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TI-2026-45851 Aliases CVE-2026-64287GHSA-hfcp-qwvj-9247

KVM: arm64: Bound used_lrs when flushing the pKVM hyp vCPU

Priority LOW 37CWE-125Published · Updated

Key facts

Attack vector
Local
Privileges required
High
User interaction
None
Attack complexity
Low
Impact type
—
Confidentiality · integrity · availability
High · High · High
Fix status
Partial Red Hat: 10 fixed, 1 without a fix

Attack profile from CVSS 3.1 · CNA. Fix status from CNA and Red Hat.

Summary

In the Linux kernel, the following vulnerability has been resolved: KVM: arm64: Bound used_lrs when flushing the pKVM hyp vCPU flush_hyp_vcpu() copies the host vGIC state into the hyp's private vCPU on every run. The vGIC list register save and restore use used_lrs as their loop bound and expect it to stay within the number of implemented list registers. While this is generally the case, flush_hyp_vcpu() copies vgic_v3 verbatim and does not enforce this, so a value provided by the host is used at EL2 to index vgic_lr[] and access ICH_LR<n>_EL2 (host -> EL2). Fix by clamping used_lrs to the number of implemented list registers after the copy, as the trusted path already does in vgic_flush_lr_state(). The number of implemented list registers is constant after init, so it is replicated once from kvm_vgic_global_state.nr_lr into hyp_gicv3_nr_lr rather than read on every entry.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00176 7th percentileScored 2026-11-07
Fix Partial Linux (Linux): 6.6.145, 6.12.97, 6.18.40 +2Red Hat: 2 advisoriesRed Hat: 10 fixed, 1 without a fix

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
LinuxLinux6.2 and later6.6.145, 6.12.97, 6.18.40, 7.1.4, 7.2Patch availableCNA
  • Linux VendorLinux Affected 6.2 and later Fixed in 6.6.145, 6.12.97, 6.18.40, 7.1.4, 7.2 Patch available CNA

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*6.2 to before 6.6.145; 6.7 to before 6.12.97; 6.13 to before 6.18.40; 6.19 to before 7.1.4VulnerableLinux
  • cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* Versions 6.2 to before 6.6.145; 6.7 to before 6.12.97; 6.13 to before 6.18.40; 6.19 to before 7.1.4 Vulnerable ·Linux

Remediation

  • Fix · CNA Linux (Linux) Fixed in 6.6.145, 6.12.97, 6.18.40, 7.1.4, 7.2

Red Hat 2 advisories

  • RHSA-2026:64808 Released 2026-09-08 · Red Hat rating Important
    kernel security update
    • Red Hat Enterprise Linux AppStream (v. 9) kernel-64k-debug-devel-5.14.0-687.45.1.el9_8, kernel-64k-debug-devel-matched-5.14.0-687.45.1.el9_8, kernel-64k-devel-5.14.0-687.45.1.el9_8 +12
    • Red Hat Enterprise Linux BaseOS (v. 9) kernel-5.14.0-687.45.1.el9_8, kernel-64k-5.14.0-687.45.1.el9_8, kernel-64k-core-5.14.0-687.45.1.el9_8 +28
    • Red Hat Enterprise Linux CodeReady Linux Builder (v. 9) kernel-tools-libs-devel-5.14.0-687.45.1.el9_8, libperf-5.14.0-687.45.1.el9_8
    • Red Hat Enterprise Linux Real Time (v. 9) kernel-rt-5.14.0-687.45.1.el9_8, kernel-rt-64k-5.14.0-687.45.1.el9_8, kernel-rt-64k-core-5.14.0-687.45.1.el9_8 +21
    • Red Hat Enterprise Linux Real Time for NFV (v. 9) kernel-rt-5.14.0-687.45.1.el9_8, kernel-rt-core-5.14.0-687.45.1.el9_8, kernel-rt-debug-5.14.0-687.45.1.el9_8 +9
  • RHSA-2026:64775 Released 2026-09-08 · Red Hat rating Important
    kernel security, bug fix, and enhancement update
    • Red Hat Enterprise Linux AppStream (v. 10) kernel-64k-debug-devel-6.12.0-211.52.1.el10_2, kernel-64k-debug-devel-matched-6.12.0-211.52.1.el10_2, kernel-64k-devel-6.12.0-211.52.1.el10_2 +12
    • Red Hat Enterprise Linux BaseOS (v. 10) kernel-6.12.0-211.52.1.el10_2, kernel-64k-6.12.0-211.52.1.el10_2, kernel-64k-core-6.12.0-211.52.1.el10_2 +29
    • Red Hat Enterprise Linux CodeReady Linux Builder (v. 10) kernel-tools-libs-devel-6.12.0-211.52.1.el10_2, libperf-6.12.0-211.52.1.el10_2
    • Red Hat Enterprise Linux Real Time (v. 10) kernel-rt-6.12.0-211.52.1.el10_2, kernel-rt-64k-6.12.0-211.52.1.el10_2, kernel-rt-64k-core-6.12.0-211.52.1.el10_2 +21
    • Red Hat Enterprise Linux Real Time for NFV (v. 10) kernel-rt-6.12.0-211.52.1.el10_2, kernel-rt-core-6.12.0-211.52.1.el10_2, kernel-rt-debug-6.12.0-211.52.1.el10_2 +9

Vendor assessments

Red Hat

Red Hat rating: Important. Red Hat's page for this CVE →

ProductStatusPlan or fix
Red Hat Enterprise Linux 8AffectedNo fix yet
Red Hat Enterprise Linux AppStream (v. 10)Fixed RHSA-2026:64775
Red Hat Enterprise Linux AppStream (v. 9)Fixed RHSA-2026:64808
Red Hat Enterprise Linux BaseOS (v. 10)Fixed RHSA-2026:64775
Red Hat Enterprise Linux BaseOS (v. 9)Fixed RHSA-2026:64808
Red Hat Enterprise Linux CodeReady Linux Builder (v. 10)Fixed RHSA-2026:64775
Red Hat Enterprise Linux CodeReady Linux Builder (v. 9)Fixed RHSA-2026:64808
Red Hat Enterprise Linux Real Time (v. 10)Fixed RHSA-2026:64775
Red Hat Enterprise Linux Real Time (v. 9)Fixed RHSA-2026:64808
Red Hat Enterprise Linux Real Time for NFV (v. 10)Fixed RHSA-2026:64775
Red Hat Enterprise Linux Real Time for NFV (v. 9)Fixed RHSA-2026:64808
Not affected: 3 products
  • Red Hat Enterprise Linux 6
  • Red Hat Enterprise Linux 7
  • Red Hat Enterprise Linux 9

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-64287
  2. 2026-10-03 Alias added: GHSA-hfcp-qwvj-9247
  3. 2026-10-16 CISA SSVC decision points changed
  4. 2026-10-20 Weakness changed · CISA ADP
  5. 2026-10-29 Affected versions changed · Red Hat

References

Patch 5

  • TI-2025-26358 tls: fix handling of zero-length records on the rx_list KEVCVSS 3.1CRITICAL 9.8
  • TI-2026-38352 netfilter: bridge: make ebt_snat ARP rewrite writable KEVCVSS 3.1HIGH 8.8
  • TI-2013-05264 The (1) get_user and (2) put_user API functions in the Linux kernel before 3.5.5 on the… KEVCVSS 3.1HIGH 8.8
  • TI-2022-00125 Integer overflow in kernel KEVCVSS 3.1HIGH 8.4
  • TI-2013-01864 The perf_swevent_init function in kernel/events/core.c in the Linux kernel before 3.8.9… KEVCVSS 3.1HIGH 8.4
  • TI-2021-05514 Heap Out-Of-Bounds Write in Netfilter IP6T_SO_SET_REPLACE KEVCVSS 3.1HIGH 8.3
See all 15278 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences