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

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-72314
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-08-15 06:22:04 UTC
Updated2026-08-17 06:18:34 UTC
DescriptionIn 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.

Risk And Classification

Primary CVSS: v3.1 7.8 HIGH from 416baaa9-dc9f-4396-8d5f-8c081fb06d67

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

EPSS: 0.001760000 probability, percentile 0.074000000 (date 2026-08-17)

VersionSourceTypeScoreSeverityVector
3.1416baaa9-dc9f-4396-8d5f-8c081fb06d67Secondary7.8HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
3.1CNADECLARED7.8HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CVSS v3.1 Breakdown

Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 06140d6dfe720d80566f792b4e28a9cd60a67970 dc804f390fddd9c389edf0976356942e16878d8f git Not specified
CNA Linux Linux affected 1e3056b8067c2e9b7741c4e588f0acacbe4bdafc 8e39aa63798ea0a797fd9341419f12ef91df3238 git Not specified
CNA Linux Linux affected 849ab4cf182b38e562ffcc1b494d510e948822dd 0c305eac40470a224671858a215963b070f9b2a9 git Not specified
CNA Linux Linux affected cba6cfdc7c3f1516f0d08ddfb24e689af0932573 29a7953e9adea6c7f9e64947745b79158e7cea7f git Not specified
CNA Linux Linux affected cba6cfdc7c3f1516f0d08ddfb24e689af0932573 e2063307ea3b6da74585129ba7b588e8243e2ef0 git Not specified
CNA Linux Linux affected cba6cfdc7c3f1516f0d08ddfb24e689af0932573 346e2d666a29ae7233c56b356a0487eb1d42589b git Not specified
CNA Linux Linux affected cba6cfdc7c3f1516f0d08ddfb24e689af0932573 153d1b8b5bc30847eb70ad535f62f289aa9217e6 git Not specified
CNA Linux Linux affected cba6cfdc7c3f1516f0d08ddfb24e689af0932573 d38f8bd771c4999b797d7074b348cf201414bd34 git Not specified
CNA Linux Linux affected 5224ea575196db11c0a909a78ea426ccdb92f064 git Not specified
CNA Linux Linux affected 435c65af581a61ca249bd8f717c3a147dc119f11 git Not specified
CNA Linux Linux affected cdc042430ea9e07f77ce05a9d29e227dbdecc733 git Not specified
CNA Linux Linux affected 5.10.180 5.10.261 semver Not specified
CNA Linux Linux affected 5.15.111 5.15.212 semver Not specified
CNA Linux Linux affected 6.1.28 6.1.178 semver Not specified
CNA Linux Linux affected 5.4.243 5.5 semver Not specified
CNA Linux Linux affected 6.2.15 6.3 semver Not specified
CNA Linux Linux affected 6.3.2 6.4 semver Not specified
CNA Linux Linux affected 6.4 Not specified
CNA Linux Linux unaffected 6.4 semver Not specified
CNA Linux Linux unaffected 5.10.261 5.10.* semver Not specified
CNA Linux Linux unaffected 5.15.212 5.15.* semver Not specified
CNA Linux Linux unaffected 6.1.178 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.145 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.97 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.40 6.18.* semver Not specified
CNA Linux Linux unaffected 7.1.5 7.1.* semver Not specified
CNA Linux Linux unaffected 7.2 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/d38f8bd771c4999b797d7074b348cf201414bd34 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/346e2d666a29ae7233c56b356a0487eb1d42589b 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/29a7953e9adea6c7f9e64947745b79158e7cea7f 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/8e39aa63798ea0a797fd9341419f12ef91df3238 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/e2063307ea3b6da74585129ba7b588e8243e2ef0 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/153d1b8b5bc30847eb70ad535f62f289aa9217e6 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/0c305eac40470a224671858a215963b070f9b2a9 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/dc804f390fddd9c389edf0976356942e16878d8f 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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