CVE-2026-43115 Details
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()" ]
A vulnerability in the Linux kernel's Tiny SRCU (Synchronize Read Copy Update) implementation has been addressed. The issue arose because the function responsible for starting grace periods in Tiny SRCU directly invoked 'schedule_work()', which locked the workqueue pool. This created a conflict when 'call_srcu()' was used while holding a scheduler lock, leading to a lock dependency warning. The problem was resolved by modifying the grace period initiation to use 'irq_work', which avoids the scheduler lock conflict. Additionally, 'irq_work_sync()' was added to the cleanup process to prevent a use-after-free error if a queued interrupt work item was processed after the cleanup started.
Users can upgrade to the latest version of the Linux kernel where this vulnerability has been fixed. Instructions for downloading the patched version are available on the Linux kernel official website.
Metrics
CVSS 4.0 Severity and Vector Strings:
No CVSS 4.0 data is available for this CVE.
CVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
No SSVC data is available for this CVE.
References to Advisories, Solutions, and Tools
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| URL | Source(s) | Tag(s) |
|---|---|---|
| https://git.kernel.org/stable/c/a6fc88b22bc8d12ad52e8412c667ec0f5bf055af | kernel.org | Patch |
| https://git.kernel.org/stable/c/bb37286db65368cb72ba8757ad86299c4e4a73fc | kernel.org | Patch |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| NVD-CWE-noinfo | Insufficient Information to Classify Weakness | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| linux linux kernel | >= 4.12, < 6.19.14 7.0 rc1 7.0 rc2 7.0 rc3 7.0 rc4 7.0 rc5 |
CPE
Remediation
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Change History
3 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Jun 17, 2026 | CVE Modified | kernel.org |
| May 8, 2026 | Initial Analysis | [email protected] |
| May 6, 2026 | New CVE Received | kernel.org |