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CVE-2026-74514: KVM: s390: pci: Fix memory accounting for pinned/unpinned pages

• Severity: unknown
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-08-15 · updated 2026-08-23

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. [borntraeger@linux.ibm.com: Fixed whitespace]

Affected products

• Linux kernel: 6.0 — fixed in 7.2

How to fix

Upgrade to a fixed version: Linux kernel 7.2. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/36f6999ecde3976731a8bfc0b8e667da6f593069
• https://git.kernel.org/stable/c/47cfd75d9df7c8f425b0d769328fe43a8a8e606e
• https://git.kernel.org/stable/c/70871b121f81d08879363cb1238a4c85c5c2800c
• https://git.kernel.org/stable/c/ad1c2ac7f15b224cf9ab26b593caa9bd1a4be72e
• https://git.kernel.org/stable/c/dc7465a364104526c56b922c9de9dfcc08a7d5f7
• https://git.kernel.org/stable/c/e3f732e086e438c52c7400bd2734bb166aa4752c

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