KVM: SEV: Ignore Port I/O requests of length '0'
- Published
- Last modified
- Where the record stands: published, rejected by its publisher, or superseded by another id.What do these mean? →
- published
- Whether CISA lists it in its Known Exploited Vulnerabilities catalog: proof that attackers are using it.What do these mean? →
- Not listed in CISA KEV
- Fix
- Fixed in 6.6.160, 6.12.95, 6.18.35, 7.0.12
- Whether working attack code is public (Exploit-DB, Metasploit, Nuclei or GitHub). Public code makes attacks easier.What do these mean? →
- None on Exploit-DB, Metasploit or GitHub
- Exploitation: none
- Automatable: no
- Technical impact: total
Summary
The Linux kernel's KVM (Kernel-based Virtual Machine) subsystem, specifically its AMD SEV (Secure Encrypted Virtualization) support, is affected. The flaw involves handling of zero-length port I/O requests, which could cause length calculations to underflow in the scratch area setup code, potentially leading to incorrect memory handling or kernel instability in affected virtual machines.
Summarized by anthropic/claude-haiku-5.5. Verify details against the original sources.
Read the original description
In the Linux kernel, the following vulnerability has been resolved: KVM: SEV: Ignore Port I/O requests of length '0' Explicitly ignore Port I/O requests of length '0' (or count '0'), so that setting up the software scratch area (and other code) doesn't have to worry about underflowing the length, and to allow for WARNing on trying to configure the scratch area with len==0.
Timeline
- CVE published
- CISA SSVC assessment
Exploitation: none · Automatable: no · Technical impact: total
- Record last updated
Affected versions
- Linux Linux
Version range not reported
- Linux Linux
5.11
- KernelLinux
From 5.11.0 · fixed in 6.6.160; From 6.7.0 · fixed in 6.12.95; From 6.13.0 · fixed in 6.18.35; From 6.19.0 · fixed in 7.0.12