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SUNRPC: reject duplicate CREDS_VALUE options

Type: advisorySource: Official CVE List1 source record

In the Linux kernel, the following vulnerability has been resolved: SUNRPC: reject duplicate CREDS_VALUE options gssx_dec_option_array() walks the wire-supplied option array and, for every entry whose name matches CREDS_VALUE, calls gssx_dec_linux_creds() on the same struct svc_cred. That helper unconditionally installs a fresh groups_alloc() result into creds->cr_group_info without releasing whatever pointer was already there: for (i = 0; i < count; i++) { ... decode name ... if (length == sizeof(CREDS_VALUE) && memcmp(p, CREDS_VALUE, sizeof(CREDS_VALUE)) == 0) { err = gssx_dec_linux_creds(xdr, creds); ... } } A reply that carries two CREDS_VALUE entries therefore overwrites cr_group_info on the second iteration and orphans the group_info allocated by the first call. The earlier free_creds path only releases the last cr_group_info via free_svc_cred(), so the first allocation's refcount stays at one and its kvmalloc-backed storage is leaked. No in-tree caller of gssp_accept_sec_context_upcall() expects more than one CREDS_VALUE per reply. Fix by tracking whether a CREDS_VALUE option has already been decoded and returning -EINVAL on any subsequent match, so the free_creds path releases the single group_info that was installed.

Announced Source revision 1
Original source ↗

CVE-2026-89539

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-2026-89539

Linux

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

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
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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": "1d658336b05f8697d6445834f8867f8ad5e4f735",
        "lessThan": "4b5ebb4f91a6152a0f7b1253f701197e5710d4da",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "1d658336b05f8697d6445834f8867f8ad5e4f735",
        "lessThan": "f615b884310bf82d0014e3b5a92eb9aa88146685",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "1d658336b05f8697d6445834f8867f8ad5e4f735",
        "lessThan": "7a1d0501cbb962beba23377035d667bf3c1726ee",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "1d658336b05f8697d6445834f8867f8ad5e4f735",
        "lessThan": "9d94f046b23de0f77849ea69133063c949297e30",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "1d658336b05f8697d6445834f8867f8ad5e4f735",
        "lessThan": "2e4ce62385c1b8a887c5370af058ac7b52a8eaf9",
        "versionType": "git"
      }
    ],
    "programFiles": [
      "net/sunrpc/auth_gss/gss_rpc_xdr.c"
    ],
    "defaultStatus": "unaffected"
  },
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "3.10"
      },
      {
        "status": "unaffected",
        "version": "0",
        "lessThan": "3.10",
        "versionType": "semver"
      },
      {
        "status": "unaffected",
        "version": "6.6.160",
        "versionType": "semver",
        "lessThanOrEqual": "6.6.*"
      },
      {
        "status": "unaffected",
        "version": "6.12.109",
        "versionType": "semver",
        "lessThanOrEqual": "6.12.*"
      },
      {
        "status": "unaffected",
        "version": "6.18.50",
        "versionType": "semver",
        "lessThanOrEqual": "6.18.*"
      },
      {
        "status": "unaffected",
        "version": "7.2.4",
        "versionType": "semver",
        "lessThanOrEqual": "7.2.*"
      },
      {
        "status": "unaffected",
        "version": "7.3",
        "versionType": "original_commit_for_fix",
        "lessThanOrEqual": "*"
      }
    ],
    "programFiles": [
      "net/sunrpc/auth_gss/gss_rpc_xdr.c"
    ],
    "defaultStatus": "affected"
  }
]
Related CVEs
CVE-2026-89539

Source reference: /cveMetadata/cveId

Publisher severity

No explicit severity was provided.

Event
#46675 · Revision 1
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