CVE-2026-89924

Description

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.

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EPSS — Exploit Prediction

0.0021

Probability of exploitation

0.11%

Percentile rank

EPSS estimates the probability that this vulnerability will be exploited in the wild within the next 30 days. A higher score means more likely to be exploited.

References

Other References

https://git.kernel.org/stable/c/124c81ee610e1fbdd93d4399f88d9e28ba97a941 https://git.kernel.org/stable/c/4048d0a252163084794be3e37995b872c5178913 https://git.kernel.org/stable/c/46cb8a273e2f853f89a78b59dbdff8787b6e1c86 https://git.kernel.org/stable/c/5fbf319137735252eefa507193c9a619af5b7457 https://git.kernel.org/stable/c/aa9c8e8baf1e765fa65b93212522c636f25d846f https://git.kernel.org/stable/c/c85d402553987777cc4742751437ea5dcbf98a7b https://git.kernel.org/stable/c/e5ae7816e5ad145618f7fd568a0e8a94dd9f81f4 https://git.kernel.org/stable/c/f55e4d415d95342d5753e528e05a1e8623992c3f

Frequently Asked Questions

What is CVE-2026-89924? +

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.

How do I check if I'm vulnerable to CVE-2026-89924? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.