{"id":"CVE-2026-89926","state":"PUBLISHED","title":"KVM: s390: Fix length check __import_wp_info()","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.","publishedAt":"2026-09-16T10:32:18.785Z","updatedAt":"2026-10-30T12:33:28.105Z","severity":null,"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"27291e2165b6de70c476b7b675308113edd69a60","status":"affected","lessThan":"36d62dfb3cac66e6a97fd850a592c2ed56e35ba5","versionType":"git"},{"version":"27291e2165b6de70c476b7b675308113edd69a60","status":"affected","lessThan":"aef540194effd768bed0bd2e6a74fe135a3d7c3a","versionType":"git"},{"version":"27291e2165b6de70c476b7b675308113edd69a60","status":"affected","lessThan":"71153d3262517e1c02c3a66aa5094f279b2d1454","versionType":"git"},{"version":"27291e2165b6de70c476b7b675308113edd69a60","status":"affected","lessThan":"fec89d327d9b2b669b5bbdac209386c6317c3722","versionType":"git"},{"version":"27291e2165b6de70c476b7b675308113edd69a60","status":"affected","lessThan":"b94ab9caa5d72c78226121cccff5e33f946da900","versionType":"git"},{"version":"27291e2165b6de70c476b7b675308113edd69a60","status":"affected","lessThan":"beb9c55af609c4c7308259d7191688c75a4e3d4a","versionType":"git"},{"version":"27291e2165b6de70c476b7b675308113edd69a60","status":"affected","lessThan":"3fe801db90bdeefb0bbdda42d832846b53f64f8a","versionType":"git"},{"version":"27291e2165b6de70c476b7b675308113edd69a60","status":"affected","lessThan":"4c07680a467e2f7697245bcd11691bffb2a6f0ed","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["arch/s390/kvm/guestdbg.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"3.16","status":"affected"},{"version":"0","status":"unaffected","lessThan":"3.16","versionType":"semver"},{"version":"5.10.273","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.221","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.188","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.157","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.110","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.51","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.2.5","status":"unaffected","lessThanOrEqual":"7.2.*","versionType":"semver"},{"version":"7.3","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["arch/s390/kvm/guestdbg.c"]}],"references":["https://git.kernel.org/stable/c/36d62dfb3cac66e6a97fd850a592c2ed56e35ba5","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"],"weaknesses":[],"ingestedAt":"2026-10-30T12:52:04.348Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/89xxx/CVE-2026-89926.json","commit":"1f312381e38164a43607eebab851b151dd16861e","baselineCommit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-89926","state":"PUBLISHED","datePublished":"2026-09-16T10:32:18.785Z","dateUpdated":"2026-10-30T12:33:28.105Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-09-11T19:38:34.775Z"},"containers":{"cna":{"title":"KVM: s390: Fix length check __import_wp_info()","descriptions":[{"lang":"en","value":"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."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"27291e2165b6de70c476b7b675308113edd69a60","status":"affected","lessThan":"36d62dfb3cac66e6a97fd850a592c2ed56e35ba5","versionType":"git"},{"version":"27291e2165b6de70c476b7b675308113edd69a60","status":"affected","lessThan":"aef540194effd768bed0bd2e6a74fe135a3d7c3a","versionType":"git"},{"version":"27291e2165b6de70c476b7b675308113edd69a60","status":"affected","lessThan":"71153d3262517e1c02c3a66aa5094f279b2d1454","versionType":"git"},{"version":"27291e2165b6de70c476b7b675308113edd69a60","status":"affected","lessThan":"fec89d327d9b2b669b5bbdac209386c6317c3722","versionType":"git"},{"version":"27291e2165b6de70c476b7b675308113edd69a60","status":"affected","lessThan":"b94ab9caa5d72c78226121cccff5e33f946da900","versionType":"git"},{"version":"27291e2165b6de70c476b7b675308113edd69a60","status":"affected","lessThan":"beb9c55af609c4c7308259d7191688c75a4e3d4a","versionType":"git"},{"version":"27291e2165b6de70c476b7b675308113edd69a60","status":"affected","lessThan":"3fe801db90bdeefb0bbdda42d832846b53f64f8a","versionType":"git"},{"version":"27291e2165b6de70c476b7b675308113edd69a60","status":"affected","lessThan":"4c07680a467e2f7697245bcd11691bffb2a6f0ed","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["arch/s390/kvm/guestdbg.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"3.16","status":"affected"},{"version":"0","status":"unaffected","lessThan":"3.16","versionType":"semver"},{"version":"5.10.273","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.221","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.188","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.157","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.110","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.51","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.2.5","status":"unaffected","lessThanOrEqual":"7.2.*","versionType":"semver"},{"version":"7.3","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["arch/s390/kvm/guestdbg.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/36d62dfb3cac66e6a97fd850a592c2ed56e35ba5"},{"url":"https://git.kernel.org/stable/c/aef540194effd768bed0bd2e6a74fe135a3d7c3a"},{"url":"https://git.kernel.org/stable/c/71153d3262517e1c02c3a66aa5094f279b2d1454"},{"url":"https://git.kernel.org/stable/c/fec89d327d9b2b669b5bbdac209386c6317c3722"},{"url":"https://git.kernel.org/stable/c/b94ab9caa5d72c78226121cccff5e33f946da900"},{"url":"https://git.kernel.org/stable/c/beb9c55af609c4c7308259d7191688c75a4e3d4a"},{"url":"https://git.kernel.org/stable/c/3fe801db90bdeefb0bbdda42d832846b53f64f8a"},{"url":"https://git.kernel.org/stable/c/4c07680a467e2f7697245bcd11691bffb2a6f0ed"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-10-30T12:33:28.105Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.16","versionEndExcluding":"5.10.273"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.16","versionEndExcluding":"5.15.221"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.16","versionEndExcluding":"6.1.188"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.16","versionEndExcluding":"6.6.157"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.16","versionEndExcluding":"6.12.110"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.16","versionEndExcluding":"6.18.51"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.16","versionEndExcluding":"7.2.5"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.16","versionEndExcluding":"7.3"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}}}}}