CVE-2026-89568
- Source
- https://cve.org/CVERecord?id=CVE-2026-89568
- Import Source
- https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-89568.json
- JSON Data
- https://api.osv.dev/v1/vulns/CVE-2026-89568
- Downstream
- Published
- 2026-09-11T19:44:38Z
- Modified
- 2026-09-13T03:47:19Z
- Summary
- kho: fix size calculation in kho_preserved_memory_reserve()
- Details
-
In the Linux kernel, the following vulnerability has been resolved:
kho: fix size calculation in kho_preserved_memory_reserve()
kho_preserved_memory_reserve() calculates the size of a preservation by doing 1 << (order + PAGE_SHIFT). Since the '1' is a 32-bit integer, it can only be shifted by 31. That is, it will only work for preservations up to 2 GiB. Larger preservations will trigger undefined behaviour.
While preservations larger than 2 GiB can't be obtained via folios currently, they can be obtained via kho_preserve_pages().
For example, memblock reserve_mem uses kho_preserve_pages(). Reservations larger than 2 GiB are valid and will trigger this bug if properly aligned.
Fix it by using 1UL for shifting.
- Database specific
{ "cna_assigner": "Linux", "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/89xxx/CVE-2026-89568.json" }- References
-
- https://git.kernel.org/stable/c/3a0b8fa2eb36afc88b62a95f33f0c77c71fa5ded
- https://git.kernel.org/stable/c/42a6f03cf352eb6e6dbeef95e75e686f4cdb9bd1
- https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/89xxx/CVE-2026-89568.json
- https://nvd.nist.gov/vuln/detail/CVE-2026-89568
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git