OPP: Fix race between OPP addition and lookup

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Summary

CVECVE-2026-74405
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-08-15 06:22:42 UTC
Updated2026-08-15 06:22:42 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: OPP: Fix race between OPP addition and lookup A race exists between dev_pm_opp_add_dynamic() and dev_pm_opp_find_freq_exact(): CPU0 (add) CPU1 (lookup) ------------------------------- ------------------------------ _opp_add() mutex_lock() list_add(&new_opp->node, head) mutex_unlock() _opp_table_find_key() mutex_lock() dev_pm_opp_get(opp) kref_get() mutex_unlock() kref_init(&new_opp->kref) dev_pm_opp_put() kref_put_mutex() The newly added OPP is inserted into the list before its kref is initialized. A concurrent lookup can find this OPP and increment its reference count while it is still uninitialized, leading to refcount corruption and a potential premature free. Fix this by initializing ->kref and ->opp_table before making the OPP visible via list_add(). This ensures any concurrent lookup observes a fully initialized object. [ Viresh: Updated commit log ]

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 7034764a1e4a6edbb60914e89aad8384e3fe5d17 46696b0b2123475d7f95909435c09808fc5ffd23 git Not specified
CNA Linux Linux affected 7034764a1e4a6edbb60914e89aad8384e3fe5d17 bb75bd7d9ae7672034f73ce67a57e6ac89bb39e5 git Not specified
CNA Linux Linux affected 7034764a1e4a6edbb60914e89aad8384e3fe5d17 f5e1cc9a284bff2510981643a5bca4bc4c21b81a git Not specified
CNA Linux Linux affected 4.11 Not specified
CNA Linux Linux unaffected 4.11 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-rc1 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/f5e1cc9a284bff2510981643a5bca4bc4c21b81a 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/bb75bd7d9ae7672034f73ce67a57e6ac89bb39e5 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/46696b0b2123475d7f95909435c09808fc5ffd23 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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