CVE-2026-89926

Description

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.

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EPSS — Exploit Prediction

0.0022

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/3fe801db90bdeefb0bbdda42d832846b53f64f8a https://git.kernel.org/stable/c/4c07680a467e2f7697245bcd11691bffb2a6f0ed https://git.kernel.org/stable/c/71153d3262517e1c02c3a66aa5094f279b2d1454 https://git.kernel.org/stable/c/aef540194effd768bed0bd2e6a74fe135a3d7c3a https://git.kernel.org/stable/c/b94ab9caa5d72c78226121cccff5e33f946da900 https://git.kernel.org/stable/c/beb9c55af609c4c7308259d7191688c75a4e3d4a https://git.kernel.org/stable/c/fec89d327d9b2b669b5bbdac209386c6317c3722

Frequently Asked Questions

What is CVE-2026-89926? +

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.

How do I check if I'm vulnerable to CVE-2026-89926? +

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.