PT-2026-27692 · Linux · Linux Kernel

Published 2026-01-01 · Updated 2026-04-20 · CVE-2026-23327

Positive Technologies (AI Summary)

CVSS v3.1

7.1

High

Base vector

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

Name of the Vulnerable Software and Affected Versions Linux kernel versions prior to 6.19.0

Description The Linux kernel contains a flaw in the cxl/mbox subsystem. Specifically, the cxl payload from user allowed() function casts and dereferences input payload data without first verifying its size. This can lead to a read-access violation when a raw mailbox command is sent with an undersized payload, such as a 1-byte payload for an operation expecting a 16-byte UUID. This results in reading past the allocated buffer, triggering a kernel memory safety issue.

Recommendations Update to Linux kernel version 6.19.0 or later.

Exploit

Fix

Out of bounds Read

Weakness Enumeration

CWE-125

Related Identifiers

CVE-2026-23327

Affected Products

Linux Kernel

References · 16

• 🔥 https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/23xxx/CVE-2026-23327.json · Exploit
• https://git.kernel.org/stable/c/7c8a7b7f063b7e7ae9bba4cbaa14a5d2fe3a55e1 · Patch
• https://osv.dev/vulnerability/DEBIAN-CVE-2026-23327 · Vendor Advisory
• https://osv.dev/vulnerability/UBUNTU-CVE-2026-23327 · Vendor Advisory
• https://cve.org/CVERecord?id=CVE-2026-23327 · Security Note
• https://osv.dev/vulnerability/ROOT-OS-UBUNTU-2404-CVE-2026-23327 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-23327 · Security Note
• https://security-tracker.debian.org/tracker/CVE-2026-23327 · Vendor Advisory
• https://osv.dev/vulnerability/CVE-2026-23327 · Vendor Advisory
• https://ubuntu.com/security/CVE-2026-23327 · Vendor Advisory
• https://git.kernel.org/stable/c/60b5d1f68338aff2c5af0113f04aefa7169c50c2 · Patch
• https://osv.dev/vulnerability/BELL-CVE-2026-23327 · Vendor Advisory
• https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git · Note
• https://twitter.com/CVEnew/status/2036763522219094270 · Twitter Post
• https://git.kernel.org/linus/60b5d1f68338aff2c5af0113f04aefa7169c50c2 · Note