CVE-2026-74514

Technical Description

In the Linux kernel, the following vulnerability has been resolved:

KVM: s390: pci: Fix memory accounting for pinned/unpinned pages

The account_mem() and unaccount_mem() functions call get_uid() which

increments the reference count of struct user_struct on every invocation.

But we don't decrement the count by calling free_uid(). It also

accounted/unaccounted the pages against the current->mm. But its possible

the unaccount_mem() can be called from a different process context than the

one that originally pinned the pages.

Let's fix this by storing the pinning process user_struct and mm_struct

when accounting for pinned pages, and subsequently free these resources

when the pages are unpinned.

[[email protected]: Fixed whitespace]

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References