Use of Uninitialized Resource Affecting kernel-tools-libs-devel package, versions *
Threat Intelligence
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Test your applications- Snyk IDSNYK-RHEL10-KERNELTOOLSLIBSDEVEL-14437540
- published17 Dec 2025
- disclosed16 Dec 2025
Introduced: 16 Dec 2025
NewCVE-2025-68292 (opens in a new tab)How to fix?
There is no fixed version for RHEL:10 kernel-tools-libs-devel.
NVD Description
Note: Versions mentioned in the description apply only to the upstream kernel-tools-libs-devel package and not the kernel-tools-libs-devel package as distributed by RHEL.
See How to fix? for RHEL:10 relevant fixed versions and status.
In the Linux kernel, the following vulnerability has been resolved:
mm/memfd: fix information leak in hugetlb folios
When allocating hugetlb folios for memfd, three initialization steps are missing:
- Folios are not zeroed, leading to kernel memory disclosure to userspace
- Folios are not marked uptodate before adding to page cache
- hugetlb_fault_mutex is not taken before hugetlb_add_to_page_cache()
The memfd allocation path bypasses the normal page fault handler (hugetlb_no_page) which would handle all of these initialization steps. This is problematic especially for udmabuf use cases where folios are pinned and directly accessed by userspace via DMA.
Fix by matching the initialization pattern used in hugetlb_no_page():
- Zero the folio using folio_zero_user() which is optimized for huge pages
- Mark it uptodate with folio_mark_uptodate()
- Take hugetlb_fault_mutex before adding to page cache to prevent races
The folio_zero_user() change also fixes a potential security issue where uninitialized kernel memory could be disclosed to userspace through read() or mmap() operations on the memfd.
References
- https://bugzilla.redhat.com/show_bug.cgi?id=2422803
- https://access.redhat.com/security/cve/CVE-2025-68292
- https://git.kernel.org/stable/c/50b4c1c28733a536d637d2f0401d60bcfef60ef2
- https://git.kernel.org/stable/c/b09d7c4dc642849d9a96753233c6d00364017fd6
- https://git.kernel.org/stable/c/de8798965fd0d9a6c47fc2ac57767ec32de12b49