Kernel memory disclosure via uninitialized hugetlb folios
Published Dec 16, 2025 · Updated Dec 16, 2025
Information disclosure in the Linux kernel in Linux 6.11.0 through 6.12.60 and 6.13.0 through 6.17.10 allows local users to read kernel memory. The memfd hugetlb allocation path adds folios to the page cache without zeroing them or marking them uptodate because it bypasses hugetlb_no_page. A local user who can access a hugetlb-backed memfd can recover stale kernel contents through read() or mmap(), with udmabuf-backed DMA making direct access especially relevant.
Summary
What happened
Information disclosure in the Linux kernel in Linux 6.11.0 through 6.12.60 and 6.13.0 through 6.17.10 allows local users to read kernel memory. The memfd hugetlb allocation path adds folios to the page cache without zeroing them or marking them uptodate because it bypasses hugetlb_no_page. A local user who can access a hugetlb-backed memfd can recover stale kernel contents through read() or mmap(), with udmabuf-backed DMA making direct access especially relevant.
The record
- CVE
- CVE-2025-68292
- Published
- Dec 16, 2025
- Updated
- Dec 16, 2025
- Vendor
- The Linux Kernel Organization
- Product
- Linux
- Classifications
- T1005
- Attack vector
- local
- Privileges
- authenticated
Timeline
How it unfolded
- Dec 16, 2025CVE publishedPublication date reported by the CVE source.
- Dec 16, 2025Record 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=6.11
- Affected versionversion=89c1905d9c140372b7f50ef48f42378cf85d9bc5 <50b4c1c28733a536d637d2f0401d60bcfef60ef2
- Affected versionversion=89c1905d9c140372b7f50ef48f42378cf85d9bc5 <b09d7c4dc642849d9a96753233c6d00364017fd6
- Affected versionversion=89c1905d9c140372b7f50ef48f42378cf85d9bc5 <de8798965fd0d9a6c47fc2ac57767ec32de12b49
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
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Weakness, pattern, technique
Public exploit references
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Technologies
Your stack
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Your stack
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