SB2026091227 - Operation on a Resource after Expiration or Release in Linux kernel mm

Description

This security bulletin contains information about 1 vulnerability.

1) Operation on a Resource after Expiration or Release (CVE-ID: CVE-2026-89755)

CWE-ID: CWE-672 - Operation on a Resource after Expiration or Release

CVSSv4: 6.8 [CVSS:4.0/AV:L/AC:L/AT:N/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 stale mapping use in __migrate_device_pages() when migrating device pages after freeing swapcache. A local user can trigger device-page migration involving a folio removed from the swap cache to cause a denial of service.

The issue can occur after a large folio is split into order-0 folios.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/34a00895d032a414830d41106a09329ae6c251b6
• https://git.kernel.org/stable/c/8ffedc6573a665cdc31ebe47eae7b32b78d0df83