Linux Kernel cxl_region cxl_cancel_auto_attach out-of-bounds

Summaryinfo

A vulnerability classified as very critical has been found in Linux Kernel. Affected is the function cxl_cancel_auto_attach of the component cxl_region. This manipulation causes out-of-bounds. This vulnerability is registered as CVE-2026-74275. The attack needs to be launched locally. No exploit is available.

Detailsinfo

A vulnerability has been found in Linux Kernel (version now known) and classified as very critical. Affected by this vulnerability is the function cxl_cancel_auto_attach of the component cxl_region. The manipulation with an unknown input leads to a out-of-bounds vulnerability. The CWE definition for the vulnerability is CWE-125. The product reads data past the end, or before the beginning, of the intended buffer. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

In the Linux kernel, the following vulnerability has been resolved: cxl/region: Fix out-of-bounds access in cxl_cancel_auto_attach() In cxl_cancel_auto_attach(), it assumes cxled->pos is a valid index for accessing p->targets[]. However, cxled->pos can be set to negative errno in cxl_region_sort_targets() if cxl_calc_interleave_pos() fails. This causes the driver to use a negative index to access p->targets[], resulting in out-of-bounds access. Fix it by walking p->targets[] instead of using cxled->pos directly.

It is possible to read the advisory at git.kernel.org. This vulnerability is known as CVE-2026-74275 since 08/15/2026. The exploitation appears to be easy. Attacking locally is a requirement. The exploitation requires an enhanced level of successful authentication. Technical details of the vulnerability are known, but there is no available exploit. The pricing for an exploit might be around USD $0-$5k at the moment (estimation calculated on 08/15/2026).

Applying the patch 44b2397eb67b7f728640989a22d062e41f94ab64/cbda6a2c2bec2a5fb30a2ce85baeab15b5fc7db3 is able to eliminate this problem.

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Productinfo

Type

• Operating System

Vendor

• Linux

Name

• Kernel

License

• open-source

Website

• Vendor: https://www.kernel.org/

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