CVE-2026-31631 rxrpc: Fix buffer overread in rxgk_do_verify_authenticator()

[
  {
    "product": "Linux",
    "vendor": "Linux",
    "defaultStatus": "unaffected",
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "programFiles": [
      "net/rxrpc/rxgk.c"
    ],
    "versions": [
      {
        "version": "9d1d2b59341f58126a69b51f9f5f8ccb9f12e54a",
        "lessThan": "794586789800b16dcbe235452494f4223ac80413",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "9d1d2b59341f58126a69b51f9f5f8ccb9f12e54a",
        "lessThan": "1c4422d8be81718ecb15d79aedff607323085201",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "9d1d2b59341f58126a69b51f9f5f8ccb9f12e54a",
        "lessThan": "f564af387c8c28238f8ebc13314c589d7ba8475d",
        "status": "affected",
        "versionType": "git"
      }
    ]
  },
  {
    "product": "Linux",
    "vendor": "Linux",
    "defaultStatus": "affected",
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "programFiles": [
      "net/rxrpc/rxgk.c"
    ],
    "versions": [
      {
        "version": "6.16",
        "status": "affected"
      },
      {
        "version": "0",
        "lessThan": "6.16",
        "status": "unaffected",
        "versionType": "semver"
      },
      {
        "version": "6.18.23",
        "lessThanOrEqual": "6.18.*",
        "status": "unaffected",
        "versionType": "semver"
      },
      {
        "version": "6.19.13",
        "lessThanOrEqual": "6.19.*",
        "status": "unaffected",
        "versionType": "semver"
      },
      {
        "version": "7.0",
        "lessThanOrEqual": "*",
        "status": "unaffected",
        "versionType": "original_commit_for_fix"
      }
    ]
  }
]