PT-2026-30127 · Linux · Linux Kernel

Published 2026-04-03 · Updated 2026-04-03 · CVE-2026-23432

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 mshv map user memory() function within the Linux kernel. Specifically, in the error path of this function, directly calling vfree() on a memory region leaves the MMU notifier registered. Subsequently, when userspace unmaps the memory, the registered notifier triggers and attempts to access the already freed region, leading to a use-after-free condition and a potential kernel panic.

Recommendations Replace the call to vfree() with mshv partition put() to ensure the MMU notifier is unregistered before the memory region is freed.

Fix

Use After Free

Weakness Enumeration

CWE-416

Related Identifiers

CVE-2026-23432

Affected Products

Linux Kernel

References · 10

• https://security-tracker.debian.org/tracker/CVE-2026-23432 · Vendor Advisory
• https://git.kernel.org/stable/c/34861bdc0c0196b6c2dd48f7454029407704ff6e · Patch
• https://git.kernel.org/stable/c/6922db250422a0dfee34de322f86b7a73d713d33 · Patch
• https://osv.dev/vulnerability/UBUNTU-CVE-2026-23432 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-23432 · Security Note
• https://osv.dev/vulnerability/DEBIAN-CVE-2026-23432 · Vendor Advisory
• https://cve.org/CVERecord?id=CVE-2026-23432 · Security Note
• https://ubuntu.com/security/CVE-2026-23432 · Vendor Advisory
• https://twitter.com/CVEnew/status/2040111901322232231 · Twitter Post
• https://git.kernel.org/linus/6922db250422a0dfee34de322f86b7a73d713d33 · Note