{
  "threat_severity" : "Moderate",
  "public_date" : "2026-07-29T00:00:00Z",
  "bugzilla" : {
    "description" : "kernel: s390/pkey: Check length in PKEY_VERIFYPROTK ioctl",
    "id" : "2508488",
    "url" : "https://bugzilla.redhat.com/show_bug.cgi?id=2508488"
  },
  "cvss3" : {
    "cvss3_base_score" : "7.0",
    "cvss3_scoring_vector" : "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H",
    "status" : "draft"
  },
  "cwe" : "CWE-805",
  "details" : [ "In the Linux kernel, the following vulnerability has been resolved:\ns390/pkey: Check length in PKEY_VERIFYPROTK ioctl\nExplicitly check the buffer length request structure provided by\nuser-space and fail, if it exceeds the buffer size.", "A flaw was found in the Linux kernel. A missing buffer length check in the `PKEY_VERIFYPROTK ioctl` within the `s390/pkey` module allows a local attacker to provide a buffer length request that exceeds the allocated buffer size. This could lead to information disclosure by reading out-of-bounds memory or a denial of service by crashing the system." ],
  "package_state" : [ {
    "product_name" : "Red Hat Enterprise Linux 10",
    "fix_state" : "Affected",
    "package_name" : "kernel",
    "cpe" : "cpe:/o:redhat:enterprise_linux:10"
  }, {
    "product_name" : "Red Hat Enterprise Linux 6",
    "fix_state" : "Not affected",
    "package_name" : "kernel",
    "cpe" : "cpe:/o:redhat:enterprise_linux:6"
  }, {
    "product_name" : "Red Hat Enterprise Linux 7",
    "fix_state" : "Not affected",
    "package_name" : "kernel",
    "cpe" : "cpe:/o:redhat:enterprise_linux:7"
  }, {
    "product_name" : "Red Hat Enterprise Linux 7",
    "fix_state" : "Not affected",
    "package_name" : "kernel-rt",
    "cpe" : "cpe:/o:redhat:enterprise_linux:7"
  }, {
    "product_name" : "Red Hat Enterprise Linux 8",
    "fix_state" : "Not affected",
    "package_name" : "kernel",
    "cpe" : "cpe:/o:redhat:enterprise_linux:8"
  }, {
    "product_name" : "Red Hat Enterprise Linux 8",
    "fix_state" : "Not affected",
    "package_name" : "kernel-rt",
    "cpe" : "cpe:/o:redhat:enterprise_linux:8"
  }, {
    "product_name" : "Red Hat Enterprise Linux 9",
    "fix_state" : "Affected",
    "package_name" : "kernel",
    "cpe" : "cpe:/o:redhat:enterprise_linux:9"
  }, {
    "product_name" : "Red Hat Enterprise Linux 9",
    "fix_state" : "Affected",
    "package_name" : "kernel-rt",
    "cpe" : "cpe:/o:redhat:enterprise_linux:9"
  } ],
  "references" : [ "https://www.cve.org/CVERecord?id=CVE-2026-64559\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-64559\nhttps://lore.kernel.org/linux-cve-announce/2026072914-CVE-2026-64559-839b@gregkh/T" ],
  "name" : "CVE-2026-64559",
  "csaw" : false
}