# CVE-2026-89926: linux: In the Linux kernel, the following vulnerability has been resolved:  KVM: s390: Fix length check __import_wp_info()...

CVE-2026-89926 is fixed in 2 products on 1 platform, first by DEBIAN-CVE-2026-89926, released September 23, 2026. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2026-89926
- Priority: Routine
- CVSS: n/a
- EPSS: 0.0022
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Sep 16, 2026

## 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.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | linux Debian 12.15 (bookworm) | 6.1.190-1 | [DEBIAN-CVE-2026-89926](https://patchblox.com/security/data/fix/linux/debian-cve-2026-89926.md) | Sep 23, 2026 |
| Linux | linux Debian 13.5 (trixie) | 6.12.111-1 | [DEBIAN-CVE-2026-89926](https://patchblox.com/security/data/fix/linux/debian-cve-2026-89926.md) | Sep 23, 2026 |
| Linux | linux Debian 14 | 7.2.6-1 | [DEBIAN-CVE-2026-89926](https://patchblox.com/security/data/fix/linux/debian-cve-2026-89926.md) | Sep 23, 2026 |
| Linux | linux-6.12 Debian 12.15 (bookworm) | 6.12.111-1~deb12u1 | [DEBIAN-CVE-2026-89926](https://patchblox.com/security/data/fix/linux/debian-cve-2026-89926.md) | Sep 23, 2026 |

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Data as of 2026-11-08T06:59:42Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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