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Buffer overflow in drivers/xen/sys-hypervisor.c

Type: advisorySource: Official CVE List1 source record

In the Linux kernel, the following vulnerability has been resolved: Buffer overflow in drivers/xen/sys-hypervisor.c The build id returned by HYPERVISOR_xen_version(XENVER_build_id) is neither NUL terminated nor a string. The first causes a buffer overflow as sprintf in buildid_show will read and copy till it finds a NUL. 00000000 f4 91 51 f4 dd 38 9e 9d 65 47 52 eb 10 71 db 50 |..Q..8..eGR..q.P| 00000010 b9 a8 01 42 6f 2e 32 |...Bo.2| 00000017 So use a memcpy instead of sprintf to have the correct value: 00000000 f4 91 51 f4 dd 00 9e 9d 65 47 52 eb 10 71 db 50 |..Q.....eGR..q.P| 00000010 b9 a8 01 42 |...B| 00000014 (the above have a hack to embed a zero inside and check it's returned correctly). This is XSA-485 / CVE-2026-31786

Announced Source revision 1
Original source ↗

CVE-2026-31786

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-2026-31786

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": "84b7625728ea311ea35bdaa0eded53c1c56baeaa",
        "lessThan": "e3af585e1728c917682b6a3de9a69b41fb9194d4",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "84b7625728ea311ea35bdaa0eded53c1c56baeaa",
        "lessThan": "8288d031a01dbacfde3fc643f7be3d23504de64d",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "84b7625728ea311ea35bdaa0eded53c1c56baeaa",
        "lessThan": "f458ba102da97fafca106327086fc95f3fc764cb",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "84b7625728ea311ea35bdaa0eded53c1c56baeaa",
        "lessThan": "4b4defd2fce3f966c25adabf46644a85558f1169",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "84b7625728ea311ea35bdaa0eded53c1c56baeaa",
        "lessThan": "5c5ff7c7bd15bb536f44b10b3fb5b8408f344d0a",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "84b7625728ea311ea35bdaa0eded53c1c56baeaa",
        "lessThan": "d5f59216650c51e5e3fcb7517c825bc8047f60ef",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "84b7625728ea311ea35bdaa0eded53c1c56baeaa",
        "lessThan": "52cecff98bda2c51eed1c6ce9d21c5d6268fb19d",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "84b7625728ea311ea35bdaa0eded53c1c56baeaa",
        "lessThan": "27fdbab4221b375de54bf91919798d88520c6e28",
        "versionType": "git"
      }
    ],
    "programFiles": [
      "drivers/xen/sys-hypervisor.c"
    ],
    "defaultStatus": "unaffected"
  },
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "4.13"
      },
      {
        "status": "unaffected",
        "version": "0",
        "lessThan": "4.13",
        "versionType": "semver"
      },
      {
        "status": "unaffected",
        "version": "5.10.254",
        "versionType": "semver",
        "lessThanOrEqual": "5.10.*"
      },
      {
        "status": "unaffected",
        "version": "5.15.204",
        "versionType": "semver",
        "lessThanOrEqual": "5.15.*"
      },
      {
        "status": "unaffected",
        "version": "6.1.170",
        "versionType": "semver",
        "lessThanOrEqual": "6.1.*"
      },
      {
        "status": "unaffected",
        "version": "6.6.137",
        "versionType": "semver",
        "lessThanOrEqual": "6.6.*"
      },
      {
        "status": "unaffected",
        "version": "6.12.85",
        "versionType": "semver",
        "lessThanOrEqual": "6.12.*"
      },
      {
        "status": "unaffected",
        "version": "6.18.26",
        "versionType": "semver",
        "lessThanOrEqual": "6.18.*"
      },
      {
        "status": "unaffected",
        "version": "7.0.3",
        "versionType": "semver",
        "lessThanOrEqual": "7.0.*"
      },
      {
        "status": "unaffected",
        "version": "7.1",
        "versionType": "original_commit_for_fix",
        "lessThanOrEqual": "*"
      }
    ],
    "programFiles": [
      "drivers/xen/sys-hypervisor.c"
    ],
    "defaultStatus": "affected"
  }
]
Related CVEs
CVE-2026-31786

Source reference: /cveMetadata/cveId

Publisher severity

high

Source reference: /containers/cna/metrics

Event
#40000 · Revision 1
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Publisher date
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