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Linux Kernel CVE-2026-80726

| EUVDEUVD-2026-70330 CRITICAL
2026-09-03 Linux GHSA-j8gw-c9fh-xgv4
Linux Red Hat Suse
9.3
CVSS 3.1 · Vendor: Linux
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Severity by source

Vendor (Linux) PRIMARY
9.3 CRITICAL
AV:L/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
vuln.today AI
7.8 HIGH

Local /dev/kvm access needed (PR:L), race-like invalid-root window (AC:H); guest-to-host UAF gives scope change and full host CIA impact.

3.1 AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H
4.0 AV:L/AC:H/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H
SUSE
CRITICAL
qualitative
Red Hat
8.8 HIGH
qualitative

Primary rating from Vendor (Linux).

CVSS VectorVendor: Linux

Attack Vector
Local
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Changed
Confidentiality
High
Integrity
High
Availability
High

Lifecycle Timeline

6
Metadata Corrected
Sep 04, 2026 - 05:40 vuln.today
tag: Information Disclosure removed
Analysis Generated
Sep 04, 2026 - 05:23 vuln.today
CVSS changed
Sep 04, 2026 - 05:22 NVD
9.3 (CRITICAL)
Patch available
Sep 03, 2026 - 10:16 EUVD
CVE Published
Sep 03, 2026 - 08:21 cve.org
UNKNOWN (no severity yet)
CVE Published
Sep 03, 2026 - 08:21 cve.org
CRITICAL 9.3

DescriptionCVE.org

In the Linux kernel, the following vulnerability has been resolved:

KVM: x86/mmu: WARN and clear role.invalid when creating a child shadow page

Explicitly clear role.invalid when deriving a child shadow page's role from its parent to harden against bugs elsewhere in KVM, as violating KVM's invariant that invalid pages are NOT on the list of active MMU pages leads to use-after-free due to __kvm_mmu_prepare_zap_page() using list_add() instead of list_move() when processing an invalid shadow page, i.e. makes a bad situation far worse.

Yell loudly if the parent is invalid, as it means KVM has missed a validity check, i.e. KVM is attempting to map memory using an invalid/obsolete root, but continue on as the child is otherwise still a valid shadow page.

============== BUG: KASAN: slab-use-after-free in __kvm_mmu_get_shadow_page+0x1817/0x1860 [kvm] Write of size 8 at addr ff11000153dd1368 by task repro/853

CPU: 1 UID: 1000 PID: 853 Comm: repro Not tainted 7.2.0-rc2-3aec122bdcaf-next-vm #5 PREEMPT Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 0.0.0 02/06/2015 Call Trace: <TASK> dump_stack_lvl+0x4b/0x70 print_report+0x153/0x49c kasan_report+0xbc/0xf0 __kvm_mmu_get_shadow_page+0x1817/0x1860 [kvm] mmu_alloc_root+0x141/0x320 [kvm] kvm_mmu_load+0x612/0x20f0 [kvm] kvm_arch_vcpu_ioctl_run+0x3dd5/0x6150 [kvm] kvm_vcpu_ioctl+0x5e4/0x10d0 [kvm] __x64_sys_ioctl+0x131/0x1b0 do_syscall_64+0x67/0x5f0 entry_SYSCALL_64_after_hwframe+0x4b/0x53 </TASK>

Allocated by task 853: kasan_save_stack+0x20/0x40 kasan_save_track+0x14/0x30 __kasan_slab_alloc+0x5f/0x70 kmem_cache_alloc_noprof+0xfe/0x2e0 __kvm_mmu_topup_memory_cache+0x135/0x530 [kvm] paging64_page_fault+0x318/0x1e30 [kvm] kvm_mmu_do_page_fault+0x21d/0x630 [kvm] kvm_mmu_page_fault+0x18c/0x17b0 [kvm] kvm_arch_vcpu_ioctl_run+0x1f35/0x6150 [kvm] kvm_vcpu_ioctl+0x5e4/0x10d0 [kvm] __x64_sys_ioctl+0x131/0x1b0 do_syscall_64+0x67/0x5f0 entry_SYSCALL_64_after_hwframe+0x4b/0x53

Freed by task 853: kasan_save_stack+0x20/0x40 kasan_save_track+0x14/0x30 kasan_save_free_info+0x3b/0x60 __kasan_slab_free+0x43/0x70 kmem_cache_free+0xe2/0x400 kvm_mmu_commit_zap_page.part.0+0x1e2/0x310 [kvm] kvm_mmu_free_roots+0x283/0x560 [kvm] kvm_arch_vcpu_ioctl_run+0x33c8/0x6150 [kvm] kvm_vcpu_ioctl+0x5e4/0x10d0 [kvm] __x64_sys_ioctl+0x131/0x1b0 do_syscall_64+0x67/0x5f0 entry_SYSCALL_64_after_hwframe+0x4b/0x53

AnalysisAI

Local privilege escalation / host memory corruption in the Linux kernel's KVM x86 shadow-MMU allows a malicious or buggy guest to trigger a slab use-after-free on the KVM host. When KVM derives a child shadow page's role from an invalid/obsolete parent root, it fails to clear role.invalid, violating the invariant that invalid pages stay off the active MMU list; __kvm_mmu_prepare_zap_page() then uses list_add() instead of list_move(), corrupting the list and freeing a shadow page that is still referenced, producing a KASAN slab-use-after-free in __kvm_mmu_get_shadow_page. …

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Vulnerability AssessmentAI

Exploitation Requires local access to the KVM host with the ability to create and run a virtual machine (issuing KVM_RUN/vcpu ioctls, i.e. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The signals are mixed and point to a lower real-world priority than the 9.3 base score suggests. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario Full exploit scenario with step-by-step reproduction available after sign-in.
Remediation Vendor-released patch: update to a fixed Linux kernel - 7.2, 7.1.9, 6.18.45, 6.12.104, 6.6.152, or 6.1.183 (or later) matching your stable branch, then reboot onto the patched kernel. … Detailed patch versions, workarounds, and compensating controls in full report.
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Within 24 hours, identify all systems running Linux KVM hypervisors and audit their current kernel versions against the vulnerable release. …

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Vendor StatusVendor

SUSE

Severity: Critical
Product Status
SUSE Linux Enterprise Desktop 15 SP7 Affected
SUSE Linux Enterprise Desktop 15 SP7 Affected
SUSE Linux Enterprise High Availability Extension 15 SP7 Affected
SUSE Linux Enterprise High Availability Extension 15 SP7 Affected
SUSE Linux Enterprise High Availability Extension 16.0 Affected

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CVE-2026-80726 vulnerability details – vuln.today
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