High 7.8Published Aug 10, 2026

CVE-2026-68162sctp: avoid auth_enable sysctl UAF during netns teardown

Updated under an hour ago (Oct 26, 2026, 6:40 PM ET)

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Exploited in the last 30 days

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.

CVSS: 7.8 HIGH (v3.1, CNA)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Weakness (CWE): CWE-416
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: Linux
NVD analysis: Received
Record last updated: Oct 19, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

Linux Linux linux:linux (from the name)	from 10c869a52f266e40f548cc3c565d14930a5edafc before 19573dcddb8819fd68d6cd1f916c1c99c3fa4ff4; from dc583e7e5f8515ca489c0df28e4362a70eade382 before ceb7190b5c873d4a1267a1600c5aa52c600e929f; from bd2a2939423566c654545fa3e96a656662a0af9e before fd66854a22661929245f3d2b244c432bc8b1a150; from 1b67030d39f2b00f94ac1f0af11ba6657589e4d3 before 158f3cc332dc53f43ec20060233d7c3cecd6d912; from 7ec30c54f339c640aa7e49d7e9f7bbed6bd42bf6 before 66700c0719675e0e118ae83b2d7168dacd69dd3d; from c184bc621e3cef03ac9ba81a50dda2dae6a21d36 before 626bda8cfe43dff19a9833ff6ba055a817b5455c; from 15649fd5415eda664ef35780c2013adeb5d9c695 before be6aae9d1b91c603adb35872d37d40e83daf8758; from 15649fd5415eda664ef35780c2013adeb5d9c695 before a50e73488e0bbdd262b3be3c9a1d8dd078382381; and 7 more ranges	CNA record

References

References

https://git.kernel.org/stable/c/19573dcddb8819fd68d6cd1f916c1c99c3fa4ff4
https://git.kernel.org/stable/c/ceb7190b5c873d4a1267a1600c5aa52c600e929f
https://git.kernel.org/stable/c/fd66854a22661929245f3d2b244c432bc8b1a150
https://git.kernel.org/stable/c/158f3cc332dc53f43ec20060233d7c3cecd6d912
https://git.kernel.org/stable/c/66700c0719675e0e118ae83b2d7168dacd69dd3d
https://git.kernel.org/stable/c/626bda8cfe43dff19a9833ff6ba055a817b5455c
https://git.kernel.org/stable/c/be6aae9d1b91c603adb35872d37d40e83daf8758
https://git.kernel.org/stable/c/a50e73488e0bbdd262b3be3c9a1d8dd078382381
https://git.kernel.org/stable/c/f8d5e7846025f4ab15a461235f8ebae9094a361a

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.