Red Hat Security Advisory: kernel security update

Fixed packages 48

Vulnerabilities 2

• High 8.8
  CVE-2026-64562

  KVM: nVMX: Hide shadow VMCS right after VMCLEAR

  In the Linux kernel, the following vulnerability has been resolved: KVM: nVMX: Hide shadow VMCS right after VMCLEAR free_nested() frees the shadow VMCS while vmcs01 still points to it. But because it is asynchronous with respect to loaded_vmcs_clear(), the vC…

  Linux Linux linux-raspi2 linux-hwe Linux Debian Ubuntu Azure Linux
  Aug 4, 2026
• High 7.9
  CVE-2025-40026

  KVM: x86: Don't (re)check L1 intercepts when completing userspace I/O

  In the Linux kernel, the following vulnerability has been resolved: KVM: x86: Don't (re)check L1 intercepts when completing userspace I/O When completing emulation of instruction that generated a userspace exit for I/O, don't recheck L1 intercepts as KVM has …

  Linux Linux linux-raspi2 linux-hwe Linux Debian Ubuntu
  Oct 28, 2025

References

• article
  https://access.redhat.com/security/updates/classification/#moderate
• report
  https://bugzilla.redhat.com/show_bug.cgi?id=2406712
• advisory
  https://security.access.redhat.com/data/csaf/v2/advisories/2026/rhsa-2026_68131.json
• report
  https://access.redhat.com/security/cve/CVE-2025-40026
• advisory
  https://www.cve.org/CVERecord?id=CVE-2025-40026
• advisory
  https://nvd.nist.gov/vuln/detail/CVE-2025-40026
• article
  https://lore.kernel.org/linux-cve-announce/2025102841-CVE-2025-40026-760b@gregkh/T
• report
  https://access.redhat.com/security/cve/CVE-2026-64562
• report
  https://bugzilla.redhat.com/show_bug.cgi?id=2510894
• advisory
  https://www.cve.org/CVERecord?id=CVE-2026-64562
• advisory
  https://nvd.nist.gov/vuln/detail/CVE-2026-64562
• article
  https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-64562.mbox