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

Vulnerability from cvelistv5 – Published: 2026-08-10 11:59 – Updated: 2026-08-17 05:00
VLAI
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
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 10c869a52f266e40f548cc3c565d14930a5edafc , < 19573dcddb8819fd68d6cd1f916c1c99c3fa4ff4 (git)
Affected: 7ec30c54f339c640aa7e49d7e9f7bbed6bd42bf6 , < 66700c0719675e0e118ae83b2d7168dacd69dd3d (git)
Affected: c184bc621e3cef03ac9ba81a50dda2dae6a21d36 , < 626bda8cfe43dff19a9833ff6ba055a817b5455c (git)
Affected: 15649fd5415eda664ef35780c2013adeb5d9c695 , < be6aae9d1b91c603adb35872d37d40e83daf8758 (git)
Affected: 15649fd5415eda664ef35780c2013adeb5d9c695 , < a50e73488e0bbdd262b3be3c9a1d8dd078382381 (git)
Affected: 15649fd5415eda664ef35780c2013adeb5d9c695 , < f8d5e7846025f4ab15a461235f8ebae9094a361a (git)
Affected: dc583e7e5f8515ca489c0df28e4362a70eade382 (git)
Affected: bd2a2939423566c654545fa3e96a656662a0af9e (git)
Affected: 1b67030d39f2b00f94ac1f0af11ba6657589e4d3 (git)
Affected: 5.4.290 , < 5.4.292 (semver)
Affected: 6.6.72 , < 6.6.151 (semver)
Affected: 6.12.10 , < 6.12.101 (semver)
Affected: 5.10.234 , < 5.11 (semver)
Affected: 5.15.177 , < 5.16 (semver)
Affected: 6.1.125 , < 6.2 (semver)
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Linux Linux Affected: 6.13
Unaffected: 0 , < 6.13 (semver)
Unaffected: 5.4.292 , ≤ 5.4.* (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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          "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."
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              "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."
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    "dateUpdated": "2026-08-17T05:00:00.299Z",
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      "date": "2026-08-20",
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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.\"}],\"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\":\"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\":\"dc583e7e5f8515ca489c0df28e4362a70eade382\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"bd2a2939423566c654545fa3e96a656662a0af9e\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"1b67030d39f2b00f94ac1f0af11ba6657589e4d3\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"5.4.290\",\"lessThan\":\"5.4.292\",\"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\"},{\"version\":\"5.10.234\",\"lessThan\":\"5.11\",\"versionType\":\"semver\",\"status\":\"affected\"},{\"version\":\"5.15.177\",\"lessThan\":\"5.16\",\"versionType\":\"semver\",\"status\":\"affected\"},{\"version\":\"6.1.125\",\"lessThan\":\"6.2\",\"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\":\"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}]},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/19573dcddb8819fd68d6cd1f916c1c99c3fa4ff4\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/626bda8cfe43dff19a9833ff6ba055a817b5455c\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/66700c0719675e0e118ae83b2d7168dacd69dd3d\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/a50e73488e0bbdd262b3be3c9a1d8dd078382381\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/be6aae9d1b91c603adb35872d37d40e83daf8758\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/f8d5e7846025f4ab15a461235f8ebae9094a361a\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}",
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-08-13T23:18:40+00:00",
      "cve": "CVE-2026-68162",
      "id": "CVE-2026-68162",
      "initial_release_date": "2026-08-10T00:00:00+00:00",
      "product_status:known_affected": "275",
      "product_status:known_not_affected": "1",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: sctp: avoid auth_enable sysctl UAF during netns teardown",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-68162.json",
      "version": "3"
    },
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      "aggregate_severity": "moderate",
      "current_release_date": "2026-08-13T16:24:00Z",
      "cve": "CVE-2026-68162",
      "id": "CVE-2026-68162",
      "initial_release_date": "2026-08-13T16:24:00Z",
      "product_status:known_affected": "292",
      "product_status:known_not_affected": "4",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-68162",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-68162.json",
      "version": "2"
    }
  }
}



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Tags
Taxonomy of the tags.





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

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.


Detection rules are retrieved from Rulezet.