PT-2026-31306 · Linux · Linux Kernel

Published 2026-04-08 · Updated 2026-04-12 · CVE-2026-31411

Positive Technologies (AI Summary)

CVSS v2.0

4.6

Medium

AV:L/AC:L/Au:S/C:N/I:N/A:C

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

Weakness Enumeration

CWE-822

Related Identifiers

BDU:2026-05019

CVE-2026-31411

Affected Products

Linux Kernel

References · 16

• https://nvd.nist.gov/vuln/detail/CVE-2026-31411 · Security Note
• 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://twitter.com/CVEnew/status/2043295657922810022 · Twitter Post
• https://git.kernel.org/stable/c/3e1a8b00095246a9a2b46b57f6d471c6d3c00ed2 · Note
• https://lore.kernel.org/linux-cve-announce/2026040820-CVE-2026-31411-7ef9@gregkh · Note
• https://git.kernel.org/stable/c/e3f80666c2739296c3b69a127300455c43aa1067 · Note
• https://git.kernel.org/stable/c/c96549d07dfdd51aadf0722cfb40711574424840 · Note
• https://git.kernel.org/stable/c/1c8bda3df028d5e54134077dcd09f46ca8cfceb5 · Note
• https://t.me/CVEtracker/50057 · Telegram Post
• https://github.com/advisories/GHSA-9q92-j4jr-j3jp · Note
• https://git.kernel.org/stable/c/21c303fec138c002f90ed33bce60e807d53072bb · Note
• https://git.kernel.org/stable/c/ae88a5d2f29b69819dc7b04086734439d074a643 · Note
• https://git.kernel.org/stable/c/440c9a5fc477a8ee259d8bf669531250b8398651 · Note