CVE-2026-89961
CVE CVE-2026-89961EUVD EUVD-2026-80561Published 2026-09-16T10:32:43.000ZLast changed 2026-09-16T14:40:41.000ZCVSS 7.8
What the advisory describes
In the Linux kernel, the following vulnerability has been resolved: powerpc/mm: fix wrong addr_pfn tracking in compound vmemmap population vmemmap_populate_compound_pages() uses addr_pfn to determine the PFN offset within a compound page and to decide whether the current vmemmap slot should be populated as a head page mapping or should reuse a tail page mapping. However, addr_pfn is advanced manually in parallel with addr. The loop itself progresses in vmemmap address space, so each PAGE_SIZE step in addr covers PAGE_SIZE / sizeof(struct page) struct page slots. Since addr_pfn is compared against nr_pages in data-PFN units, it should advance by the same number of PFNs. The existing manual increments do not match that and therefore do not reliably track the PFN corresponding to the current addr. As a result, pfn_offset can be computed from the wrong PFN and the code can make the head/tail decision for the wrong compound-page position. Fix this by deriving addr_pfn directly from the current vmemmap address instead of carrying it as loop state.
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: 6.6.157; patch: 7.3-rc1; f2b79c0d79683d552369bb9a7282c1f0226fc566 <7968852a7ca3ce81477ec5b4494a28d612f35a97; patch: 6.18.51; f2b79c0d79683d552369bb9a7282c1f0226fc566 <e163c7184acf36ac20a248498f4a16016057ca01; f2b79c0d79683d552369bb9a7282c1f0226fc566 <9c914b7a0bd18834505c65f22225ce22c152b2d9; patch: 6.12.110; f2b79c0d79683d552369bb9a7282c1f0226fc566 <89a4ae32764172468dea303eb6ae90fe6c859712; 6.6; patch: 0; patch: 7.2.5; f2b79c0d79683d552369bb9a7282c1f0226fc566 <b96be860673f9fbbf12cdadb0b25fc4d6d4d207f
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
Does this concern one of your customers?
This page cannot answer that — it does not know your estate. Whoever has recorded their environments gets the answer the morning after publication, together with a paragraph they can forward to the customer unedited.
Try it for 28 daysPatchlage reports hits and suspected hits. About everything else this system says nothing — neither this page nor the situation report ever claims that an estate is safe.