Bug 2502383 (CVE-2026-63940) - CVE-2026-63940 kernel: KVM: SEV: Ignore Port I/O requests of length '0'
Summary: CVE-2026-63940 kernel: KVM: SEV: Ignore Port I/O requests of length '0'
Keywords:
Status: NEW
Alias: CVE-2026-63940
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
medium
medium
Target Milestone: ---
Assignee: Product Security
QA Contact:
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2026-07-19 16:05 UTC by OSIDB Bzimport
Modified: 2026-07-21 21:57 UTC (History)
2 users (show)

Fixed In Version:
Clone Of:
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Description OSIDB Bzimport 2026-07-19 16:05:05 UTC 
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.
Comment 1 Keith Grant 2026-07-21 21:55:50 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2026071952-CVE-2026-63940-904d@gregkh/T
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