Linux Kernel up to 7.2.4 KVM s390 Hardware Breakpoint __import_wp_info len memory corruption

CVSS Meta Temp Score
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CTI Interest Score
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6.2$0-$5k0.45

Summaryinfo

A vulnerability was found in Linux Kernel up to 7.2.4 and classified as critical. This impacts the function __import_wp_info of the component KVM s390 Hardware Breakpoint. Executing a manipulation of the argument len can lead to memory corruption. This vulnerability is handled as CVE-2026-89926. The attack can be executed remotely. There is not any exploit available. It is suggested to upgrade the affected component.

Detailsinfo

A vulnerability classified as critical was found in Linux Kernel up to 7.2.4. This vulnerability affects the function __import_wp_info of the component KVM s390 Hardware Breakpoint. The manipulation of the argument len with an unknown input leads to a memory corruption vulnerability. The CWE definition for the vulnerability is CWE-119. The product performs operations on a memory buffer, but it can read from or write to a memory location that is outside of the intended boundary of the buffer. As an impact it is known to affect availability. CVE summarizes:

In the Linux kernel, the following vulnerability has been resolved: KVM: s390: Fix length check __import_wp_info() struct kvm_hw_breakpoint::len is a __u64 that is fully controlled by user space. This is then assigned to wp_info->len, which is an int. The bounds check is done on the truncated value while the allocation uses the untruncated one: wp_info->len = bp_data->len; [...] if (wp_info->len < 0 || wp_info->len > MAX_WP_SIZE) return -EINVAL; wp_info->old_data = kmalloc(bp_data->len, GFP_KERNEL_ACCOUNT); Use the validated value for the allocation as intended. Without this fix userspace can trigger >4GB allocations which will fail and result in a WARN due to MAX_PAGE_ORDER.

The advisory is available at git.kernel.org. This vulnerability was named CVE-2026-89926 since 09/11/2026. The exploitation appears to be easy. The attack can be initiated 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 aef540194effd768bed0bd2e6a74fe135a3d7c3a/71153d3262517e1c02c3a66aa5094f279b2d1454/fec89d327d9b2b669b5bbdac209386c6317c3722/b94ab9caa5d72c78226121cccff5e33f946da900/beb9c55af609c4c7308259d7191688c75a4e3d4a/3fe801db90bdeefb0bbdda42d832846b53f64f8a/4c07680a467e2f7697245bcd11691bffb2a6f0ed 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: 6.5
VulDB Meta Temp Score: 6.2

VulDB Base Score: 6.5
VulDB Temp Score: 6.2
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: Memory corruption
CWE: CWE-119
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: aef540194effd768bed0bd2e6a74fe135a3d7c3a/71153d3262517e1c02c3a66aa5094f279b2d1454/fec89d327d9b2b669b5bbdac209386c6317c3722/b94ab9caa5d72c78226121cccff5e33f946da900/beb9c55af609c4c7308259d7191688c75a4e3d4a/3fe801db90bdeefb0bbdda42d832846b53f64f8a/4c07680a467e2f7697245bcd11691bffb2a6f0ed

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-2026-89926 (🔒)
GCVE (CVE): GCVE-0-2026-89926
GCVE (VulDB): GCVE-100-405766

Entryinfo

Created: 09/16/2026 14:44
Changes: 09/16/2026 14:44 (60)
Complete: 🔍
Cache ID: 216::103

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