SB20260925170 - Race condition in Linux kernel mm

Description

This security bulletin contains information about 1 vulnerability.

1) Race condition (CVE-ID: CVE-2026-93217)

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

CVSSv4: 5.7 [CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]

The vulnerability allows a local user to cause a denial of service.

The vulnerability exists due to a race condition in madvise_cold_or_pageout_pte_range() when processing MADV_COLD or MADV_PAGEOUT requests concurrently with device-private PMD migration. A local user can trigger the race to cause a denial of service.

The issue can occur when an HMM-based GPU driver changes a PMD to a device-private entry while the memory-advice operation is in progress.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/5c0d7b658cda62cd17cb3652783386d5608030ef
• https://git.kernel.org/stable/c/d4b76d0b03cb49611312ecc4bcfb55ccdf0843e2