CVE-2026-46252 regulator: core: fix locking in regulator_resolve_supply() error path
A locking error in the Linux kernel regulator core can cause a lockdep warning and potential system instability during supply resolution failures.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-46252?
CVE-2026-46252 is a medium-severity vulnerability in Linux kernel, published on 3 Jun 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
In the Linux kernel, the following vulnerability has been resolved:
regulator: core: fix locking in regulator_resolve_supply() error path
If late enabling of a supply regulator fails in regulator_resolve_supply(), the code currently triggers a lockdep warning:
WARNING: drivers/regulator/core.c:2649 at _regulator_put+0x80/0xa0, CPU#6: kworker/u32:4/596 ... Call trace: _regulator_put+0x80/0xa0 (P) regulator_resolve_supply+0x7cc/0xbe0 regulator_register_resolve_supply+0x28/0xb8
as the regulator_list_mutex must be held when calling _regulator_put().
To solve this, simply switch to using regulator_put().
While at it, we should also make sure that no concurrent access happens to our rdev while we clear out the supply pointer. Add appropriate locking to ensure that.
While the code in question will be removed altogether in a follow-up commit, I believe it is still beneficial to have this corrected before removal for future reference.
Weakness: CWE-667
Which versions are affected by CVE-2026-46252?
It affects 1 product.
Products include Linux kernel.
How do I fix CVE-2026-46252?
Apply the vendor's patch.
Is CVE-2026-46252 being exploited?
There is no known exploitation of CVE-2026-46252 in the wild and no public exploit code.
Other vulnerabilities in Linux kernel
Sources
Also known as AZL-89354, BELL-CVE-2026-46252, DEBIAN-CVE-2026-46252, GHSA-w447-hxj8-xq6p, ROOT-OS-DEBIAN-11-CVE-2026-46252, ROOT-OS-DEBIAN-12-CVE-2026-46252 and 4 more.