GHSA-3627-JJWG-8VFW
Vulnerability from github – Published: 2026-08-15 06:32 – Updated: 2026-08-17 06:33In the Linux kernel, the following vulnerability has been resolved:
KVM: arm64: nv: Respect read-only PFN when mapping L1 VNCR
KVM currently maps the L1 VNCR into the host stage-1 by relying entirely on the permissions of the guest stage-1. At the same time, it is entirely possible that the backing PFN is read-only (e.g. RO memslot), meaning that the L1 VNCR should use at most a read-only mapping.
Cache the writability of the PFN in the VNCR TLB and use it to constrain the resulting fixmap permissions. Promote VNCR permission faults to an SEA in the case where the guest attempts to write to a read-only endpoint. Conveniently, this also plugs a page leak found by Sashiko [*] resulting from the early return for a read-only PFN.
{
"affected": [],
"aliases": [
"CVE-2026-72279"
],
"database_specific": {
"cwe_ids": [],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2026-08-15T06:21:58Z",
"severity": "CRITICAL"
},
"details": "In the Linux kernel, the following vulnerability has been resolved:\n\nKVM: arm64: nv: Respect read-only PFN when mapping L1 VNCR\n\nKVM currently maps the L1 VNCR into the host stage-1 by relying entirely\non the permissions of the guest stage-1. At the same time, it is\nentirely possible that the backing PFN is read-only (e.g. RO memslot),\nmeaning that the L1 VNCR should use at most a read-only mapping.\n\nCache the writability of the PFN in the VNCR TLB and use it to constrain\nthe resulting fixmap permissions. Promote VNCR permission faults to an\nSEA in the case where the guest attempts to write to a read-only\nendpoint. Conveniently, this also plugs a page leak found by Sashiko [*]\nresulting from the early return for a read-only PFN.",
"id": "GHSA-3627-jjwg-8vfw",
"modified": "2026-08-17T06:33:21Z",
"published": "2026-08-15T06:32:18Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-72279"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/2684e02bac41c5220f6c1ab2bdcc957b71812977"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/5c50db5bcbb9073cb2fd97be51b962de92f429e9"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/d35defbdfcb15296ebe28968ad7452c1a8c11cea"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:N/I:H/A:H",
"type": "CVSS_V3"
}
]
}
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