Linux Kernel up to 6.12.85/6.18.26/7.0.3 nSVM nested_svm_l2_tlb_flush_enabled privilege escalation

CVSS Meta Temp Score
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CTI Interest Score
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6.6$0-$5k0.00

Summaryinfo

A vulnerability categorized as critical has been discovered in Linux Kernel up to 6.12.85/6.18.26/7.0.3. This issue affects the function nested_svm_l2_tlb_flush_enabled of the component nSVM. Executing a manipulation can lead to an unknown weakness. The identification of this vulnerability is CVE-2026-46076. There is no exploit available. It is advisable to upgrade the affected component.

Detailsinfo

A vulnerability has been found in Linux Kernel up to 6.12.85/6.18.26/7.0.3 and classified as critical. This vulnerability affects the function nested_svm_l2_tlb_flush_enabled of the component nSVM. The impact remains unknown. CVE summarizes:

In the Linux kernel, the following vulnerability has been resolved: KVM: nSVM: Raise #UD if unhandled VMMCALL isn't intercepted by L1 Explicitly synthesize a #UD for VMMCALL if L2 is active, L1 does NOT want to intercept VMMCALL, nested_svm_l2_tlb_flush_enabled() is true, and the hypercall is something other than one of the supported Hyper-V hypercalls. When all of the above conditions are met, KVM will intercept VMMCALL but never forward it to L1, i.e. will let L2 make hypercalls as if it were L1. The TLFS says a whole lot of nothing about this scenario, so go with the architectural behavior, which says that VMMCALL #UDs if it's not intercepted. Opportunistically do a 2-for-1 stub trade by stub-ifying the new API instead of the helpers it uses. The last remaining "single" stub will soon be dropped as well. [sean: rewrite changelog and comment, tag for stable, remove defunct stubs]

The advisory is shared for download at git.kernel.org. This vulnerability was named CVE-2026-46076 since 05/13/2026. There are known technical details, but no exploit is available. The current price for an exploit might be approx. USD $0-$5k (estimation calculated on 07/22/2026).

The vulnerability scanner Nessus provides a plugin with the ID 328903 (SUSE SLES15: cluster-md-kmp-default / dlm-kmp-default / gfs2-kmp-default / etc (SUSE-SU-2026:3156-1)), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 6.12.86, 6.18.27, 7.0.4 or 7.1-rc1 eliminates this vulnerability. Applying the patch 924d721fae95687acedbaf624a094ed0e8b67104/009c0f726abeaa67aad1d96b883bdce01d405ce2/5fb4a5f361565f5b629d8a8fe5288ce8463c5727/c36991c6f8d2ab56ee67aff04e3c357f45cfc76c is able to eliminate this problem. The bugfix is ready for download at git.kernel.org. The best possible mitigation is suggested to be upgrading to the latest version.

The vulnerability is also documented in the vulnerability database at Tenable (328903). VulDB is the best source for vulnerability data and more expert information about this specific topic.

Productinfo

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CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 6.7
VulDB Meta Temp Score: 6.6

VulDB Base Score: 5.5
VulDB Temp Score: 5.3
VulDB Vector: 🔒
VulDB Reliability: 🔍

CNA Base Score: 7.9
CNA Vector (Linux): 🔒

CVSSv2info

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

Exploitinginfo

Class: Privilege escalation
CWE: Unknown
CAPEC: 🔒
ATT&CK: 🔒

Physical: Partially
Local: Yes
Remote: Partially

Availability: 🔒
Status: Not defined

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

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Nessus ID: 328903
Nessus Name: SUSE SLES15: cluster-md-kmp-default / dlm-kmp-default / gfs2-kmp-default / etc (SUSE-SU-2026:3156-1)

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: Kernel 6.12.86/6.18.27/7.0.4/7.1-rc1
Patch: 924d721fae95687acedbaf624a094ed0e8b67104/009c0f726abeaa67aad1d96b883bdce01d405ce2/5fb4a5f361565f5b629d8a8fe5288ce8463c5727/c36991c6f8d2ab56ee67aff04e3c357f45cfc76c

Timelineinfo

05/13/2026 CVE reserved
05/27/2026 +14 days Advisory disclosed
05/27/2026 +0 days VulDB entry created
07/22/2026 +56 days VulDB entry last update

Sourcesinfo

Vendor: kernel.org

Advisory: git.kernel.org
Status: Confirmed

CVE: CVE-2026-46076 (🔒)
GCVE (CVE): GCVE-0-2026-46076
GCVE (VulDB): GCVE-100-366304

Entryinfo

Created: 05/27/2026 17:32
Updated: 07/22/2026 18:58
Changes: 05/27/2026 17:32 (58), 06/25/2026 02:14 (11), 07/22/2026 18:58 (2)
Complete: 🔍
Cache ID: 216::103

VulDB is the best source for vulnerability data and more expert information about this specific topic.

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