GHSA-HCQ6-HVJH-VF66
Vulnerability from github – Published: 2026-09-16 12:30 – Updated: 2026-09-16 15:31In 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).
{
"affected": [],
"aliases": [
"CVE-2026-89918"
],
"database_specific": {
"cwe_ids": [],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2026-09-16T11:17:00Z",
"severity": "CRITICAL"
},
"details": "In the Linux kernel, the following vulnerability has been resolved:\n\nKVM: arm64: Correctly handle end of VA space TLBI invalidation\n\nOur TLB invalidation by VA code is based on comparing two ranges,\none defined by the TLB, and one defined by the TLBI instruction.\n\nEach range is defined by a start and a size. However, the way the\ncomparison is done doesn\u0027t account for address rollover, as it\ncompares an address with (base + size). This works nicely until\nthis expression represent the last page/block in the TTBR1 VA space,\nas the result is a big fat 0. And a failed TLB invalidation.\n\nRewrite the comparison in a way that is immune to the address\nrollover (making the end address inclusive instead of exclusive),\nand move this into a common helper that is used by both VA and IPA\ninvalidations, as suggested by Hyunwoo Kim (although the IPA version\ndidn\u0027t suffer from this particular problem, obviously).",
"id": "GHSA-hcq6-hvjh-vf66",
"modified": "2026-09-16T15:31:02Z",
"published": "2026-09-16T12:30:41Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-89918"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/34af2c3e31f91a739dc175459fdbd99ed952b457"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/c624731ca6fe59ad8909ce4108301aa7560a91d6"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/ce447651a52ec077694172af10c4fffb11f56c43"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H",
"type": "CVSS_V3"
}
]
}
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