CVE-2026-74514
Low risk· EPSS 7%Exploitation Probability (EPSS)
Low risk7th percentile - higher than 7% of all known CVEs
Summary
In the Linux kernel, in the KVM subsystem for s390 architecture in PCI handling, a memory accounting issue was found 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 free_uid() is not called to decrement it. Additionally, accounting is done against current->mm, which may be incorrect when unaccount_mem() is called from a different process context than the one that originally pinned the pages. The fix stores the pinning process's user_struct and mm_struct and frees these resources when unpinning.
Risk Assessment
Incorrect memory accounting may lead to memory leaks and improper functioning of memory limits, which could be exploited to exhaust system resources.
Recommendation
Apply a Linux kernel update containing the fix for CVE-2026-74514. Monitor memory usage on systems with KVM/s390.
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Original NVD description (English source)
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]