Bug 2516779 (CVE-2026-74275)

Summary: CVE-2026-74275 kernel: cxl/region: Fix out-of-bounds access in cxl_cancel_auto_attach()
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
Severity: medium Docs Contact:
Priority: medium    
Version: unspecifiedCC: rhel-process-autobot, watson-tool-maintainers
Target Milestone: ---Keywords: Security
Target Release: ---   
Hardware: All   
OS: Linux   
Whiteboard:
Fixed In Version: Doc Type: ---
Doc Text:
A flaw was found in the Linux kernel. A vulnerability exists in the `cxl_cancel_auto_attach()` function where an invalid negative index can be used to access an array. This out-of-bounds memory access could allow a local attacker to cause system instability or a denial of service (DoS).
 Story Points: ---
Clone Of: Environment:
Last Closed: Type: ---
Regression: --- Mount Type: ---
Documentation: --- CRM:
Verified Versions: Category: ---
oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
Embargoed:

Description OSIDB Bzimport 2026-08-15 06:33:04 UTC 
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.
Comment 1 Keith Grant 2026-08-20 13:43:18 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2026081545-CVE-2026-74275-f5c0@gregkh/T