Shrinker accounting corruption via pinned-buffer state changes
Published Oct 28, 2026 · Updated Oct 28, 2026
Accounting corruption in the Xe driver in Linux 7.1 allows local users to corrupt page counts via buffer-state changes. The xe_bo_set_purgeable_shrinker() function transfers pages between shrinker counters even when a pinned buffer's pages have already been excluded, causing underflow and persistent overcounting after unpinning. The trigger requires changing a pinned buffer's purgeable state, such as marking a mapped scanout buffer DONTNEED; the disclosure establishes accounting corruption, not a demonstrated crash or privilege escalation.
Summary
What happened
Accounting corruption in the Xe driver in Linux 7.1 allows local users to corrupt page counts via buffer-state changes. The xe_bo_set_purgeable_shrinker() function transfers pages between shrinker counters even when a pinned buffer's pages have already been excluded, causing underflow and persistent overcounting after unpinning. The trigger requires changing a pinned buffer's purgeable state, such as marking a mapped scanout buffer DONTNEED; the disclosure establishes accounting corruption, not a demonstrated crash or privilege escalation.
The record
- CVE
- CVE-2026-99145
- Published
- Oct 28, 2026
- Updated
- Oct 28, 2026
- Vendor
- The Linux Kernel Organization
- Product
- Linux
- Classifications
- Unavailable
- Attack vector
- local
- Privileges
- Unavailable
Timeline
How it unfolded
- Oct 28, 2026CVE publishedPublication date reported by the CVE source.
- Oct 28, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
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- Affected versionversion=536a2ead3a8f2048643da3e8340a4d73fdf71903 <135e998dd1e66b8854db7bd356b6563baf8b9d51
- Affected versionversion=536a2ead3a8f2048643da3e8340a4d73fdf71903 <ffbfd3f98f4393e91dffce3a46ccb7cf5329cf2f
- Affected versionversion=7.1
What conditions does exploitation require?
What is affected?
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Attacks
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Activity data is delayed. The latest report is Sep 28, 2026.
Weakness, pattern, technique
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Public exploit references
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Technologies
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