CVE-2026-89918

CVE CVE-2026-89918EUVD EUVD-2026-80518Published 2026-09-16T10:32:13.000ZLast changed 2026-09-16T14:40:10.000ZCVSS 9.3

What the advisory describes

In the Linux kernel, the following vulnerability has been resolved: KVM: arm64: Correctly handle end of VA space TLBI invalidation Our TLB invalidation by VA code is based on comparing two ranges, one defined by the TLB, and one defined by the TLBI instruction. Each range is defined by a start and a size. However, the way the comparison is done doesn't account for address rollover, as it compares an address with (base + size). This works nicely until this expression represent the last page/block in the TTBR1 VA space, as the result is a big fat 0. And a failed TLB invalidation. Rewrite the comparison in a way that is immune to the address rollover (making the end address inclusive instead of exclusive), and move this into a common helper that is used by both VA and IPA invalidations, as suggested by Hyunwoo Kim (although the IPA version didn't suffer from this particular problem, obviously).

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 4ffa72ad8f37e73bbb6c0baa88557bcb4fd39929 <c624731ca6fe59ad8909ce4108301aa7560a91d6; 4ffa72ad8f37e73bbb6c0baa88557bcb4fd39929 <34af2c3e31f91a739dc175459fdbd99ed952b457; patch: 0; 4ffa72ad8f37e73bbb6c0baa88557bcb4fd39929 <ce447651a52ec077694172af10c4fffb11f56c43; 6.16; patch: 6.18.51; patch: 7.2.5; patch: 7.3-rc1

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

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Linux — Linux

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