Linux Kernel up to 7.2.4 s390 kvm_s390_import_bp_data memory leak

CVSS Meta Temp Score
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CTI Interest Score
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4.5$0-$5k0.00-

Summaryinfo

A vulnerability labeled as problematic has been found in Linux Kernel up to 7.2.4. Affected by this issue is the function kvm_s390_import_bp_data of the component s390. Such manipulation leads to memory leak. This vulnerability is listed as CVE-2026-89924. The attack may be performed from remote. There is no available exploit. The affected component should be upgraded.

Detailsinfo

A vulnerability, which was classified as problematic, has been found in Linux Kernel up to 7.2.4. Affected by this issue is the function kvm_s390_import_bp_data of the component s390. The manipulation with an unknown input leads to a memory leak vulnerability. Using CWE to declare the problem leads to CWE-401. The product does not sufficiently track and release allocated memory after it has been used, which slowly consumes remaining memory. Impacted is confidentiality, integrity, and availability. CVE summarizes:

In the Linux kernel, the following vulnerability has been resolved: KVM: s390: Fix old_data leak in guest debug error path __import_wp_info() allocates a per-watchpoint old_data buffer to back up the original guest memory contents. If a later watchpoint of the same KVM_SET_GUEST_DEBUG request fails to import, kvm_s390_import_bp_data() jumps to the error label, which frees the wp_info array but not the old_data buffers of the entries that were imported successfully. Up to MAX_BP_COUNT - 1 buffers of up to MAX_WP_SIZE bytes are leaked per failed request, and the request can be repeated. Create error handling for cleaning up all created old_data memory areas.

The advisory is available at git.kernel.org. This vulnerability is handled as CVE-2026-89924 since 09/11/2026. The exploitation is known to be easy. The attack may be launched remotely. Additional levels of successful authentication are necessary for exploitation. Technical details are known, but there is no available exploit. This vulnerability is assigned to T1499 by the MITRE ATT&CK project.

Upgrading to version 5.10.270, 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 124c81ee610e1fbdd93d4399f88d9e28ba97a941/e5ae7816e5ad145618f7fd568a0e8a94dd9f81f4/c85d402553987777cc4742751437ea5dcbf98a7b/5fbf319137735252eefa507193c9a619af5b7457/4048d0a252163084794be3e37995b872c5178913/f55e4d415d95342d5753e528e05a1e8623992c3f/46cb8a273e2f853f89a78b59dbdff8787b6e1c86/aa9c8e8baf1e765fa65b93212522c636f25d846f 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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CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 4.7
VulDB Meta Temp Score: 4.5

VulDB Base Score: 4.7
VulDB Temp Score: 4.5
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: Memory leak
CWE: CWE-401 / CWE-404
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 5.10.270/5.15.221/6.1.188/6.6.157/6.12.110/6.18.51/7.2.5/7.3-rc1
Patch: 124c81ee610e1fbdd93d4399f88d9e28ba97a941/e5ae7816e5ad145618f7fd568a0e8a94dd9f81f4/c85d402553987777cc4742751437ea5dcbf98a7b/5fbf319137735252eefa507193c9a619af5b7457/4048d0a252163084794be3e37995b872c5178913/f55e4d415d95342d5753e528e05a1e8623992c3f/46cb8a273e2f853f89a78b59dbdff8787b6e1c86/aa9c8e8baf1e765fa65b93212522c636f25d846f

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-2026-89924 (🔒)
GCVE (CVE): GCVE-0-2026-89924
GCVE (VulDB): GCVE-100-405758

Entryinfo

Created: 09/16/2026 14:39
Changes: 09/16/2026 14:39 (59)
Complete: 🔍
Cache ID: 216::103

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