CVE-2024-26828: linux kernel Integer Underflow — Fix

Description

In the Linux kernel, the following vulnerability has been resolved: cifs: fix underflow in parse_server_interfaces() In this loop, we step through the buffer and after each item we check if the size_left is greater than the minimum size we need. However, the problem is that "bytes_left" is type ssize_t while sizeof() is type size_t. That means that because of type promotion, the comparison is done as an unsigned and if we have negative bytes left the loop continues instead of ending.

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CVSS v3.1 Score

6.7

MEDIUM

CVSS:3.1/AV:A/AC:L/PR:L/UI:R/S:U/C:N/I:H/A:H

Weakness Type (CWE)

CWE-191 CWE-191

Affected Products

Vendor	Product	Versions
linux	linux_kernel	4.18 — 6.1.79
linux	linux_kernel	6.2 — 6.6.18
linux	linux_kernel	6.7 — 6.7.6
linux	linux_kernel	All
linux	linux_kernel	All
linux	linux_kernel	All
linux	linux_kernel	All

References

Advisories & Patches

https://git.kernel.org/stable/c/7190353835b4a219abb70f90b06cdcae97f11512 https://git.kernel.org/stable/c/cffe487026be13eaf37ea28b783d9638ab147204 https://git.kernel.org/stable/c/df2af9fdbc4ddde18a3371c4ca1a86596e8be301 https://git.kernel.org/stable/c/f7ff1c89fb6e9610d2b01c1821727729e6609308 https://git.kernel.org/stable/c/7190353835b4a219abb70f90b06cdcae97f11512 https://git.kernel.org/stable/c/cffe487026be13eaf37ea28b783d9638ab147204 https://git.kernel.org/stable/c/df2af9fdbc4ddde18a3371c4ca1a86596e8be301 https://git.kernel.org/stable/c/f7ff1c89fb6e9610d2b01c1821727729e6609308

Frequently Asked Questions

What is CVE-2024-26828? +

In the Linux kernel, the following vulnerability has been resolved: cifs: fix underflow in parse_server_interfaces() In this loop, we step through the buffer and after each item we check if the size_left is greater than the minimum size we need. However, the problem is that "bytes_left" is type ssize_t while sizeof() is type size_t. That means that because of type promotion, the comparison is done as an unsigned and if we have negative bytes left the loop continues instead of ending. It has a CVSS v3.1 base score of 6.7 (MEDIUM).

How severe is CVE-2024-26828? +

CVE-2024-26828 has a CVSS v3.1 score of 6.7 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-2024-26828? +

CVE-2024-26828 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-2024-26828? +

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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