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ppp: require CAP_NET_ADMIN in target netns for unattached ioctls

Type: advisorySource: Official CVE List1 source record

In the Linux kernel, the following vulnerability has been resolved: ppp: require CAP_NET_ADMIN in target netns for unattached ioctls /dev/ppp open is currently authorized against file->f_cred->user_ns, while unattached administrative ioctls operate on current->nsproxy->net_ns. As a result, a local unprivileged user can create a new user namespace with CLONE_NEWUSER, gain CAP_NET_ADMIN only in that new user namespace, and still issue PPPIOCNEWUNIT, PPPIOCATTACH, or PPPIOCATTCHAN against an inherited network namespace. Require CAP_NET_ADMIN in the user namespace that owns the target network namespace before handling unattached PPP administrative ioctls. This preserves normal pppd operation in the network namespace it is actually privileged in, while rejecting the userns-only inherited-netns case.

Announced Source revision 1
Original source ↗

CVE-2026-53075

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-2026-53075

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": "273ec51dd7ceaa76e038875d85061ec856d8905e",
        "lessThan": "c9edd90c57ae23692fff6b049fdfa4572a9fd532",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "273ec51dd7ceaa76e038875d85061ec856d8905e",
        "lessThan": "5080e188c914110034bbc569d5cfa2f06204681d",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "273ec51dd7ceaa76e038875d85061ec856d8905e",
        "lessThan": "67e901e28d177ac9a9bed76d69ce3471e704a89e",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "273ec51dd7ceaa76e038875d85061ec856d8905e",
        "lessThan": "954745d0223e7caec917c0b2d1a889ff56fa6e54",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "273ec51dd7ceaa76e038875d85061ec856d8905e",
        "lessThan": "3b2c2157dc2afc5c17cd7238afefca92f1ef330e",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "273ec51dd7ceaa76e038875d85061ec856d8905e",
        "lessThan": "5013be175c7ffd8b39efbc3c9c4db5b10b85fea8",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "273ec51dd7ceaa76e038875d85061ec856d8905e",
        "lessThan": "1a8a51ce85075a56a743b6f142606dd2696a391c",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "273ec51dd7ceaa76e038875d85061ec856d8905e",
        "lessThan": "2bb6379416fd19f44c3423a00bfd8626259f6067",
        "versionType": "git"
      }
    ],
    "programFiles": [
      "drivers/net/ppp/ppp_generic.c"
    ],
    "defaultStatus": "unaffected"
  },
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "2.6.30"
      },
      {
        "status": "unaffected",
        "version": "0",
        "lessThan": "2.6.30",
        "versionType": "semver"
      },
      {
        "status": "unaffected",
        "version": "5.10.258",
        "versionType": "semver",
        "lessThanOrEqual": "5.10.*"
      },
      {
        "status": "unaffected",
        "version": "5.15.209",
        "versionType": "semver",
        "lessThanOrEqual": "5.15.*"
      },
      {
        "status": "unaffected",
        "version": "6.1.175",
        "versionType": "semver",
        "lessThanOrEqual": "6.1.*"
      },
      {
        "status": "unaffected",
        "version": "6.6.141",
        "versionType": "semver",
        "lessThanOrEqual": "6.6.*"
      },
      {
        "status": "unaffected",
        "version": "6.12.91",
        "versionType": "semver",
        "lessThanOrEqual": "6.12.*"
      },
      {
        "status": "unaffected",
        "version": "6.18.33",
        "versionType": "semver",
        "lessThanOrEqual": "6.18.*"
      },
      {
        "status": "unaffected",
        "version": "7.0.10",
        "versionType": "semver",
        "lessThanOrEqual": "7.0.*"
      },
      {
        "status": "unaffected",
        "version": "7.1",
        "versionType": "original_commit_for_fix",
        "lessThanOrEqual": "*"
      }
    ],
    "programFiles": [
      "drivers/net/ppp/ppp_generic.c"
    ],
    "defaultStatus": "affected"
  }
]
Related CVEs
CVE-2026-53075

Source reference: /cveMetadata/cveId

Publisher severity

high

Source reference: /containers/cna/metrics

Event
#40742 · Revision 1
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Publisher date
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