{"id":"CVE-2026-89926","published":"2026-09-16T11:17:01.777","lastModified":"2026-09-16T11:17:01.777","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.","cvssScore":null,"cvssSeverity":null,"cvssVector":null,"cwes":[],"vendors":[],"products":[],"references":[{"url":"https://git.kernel.org/stable/c/3fe801db90bdeefb0bbdda42d832846b53f64f8a","tags":[]},{"url":"https://git.kernel.org/stable/c/4c07680a467e2f7697245bcd11691bffb2a6f0ed","tags":[]},{"url":"https://git.kernel.org/stable/c/71153d3262517e1c02c3a66aa5094f279b2d1454","tags":[]},{"url":"https://git.kernel.org/stable/c/aef540194effd768bed0bd2e6a74fe135a3d7c3a","tags":[]},{"url":"https://git.kernel.org/stable/c/b94ab9caa5d72c78226121cccff5e33f946da900","tags":[]},{"url":"https://git.kernel.org/stable/c/beb9c55af609c4c7308259d7191688c75a4e3d4a","tags":[]},{"url":"https://git.kernel.org/stable/c/fec89d327d9b2b669b5bbdac209386c6317c3722","tags":[]}],"exploitRefs":[],"hasPoc":false,"ai":null}