Linux Kernel: Devlink Relation Release Leak in devlink_free()
CVE-2026-53261 Published on June 25, 2026
devlink: Release nested relation on devlink free
In the Linux kernel, the following vulnerability has been resolved:
devlink: Release nested relation on devlink free
devlink relation state is normally released from devl_unregister(), which
calls devlink_rel_put(). This misses devlink instances that get a nested
relation before registration and then fail probe before devl_register() is
reached.
That flow can happen for SFs. The child devlink gets linked to its
parent before registration, then a later probe error calls devlink_free()
directly. Since the instance was never registered, devl_unregister() is not
called and devlink->rel is leaked.
Release any pending relation from devlink_free() as well. The registered
path is unchanged because devl_unregister() already clears devlink->rel
before devlink_free() runs.
Products Associated with CVE-2026-53261
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Affected Versions
Linux:- Version c137743bce02b18c1537d4681aa515f7b80bf0a8 and below a9137286884703113b1c9e6403bd6d7d97b14754 is affected.
- Version c137743bce02b18c1537d4681aa515f7b80bf0a8 and below 927f96861f939c0b517d13ed27bf4fabbfc1cfb3 is affected.
- Version c137743bce02b18c1537d4681aa515f7b80bf0a8 and below 11324d52b0c63f4f202b35793c6507a575e9a689 is affected.
- Version c137743bce02b18c1537d4681aa515f7b80bf0a8 and below 3522b21fd7e1863d0734537737bd59f1b90d0190 is affected.
- Version 6.7 is affected.
- Before 6.7 is unaffected.
- Version 6.12.94, <= 6.12.* is unaffected.
- Version 6.18.36, <= 6.18.* is unaffected.
- Version 7.0.13, <= 7.0.* is unaffected.
- Version 7.1, <= * is unaffected.