Bug 2391069 (CVE-2025-38518)

Summary: CVE-2025-38518 kernel: x86/CPU/AMD: Disable INVLPGB on Zen2
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
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OS: Linux   
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Description OSIDB Bzimport 2025-08-26 15:09:54 UTC 
In the Linux kernel, the following vulnerability has been resolved:

x86/CPU/AMD: Disable INVLPGB on Zen2

AMD Cyan Skillfish (Family 17h, Model 47h, Stepping 0h) has an issue
that causes system oopses and panics when performing TLB flush using
INVLPGB.

However, the problem is that that machine has misconfigured CPUID and
should not report the INVLPGB bit in the first place. So zap the
kernel's representation of the flag so that nothing gets confused.

  [ bp: Massage. ]
Comment 1 Jon Moroney 2025-08-26 15:44:24 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2025081653-CVE-2025-38518-2b55@gregkh/T