PT-2026-29722 · Linux · Linux Kernel

Published 2026-04-02 · Updated 2026-04-03 · CVE-2026-23415

Positive Technologies (AI Summary)

CVSS v3.1

7.8

High

Base vector

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

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

Description A use-after-free issue exists in the Linux kernel related to futex functionality, specifically between futex key to node opt() and vma replace policy(). The issue occurs when vma->vm policy is read speculatively under a memory management lock and Read-Copy-Update (RCU). Simultaneously, mbind() may call vma replace policy(), which frees the old memory policy immediately. This creates a race condition where futex key to node() dereferences a freed memory policy pointer, leading to a use-after-free read of mpol->mode. This can lead to a kernel crash.

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

Use After Free

Weakness Enumeration

CWE-416

Related Identifiers

CVE-2026-23415

Affected Products

Linux Kernel

References · 13

• https://security-tracker.debian.org/tracker/CVE-2026-23415 · Vendor Advisory
• https://git.kernel.org/stable/c/853f70c67d1b37e368fdcb3e328c4b8c04f53ac0 · Patch
• https://ubuntu.com/security/CVE-2026-23415 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-23415 · Security Note
• https://cve.org/CVERecord?id=CVE-2026-23415 · Security Note
• https://git.kernel.org/stable/c/7e196194ea27bd49adf3551e2aceb83498eb73fe · Patch
• https://osv.dev/vulnerability/DEBIAN-CVE-2026-23415 · Vendor Advisory
• https://git.kernel.org/stable/c/190a8c48ff623c3d67cb295b4536a660db2012aa · Patch
• https://osv.dev/vulnerability/UBUNTU-CVE-2026-23415 · Vendor Advisory
• https://twitter.com/CVEnew/status/2039744367267664259 · Twitter Post
• https://git.kernel.org/linus/190a8c48ff623c3d67cb295b4536a660db2012aa · Note
• https://twitter.com/cyberbivash/status/2039697522059321789 · Twitter Post
• https://twitter.com/vuldb/status/2039689579767493073 · Twitter Post