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KVM: s390: Fix length check __import_wp_info()

Type: advisorySource: Official CVE List1 source record

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.

Announced Source revision 1
Original source ↗

CVE-2026-89926

Primary source · Revision 1

Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.

Security context

Source reference: cve:CVE-2026-89926

Linux

Source reference: /containers/cna/affected/0/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Linux

Source reference: /containers/cna/affected/1/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Structured affected-version data

Original package identities and version rules from this source.

[
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "27291e2165b6de70c476b7b675308113edd69a60",
        "lessThan": "aef540194effd768bed0bd2e6a74fe135a3d7c3a",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "27291e2165b6de70c476b7b675308113edd69a60",
        "lessThan": "71153d3262517e1c02c3a66aa5094f279b2d1454",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "27291e2165b6de70c476b7b675308113edd69a60",
        "lessThan": "fec89d327d9b2b669b5bbdac209386c6317c3722",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "27291e2165b6de70c476b7b675308113edd69a60",
        "lessThan": "b94ab9caa5d72c78226121cccff5e33f946da900",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "27291e2165b6de70c476b7b675308113edd69a60",
        "lessThan": "beb9c55af609c4c7308259d7191688c75a4e3d4a",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "27291e2165b6de70c476b7b675308113edd69a60",
        "lessThan": "3fe801db90bdeefb0bbdda42d832846b53f64f8a",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "27291e2165b6de70c476b7b675308113edd69a60",
        "lessThan": "4c07680a467e2f7697245bcd11691bffb2a6f0ed",
        "versionType": "git"
      }
    ],
    "programFiles": [
      "arch/s390/kvm/guestdbg.c"
    ],
    "defaultStatus": "unaffected"
  },
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "3.16"
      },
      {
        "status": "unaffected",
        "version": "0",
        "lessThan": "3.16",
        "versionType": "semver"
      },
      {
        "status": "unaffected",
        "version": "5.15.221",
        "versionType": "semver",
        "lessThanOrEqual": "5.15.*"
      },
      {
        "status": "unaffected",
        "version": "6.1.188",
        "versionType": "semver",
        "lessThanOrEqual": "6.1.*"
      },
      {
        "status": "unaffected",
        "version": "6.6.157",
        "versionType": "semver",
        "lessThanOrEqual": "6.6.*"
      },
      {
        "status": "unaffected",
        "version": "6.12.110",
        "versionType": "semver",
        "lessThanOrEqual": "6.12.*"
      },
      {
        "status": "unaffected",
        "version": "6.18.51",
        "versionType": "semver",
        "lessThanOrEqual": "6.18.*"
      },
      {
        "status": "unaffected",
        "version": "7.2.5",
        "versionType": "semver",
        "lessThanOrEqual": "7.2.*"
      },
      {
        "status": "unaffected",
        "version": "7.3",
        "versionType": "original_commit_for_fix",
        "lessThanOrEqual": "*"
      }
    ],
    "programFiles": [
      "arch/s390/kvm/guestdbg.c"
    ],
    "defaultStatus": "affected"
  }
]
Related CVEs
CVE-2026-89926

Source reference: /cveMetadata/cveId

Publisher severity

No explicit severity was provided.

Event
#36370 · Revision 1
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Publisher date
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