CVE-2026-68162 (GCVE-0-2026-68162)
Vulnerability from cvelistv5
Published
2026-08-10 11:59
Modified
2026-10-19 20:58
Severity ?
7.8 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
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.
References
Impacted products
Vendor Product Version
Linux Linux Version: 10c869a52f266e40f548cc3c565d14930a5edafc
Version: dc583e7e5f8515ca489c0df28e4362a70eade382
Version: bd2a2939423566c654545fa3e96a656662a0af9e
Version: 1b67030d39f2b00f94ac1f0af11ba6657589e4d3
Version: 7ec30c54f339c640aa7e49d7e9f7bbed6bd42bf6
Version: c184bc621e3cef03ac9ba81a50dda2dae6a21d36
Version: 15649fd5415eda664ef35780c2013adeb5d9c695
Version: 15649fd5415eda664ef35780c2013adeb5d9c695
Version: 15649fd5415eda664ef35780c2013adeb5d9c695
Version: 5.4.290   ≤
Version: 5.10.234   ≤
Version: 5.15.177   ≤
Version: 6.1.125   ≤
Version: 6.6.72   ≤
Version: 6.12.10   ≤
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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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        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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        {
          "url": "https://git.kernel.org/stable/c/f8d5e7846025f4ab15a461235f8ebae9094a361a"
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      "title": "sctp: avoid auth_enable sysctl UAF during netns teardown",
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  "cveMetadata": {
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-68162",
    "datePublished": "2026-08-10T11:59:29.099Z",
    "dateReserved": "2026-07-30T09:28:09.372Z",
    "dateUpdated": "2026-10-19T20:58:55.689Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
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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, 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\"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\"}], \"programFiles\": [\"net/sctp/protocol.c\", \"net/sctp/sysctl.c\"], \"defaultStatus\": \"unaffected\"}, {\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"6.13\"}, {\"status\": \"unaffected\", \"version\": \"0\", \"lessThan\": \"6.13\", \"versionType\": \"semver\"}, {\"status\": \"unaffected\", \"version\": \"5.4.292\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.4.*\"}, {\"status\": \"unaffected\", \"version\": \"5.10.266\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.10.*\"}, {\"status\": \"unaffected\", \"version\": \"5.15.217\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.15.*\"}, {\"status\": \"unaffected\", \"version\": \"6.1.184\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.1.*\"}, {\"status\": \"unaffected\", \"version\": \"6.6.151\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.6.*\"}, {\"status\": \"unaffected\", \"version\": \"6.12.101\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.12.*\"}, {\"status\": \"unaffected\", \"version\": \"6.18.42\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.18.*\"}, {\"status\": \"unaffected\", \"version\": \"7.1.6\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"7.1.*\"}, {\"status\": \"unaffected\", \"version\": \"7.2\", \"versionType\": \"original_commit_for_fix\", \"lessThanOrEqual\": \"*\"}], \"programFiles\": [\"net/sctp/protocol.c\", \"net/sctp/sysctl.c\"], \"defaultStatus\": \"affected\"}], \"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\"}], \"x_generator\": {\"engine\": \"bippy-1.2.0\"}, \"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.\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.4.292\", \"versionStartIncluding\": \"5.4.290\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.10.266\", \"versionStartIncluding\": \"5.10.234\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.15.217\", \"versionStartIncluding\": \"5.15.177\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.1.184\", \"versionStartIncluding\": \"6.1.125\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.6.151\", \"versionStartIncluding\": \"6.6.72\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.12.101\", \"versionStartIncluding\": \"6.12.10\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.18.42\", \"versionStartIncluding\": \"6.13\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"7.1.6\", \"versionStartIncluding\": \"6.13\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"7.2\", \"versionStartIncluding\": \"6.13\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2026-08-23T12:46:01.222Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2026-68162\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-10-19T20:58:55.689Z\", \"dateReserved\": \"2026-07-30T09:28:09.372Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2026-08-10T11:59:29.099Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}


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