CVE-2026-53075 (GCVE-0-2026-53075)

Vulnerability from cvelistv5 – Published: 2026-06-24 16:30 – Updated: 2026-06-28 06:38
VLAI
Title
ppp: require CAP_NET_ADMIN in target netns for unattached ioctls
Summary
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.
Severity
8.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 273ec51dd7ceaa76e038875d85061ec856d8905e , < c9edd90c57ae23692fff6b049fdfa4572a9fd532 (git)
Affected: 273ec51dd7ceaa76e038875d85061ec856d8905e , < 5080e188c914110034bbc569d5cfa2f06204681d (git)
Affected: 273ec51dd7ceaa76e038875d85061ec856d8905e , < 67e901e28d177ac9a9bed76d69ce3471e704a89e (git)
Affected: 273ec51dd7ceaa76e038875d85061ec856d8905e , < 954745d0223e7caec917c0b2d1a889ff56fa6e54 (git)
Affected: 273ec51dd7ceaa76e038875d85061ec856d8905e , < 3b2c2157dc2afc5c17cd7238afefca92f1ef330e (git)
Affected: 273ec51dd7ceaa76e038875d85061ec856d8905e , < 5013be175c7ffd8b39efbc3c9c4db5b10b85fea8 (git)
Affected: 273ec51dd7ceaa76e038875d85061ec856d8905e , < 1a8a51ce85075a56a743b6f142606dd2696a391c (git)
Affected: 273ec51dd7ceaa76e038875d85061ec856d8905e , < 2bb6379416fd19f44c3423a00bfd8626259f6067 (git)
Create a notification for this product.
Linux Linux Affected: 2.6.30
Unaffected: 0 , < 2.6.30 (semver)
Unaffected: 5.10.258 , ≤ 5.10.* (semver)
Unaffected: 5.15.209 , ≤ 5.15.* (semver)
Unaffected: 6.1.175 , ≤ 6.1.* (semver)
Unaffected: 6.6.141 , ≤ 6.6.* (semver)
Unaffected: 6.12.91 , ≤ 6.12.* (semver)
Unaffected: 6.18.33 , ≤ 6.18.* (semver)
Unaffected: 7.0.10 , ≤ 7.0.* (semver)
Unaffected: 7.1 , ≤ * (original_commit_for_fix)
Create a notification for this product.
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          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nppp: require CAP_NET_ADMIN in target netns for unattached ioctls\n\n/dev/ppp open is currently authorized against file-\u003ef_cred-\u003euser_ns,\nwhile unattached administrative ioctls operate on current-\u003ensproxy-\u003enet_ns.\n\nAs a result, a local unprivileged user can create a new user namespace\nwith CLONE_NEWUSER, gain CAP_NET_ADMIN only in that new user namespace,\nand still issue PPPIOCNEWUNIT, PPPIOCATTACH, or PPPIOCATTCHAN against\nan inherited network namespace.\n\nRequire CAP_NET_ADMIN in the user namespace that owns the target network\nnamespace before handling unattached PPP administrative ioctls.\n\nThis preserves normal pppd operation in the network namespace it is\nactually privileged in, while rejecting the userns-only inherited-netns\ncase."
        }
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        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-53075",
    "datePublished": "2026-06-24T16:30:16.214Z",
    "dateReserved": "2026-06-09T07:44:35.383Z",
    "dateUpdated": "2026-06-28T06:38:59.844Z",
    "state": "PUBLISHED"
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      "date": "2026-07-14",
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      "percentile": "0.07915"
    },
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      "version": "3"
    },
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    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-06-28T07:44:20+00:00",
      "cve": "CVE-2026-53075",
      "id": "CVE-2026-53075",
      "initial_release_date": "2026-06-24T00:00:00+00:00",
      "product_status:known_affected": "260",
      "product_status:known_not_affected": "14",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: ppp: require CAP_NET_ADMIN in target netns for unattached ioctls",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-53075.json",
      "version": "3"
    }
  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

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Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.