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CVE PROGRAM SOURCE RECORDUnscored

CVE-2026-43115

srcu: Use irq_work to start GP in tiny SRCU

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Status
Published
Published
Updated
Assigning organization
Linux

Description

In the Linux kernel, the following vulnerability has been resolved: srcu: Use irq_work to start GP in tiny SRCU Tiny SRCU's srcu_gp_start_if_needed() directly calls schedule_work(), which acquires the workqueue pool->lock. This causes a lockdep splat when call_srcu() is called with a scheduler lock held, due to: call_srcu() [holding pi_lock] srcu_gp_start_if_needed() schedule_work() -> pool->lock workqueue_init() / create_worker() [holding pool->lock] wake_up_process() -> try_to_wake_up() -> pi_lock Also add irq_work_sync() to cleanup_srcu_struct() to prevent a use-after-free if a queued irq_work fires after cleanup begins. Tested with rcutorture SRCU-T and no lockdep warnings. [ Thanks to Boqun for similar fix in patch "rcu: Use an intermediate irq_work to start process_srcu()" ]

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

  • d8be81735aa89413b333de488251f0e64e2be591 to < 20b98d9ffb09763048a7c84b47403eb0f177272caffected
  • d8be81735aa89413b333de488251f0e64e2be591 to < 2127e6b79d9d579ea538a350d1bbe859e39814d5affected
  • d8be81735aa89413b333de488251f0e64e2be591 to < 28768bc7ea0b13f558a70f63cc3cfcd32d55d488affected
  • d8be81735aa89413b333de488251f0e64e2be591 to < bb37286db65368cb72ba8757ad86299c4e4a73fcaffected
  • d8be81735aa89413b333de488251f0e64e2be591 to < a6fc88b22bc8d12ad52e8412c667ec0f5bf055afaffected

Linux Linux

Default version status: affected

  • 4.12affected
  • 0 to < 4.12unaffected
  • 6.6.160 to ≤ 6.6.*unaffected
  • 6.12.114 to ≤ 6.12.*unaffected
  • 6.18.57 to ≤ 6.18.*unaffected
  • 6.19.14 to ≤ 6.19.*unaffected
  • 7.0 to ≤ *unaffected

References