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CVE-2025-38518

x86/CPU/AMD: Disable INVLPGB on Zen2

MEDIUM
5.5
CVSS Score
Published: August 16, 2025 at 10:55 AM UTC
Updated: June 17, 2026 at 09:17 AM UTC
1 product affected across 1 vendorLinux Kernel

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Severity
MEDIUM5.5
Exploit prediction
EPSS 0.1%

Description

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. ]

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Linux Kernel· Linux
95%
6.15 ≤ v < 6.15.76.15 ≤ v < 6.166.156.16 rc16.16 rc26.16 rc36.16 rc46.16 rc5767ae437a32d644786c0779d0d54492ff9cbe574
Vendor states this is fixed in 357f121517924e3ec3021f9d0dd0189adcd09867 (fixed)
Vendor states this is fixed in a74bb5f202dabddfea96abc1328fcedae8aa140a (fixed)
Vendor states this is fixed in 6.15 (unaffected)
Vendor states this is fixed in 6.15.7 (unaffected)
Vendor states this is fixed in 6.16 (unaffected)

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (2)

Patch
Source: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
https://git.kernel.org/stable/c/357f121517924e3ec3021f9d0dd0189adcd09867
Patch
Source: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
https://git.kernel.org/stable/c/a74bb5f202dabddfea96abc1328fcedae8aa140a

CVSS

5.5MEDIUM[email protected]
Attack Vector
LOCAL
Complexity
LOW
Privileges
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
NONE
Availability
HIGH
Vector?

Quick Info

StatusANALYZED
CWE
NVD-CWE-noinfo

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