CVE-2026-72279KVM: arm64: nv: Respect read-only PFN when mapping L1 VNCR
Updated under an hour ago ()
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No exploitation reported and no EPSS estimate yet.
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In 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.
- CVSS
- 9.0 CRITICAL (v3.1, CNA)CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:N/I:H/A:H
- Weakness (CWE)
- Not given
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Linux
- NVD analysis
- Received
- Record last updated
- Aug 17, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Linux Linux linux:linux (from the name) | from 2a359e072596fcb2e9e85017a865e3618a2fe5b5 before 5c50db5bcbb9073cb2fd97be51b962de92f429e9; from 2a359e072596fcb2e9e85017a865e3618a2fe5b5 before d35defbdfcb15296ebe28968ad7452c1a8c11cea; from 2a359e072596fcb2e9e85017a865e3618a2fe5b5 before 2684e02bac41c5220f6c1ab2bdcc957b71812977 | CNA record |
References
- https://git.kernel.org/stable/c/5c50db5bcbb9073cb2fd97be51b962de92f429e9
- https://git.kernel.org/stable/c/d35defbdfcb15296ebe28968ad7452c1a8c11cea
- https://git.kernel.org/stable/c/2684e02bac41c5220f6c1ab2bdcc957b71812977
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.