PT-2026-34887 · Linux · Linux Kernel

Published 2026-04-24 · Updated 2026-04-29 · CVE-2026-31535

Positive Technologies (AI Summary)

CVSS v3.1

4.7

Medium

Base vector

AV:L/AC:H/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 A race condition exists in the SMB client logic used for managing receive credits. The process of counting posted recv io and granted credits is flawed because a peer may consume a credit before the hardware receives the incoming receive and the recv done() function processes the completion. This creates a window where credits are granted that do not actually exist.

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

Time Of Check To Time Of Use

Weakness Enumeration

CWE-367

Related Identifiers

CVE-2026-31535

Affected Products

Linux Kernel

References · 11

• https://osv.dev/vulnerability/UBUNTU-CVE-2026-31535 · Vendor Advisory
• https://git.kernel.org/stable/c/f664e6e8a81103cb45c8802a9bc7499e0902c458 · Patch
• https://git.kernel.org/stable/c/9911b1ed187a770a43950bf51f340ad4b7beecba · Patch
• https://git.kernel.org/stable/c/be8845ad5d6558703d20567d8702155598325db8 · Patch
• https://osv.dev/vulnerability/DEBIAN-CVE-2026-31535 · Vendor Advisory
• https://security-tracker.debian.org/tracker/CVE-2026-31535 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-31535 · Security Note
• https://cve.org/CVERecord?id=CVE-2026-31535 · Security Note
• https://ubuntu.com/security/CVE-2026-31535 · Vendor Advisory
• https://twitter.com/CVEnew/status/2048099286672445933 · Twitter Post
• https://git.kernel.org/linus/9911b1ed187a770a43950bf51f340ad4b7beecba · Note