CVE-2026-68162: In the Linux kernel, the following vulnerability has been resolved: sctp: avoid auth_enable sysctl UAF during netns teardown proc_sctp_do_auth() upd...

Description

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.

Affected Software

Source: CNA advisory (CVE.org). NVD analysis pending.

Vendor	Product	Versions
Linux	Linux	>= 10c869a52f266e40f548cc3c565d14930a5edafc, < 19573dcddb8819fd68d6cd1f916c1c99c3fa4ff4; >= 7ec30c54f339c640aa7e49d7e9f7bbed6bd42bf6, < 66700c0719675e0e118ae83b2d7168dacd69dd3d; >= c184bc621e3cef03ac9ba81a50dda2dae6a21d36, < 626bda8cfe43dff19a9833ff6ba055a817b5455c; >= 15649fd5415eda664ef35780c2013adeb5d9c695, < be6aae9d1b91c603adb35872d37d40e83daf8758; >= 15649fd5415eda664ef35780c2013adeb5d9c695, < a50e73488e0bbdd262b3be3c9a1d8dd078382381; >= 15649fd5415eda664ef35780c2013adeb5d9c695, < f8d5e7846025f4ab15a461235f8ebae9094a361a; dc583e7e5f8515ca489c0df28e4362a70eade382; bd2a2939423566c654545fa3e96a656662a0af9e; 1b67030d39f2b00f94ac1f0af11ba6657589e4d3; >= 5.4.290, < 5.4.292; >= 6.6.72, < 6.6.151; >= 6.12.10, < 6.12.101; >= 5.10.234, < 5.11; >= 5.15.177, < 5.16; >= 6.1.125, < 6.2
Linux	Linux	6.13

References

Timeline

Published: Aug 10, 2026
Last Modified: Aug 10, 2026
Status: Received

Frequently Asked Questions

What is CVE-2026-68162?

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.

How severe is CVE-2026-68162?

Severity scoring for CVE-2026-68162 is pending analysis.

How do I fix CVE-2026-68162?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

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