PT-2026-34992 · Linux · Linux Kernel

Published 2026-04-24 · Updated 2026-04-28 · CVE-2026-31640

Positive Technologies (AI Summary)

CVSS v3.1

7.5

High

Base vector

AV:N/AC:L/PR:N/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 An issue exists in the rxrpc post response() function where the code incorrectly uses the newer packet private data instead of the challenge serial number from the cached response when deciding whether to switch to a newer response. This causes the comparison to always be false. The fix involves ensuring the older packet is checked and that the new packet substitutes the old one if it is newer, while releasing the unused packet.

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

Memory Leak

Weakness Enumeration

CWE-401

Related Identifiers

CVE-2026-31640

Affected Products

Linux Kernel

References · 12

• https://ubuntu.com/security/CVE-2026-31640 · Vendor Advisory
• https://osv.dev/vulnerability/DEBIAN-CVE-2026-31640 · Vendor Advisory
• https://security-tracker.debian.org/tracker/CVE-2026-31640 · Vendor Advisory
• https://cve.org/CVERecord?id=CVE-2026-31640 · Security Note
• https://git.kernel.org/stable/c/9132b1a7bf83b4a8042fffbc99d075b727a16742 · Patch
• https://git.kernel.org/stable/c/20386e7f8d97475b8d815873e246423317ec4260 · Patch
• https://osv.dev/vulnerability/UBUNTU-CVE-2026-31640 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-31640 · Security Note
• https://git.kernel.org/stable/c/b33f5741bb187db8ff32e8f5b96def77cc94dfca · Patch
• https://twitter.com/VulmonFeeds/status/2047785101262504130 · Twitter Post
• https://twitter.com/CVEnew/status/2047731943697985757 · Twitter Post
• https://git.kernel.org/linus/b33f5741bb187db8ff32e8f5b96def77cc94dfca · Note