PT-2026-34362 · Linux · Linux Kernel

Published 2026-04-22 · Updated 2026-04-23 · CVE-2026-31457

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 A NULL pointer dereference occurs in the Linux kernel when damon sysfs repeat call fn() calls damon sysfs upd tuned intervals(), damon sysfs upd schemes stats(), and damon sysfs upd schemes effective quotas() without verifying the contexts->nr value. If the nr contexts variable is set to 0 via sysfs while DAMON is active, the system attempts to dereference contexts arr[0], leading to a crash.

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

NULL Pointer Dereference

Weakness Enumeration

CWE-476

Related Identifiers

CVE-2026-31457

Affected Products

Linux Kernel

References · 11

• https://osv.dev/vulnerability/UBUNTU-CVE-2026-31457 · Vendor Advisory
• https://git.kernel.org/stable/c/3527e9fdc38570cea0f6ddb7a2c9303d4044b217 · Patch
• https://cve.org/CVERecord?id=CVE-2026-31457 · Security Note
• https://security-tracker.debian.org/tracker/CVE-2026-31457 · Vendor Advisory
• https://osv.dev/vulnerability/DEBIAN-CVE-2026-31457 · Vendor Advisory
• https://git.kernel.org/stable/c/6557004a8b59c7701e695f02be03c7e20ed1cc15 · Patch
• https://git.kernel.org/stable/c/652cd0641a763dd0e846b0d12814977fadb2b7d8 · Patch
• https://ubuntu.com/security/CVE-2026-31457 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-31457 · Security Note
• https://twitter.com/CVEnew/status/2046980031767777521 · Twitter Post
• https://git.kernel.org/linus/6557004a8b59c7701e695f02be03c7e20ed1cc15 · Note