Host service interruption via lpage_info out-of-bounds read
Published May 1, 2024 · Updated May 11, 2026
Out-of-bounds read in Linux 6.8 x86 KVM allows local users to interrupt host service through crafted guest-memory attributes. The hugepage_has_attrs helper assumes every lower-level huge page has an lpage_info entry and reads beyond the vmalloc array for small, unaligned memslots. Reaching the flaw requires low-privileged local access to a KVM VM with memory-attribute support; the demonstrated result is a KASAN fault without reported data modification.
Summary
What happened
Out-of-bounds read in Linux 6.8 x86 KVM allows local users to interrupt host service through crafted guest-memory attributes. The hugepage_has_attrs helper assumes every lower-level huge page has an lpage_info entry and reads beyond the vmalloc array for small, unaligned memslots. Reaching the flaw requires low-privileged local access to a KVM VM with memory-attribute support; the demonstrated result is a KASAN fault without reported data modification.
The record
- CVE
- CVE-2024-26991
- Published
- May 1, 2024
- Updated
- May 11, 2026
- Vendor
- The Linux Kernel Organization
- Product
- Linux
- Classifications
- CWE-125, T1499.004
- Attack vector
- local
- Privileges
- authenticated
Timeline
How it unfolded
- May 1, 2024CVE publishedPublication date reported by the CVE source.
- May 11, 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?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=6.8
- Affected versionversion=90b4fe17981e155432c4dbc490606d0c2e9c2199 <048cc4a028e635d339687ed968985d2d1669494c
- Affected versionversion=90b4fe17981e155432c4dbc490606d0c2e9c2199 <992b54bd083c5bee24ff7cc35991388ab08598c4
What conditions does exploitation require?
What is affected?
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Public exploit references
- KVM private_mem_conversions_test reproducerproof of concept · demonstrated
Labels summarize the accepted research assessment. They do not indicate a test against your environment.
Technologies
Your stack
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Your stack
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