{"cve":"CVE-2026-89926","nvd":{"published":"2026-09-16T11:17:01.777","modified":"2026-10-19T09:18:38.150","status":"Received","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nKVM: s390: Fix length check __import_wp_info()\n\nstruct kvm_hw_breakpoint::len is a __u64 that is fully controlled by user\nspace. This is then assigned to wp_info->len, which is an int. The bounds\ncheck is done on the truncated value while the allocation uses the\nuntruncated one:\n\n\twp_info->len = bp_data->len;\n\t[...]\n\tif (wp_info->len < 0 || wp_info->len > MAX_WP_SIZE)\n\t\treturn -EINVAL;\n\n\twp_info->old_data = kmalloc(bp_data->len, GFP_KERNEL_ACCOUNT);\n\nUse the validated value for the allocation as intended. Without this\nfix userspace can trigger >4GB allocations which will fail and result\nin a WARN due to MAX_PAGE_ORDER.","cvss_v4":null,"cvss_v3":null,"cwes":[],"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"],"products":[],"source":"nvd","synced_at":"2026-10-19T22:54:41.405518556+00:00"},"epss":{"cve":"CVE-2026-89926","score":0.00206,"percentile":0.10492,"date":"2026-10-25"},"kev":null,"osv":[],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}