PT-2026-31306 · Linux · Linux Kernel

Published 2026-04-08 · Updated 2026-05-20 · CVE-2026-31411

Positive Technologies (AI Summary)

CVSS v3.1

5.5

Medium

Base vector

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

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

Description The Linux kernel contains a flaw in the ATM send path (sendmsg -> vcc sendmsg -> sigd send). The system reads the vcc pointer from msg->vcc without validation, and this pointer originates from user space via sendmsg(), making it susceptible to forgery. A malicious daemon can send arbitrary pointer values. This can lead to a crash due to the kernel dereferencing an invalid pointer. The issue is addressed by introducing find get vcc(), which validates the pointer by searching vcc hash and acquiring a reference using sock hold() if found.

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

Untrusted Pointer Dereference

NULL Pointer Dereference

Weakness Enumeration

CWE-822

CWE-476

Related Identifiers

BDU:2026-05019

CVE-2026-31411

ECHO-B1F9-EB75-9DEC

Affected Products

Linux Kernel

References · 28

• https://git.kernel.org/stable/c/ae88a5d2f29b69819dc7b04086734439d074a643 · Patch
• https://git.kernel.org/stable/c/e3f80666c2739296c3b69a127300455c43aa1067 · Patch
• https://git.kernel.org/stable/c/c96549d07dfdd51aadf0722cfb40711574424840 · Patch
• https://osv.dev/vulnerability/ROOT-OS-UBUNTU-2204-CVE-2026-31411 · Vendor Advisory
• https://osv.dev/vulnerability/UBUNTU-CVE-2026-31411 · Vendor Advisory
• https://linux.oracle.com/errata/ELSA-2026-50260.html · Vendor Advisory
• https://git.kernel.org/stable/c/69d3f9ee5489e6e8b66defcfa226e91d82393297 · Patch
• https://osv.dev/vulnerability/DEBIAN-CVE-2026-31411 · Vendor Advisory
• https://git.kernel.org/stable/c/1c8bda3df028d5e54134077dcd09f46ca8cfceb5 · Patch
• https://bdu.fstec.ru/vul/2026-05019 · Security Note
• https://ubuntu.com/security/CVE-2026-31411 · Vendor Advisory
• https://security-tracker.debian.org/tracker/CVE-2026-31411 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-31411 · Security Note
• https://cve.org/CVERecord?id=CVE-2026-31411 · Security Note
• https://osv.dev/vulnerability/BELL-CVE-2026-31411 · Vendor Advisory