Linux Kernel up to 7.1.7 KVM input validation

CVSS Meta Temp Score
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CTI Interest Score
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8.7$0-$5k0.41

Summaryinfo

A vulnerability marked as very critical has been reported in Linux Kernel up to 6.1.182/6.6.150/6.12.102/6.18.43/7.1.7. This issue affects some unknown processing of the component KVM. The manipulation leads to input validation. This vulnerability is referenced as CVE-2026-80891. Remote exploitation of the attack is possible. No exploit is available.

Detailsinfo

A vulnerability was found in Linux Kernel up to 6.1.182/6.6.150/6.12.102/6.18.43/7.1.7. It has been rated as very critical. This issue affects an unknown code of the component KVM. The manipulation with an unknown input leads to a input validation vulnerability. Using CWE to declare the problem leads to CWE-20. The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly. Impacted is confidentiality, integrity, and availability. The summary by CVE is:

In the Linux kernel, the following vulnerability has been resolved: KVM: s390: pci: Validate AIBV and AISB before pinning guest pages The AIBV holds one bit per MSI-X vector for a given function. The size of the bit vector is derived from the NOI and the AIBVO. If the size of the AIBV exceeds a single page boundary, then reject the request as we cannot safely pin the guest AIBV. Similarly reject the request if the AISB address is not 8-byte aligned as the architecture requires doubleword alignment for the summary bit address. Since the AISBO can address up to 64 bits, the size of the AISB can only be 8 bytes for the function. This also ensures the AISB doesn't exceed a single page boundary.

It is possible to read the advisory at git.kernel.org. The identification of this vulnerability is CVE-2026-80891 since 08/26/2026. The exploitation is known to be easy. The attack may be initiated remotely. The exploitation requires an enhanced level of successful authentication. The technical details are unknown and an exploit is not publicly available. The pricing for an exploit might be around USD $0-$5k at the moment (estimation calculated on 09/04/2026).

Upgrading to version 6.1.183, 6.6.151, 6.12.103, 6.18.44 or 7.1.8 eliminates this vulnerability. Applying the patch 3a1c64220ede4ac9ef9a3e76f008ff60a34f4c48/f00ef8efd41440129ccd88f4a1ebebf8d61d297f/15df7700dd99f8a37f5c6ed2dcf1e33009cdba47/b878ba7e28144c9a857bc847d31f3c45413450ac/fbfe683f8b1ae7e40b56bdd6daf5bd671bc3a528/868d32ac72cba21c5c6d8a66a814b7c25a3a5c01 is able to eliminate this problem.

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Productinfo

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CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 9.1
VulDB Meta Temp Score: 8.7

VulDB Base Score: 9.1
VulDB Temp Score: 8.7
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: Input validation
CWE: CWE-20
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 6.1.183/6.6.151/6.12.103/6.18.44/7.1.8
Patch: 3a1c64220ede4ac9ef9a3e76f008ff60a34f4c48/f00ef8efd41440129ccd88f4a1ebebf8d61d297f/15df7700dd99f8a37f5c6ed2dcf1e33009cdba47/b878ba7e28144c9a857bc847d31f3c45413450ac/fbfe683f8b1ae7e40b56bdd6daf5bd671bc3a528/868d32ac72cba21c5c6d8a66a814b7c25a3a5c01

Timelineinfo

08/26/2026 CVE reserved
09/04/2026 +9 days Advisory disclosed
09/04/2026 +0 days VulDB entry created
09/04/2026 +0 days VulDB entry last update

Sourcesinfo

Vendor: kernel.org

Advisory: git.kernel.org
Status: Confirmed

CVE: CVE-2026-80891 (🔒)
GCVE (CVE): GCVE-0-2026-80891
GCVE (VulDB): GCVE-100-399095

Entryinfo

Created: 09/04/2026 19:35
Changes: 09/04/2026 19:35 (58)
Complete: 🔍
Cache ID: 216::103

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