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]
Metrics
No CVSS score has been published yet.
Affected software
Source: the vendor's advisory (CNA). NVD analysis pending.
| Vendor | Product | Versions |
|---|---|---|
| Linux | Linux | >= 3c5a1b6f0a18520a0edd0600fef6f1a8553b8fdc, < ad1c2ac7f15b224cf9ab26b593caa9bd1a4be72e; >= 3c5a1b6f0a18520a0edd0600fef6f1a8553b8fdc, < dc7465a364104526c56b922c9de9dfcc08a7d5f7; >= 3c5a1b6f0a18520a0edd0600fef6f1a8553b8fdc, < 47cfd75d9df7c8f425b0d769328fe43a8a8e606e; >= 3c5a1b6f0a18520a0edd0600fef6f1a8553b8fdc, < 70871b121f81d08879363cb1238a4c85c5c2800c; >= 3c5a1b6f0a18520a0edd0600fef6f1a8553b8fdc, < e3f732e086e438c52c7400bd2734bb166aa4752c; >= 3c5a1b6f0a18520a0edd0600fef6f1a8553b8fdc, < 36f6999ecde3976731a8bfc0b8e667da6f593069 |
| Linux | Linux | 6.0 |
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
Timeline
- Published
- Aug 15, 2026
- Last modified
- Aug 23, 2026
- NVD status
- Received