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SUNRPC: svcauth_gss: avoid NULL deref on zero length gss_token in gss_read_proxy_verf

Type: advisorySource: Official CVE List1 source record

In the Linux kernel, the following vulnerability has been resolved: SUNRPC: svcauth_gss: avoid NULL deref on zero length gss_token in gss_read_proxy_verf A zero length gss_token results in pages == 0 and in_token->pages[0] is NULL. The code unconditionally evaluates page_address(in_token->pages[0]) for the initial memcpy, which can dereference NULL even when the copy length is 0. Guard the first memcpy so it only runs when length > 0.

Announced Group revision 1
Original source ↗

CVE-2025-71120

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-2025-71120

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": "5866efa8cbfbadf3905072798e96652faf02dbe8",
        "lessThan": "a8f1e445ce3545c90d69c9e8ff8f7821825fe810",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "5866efa8cbfbadf3905072798e96652faf02dbe8",
        "lessThan": "4dedb6a11243a5c9eb9dbb97bca3c98bd725e83d",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "5866efa8cbfbadf3905072798e96652faf02dbe8",
        "lessThan": "f9e53f69ac3bc4ef568b08d3542edac02e83fefd",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "5866efa8cbfbadf3905072798e96652faf02dbe8",
        "lessThan": "7452d53f293379e2c38cfa8ad0694aa46fc4788b",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "5866efa8cbfbadf3905072798e96652faf02dbe8",
        "lessThan": "a2c6f25ab98b423f99ccd94874d655b8bcb01a19",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "5866efa8cbfbadf3905072798e96652faf02dbe8",
        "lessThan": "1c8bb965e9b0559ff0f5690615a527c30f651dd8",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "5866efa8cbfbadf3905072798e96652faf02dbe8",
        "lessThan": "d4b69a6186b215d2dc1ebcab965ed88e8d41768d",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "66ed7b413d31c6ff23901ac4443b1cc1af2f6113",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "7be8c165dc81564705e8e0b72d398ef708f67eaa",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "4.19.99",
        "lessThan": "4.20",
        "versionType": "semver"
      },
      {
        "status": "affected",
        "version": "5.4.15",
        "lessThan": "5.5",
        "versionType": "semver"
      }
    ],
    "programFiles": [
      "net/sunrpc/auth_gss/svcauth_gss.c"
    ],
    "defaultStatus": "unaffected"
  },
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "5.5"
      },
      {
        "status": "unaffected",
        "version": "0",
        "lessThan": "5.5",
        "versionType": "semver"
      },
      {
        "status": "unaffected",
        "version": "5.10.248",
        "versionType": "semver",
        "lessThanOrEqual": "5.10.*"
      },
      {
        "status": "unaffected",
        "version": "5.15.198",
        "versionType": "semver",
        "lessThanOrEqual": "5.15.*"
      },
      {
        "status": "unaffected",
        "version": "6.1.160",
        "versionType": "semver",
        "lessThanOrEqual": "6.1.*"
      },
      {
        "status": "unaffected",
        "version": "6.6.120",
        "versionType": "semver",
        "lessThanOrEqual": "6.6.*"
      },
      {
        "status": "unaffected",
        "version": "6.12.64",
        "versionType": "semver",
        "lessThanOrEqual": "6.12.*"
      },
      {
        "status": "unaffected",
        "version": "6.18.3",
        "versionType": "semver",
        "lessThanOrEqual": "6.18.*"
      },
      {
        "status": "unaffected",
        "version": "6.19",
        "versionType": "original_commit_for_fix",
        "lessThanOrEqual": "*"
      }
    ],
    "programFiles": [
      "net/sunrpc/auth_gss/svcauth_gss.c"
    ],
    "defaultStatus": "affected"
  }
]
Related CVEs
CVE-2025-71120

Source reference: /cveMetadata/cveId

Publisher severity

high

Source reference: /containers/cna/metrics

Event
#39162 · Revision 1
Added to Heist Feed
Publisher date
Read the original announcement

Revision history

  1. CVE-2025-71120 · Revision 1Source updated