GHSA-F75F-9MXV-WJHQ
Vulnerability from github – Published: 2026-08-10 15:33 – Updated: 2026-08-23 15:32In 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.
{
"affected": [],
"aliases": [
"CVE-2026-68162"
],
"database_specific": {
"cwe_ids": [],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2026-08-10T13:20:02Z",
"severity": "HIGH"
},
"details": "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.",
"id": "GHSA-f75f-9mxv-wjhq",
"modified": "2026-08-23T15:32:57Z",
"published": "2026-08-10T15:33:38Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-68162"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/158f3cc332dc53f43ec20060233d7c3cecd6d912"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/19573dcddb8819fd68d6cd1f916c1c99c3fa4ff4"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/626bda8cfe43dff19a9833ff6ba055a817b5455c"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/66700c0719675e0e118ae83b2d7168dacd69dd3d"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/a50e73488e0bbdd262b3be3c9a1d8dd078382381"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/be6aae9d1b91c603adb35872d37d40e83daf8758"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/ceb7190b5c873d4a1267a1600c5aa52c600e929f"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/f8d5e7846025f4ab15a461235f8ebae9094a361a"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/fd66854a22661929245f3d2b244c432bc8b1a150"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
"type": "CVSS_V3"
}
]
}
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