CVE-2024-41084: linux kernel Null Dereference — Fix

Description

In the Linux kernel, the following vulnerability has been resolved: cxl/region: Avoid null pointer dereference in region lookup cxl_dpa_to_region() looks up a region based on a memdev and DPA. It wrongly assumes an endpoint found mapping the DPA is also of a fully assembled region. When not true it leads to a null pointer dereference looking up the region name. This appears during testing of region lookup after a failure to assemble a BIOS defined region or if the lookup raced with the assembly of the BIOS defined region. Failure to clean up BIOS defined regions that fail assembly is an issue in itself and a fix to that problem will alleviate some of the impact. It will not alleviate the race condition so let's harden this path. The behavior change is that the kernel oops due to a null pointer dereference is replaced with a dev_dbg() message noting that an endpoint was mapped. Additional comments are added so that future users of this function can more clearly understand what it provides.

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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-476 CWE-476

Affected Products

Vendor	Product	Versions
linux	linux_kernel	6.4 — 6.6.37
linux	linux_kernel	6.7 — 6.9.8

References

Advisories & Patches

https://git.kernel.org/stable/c/285f2a08841432fc3e498b1cd00cce5216cdf189 https://git.kernel.org/stable/c/a9e099e29e925f8b31cfe53e8a786b9796f8e453 https://git.kernel.org/stable/c/b8a40a6dbfb0150c1081384caa9bbe28ce5d5060 https://git.kernel.org/stable/c/285f2a08841432fc3e498b1cd00cce5216cdf189 https://git.kernel.org/stable/c/a9e099e29e925f8b31cfe53e8a786b9796f8e453 https://git.kernel.org/stable/c/b8a40a6dbfb0150c1081384caa9bbe28ce5d5060

Frequently Asked Questions

What is CVE-2024-41084? +

In the Linux kernel, the following vulnerability has been resolved: cxl/region: Avoid null pointer dereference in region lookup cxl_dpa_to_region() looks up a region based on a memdev and DPA. It wrongly assumes an endpoint found mapping the DPA is also of a fully assembled region. When not true it leads to a null pointer dereference looking up the region name. This appears during testing of region lookup after a failure to assemble a BIOS defined region or if the lookup raced with the assembly of the BIOS defined region. Failure to clean up BIOS defined regions that fail assembly is an issue in itself and a fix to that problem will alleviate some of the impact. It will not alleviate the race condition so let's harden this path. The behavior change is that the kernel oops due to a null pointer dereference is replaced with a dev_dbg() message noting that an endpoint was mapped. Additional comments are added so that future users of this function can more clearly understand what it provides. It has a CVSS v3.1 base score of 5.5 (MEDIUM).

How severe is CVE-2024-41084? +

CVE-2024-41084 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-2024-41084? +

CVE-2024-41084 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-2024-41084? +

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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