EUVD-2026-103553
GHSA-2qhr-3xrg-mw89
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In the Linux kernel, the following vulnerability has been resolved:
KVM: riscv: Fix NACL hfence entry update order
The SBI v3.0 specification (section 15.1.2) requires a nested HFENCE entry to be populated as follows:
- find an unused entry with Config.Pending == 0
- update the Page_Number and Page_Count words
- update the Config word with Config.Pending set
__kvm_riscv_nacl_hfence() writes the Config word first, so the SBI implementation (or NACL hardware) can observe a pending entry with pnum/pcount values left over from the previous use of that entry, resulting in incorrect TLB flush ranges.
Write pnum and pcount first and the Config word last. Since the consumer is an external agent on coherent shared memory, use WRITE_ONCE() to stop the compiler from reordering the stores and smp_wmb() to make the parameter words globally visible before the Pending bit is set.
Affected VersionsENISA
Affected Packages
Source: OSV (Open Source Vulnerabilities)
Affects your stack
Affects 1 package in euvd
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2Threat Intelligence Overview
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Attack Technique
Information disclosure occurs when an application unintentionally exposes sensitive data that aids attackers in reconnaissance or directly compromises security.
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