VulnSocial

CVE-2026-63938Patch

LOWCVSS 9.3 · CRITICAL

Signal is active with 1 mentions in latest observed window

Immediate actions

  • Patch affected systems immediately

Recommended action window: Monitor and triage in normal cycle

NVD description

In the Linux kernel, the following vulnerability has been resolved: KVM: SEV: Check PSC request indices against the actual size of the buffer When processing Page State Change (PSC) requests, validate the PSC buffer against the effective size of the scratch area, which could be less than the maximum size if the guest provided a pointer that isn't exactly at the start of the GHCB shared buffer.

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0.5/ 10 priority

Sources & remediation

Other references
Weakness type (CWE)
CWE-125

Priority

LOW

Exploitation

NONE

PoC

NONE

Patch

AVAILABLE

Momentum

NONE

Threat summary

  • Patch or workaround signal is available
  • 1 mentions across 1 observed day

What's happening

  • Patch or workaround mentioned in 1 signal
  • Technical details provided in 1 signal
  • 1 total mentions across 1 day

Deep dive

Activity timeline1 mentions / 1d
00111Mentions · 2026-07-23: 1Patch / Workaround · 2026-07-23: 1Technical Details · 2026-07-23: 107-23
Signal classification1 categories
Patch
1100.0%
Full discourse1 post
  • DFIR Lab@DFIR_Lab
    Patch

    🚨 CRITICAL: CVE-2026-63938 | CVSS 9.3 Linux kernel KVM SEV vulnerability allows PSC buffer validation bypass. Local attack vector, no privileges required. Affected: Linux kernel KVM SEV implementations Patch immediately. #CVE #Vulnerability #PatchNow https://t.co/LmfovtWZeP

    Post summary

    CVE‑2026‑63938 is a critical Linux KVM SEV kernel flaw allowing a local PSC buffer validation bypass with no privileges, and a patch is urgently required. No PoC, exploit code, or active exploitation details are present.

    0000042
    91 followersView on X

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