctl_table. This results in an out of bounds evaluation when registering empty directories. The function register_sysctl_mount_point now passes a ctl_table of size 1 instead of size 0. It now relies solely on the type to identify a permanently empty register. Make sure that the ctl_table has at least one element before testing for permanent emptiness.

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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-787 Out-of-bounds Write

Affected Products

Vendor	Product	Versions
linux	linux_kernel	< 6.6.16
linux	linux_kernel	6.7 — 6.7.4

References

Advisories & Patches

https://git.kernel.org/stable/c/15893975e9e382f8294ea8d926f08dc2d8d39ede https://git.kernel.org/stable/c/2ae7081bc10123b187e36a4f3a8e53768de31489 https://git.kernel.org/stable/c/315552310c7de92baea4e570967066569937a843 https://git.kernel.org/stable/c/15893975e9e382f8294ea8d926f08dc2d8d39ede https://git.kernel.org/stable/c/2ae7081bc10123b187e36a4f3a8e53768de31489 https://git.kernel.org/stable/c/315552310c7de92baea4e570967066569937a843

Frequently Asked Questions

What is CVE-2023-52596? +

In the Linux kernel, the following vulnerability has been resolved: sysctl: Fix out of bounds access for empty sysctl registers When registering tables to the sysctl subsystem there is a check to see if header is a permanently empty directory (used for mounts). This check evaluates the first element of the ctl_table. This results in an out of bounds evaluation when registering empty directories. The function register_sysctl_mount_point now passes a ctl_table of size 1 instead of size 0. It now relies solely on the type to identify a permanently empty register. Make sure that the ctl_table has at least one element before testing for permanent emptiness. It has a CVSS v3.1 base score of 5.5 (MEDIUM).

How severe is CVE-2023-52596? +

CVE-2023-52596 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-2023-52596? +

CVE-2023-52596 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-2023-52596? +

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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