CVE-2026-72314
In the Linux kernel, the following vulnerability has been resolved: regulator: core: regulator_lock_two() should test for EDEADLK not EDEADLOCK Compare against -EDEADLK, which is what ww_mutex_lock() actually returns and what every other deadlock check…
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (0.18%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
Description
In the Linux kernel, the following vulnerability has been resolved: regulator: core: regulator_lock_two() should test for EDEADLK not EDEADLOCK Compare against -EDEADLK, which is what ww_mutex_lock() actually returns and what every other deadlock check in this file already uses. Function regulator_lock_two() acquires two regulators via regulator_lock_nested() -> ww_mutex_lock(). On contention, ww_mutex_lock() returns -EDEADLK, which is the caller's signal to drop the lock it holds and retry the acquisition in the canonical order. However, regulator_lock_two() tests the return value against -EDEADLOCK rather than -EDEADLK. On most architectures, EDEADLK and EDEADLOCK are the same value, so the comparison happens to be correct and the bug is invisible. But on MIPS, SPARC, and PowerPC, those two errors have different values. The test is wrong: a genuine -EDEADLK backoff no longer matches -EDEADLOCK, so instead of unlocking and retrying, the code falls into WARN_ON(ret) and returns with only one of the two regulators locked. In practice, this is a bug only on MIPS, because the regulator core is not built or used on the other two platforms. In general, EDEADLK is preferred over EDEADLOCK for new code.
- CVSS 3.1
- 7.8 HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- EPSS
- 0.18% probability · 7th percentile
- CISA KEV
- Not listed
- Source
- 416baaa9-dc9f-4396-8d5f-8c081fb06d67
References
- https://git.kernel.org/stable/c/0c305eac40470a224671858a215963b070f9b2a9
- https://git.kernel.org/stable/c/153d1b8b5bc30847eb70ad535f62f289aa9217e6
- https://git.kernel.org/stable/c/29a7953e9adea6c7f9e64947745b79158e7cea7f
- https://git.kernel.org/stable/c/346e2d666a29ae7233c56b356a0487eb1d42589b
- https://git.kernel.org/stable/c/8e39aa63798ea0a797fd9341419f12ef91df3238
- https://git.kernel.org/stable/c/d38f8bd771c4999b797d7074b348cf201414bd34
- https://git.kernel.org/stable/c/dc804f390fddd9c389edf0976356942e16878d8f
- https://git.kernel.org/stable/c/e2063307ea3b6da74585129ba7b588e8243e2ef0
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.