KVM: s390: Fix old_data leak in guest debug error path
Key facts
- Attack vector
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- Privileges required
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- User interaction
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- Attack complexity
- —
- Impact type
- —
- Confidentiality · integrity · availability
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- Fix status
- Partial Red Hat: 5 without a fix
No CVSS vector from any source. Fix status from CNA and Red Hat.
Summary
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.
Why it matters now
SSVC decision points
Not available: CISA has not published SSVC decision points for this record.
Affected products
Remediation
- Fix · CNA Linux (Linux) Fixed in 5.10.270, 5.15.221, 6.1.188, 6.6.157, 6.12.110, 6.18.51, 7.2.5, 7.3
Vendor assessments
Red Hat
Red Hat rating: Low. Red Hat's page for this CVE →
| Product | Status | Plan or fix |
|---|---|---|
| Red Hat Enterprise Linux 10 | Affected | No fix yet: Fix deferred |
| Red Hat Enterprise Linux 8 | Affected | No fix yet: Fix deferred |
| Red Hat Enterprise Linux 9 | Affected | No fix yet: Fix deferred |
| Red Hat OpenShift Container Platform 4 | Affected | No fix yet: Fix deferred |
| Red Hat OpenShift Container Platform 5 | Affected | No fix yet: Fix deferred |
Not affected: 2 products
- Red Hat Enterprise Linux 6
- Red Hat Enterprise Linux 7
Timeline
- 2026-10-02 Threatist record created from CVE-2026-89924
- 2026-10-03 Alias added: GHSA-xq38-q7w3-m3v4
- 2026-10-06 Affected versions changed · Red Hat
- 2026-10-06 CVSS score added · Red Hat
- 2026-10-19 Fix available: Linux/[email protected] · CNA
- 2026-11-07 Affected versions changed · Red Hat
References
Other 8
- https://git.kernel.org/stable/c/124c81ee610e1fbdd93d4399f88d9e28ba97a941
- https://git.kernel.org/stable/c/e5ae7816e5ad145618f7fd568a0e8a94dd9f81f4
- https://git.kernel.org/stable/c/c85d402553987777cc4742751437ea5dcbf98a7b
- https://git.kernel.org/stable/c/5fbf319137735252eefa507193c9a619af5b7457
- https://git.kernel.org/stable/c/4048d0a252163084794be3e37995b872c5178913
- https://git.kernel.org/stable/c/f55e4d415d95342d5753e528e05a1e8623992c3f
- https://git.kernel.org/stable/c/46cb8a273e2f853f89a78b59dbdff8787b6e1c86
- https://git.kernel.org/stable/c/aa9c8e8baf1e765fa65b93212522c636f25d846f
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Sources
- CVE-2026-89924 · CVE Program
- CVE-2026-89924 · NVD
- FIRST EPSS
- GHSA-xq38-q7w3-m3v4 · GitHub Advisory Database · CC BY 4.0
- CVE-2026-89924 · Red Hat security data · CC BY 4.0
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