SB20260626186 - Race condition in Linux kernel mm

Description

This security bulletin contains information about 1 vulnerability.

1) Race condition (CVE-ID: CVE-2026-53162)

CWE-ID: CWE-362 - Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')

CVSSv4: CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:N/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear

The vulnerability allows a local attacker to cause memory corruption.

The vulnerability exists due to memory corruption in refill_stock in mm/memcontrol.c when memcg charge draining occurs in nmi context. A local attacker can trigger re-entry into the random subsystem during an NMI to cause memory corruption.

The issue occurs because get_random_u32_below() is not reentrant- or NMI-safe and may corrupt per-cpu ChaCha batch state during a mid-update recursion.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/00731bd7e18f182a32ca54d6b176eaa470b51ed7
• https://git.kernel.org/stable/c/89bd8215e25aa6999cc51696da418e0d422bc5e0
• https://git.kernel.org/stable/c/c0cafe24d3f6534294c4b2bc2d47734ff7cbd313