KVM: s390: Fix length check __import_wp_info()
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.
- Products
- Kernel
- Affected versions
- Not specified
- Fixed versions
- 5.10.273, 5.15.221, 6.1.188, 6.12.110, 6.18.51, 6.6.157, 7.2.5
- CVEs
- CVE-2026-89926
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 4 Nov 2026, 16:49 UTC · Revision 1
Source evidence
KVM: s390: Fix length check __import_wp_info()
core-osv · Original sourcePublished 16 Sept 2026, 10:32 UTC
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.
osv:CVE-2026-89926
Kernel
Fixed versions: 5.10.273, 5.15.221, 6.1.188, 6.6.157, 6.12.110, 6.18.51, 7.2.5
Complete source record
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"id": "5099d50c8423e509486cc3c321958e71c1d22c80979b64e85f92c02a9b5dc13f",
"url": "https://osv.dev/vulnerability/CVE-2026-89926",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "KVM: s390: Fix length check __import_wp_info()",
"summary": "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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"modified": "2026-11-01T02:31:01.702673469Z",
"provider": "osv",
"references": [
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"security_relevant": true,
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"source_id": "core-osv",
"document_id": 504915,
"published_at": "2026-09-16T10:32:18.785+00:00"
}