CVE-2026-89926KVM: s390: Fix length check __import_wp_info()
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No exploitation reported and no EPSS estimate yet.
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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.
- CVSS
- Not yet scored
- Weakness (CWE)
- Not given
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Linux
- NVD analysis
- Received
- Record last updated
- Sep 16, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Linux Linux linux:linux (from the name) | from 27291e2165b6de70c476b7b675308113edd69a60 before aef540194effd768bed0bd2e6a74fe135a3d7c3a; from 27291e2165b6de70c476b7b675308113edd69a60 before 71153d3262517e1c02c3a66aa5094f279b2d1454; from 27291e2165b6de70c476b7b675308113edd69a60 before fec89d327d9b2b669b5bbdac209386c6317c3722; from 27291e2165b6de70c476b7b675308113edd69a60 before b94ab9caa5d72c78226121cccff5e33f946da900; from 27291e2165b6de70c476b7b675308113edd69a60 before beb9c55af609c4c7308259d7191688c75a4e3d4a; 27291e2165b6de70c476b7b675308113edd69a60 builds before 3fe801db90bdeefb0bbdda42d832846b53f64f8a; 27291e2165b6de70c476b7b675308113edd69a60 builds before 4c07680a467e2f7697245bcd11691bffb2a6f0ed | CNA record |
References
- https://git.kernel.org/stable/c/aef540194effd768bed0bd2e6a74fe135a3d7c3a
- https://git.kernel.org/stable/c/71153d3262517e1c02c3a66aa5094f279b2d1454
- https://git.kernel.org/stable/c/fec89d327d9b2b669b5bbdac209386c6317c3722
- https://git.kernel.org/stable/c/b94ab9caa5d72c78226121cccff5e33f946da900
- https://git.kernel.org/stable/c/beb9c55af609c4c7308259d7191688c75a4e3d4a
- https://git.kernel.org/stable/c/3fe801db90bdeefb0bbdda42d832846b53f64f8a
- https://git.kernel.org/stable/c/4c07680a467e2f7697245bcd11691bffb2a6f0ed
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.