Linux Kernel up to 7.2.4 nVMX nested_vmx_transition_tlb_flush initialization

CVSS Meta Temp Score
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CTI Interest Score
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9.5$0-$5k0.45

Summaryinfo

A vulnerability described as very critical has been identified in Linux Kernel up to 7.2.4. The affected element is the function nested_vmx_transition_tlb_flush of the component nVMX. The manipulation results in initialization. This vulnerability is cataloged as CVE-2026-89932. The attack may be launched remotely. There is no exploit available. Upgrading the affected component is recommended.

Detailsinfo

A vulnerability classified as very critical has been found in Linux Kernel up to 7.2.4. Affected is the function nested_vmx_transition_tlb_flush of the component nVMX. The manipulation with an unknown input leads to a initialization vulnerability. CWE is classifying the issue as CWE-665. The product does not initialize or incorrectly initializes a resource, which might leave the resource in an unexpected state when it is accessed or used. This is going to have an impact on confidentiality, integrity, and availability. CVE summarizes:

In the Linux kernel, the following vulnerability has been resolved: KVM: nVMX: Always flush vpid02 on first use Make sure vpid02 is always flushed on first use by setting last_vpid=0 when allocating vpid02. nested_vmx_transition_tlb_flush() will always detect a VPID change on first VM-Enter after VMXON, because VPID=0 in vmcs12 is not allowed if L1 enables VPID. This avoids using stale TLB entries from a previous lifetime of the VPID, that might have been associated with a different vCPU (or a completely different VM). Note that last_vpid is already being initialized as 0 when the vCPU is created, but it is not reset when vpid02 is freed on VMXOFF. Hence, the problem can only occur if L1 does VMXOFF -> VMXON, runs an L2, and KVM happens to reuse a VPID that has TLB entries on the physical CPU.

The advisory is available at git.kernel.org. This vulnerability is traded as CVE-2026-89932 since 09/11/2026. The exploitability is told to be easy. It is possible to launch the attack remotely. Technical details are known, but there is no available exploit. The structure of the vulnerability defines a possible price range of USD $0-$5k at the moment (estimation calculated on 09/16/2026).

Upgrading to version 5.15.221, 6.1.188, 6.6.157, 6.12.110, 6.18.51, 7.2.5 or 7.3-rc1 eliminates this vulnerability. Applying the patch 26de0d2d9a8d14c03e5ebb25fd68b5bfcd5ac366/8bc609999ec223089fec8d74c7de27d689606b36/62604376c313178811375f40a282fc2a46cd2311/8b98d662ab24f34710a56e03bc9169e4a5508606/22dfcc22c95e91295119a1c3b469816ce44c4804/121991d150735f3c0f7401678ce4d35c5b4ac898/f0772389413dce9657c7d6950abf3edbbd511356 is able to eliminate this problem. The best possible mitigation is suggested to be upgrading to the latest version.

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Productinfo

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Version

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CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 9.9
VulDB Meta Temp Score: 9.5

VulDB Base Score: 9.9
VulDB Temp Score: 9.5
VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv2info

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Initialization
CWE: CWE-665
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Status: Not defined
Price Prediction: 🔍
Current Price Estimation: 🔒

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Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: Kernel 5.15.221/6.1.188/6.6.157/6.12.110/6.18.51/7.2.5/7.3-rc1
Patch: 26de0d2d9a8d14c03e5ebb25fd68b5bfcd5ac366/8bc609999ec223089fec8d74c7de27d689606b36/62604376c313178811375f40a282fc2a46cd2311/8b98d662ab24f34710a56e03bc9169e4a5508606/22dfcc22c95e91295119a1c3b469816ce44c4804/121991d150735f3c0f7401678ce4d35c5b4ac898/f0772389413dce9657c7d6950abf3edbbd511356

Timelineinfo

09/11/2026 CVE reserved
09/16/2026 +5 days Advisory disclosed
09/16/2026 +0 days VulDB entry created
09/16/2026 +0 days VulDB entry last update

Sourcesinfo

Vendor: kernel.org

Advisory: git.kernel.org
Status: Confirmed

CVE: CVE-2026-89932 (🔒)
GCVE (CVE): GCVE-0-2026-89932
GCVE (VulDB): GCVE-100-405774

Entryinfo

Created: 09/16/2026 14:48
Changes: 09/16/2026 14:48 (59)
Complete: 🔍
Cache ID: 216::103

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