CVE-2026-89568
CVE CVE-2026-89568EUVD EUVD-2026-76479Published 2026-09-11T19:44:38.000Z
What the advisory describes
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.
Source: EUVD (ENISA), in the words of the advisory.
Products the advisory names
These come from the advisory itself, not from any check we performed.
- Linux — Linux patch: 7.2.4; patch: 0; patch: 7.3-rc1; fc33e4b44b2717feba2f6f07ce7943a96499c9ec <42a6f03cf352eb6e6dbeef95e75e686f4cdb9bd1; fc33e4b44b2717feba2f6f07ce7943a96499c9ec <3a0b8fa2eb36afc88b62a95f33f0c77c71fa5ded; 6.16
The versions shown are the advisory's own. Patchlage compares no version numbers and derives no judgement from them — which version is installed is something a person has to look up.
Carried in the product catalogue
An estate covering these products can be recorded in Patchlage. An advisory about them appears in the next morning's situation report.
- Linux — Linux
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