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NFSv4/pNFS: reject zero-length r_addr in nfs4_decode_mp_ds_addr

Type: advisorySource: Official CVE List1 source record

In the Linux kernel, the following vulnerability has been resolved: NFSv4/pNFS: reject zero-length r_addr in nfs4_decode_mp_ds_addr nfs4_decode_mp_ds_addr() decodes the r_netid and r_addr opaques of a netaddr4 from a GETDEVICEINFO multipath-DS body, then immediately calls strrchr(buf, '.') to locate the port separator. Both decodes use xdr_stream_decode_string_dup(), and the current code checks only "nlen < 0" / "rlen < 0" before dereferencing the returned string. When the on-wire opaque has length zero, xdr_stream_decode_opaque_inline() returns 0 and xdr_stream_decode_string_dup() falls through to its "*str = NULL; return ret" tail, leaving buf NULL with a return value of 0. The "< 0" check does not catch this, and the next line is strrchr(NULL, '.'), a kernel NULL pointer dereference reachable from any pNFS-flexfile client mounted against a malicious or compromised metadata server. Reject the zero-length cases explicitly so the decoder fails with -EBADMSG (treated as a malformed GETDEVICEINFO body) instead of panicking the client.

Announced Source revision 1
Original source ↗

CVE-2026-53391

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-2026-53391

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": "6b7f3cf96364eaf597940cb5c68a682894829915",
        "lessThan": "76b94cbd32aacf36a641956385a852635c6802b9",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "6b7f3cf96364eaf597940cb5c68a682894829915",
        "lessThan": "c8e4e0c701d0192a2efb6df059c0f9e19678c23d",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "6b7f3cf96364eaf597940cb5c68a682894829915",
        "lessThan": "6c344fff2feff9d4d716d8e4ad40e9b5040ee5ea",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "6b7f3cf96364eaf597940cb5c68a682894829915",
        "lessThan": "427ab81a811dab4bca9d19f82eec5847ae42646e",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "6b7f3cf96364eaf597940cb5c68a682894829915",
        "lessThan": "012d37a568bfbb2c9686f03ade75560bc7139956",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "6b7f3cf96364eaf597940cb5c68a682894829915",
        "lessThan": "30aae62e50b4e074a90a9a5e15246548fbdc1182",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "6b7f3cf96364eaf597940cb5c68a682894829915",
        "lessThan": "41fe0f7b84f0cb822ae10ab08592996a592b2a25",
        "versionType": "git"
      }
    ],
    "programFiles": [
      "fs/nfs/pnfs_nfs.c"
    ],
    "defaultStatus": "unaffected"
  },
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "4.0"
      },
      {
        "status": "unaffected",
        "version": "0",
        "lessThan": "4.0",
        "versionType": "semver"
      },
      {
        "status": "unaffected",
        "version": "5.15.211",
        "versionType": "semver",
        "lessThanOrEqual": "5.15.*"
      },
      {
        "status": "unaffected",
        "version": "6.1.177",
        "versionType": "semver",
        "lessThanOrEqual": "6.1.*"
      },
      {
        "status": "unaffected",
        "version": "6.6.144",
        "versionType": "semver",
        "lessThanOrEqual": "6.6.*"
      },
      {
        "status": "unaffected",
        "version": "6.12.95",
        "versionType": "semver",
        "lessThanOrEqual": "6.12.*"
      },
      {
        "status": "unaffected",
        "version": "6.18.38",
        "versionType": "semver",
        "lessThanOrEqual": "6.18.*"
      },
      {
        "status": "unaffected",
        "version": "7.1.3",
        "versionType": "semver",
        "lessThanOrEqual": "7.1.*"
      },
      {
        "status": "unaffected",
        "version": "7.2",
        "versionType": "original_commit_for_fix",
        "lessThanOrEqual": "*"
      }
    ],
    "programFiles": [
      "fs/nfs/pnfs_nfs.c"
    ],
    "defaultStatus": "affected"
  }
]
Related CVEs
CVE-2026-53391

Source reference: /cveMetadata/cveId

Publisher severity

high

Source reference: /containers/cna/metrics

Event
#40820 · Revision 1
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Publisher date
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