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CVE PROGRAM SOURCE RECORD7.8 High

CVE-2026-72314

regulator: core: regulator_lock_two() should test for EDEADLK not EDEADLOCK

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Status
Published
Published
Updated
Assigning organization
Linux

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.

Affected products

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

Linux Linux

Default version status: unaffected

  • 06140d6dfe720d80566f792b4e28a9cd60a67970 to < dc804f390fddd9c389edf0976356942e16878d8faffected
  • 1e3056b8067c2e9b7741c4e588f0acacbe4bdafc to < 8e39aa63798ea0a797fd9341419f12ef91df3238affected
  • 849ab4cf182b38e562ffcc1b494d510e948822dd to < 0c305eac40470a224671858a215963b070f9b2a9affected
  • cba6cfdc7c3f1516f0d08ddfb24e689af0932573 to < 29a7953e9adea6c7f9e64947745b79158e7cea7faffected
  • cba6cfdc7c3f1516f0d08ddfb24e689af0932573 to < e2063307ea3b6da74585129ba7b588e8243e2ef0affected
  • cba6cfdc7c3f1516f0d08ddfb24e689af0932573 to < 346e2d666a29ae7233c56b356a0487eb1d42589baffected
  • cba6cfdc7c3f1516f0d08ddfb24e689af0932573 to < 153d1b8b5bc30847eb70ad535f62f289aa9217e6affected
  • cba6cfdc7c3f1516f0d08ddfb24e689af0932573 to < d38f8bd771c4999b797d7074b348cf201414bd34affected
  • 5224ea575196db11c0a909a78ea426ccdb92f064affected
  • 435c65af581a61ca249bd8f717c3a147dc119f11affected
  • cdc042430ea9e07f77ce05a9d29e227dbdecc733affected
  • 5.10.180 to < 5.10.261affected
  • 5.15.111 to < 5.15.212affected
  • 6.1.28 to < 6.1.178affected
  • 5.4.243 to < 5.5affected
  • 6.2.15 to < 6.3affected
  • 6.3.2 to < 6.4affected

Linux Linux

Default version status: affected

  • 6.4affected
  • 0 to < 6.4unaffected
  • 5.10.261 to ≤ 5.10.*unaffected
  • 5.15.212 to ≤ 5.15.*unaffected
  • 6.1.178 to ≤ 6.1.*unaffected
  • 6.6.145 to ≤ 6.6.*unaffected
  • 6.12.97 to ≤ 6.12.*unaffected
  • 6.18.40 to ≤ 6.18.*unaffected
  • 7.1.5 to ≤ 7.1.*unaffected
  • 7.2 to ≤ *unaffected

References