smb/server: abort initialization when proc setup fails

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-90164
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-17 17:17:09 UTC
Updated2026-09-17 17:17:09 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: smb/server: abort initialization when proc setup fails ksmbd_server_init() calls ksmbd_proc_init() before creating the remaining proc entries and server subsystems. ksmbd_proc_init() tears down partial state on a procfs or percpu_counter allocation failure, but returns void, so ksmbd_server_init() continues as if the counters were usable. Once userspace starts the server, server_ctrl_handle_init() calls ksmbd_proc_reset(), which reaches percpu_counter_set() with a NULL per-CPU counters pointer on SMP systems. The later ksmbd_proc_create() calls also receive a NULL parent and may create entries in the /proc root; ksmbd_proc_cleanup() cannot remove those entries because ksmbd_proc_fs is NULL.

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected b38f99c1217ae04753340f0fdcd8f35bf56841dc fb4ba2bdfc1de8866e7c8e00df99f4b03ff42f09 git Not specified
CNA Linux Linux affected b38f99c1217ae04753340f0fdcd8f35bf56841dc db97f3763727d652112ae70038d4e17b3ce277bb git Not specified
CNA Linux Linux affected 7.0 Not specified
CNA Linux Linux unaffected 7.0 semver Not specified
CNA Linux Linux unaffected 7.2.6 7.2.* semver Not specified
CNA Linux Linux unaffected 7.3-rc1 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/fb4ba2bdfc1de8866e7c8e00df99f4b03ff42f09 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/db97f3763727d652112ae70038d4e17b3ce277bb 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

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