VulnSocial

CVE-2026-42488Disclosure

LOWCVSS 8.1 · HIGH

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

Some shadow paging errors paths will switch the page-tables without updating the currently running vCPU reference. This causes a mismatch between the loaded page-tables and the mapcache metadata which can lead to corruption of the mapcache.

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0.5/ 10 priority

Sources & remediation

Other references
Weakness type (CWE)
CWE-119

Priority

LOW

Exploitation

NONE

PoC

NONE

Patch

AVAILABLE

Momentum

STABLE

Threat summary

  • Patch or workaround signal is available
  • 3 mentions across 3 observed days
  • Momentum state: stable

What's happening

  • Patch or workaround mentioned in 1 signal
  • Technical details provided in 3 signals
  • Disclosure: 2 classified signals
  • Peaked 2d ago at 1 mentions (2026-06-09); latest day: 1
  • 3 total mentions across 3 days

Deep dive

Activity timeline3 mentions / 3d
00111Mentions · 2026-06-09: 1Mentions · 2026-06-10: 1Mentions · 2026-06-18: 1Patch / Workaround · 2026-06-10: 1Technical Details · 2026-06-09: 1Technical Details · 2026-06-10: 1Technical Details · 2026-06-18: 106-0906-1006-18
Signal classification2 categories
Disclosure
266.7%
Patch
133.3%
Referenced assets7 URLs
Classification over time
DateTotalLabels
2026-06-091
Disclosure1
2026-06-101
Patch1
2026-06-181
Disclosure1
Full discourse3 posts
  • Anderson Nascimento@andersonc0d3
    Disclosure

    Xen Security Advisory 491 v2 (CVE-2026-42487) - x86 HVM I/O port list traversal https://seclists.org/oss-sec/2026/q2/857 Xen Security Advisory 492 v3 (CVE-2026-42489,CVE-2026-42490) - domctl lock open to abuse https://seclists.org/oss-sec/2026/q2/858 Xen Security Advisory 493 v2 (CVE-2025-10263) - Arm: Completion of memory accesses not guaranteed by completion of a TLBI https://seclists.org/oss-sec/2026/q2/859 Xen Security Advisory 494 v3 (CVE-2026-42488) - x86: mismatched mapcache metadata https://seclists.org/oss-sec/2026/q2/860

    Post summary

    The text lists several Xen Security Advisory entries for multiple CVEs with brief descriptive titles, indicating disclosure of new vulnerabilities, but provides no evidence of PoC, exploit code, active exploitation, or remediation details.

    010143797
    4.2K followersView on X
  • Open Source Security mailing list@oss_security
    Disclosure

    Xen Security Advisory 493 v2 (CVE-2025-10263) - Arm: Completion of memory accesses not guaranteed by completion of a TLBI https://www.openwall.com/lists/oss-security/2026/06/09/13 hardware issue in certain Arm CPU designs 494 v3 (CVE-2026-42488) - x86: mismatched mapcache metadata https://www.openwall.com/lists/oss-security/2026/06/09/14

    Post summary

    The text lists two Xen security advisories with CVE identifiers, providing brief technical descriptions but no PoC, exploit code, or mitigation steps.

    00020297
    4.7K followersView on X
  • ThreatCluster@threatcluster
    Patch

    openSUSE released Xen security fixes for CVE-2026-42487, CVE-2026-42488, CVE-2026-42489 and CVE-2026-42490, with CVSS scores up to 8.8, according to advisories SUSE-2026-2328 and SUSE-2026-2329. https://threatcluster.io/cluster/opensuse-releases-important-xen-patches-for-multiple-vulnera-d10510c8

    Post summary

    OpenSUSE issued Xen patches for CVE-2026-42487 through CVE-2026-42490, with CVSS scores up to 8.8, per advisories SUSE-2026-2328 and SUSE-2026-2329.

    0000048
    318 followersView on X

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