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EUVD-2026-357843

European Vulnerability Database identifier assigned by ENISA

Reserved

2026-10-02 08:29

Assigner

ENISA

Alias of

a CVE record, shown under related vulnerabilities. This identifier carries no description, severity or references of its own: they belong to that CVE.

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{
  "assigner": "ENISA",
  "date_reserved": "2026-10-02T08:29:21.246732+00:00",
  "id": "EUVD-2026-357843"
}

CVE-2026-68162 (GCVE-0-2026-68162)

Vulnerability from cvelistv5 – Published: 2026-08-10 11:59 – Updated: 2026-08-23 12:46

Title

sctp: avoid auth_enable sysctl UAF during netns teardown

Summary

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

7.8 (High)


                        
                          CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Assigner

Linux mitre root Scorecard

References

9 references

URL	Tags
https://git.kernel.org/stable/c/19573dcddb8819fd6…
https://git.kernel.org/stable/c/ceb7190b5c873d4a1…
https://git.kernel.org/stable/c/fd66854a226619292…
https://git.kernel.org/stable/c/158f3cc332dc53f43…
https://git.kernel.org/stable/c/66700c0719675e0e1…
https://git.kernel.org/stable/c/626bda8cfe43dff19…
https://git.kernel.org/stable/c/be6aae9d1b91c603a…
https://git.kernel.org/stable/c/a50e73488e0bbdd26…
https://git.kernel.org/stable/c/f8d5e7846025f4ab1…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 10c869a52f266e40f548cc3c565d14930a5edafc , < 19573dcddb8819fd68d6cd1f916c1c99c3fa4ff4 (git) Affected: dc583e7e5f8515ca489c0df28e4362a70eade382 , < ceb7190b5c873d4a1267a1600c5aa52c600e929f (git) Affected: bd2a2939423566c654545fa3e96a656662a0af9e , < fd66854a22661929245f3d2b244c432bc8b1a150 (git) Affected: 1b67030d39f2b00f94ac1f0af11ba6657589e4d3 , < 158f3cc332dc53f43ec20060233d7c3cecd6d912 (git) Affected: 7ec30c54f339c640aa7e49d7e9f7bbed6bd42bf6 , < 66700c0719675e0e118ae83b2d7168dacd69dd3d (git) Affected: c184bc621e3cef03ac9ba81a50dda2dae6a21d36 , < 626bda8cfe43dff19a9833ff6ba055a817b5455c (git) Affected: 15649fd5415eda664ef35780c2013adeb5d9c695 , < be6aae9d1b91c603adb35872d37d40e83daf8758 (git) Affected: 15649fd5415eda664ef35780c2013adeb5d9c695 , < a50e73488e0bbdd262b3be3c9a1d8dd078382381 (git) Affected: 15649fd5415eda664ef35780c2013adeb5d9c695 , < f8d5e7846025f4ab15a461235f8ebae9094a361a (git) Affected: 5.4.290 , < 5.4.292 (semver) Affected: 5.10.234 , < 5.10.266 (semver) Affected: 5.15.177 , < 5.15.217 (semver) Affected: 6.1.125 , < 6.1.184 (semver) Affected: 6.6.72 , < 6.6.151 (semver) Affected: 6.12.10 , < 6.12.101 (semver)
Linux	Linux	Affected: 6.13 Unaffected: 0 , < 6.13 (semver) Unaffected: 5.4.292 , ≤ 5.4.* (semver) Unaffected: 5.10.266 , ≤ 5.10.* (semver) Unaffected: 5.15.217 , ≤ 5.15.* (semver) Unaffected: 6.1.184 , ≤ 6.1.* (semver) Unaffected: 6.6.151 , ≤ 6.6.* (semver) Unaffected: 6.12.101 , ≤ 6.12.* (semver) Unaffected: 6.18.42 , ≤ 6.18.* (semver) Unaffected: 7.1.6 , ≤ 7.1.* (semver) Unaffected: 7.2 , ≤ * (original_commit_for_fix)

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JSON

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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/sctp/protocol.c",
            "net/sctp/sysctl.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "19573dcddb8819fd68d6cd1f916c1c99c3fa4ff4",
              "status": "affected",
              "version": "10c869a52f266e40f548cc3c565d14930a5edafc",
              "versionType": "git"
            },
            {
              "lessThan": "ceb7190b5c873d4a1267a1600c5aa52c600e929f",
              "status": "affected",
              "version": "dc583e7e5f8515ca489c0df28e4362a70eade382",
              "versionType": "git"
            },
            {
              "lessThan": "fd66854a22661929245f3d2b244c432bc8b1a150",
              "status": "affected",
              "version": "bd2a2939423566c654545fa3e96a656662a0af9e",
              "versionType": "git"
            },
            {
              "lessThan": "158f3cc332dc53f43ec20060233d7c3cecd6d912",
              "status": "affected",
              "version": "1b67030d39f2b00f94ac1f0af11ba6657589e4d3",
              "versionType": "git"
            },
            {
              "lessThan": "66700c0719675e0e118ae83b2d7168dacd69dd3d",
              "status": "affected",
              "version": "7ec30c54f339c640aa7e49d7e9f7bbed6bd42bf6",
              "versionType": "git"
            },
            {
              "lessThan": "626bda8cfe43dff19a9833ff6ba055a817b5455c",
              "status": "affected",
              "version": "c184bc621e3cef03ac9ba81a50dda2dae6a21d36",
              "versionType": "git"
            },
            {
              "lessThan": "be6aae9d1b91c603adb35872d37d40e83daf8758",
              "status": "affected",
              "version": "15649fd5415eda664ef35780c2013adeb5d9c695",
              "versionType": "git"
            },
            {
              "lessThan": "a50e73488e0bbdd262b3be3c9a1d8dd078382381",
              "status": "affected",
              "version": "15649fd5415eda664ef35780c2013adeb5d9c695",
              "versionType": "git"
            },
            {
              "lessThan": "f8d5e7846025f4ab15a461235f8ebae9094a361a",
              "status": "affected",
              "version": "15649fd5415eda664ef35780c2013adeb5d9c695",
              "versionType": "git"
            },
            {
              "lessThan": "5.4.292",
              "status": "affected",
              "version": "5.4.290",
              "versionType": "semver"
            },
            {
              "lessThan": "5.10.266",
              "status": "affected",
              "version": "5.10.234",
              "versionType": "semver"
            },
            {
              "lessThan": "5.15.217",
              "status": "affected",
              "version": "5.15.177",
              "versionType": "semver"
            },
            {
              "lessThan": "6.1.184",
              "status": "affected",
              "version": "6.1.125",
              "versionType": "semver"
            },
            {
              "lessThan": "6.6.151",
              "status": "affected",
              "version": "6.6.72",
              "versionType": "semver"
            },
            {
              "lessThan": "6.12.101",
              "status": "affected",
              "version": "6.12.10",
              "versionType": "semver"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "net/sctp/protocol.c",
            "net/sctp/sysctl.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.13"
            },
            {
              "lessThan": "6.13",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.4.*",
              "status": "unaffected",
              "version": "5.4.292",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
              "version": "5.10.266",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.217",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.184",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.151",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.101",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.42",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.1.*",
              "status": "unaffected",
              "version": "7.1.6",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.2",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.4.292",
                  "versionStartIncluding": "5.4.290",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.10.266",
                  "versionStartIncluding": "5.10.234",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.15.217",
                  "versionStartIncluding": "5.15.177",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.1.184",
                  "versionStartIncluding": "6.1.125",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.6.151",
                  "versionStartIncluding": "6.6.72",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.101",
                  "versionStartIncluding": "6.12.10",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.42",
                  "versionStartIncluding": "6.13",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.1.6",
                  "versionStartIncluding": "6.13",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.2",
                  "versionStartIncluding": "6.13",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "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-\u003edata, 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-\u003esctp.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."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 7.8,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:L - The bug is triggered only by writing the per-net sysctl net.sctp.auth_enable via /proc/sys (proc_sctp_do_auth); it is not reachable from SCTP packet receive, sockets, or other remote protocol paths.\nAC:L - An attacker can open the sysctl file, concurrently destroy the target network namespace, and repeatedly write during teardown; pernet exit destroys ctl_sock before unregistering sysctls, and the attacker controls both sides of that race.\nPR:L - Exploitation requires writing a mode 0644 sysctl in a network namespace; an unprivileged host user with CAP_NET_ADMIN via user namespaces can create a netns, become namespace root, and write net/sctp/auth_enable without init-namespace privileges.\nUI:N - No victim interaction is required beyond the attacker opening the sysctl and triggering namespace teardown in their own threads or processes.\nS:U - Impact is confined to kernel memory corruption and privilege escalation within the same host/kernel security domain; it does not cross VM, container, or IOMMU boundaries by itself.\nC:H - proc_sctp_do_auth dereferences net-\u003esctp.ctl_sock after inet_ctl_sock_destroy; lock_sock and sctp_sk(sk)-\u003eep access freed socket/endpoint memory, a use-after-free that can disclose or infer heap contents.\nI:H - On a successful write, the handler sets sctp_sk(sk)-\u003eep-\u003eauth_enable on a freed endpoint object, giving a controlled heap write primitive that can be developed into arbitrary kernel modification or code execution.\nA:H - Use-after-free on the SCTP control socket/endpoint during sysctl processing can cause kernel oops/panic from lock_sock or ep access on freed memory, even when full exploitation is not attempted."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-23T12:46:01.222Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/19573dcddb8819fd68d6cd1f916c1c99c3fa4ff4"
        },
        {
          "url": "https://git.kernel.org/stable/c/ceb7190b5c873d4a1267a1600c5aa52c600e929f"
        },
        {
          "url": "https://git.kernel.org/stable/c/fd66854a22661929245f3d2b244c432bc8b1a150"
        },
        {
          "url": "https://git.kernel.org/stable/c/158f3cc332dc53f43ec20060233d7c3cecd6d912"
        },
        {
          "url": "https://git.kernel.org/stable/c/66700c0719675e0e118ae83b2d7168dacd69dd3d"
        },
        {
          "url": "https://git.kernel.org/stable/c/626bda8cfe43dff19a9833ff6ba055a817b5455c"
        },
        {
          "url": "https://git.kernel.org/stable/c/be6aae9d1b91c603adb35872d37d40e83daf8758"
        },
        {
          "url": "https://git.kernel.org/stable/c/a50e73488e0bbdd262b3be3c9a1d8dd078382381"
        },
        {
          "url": "https://git.kernel.org/stable/c/f8d5e7846025f4ab15a461235f8ebae9094a361a"
        }
      ],
      "title": "sctp: avoid auth_enable sysctl UAF during netns teardown",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-68162",
    "datePublished": "2026-08-10T11:59:29.099Z",
    "dateReserved": "2026-07-30T09:28:09.372Z",
    "dateUpdated": "2026-08-23T12:46:01.222Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

Sightings

Author	Source	Type	Date	Other

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.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
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EUVD-2026-357843

CVE-2026-68162 (GCVE-0-2026-68162)

Tags

Sightings

Nomenclature

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