PT-2026-34435 · Linux · Linux Kernel

Published 2026-04-22 · Updated 2026-04-25 · CVE-2026-31530

Positive Technologies (AI Summary)

CVSS v3.1

7.8

High

Base vector

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

Name of the Vulnerable Software and Affected Versions Linux kernel (affected versions not specified)

Description A use after free issue exists in the cxl detach ep() function. This occurs during bottom-up removal when CXL memory devices beneath a switch port are removed. The issue arises because there is no lifetime guarantee between a child port and its parent port, leading to two scenarios where parent port may be accessed after being freed: first, during concurrent detach operations where a port may be processed by another worker before being unlocked; and second, when delete switch port() triggers a cascade of unregistrations that may free the parent port before it is unlocked.

Recommendations At the moment, there is no information about a newer version that contains a fix for this vulnerability.

Use After Free

Weakness Enumeration

CWE-416

Related Identifiers

CVE-2026-31530

Affected Products

Linux Kernel

References · 15

• https://git.kernel.org/stable/c/2c32141462045cf93d54a5146a0ba572b83533dd · Patch
• https://osv.dev/vulnerability/UBUNTU-CVE-2026-31530 · Vendor Advisory
• https://osv.dev/vulnerability/BELL-CVE-2026-31530 · Vendor Advisory
• https://cve.org/CVERecord?id=CVE-2026-31530 · Security Note
• https://nvd.nist.gov/vuln/detail/CVE-2026-31530 · Security Note
• https://git.kernel.org/stable/c/f7dc6f381a1e5f068333f1faa9265d6af1df4235 · Patch
• https://git.kernel.org/stable/c/19d2f0b97a131198efc2c4ca3eb7f980bba8c2b4 · Patch
• https://osv.dev/vulnerability/DEBIAN-CVE-2026-31530 · Vendor Advisory
• https://ubuntu.com/security/CVE-2026-31530 · Vendor Advisory
• https://security-tracker.debian.org/tracker/CVE-2026-31530 · Vendor Advisory
• https://git.kernel.org/stable/c/d216a4bd138eb57cc4ae7c43b2f709e3482af7e2 · Patch
• https://twitter.com/CVEnew/status/2046979936670359946 · Twitter Post
• https://docs.bell-sw.com/security/cves/CVE-2026-31530 · Note
• https://git.kernel.org/linus/19d2f0b97a131198efc2c4ca3eb7f980bba8c2b4 · Note
• https://twitter.com/VulmonFeeds/status/2047004506345337112 · Twitter Post