sctp: avoid auth_enable sysctl UAF during netns teardown

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-68162
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-08-10 13:20:02 UTC
Updated2026-08-10 13:20:02 UTC
DescriptionIn 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.

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 10c869a52f266e40f548cc3c565d14930a5edafc 19573dcddb8819fd68d6cd1f916c1c99c3fa4ff4 git Not specified
CNA Linux Linux affected 7ec30c54f339c640aa7e49d7e9f7bbed6bd42bf6 66700c0719675e0e118ae83b2d7168dacd69dd3d git Not specified
CNA Linux Linux affected c184bc621e3cef03ac9ba81a50dda2dae6a21d36 626bda8cfe43dff19a9833ff6ba055a817b5455c git Not specified
CNA Linux Linux affected 15649fd5415eda664ef35780c2013adeb5d9c695 be6aae9d1b91c603adb35872d37d40e83daf8758 git Not specified
CNA Linux Linux affected 15649fd5415eda664ef35780c2013adeb5d9c695 a50e73488e0bbdd262b3be3c9a1d8dd078382381 git Not specified
CNA Linux Linux affected 15649fd5415eda664ef35780c2013adeb5d9c695 f8d5e7846025f4ab15a461235f8ebae9094a361a git Not specified
CNA Linux Linux affected dc583e7e5f8515ca489c0df28e4362a70eade382 git Not specified
CNA Linux Linux affected bd2a2939423566c654545fa3e96a656662a0af9e git Not specified
CNA Linux Linux affected 1b67030d39f2b00f94ac1f0af11ba6657589e4d3 git Not specified
CNA Linux Linux affected 5.4.290 5.4.292 semver Not specified
CNA Linux Linux affected 6.6.72 6.6.151 semver Not specified
CNA Linux Linux affected 6.12.10 6.12.101 semver Not specified
CNA Linux Linux affected 5.10.234 5.11 semver Not specified
CNA Linux Linux affected 5.15.177 5.16 semver Not specified
CNA Linux Linux affected 6.1.125 6.2 semver Not specified
CNA Linux Linux affected 6.13 Not specified
CNA Linux Linux unaffected 6.13 semver Not specified
CNA Linux Linux unaffected 5.4.292 5.4.* semver Not specified
CNA Linux Linux unaffected 6.6.151 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.101 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.42 6.18.* semver Not specified
CNA Linux Linux unaffected 7.1.6 7.1.* semver Not specified
CNA Linux Linux unaffected 7.2-rc5 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/be6aae9d1b91c603adb35872d37d40e83daf8758 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/626bda8cfe43dff19a9833ff6ba055a817b5455c 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/19573dcddb8819fd68d6cd1f916c1c99c3fa4ff4 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/66700c0719675e0e118ae83b2d7168dacd69dd3d 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/a50e73488e0bbdd262b3be3c9a1d8dd078382381 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/f8d5e7846025f4ab15a461235f8ebae9094a361a 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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