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CVE-2026-68162

Full vulnerability record from the local CVENow database.

Description

In the Linux kernel, the following vulnerability has been resolved: sctp: avoid auth_enable sysctl UAF during netns teardown proc_sctp_do_auth() updates the SCTP control socket after changing net.sctp.auth_enable. The handler gets the per-net SCTP state from ctl->data, so an already opened sysctl file can still target a network namespace while that namespace is being torn down. SCTP previously registered its per-net sysctls from sctp_defaults_init(), while the control socket is created later from sctp_ctrlsock_init(). This exposed a window during initialization where auth_enable was writable before net->sctp.ctl_sock existed, and a teardown window where auth_enable stayed writable after inet_ctl_sock_destroy() had released the control socket. Move the per-net SCTP sysctl registration into sctp_ctrlsock_init() after sctp_ctl_sock_init() succeeds, and unregister the sysctl table before destroying the control socket in sctp_ctrlsock_exit(). If sysctl registration fails after the control socket was created, destroy the control socket in the same init path. Make sctp_sysctl_net_unregister() tolerate a missing header and clear the saved pointer so init-error and exit paths can safely share the unregister helper.

Severity
HIGH
CVSS score
7.8 (v3.1)
Vulnerability status
Received
Source identifier
416baaa9-dc9f-4396-8d5f-8c081fb06d67
Published
2026-08-10 13:20:02.570000
Last modified
2026-10-19 21:17:56.770000
View original CVE JSON 
{
  "id": "CVE-2026-68162",
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "published": "2026-08-10T13:20:02.570",
  "lastModified": "2026-10-19T21:17:56.770",
  "vulnStatus": "Received",
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nsctp: avoid auth_enable sysctl UAF during netns teardown\n\nproc_sctp_do_auth() updates the SCTP control socket after changing\nnet.sctp.auth_enable. The handler gets the per-net SCTP state from\nctl->data, so an already opened sysctl file can still target a network\nnamespace while that namespace is being torn down.\n\nSCTP previously registered its per-net sysctls from sctp_defaults_init(),\nwhile the control socket is created later from sctp_ctrlsock_init(). This\nexposed a window during initialization where auth_enable was writable\nbefore net->sctp.ctl_sock existed, and a teardown window where auth_enable\nstayed writable after inet_ctl_sock_destroy() had released the control\nsocket.\n\nMove the per-net SCTP sysctl registration into sctp_ctrlsock_init() after\nsctp_ctl_sock_init() succeeds, and unregister the sysctl table before\ndestroying the control socket in sctp_ctrlsock_exit(). If sysctl\nregistration fails after the control socket was created, destroy the\ncontrol socket in the same init path.\n\nMake sctp_sysctl_net_unregister() tolerate a missing header and clear the\nsaved pointer so init-error and exit paths can safely share the unregister\nhelper."
    }
  ],
  "affected": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "affectedData": [
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "unaffected",
          "programFiles": [
            "net/sctp/protocol.c",
            "net/sctp/sysctl.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "versions": [
            {
              "version": "10c869a52f266e40f548cc3c565d14930a5edafc",
              "lessThan": "19573dcddb8819fd68d6cd1f916c1c99c3fa4ff4",
              "versionType": "git",
              "status": "affected"
            },
            {
              "version": "dc583e7e5f8515ca489c0df28e4362a70eade382",
              "lessThan": "ceb7190b5c873d4a1267a1600c5aa52c600e929f",
              "versionType": "git",
              "status": "affected"
            },
            {
              "version": "bd2a2939423566c654545fa3e96a656662a0af9e",
              "lessThan": "fd66854a22661929245f3d2b244c432bc8b1a150",
              "versionType": "git",
              "status": "affected"
            },
            {
              "version": "1b67030d39f2b00f94ac1f0af11ba6657589e4d3",
              "lessThan": "158f3cc332dc53f43ec20060233d7c3cecd6d912",
              "versionType": "git",
              "status": "affected"
            },
            {
              "version": "7ec30c54f339c640aa7e49d7e9f7bbed6bd42bf6",
              "lessThan": "66700c0719675e0e118ae83b2d7168dacd69dd3d",
              "versionType": "git",
              "status": "affected"
            },
            {
              "version": "c184bc621e3cef03ac9ba81a50dda2dae6a21d36",
              "lessThan": "626bda8cfe43dff19a9833ff6ba055a817b5455c",
              "versionType": "git",
              "status": "affected"
            },
            {
              "version": "15649fd5415eda664ef35780c2013adeb5d9c695",
              "lessThan": "be6aae9d1b91c603adb35872d37d40e83daf8758",
              "versionType": "git",
              "status": "affected"
            },
            {
              "version": "15649fd5415eda664ef35780c2013adeb5d9c695",
              "lessThan": "a50e73488e0bbdd262b3be3c9a1d8dd078382381",
              "versionType": "git",
              "status": "affected"
            },
            {
              "version": "15649fd5415eda664ef35780c2013adeb5d9c695",
              "lessThan": "f8d5e7846025f4ab15a461235f8ebae9094a361a",
              "versionType": "git",
              "status": "affected"
            },
            {
              "version": "5.4.290",
              "lessThan": "5.4.292",
              "versionType": "semver",
              "status": "affected"
            },
            {
              "version": "5.10.234",
              "lessThan": "5.10.266",
              "versionType": "semver",
              "status": "affected"
            },
            {
              "version": "5.15.177",
              "lessThan": "5.15.217",
              "versionType": "semver",
              "status": "affected"
            },
            {
              "version": "6.1.125",
              "lessThan": "6.1.184",
              "versionType": "semver",
              "status": "affected"
            },
            {
              "version": "6.6.72",
              "lessThan": "6.6.151",
              "versionType": "semver",
              "status": "affected"
            },
            {
              "version": "6.12.10",
              "lessThan": "6.12.101",
              "versionType": "semver",
              "status": "affected"
            }
          ]
        },
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "affected",
          "programFiles": [
            "net/sctp/protocol.c",
            "net/sctp/sysctl.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "versions": [
            {
              "version": "6.13",
              "status": "affected"
            },
            {
              "version": "0",
              "lessThan": "6.13",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "5.4.292",
              "lessThanOrEqual": "5.4.*",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "5.10.266",
              "lessThanOrEqual": "5.10.*",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "5.15.217",
              "lessThanOrEqual": "5.15.*",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "6.1.184",
              "lessThanOrEqual": "6.1.*",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "6.6.151",
              "lessThanOrEqual": "6.6.*",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "6.12.101",
              "lessThanOrEqual": "6.12.*",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "6.18.42",
              "lessThanOrEqual": "6.18.*",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "7.1.6",
              "lessThanOrEqual": "7.1.*",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "7.2",
              "lessThanOrEqual": "*",
              "versionType": "original_commit_for_fix",
              "status": "unaffected"
            }
          ]
        }
      ]
    }
  ],
  "metrics": {
    "cvssMetricV31": [
      {
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "type": "Secondary",
        "cvssData": {
          "version": "3.1",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
          "baseScore": 7.8,
          "baseSeverity": "HIGH",
          "attackVector": "LOCAL",
          "attackComplexity": "LOW",
          "privilegesRequired": "LOW",
          "userInteraction": "NONE",
          "scope": "UNCHANGED",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "availabilityImpact": "HIGH"
        },
        "exploitabilityScore": 1.8,
        "impactScore": 5.9
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "timestamp": "2026-10-16T15:45:25.940723Z",
          "id": "CVE-2026-68162",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "total"
            }
          ],
          "role": "CISA Coordinator",
          "version": "2.0.3"
        }
      }
    ]
  },
  "weaknesses": [
    {
      "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
      "type": "Secondary",
      "description": [
        {
          "lang": "en",
          "value": "CWE-416"
        }
      ]
    }
  ],
  "references": [
    {
      "url": "https://git.kernel.org/stable/c/158f3cc332dc53f43ec20060233d7c3cecd6d912",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
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    {
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    {
      "url": "https://git.kernel.org/stable/c/a50e73488e0bbdd262b3be3c9a1d8dd078382381",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
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    }
  ]
}