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TI-2025-25690 Aliases CVE-2025-38351GHSA-x77v-68j6-p42v

KVM: x86/hyper-v: Skip non-canonical addresses during PV TLB flush

Priority LOW 24Published · Updated

Key facts

Attack vector
Local
Privileges required
Low
User interaction
None
Attack complexity
Low
Impact type
—
Confidentiality · integrity · availability
None · None · High
Fix status
Fixed

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

Summary

In the Linux kernel, the following vulnerability has been resolved: KVM: x86/hyper-v: Skip non-canonical addresses during PV TLB flush In KVM guests with Hyper-V hypercalls enabled, the hypercalls HVCALL_FLUSH_VIRTUAL_ADDRESS_LIST and HVCALL_FLUSH_VIRTUAL_ADDRESS_LIST_EX allow a guest to request invalidation of portions of a virtual TLB. For this, the hypercall parameter includes a list of GVAs that are supposed to be invalidated. However, when non-canonical GVAs are passed, there is currently no filtering in place and they are eventually passed to checked invocations of INVVPID on Intel / INVLPGA on AMD. While AMD's INVLPGA silently ignores non-canonical addresses (effectively a no-op), Intel's INVVPID explicitly signals VM-Fail and ultimately triggers the WARN_ONCE in invvpid_error(): invvpid failed: ext=0x0 vpid=1 gva=0xaaaaaaaaaaaaa000 WARNING: CPU: 6 PID: 326 at arch/x86/kvm/vmx/vmx.c:482 invvpid_error+0x91/0xa0 [kvm_intel] Modules linked in: kvm_intel kvm 9pnet_virtio irqbypass fuse CPU: 6 UID: 0 PID: 326 Comm: kvm-vm Not tainted 6.15.0 #14 PREEMPT(voluntary) RIP: 0010:invvpid_error+0x91/0xa0 [kvm_intel] Call Trace: vmx_flush_tlb_gva+0x320/0x490 [kvm_intel] kvm_hv_vcpu_flush_tlb+0x24f/0x4f0 [kvm] kvm_arch_vcpu_ioctl_run+0x3013/0x5810 [kvm] Hyper-V documents that invalid GVAs (those that are beyond a partition's GVA space) are to be ignored. While not completely clear whether this ruling also applies to non-canonical GVAs, it is likely fine to make that assumption, and manual testing on Azure confirms "real" Hyper-V interprets the specification in the same way. Skip non-canonical GVAs when processing the list of address to avoid tripping the INVVPID failure. Alternatively, KVM could filter out "bad" GVAs before inserting into the FIFO, but practically speaking the only downside of pushing validation to the final processing is that doing so is suboptimal for the guest, and no well-behaved guest will request TLB flushes for non-canonical addresses.

Why it matters now

EPSS 0.00192 8th percentileScored 2026-11-07
Fix Fixed Linux (Linux): 6.6.103, 6.12.41, 6.15.7 +1Red Hat: 3 advisories

SSVC decision points

Not available: CISA has not published SSVC decision points for this record.

Affected products

VendorProductAffected versionsFixed inStatusSource
LinuxLinux6.2 and later6.6.103, 6.12.41, 6.15.7, 6.16Patch availableCNA
  • Linux VendorLinux Affected 6.2 and later Fixed in 6.6.103, 6.12.41, 6.15.7, 6.16 Patch available CNA

CPE configurations NVD · 6

CPEVersionsRoleVendor
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*6.2 to before 6.6.103; 6.7 to before 6.12.41; 6.13 to before 6.15.7VulnerableLinux
cpe:2.3:o:linux:linux_kernel:6.16:rc1:*:*:*:*:*:*6.16 rc1VulnerableLinux
cpe:2.3:o:linux:linux_kernel:6.16:rc2:*:*:*:*:*:*6.16 rc2VulnerableLinux
cpe:2.3:o:linux:linux_kernel:6.16:rc3:*:*:*:*:*:*6.16 rc3VulnerableLinux
cpe:2.3:o:linux:linux_kernel:6.16:rc4:*:*:*:*:*:*6.16 rc4VulnerableLinux
cpe:2.3:o:linux:linux_kernel:6.16:rc5:*:*:*:*:*:*6.16 rc5VulnerableLinux
  • cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* Versions 6.2 to before 6.6.103; 6.7 to before 6.12.41; 6.13 to before 6.15.7 Vulnerable ·Linux
  • cpe:2.3:o:linux:linux_kernel:6.16:rc1:*:*:*:*:*:* Versions 6.16 rc1 Vulnerable ·Linux
  • cpe:2.3:o:linux:linux_kernel:6.16:rc2:*:*:*:*:*:* Versions 6.16 rc2 Vulnerable ·Linux
  • cpe:2.3:o:linux:linux_kernel:6.16:rc3:*:*:*:*:*:* Versions 6.16 rc3 Vulnerable ·Linux
  • cpe:2.3:o:linux:linux_kernel:6.16:rc4:*:*:*:*:*:* Versions 6.16 rc4 Vulnerable ·Linux
  • cpe:2.3:o:linux:linux_kernel:6.16:rc5:*:*:*:*:*:* Versions 6.16 rc5 Vulnerable ·Linux

Remediation

  • Fix · CNA Linux (Linux) Fixed in 6.6.103, 6.12.41, 6.15.7, 6.16

Red Hat 3 advisories

  • RHSA-2025:21469 Released 2025-11-17 · Red Hat rating Moderate
    kernel security update
    • Red Hat Enterprise Linux AppStream (v. 9) kernel-64k-debug-devel-5.14.0-611.8.1.el9_7, kernel-64k-debug-devel-matched-5.14.0-611.8.1.el9_7, kernel-64k-devel-5.14.0-611.8.1.el9_7 +12
    • Red Hat Enterprise Linux BaseOS (v. 9) kernel-5.14.0-611.8.1.el9_7, kernel-64k-5.14.0-611.8.1.el9_7, kernel-64k-core-5.14.0-611.8.1.el9_7 +28
    • Red Hat Enterprise Linux CodeReady Linux Builder (v. 9) kernel-tools-libs-devel-5.14.0-611.8.1.el9_7, libperf-5.14.0-611.8.1.el9_7
    • Red Hat Enterprise Linux Real Time (v. 9) kernel-rt-5.14.0-611.8.1.el9_7, kernel-rt-64k-5.14.0-611.8.1.el9_7, kernel-rt-64k-core-5.14.0-611.8.1.el9_7 +21
    • Red Hat Enterprise Linux Real Time for NFV (v. 9) kernel-rt-5.14.0-611.8.1.el9_7, kernel-rt-core-5.14.0-611.8.1.el9_7, kernel-rt-debug-5.14.0-611.8.1.el9_7 +9
  • RHSA-2025:18318 Released 2025-10-20 · Red Hat rating Moderate
    kernel security update
    • Red Hat Enterprise Linux AppStream (v. 10) kernel-64k-debug-devel-6.12.0-55.40.1.el10_0, kernel-64k-debug-devel-matched-6.12.0-55.40.1.el10_0, kernel-64k-devel-6.12.0-55.40.1.el10_0 +12
    • Red Hat Enterprise Linux BaseOS (v. 10) kernel-6.12.0-55.40.1.el10_0, kernel-64k-6.12.0-55.40.1.el10_0, kernel-64k-core-6.12.0-55.40.1.el10_0 +28
    • Red Hat Enterprise Linux CodeReady Linux Builder (v. 10) kernel-tools-libs-devel-6.12.0-55.40.1.el10_0, libperf-6.12.0-55.40.1.el10_0
    • Red Hat Enterprise Linux Real Time (v. 10) kernel-rt-6.12.0-55.40.1.el10_0, kernel-rt-64k-6.12.0-55.40.1.el10_0, kernel-rt-64k-core-6.12.0-55.40.1.el10_0 +21
    • Red Hat Enterprise Linux Real Time for NFV (v. 10) kernel-rt-6.12.0-55.40.1.el10_0, kernel-rt-core-6.12.0-55.40.1.el10_0, kernel-rt-debug-6.12.0-55.40.1.el10_0 +11
  • RHSA-2025:17377 Released 2025-10-06 · Red Hat rating Moderate
    kernel security update
    • Red Hat Enterprise Linux AppStream (v. 9) kernel-64k-debug-devel-5.14.0-570.51.1.el9_6, kernel-64k-debug-devel-matched-5.14.0-570.51.1.el9_6, kernel-64k-devel-5.14.0-570.51.1.el9_6 +12
    • Red Hat Enterprise Linux BaseOS (v. 9) kernel-5.14.0-570.51.1.el9_6, kernel-64k-5.14.0-570.51.1.el9_6, kernel-64k-core-5.14.0-570.51.1.el9_6 +28
    • Red Hat Enterprise Linux CodeReady Linux Builder (v. 9) kernel-tools-libs-devel-5.14.0-570.51.1.el9_6, libperf-5.14.0-570.51.1.el9_6
    • Red Hat Enterprise Linux Real Time (v. 9) kernel-rt-5.14.0-570.51.1.el9_6, kernel-rt-64k-5.14.0-570.51.1.el9_6, kernel-rt-64k-core-5.14.0-570.51.1.el9_6 +21
    • Red Hat Enterprise Linux Real Time for NFV (v. 9) kernel-rt-5.14.0-570.51.1.el9_6, kernel-rt-core-5.14.0-570.51.1.el9_6, kernel-rt-debug-5.14.0-570.51.1.el9_6 +11

Vendor assessments

Red Hat

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

ProductStatusPlan or fix
Red Hat Enterprise Linux AppStream (v. 10)Fixed RHSA-2025:18318
Red Hat Enterprise Linux AppStream (v. 9)Fixed RHSA-2025:17377, RHSA-2025:21469
Red Hat Enterprise Linux BaseOS (v. 10)Fixed RHSA-2025:18318
Red Hat Enterprise Linux BaseOS (v. 9)Fixed RHSA-2025:17377, RHSA-2025:21469
Red Hat Enterprise Linux CodeReady Linux Builder (v. 10)Fixed RHSA-2025:18318
Red Hat Enterprise Linux CodeReady Linux Builder (v. 9)Fixed RHSA-2025:17377, RHSA-2025:21469
Red Hat Enterprise Linux Real Time (v. 10)Fixed RHSA-2025:18318
Red Hat Enterprise Linux Real Time (v. 9)Fixed RHSA-2025:17377, RHSA-2025:21469
Red Hat Enterprise Linux Real Time for NFV (v. 10)Fixed RHSA-2025:18318
Red Hat Enterprise Linux Real Time for NFV (v. 9)Fixed RHSA-2025:17377, RHSA-2025:21469
Not affected: 3 products
  • Red Hat Enterprise Linux 6
  • Red Hat Enterprise Linux 7
  • Red Hat Enterprise Linux 8

Timeline

  1. 2026-10-02 Threatist record created from CVE-2025-38351
  2. 2026-10-03 Alias added: GHSA-x77v-68j6-p42v
  3. 2026-10-29 Affected versions changed · Red Hat

References

Patch 4

  • 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