CVE-2026-89926 (GCVE-0-2026-89926)

Vulnerability from cvelistv5 – Published: 2026-09-16 10:32 – Updated: 2026-09-16 10:32
VLAI
Title
KVM: s390: Fix length check __import_wp_info()
Summary
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.
Severity
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 27291e2165b6de70c476b7b675308113edd69a60 , < aef540194effd768bed0bd2e6a74fe135a3d7c3a (git)
Affected: 27291e2165b6de70c476b7b675308113edd69a60 , < 71153d3262517e1c02c3a66aa5094f279b2d1454 (git)
Affected: 27291e2165b6de70c476b7b675308113edd69a60 , < fec89d327d9b2b669b5bbdac209386c6317c3722 (git)
Affected: 27291e2165b6de70c476b7b675308113edd69a60 , < b94ab9caa5d72c78226121cccff5e33f946da900 (git)
Affected: 27291e2165b6de70c476b7b675308113edd69a60 , < beb9c55af609c4c7308259d7191688c75a4e3d4a (git)
Affected: 27291e2165b6de70c476b7b675308113edd69a60 , < 3fe801db90bdeefb0bbdda42d832846b53f64f8a (git)
Affected: 27291e2165b6de70c476b7b675308113edd69a60 , < 4c07680a467e2f7697245bcd11691bffb2a6f0ed (git)
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Linux Linux Affected: 3.16
Unaffected: 0 , < 3.16 (semver)
Unaffected: 5.15.221 , ≤ 5.15.* (semver)
Unaffected: 6.1.188 , ≤ 6.1.* (semver)
Unaffected: 6.6.157 , ≤ 6.6.* (semver)
Unaffected: 6.12.110 , ≤ 6.12.* (semver)
Unaffected: 6.18.51 , ≤ 6.18.* (semver)
Unaffected: 7.2.5 , ≤ 7.2.* (semver)
Unaffected: 7.3-rc1 , ≤ * (original_commit_for_fix)
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          "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-\u003elen, which is an int. The bounds\ncheck is done on the truncated value while the allocation uses the\nuntruncated one:\n\n\twp_info-\u003elen = bp_data-\u003elen;\n\t[...]\n\tif (wp_info-\u003elen \u003c 0 || wp_info-\u003elen \u003e MAX_WP_SIZE)\n\t\treturn -EINVAL;\n\n\twp_info-\u003eold_data = kmalloc(bp_data-\u003elen, GFP_KERNEL_ACCOUNT);\n\nUse the validated value for the allocation as intended. Without this\nfix userspace can trigger \u003e4GB allocations which will fail and result\nin a WARN due to MAX_PAGE_ORDER."
        }
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            "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-\u003elen, which is an int. The bounds\ncheck is done on the truncated value while the allocation uses the\nuntruncated one:\n\n\twp_info-\u003elen = bp_data-\u003elen;\n\t[...]\n\tif (wp_info-\u003elen \u003c 0 || wp_info-\u003elen \u003e MAX_WP_SIZE)\n\t\treturn -EINVAL;\n\n\twp_info-\u003eold_data = kmalloc(bp_data-\u003elen, GFP_KERNEL_ACCOUNT);\n\nUse the validated value for the allocation as intended. Without this\nfix userspace can trigger \u003e4GB allocations which will fail and result\nin a WARN due to MAX_PAGE_ORDER."
          }
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        "lastModified": "2026-09-16T11:17:01.777",
        "metrics": {},
        "published": "2026-09-16T11:17:01.777",
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        "vulnStatus": "Received"
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  }
}



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Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
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