CVE-2026-46181 Details
Description
In the Linux kernel, the following vulnerability has been resolved: RDMA/mlx4: Fix mis-use of RCU in mlx4_srq_event() Sashiko points out the radix_tree itself is RCU safe, but nothing ever frees the mlx4_srq struct with RCU, and it isn't even accessed within the RCU critical section. It also will crash if an event is delivered before the srq object is finished initializing. Use the spinlock since it isn't easy to make RCU work, use refcount_inc_not_zero() to protect against partially initialized objects, and order the refcount_set() to be after the srq is fully initialized.
A vulnerability has been identified in the Linux kernel's RDMA mlx4 component, specifically in the handling of shared receive queue (SRQ) events. This issue arises from a misuse of Read-Copy Update (RCU) mechanisms, which can lead to crashes if events are delivered before the SRQ object is fully initialized. The vulnerability exists because the mlx4_srq structure is not properly freed or accessed within RCU critical sections, despite the radix tree lookup being RCU-safe. The problem can be exploited by delivering an event to an SRQ that has not completed its initialization process.
The vulnerability has been addressed in the Linux kernel. Users can upgrade to the latest version available in the Linux kernel stable tree to apply the fix.
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.
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Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| NVD-CWE-noinfo | Insufficient Information to Classify Weakness | [email protected] |
| CWE-366 | Race Condition within a Thread | redhat-SADP |
Affected Products
| Product | Versions |
|---|---|
| linux linux kernel | >= 4.9, < 6.18.30 >= 6.19, < 7.0.7 7.1 rc1 7.1 rc2 |
CPE
Remediation
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Change History
12 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Jul 20, 2026 | CVE Modified | redhat-SADP |
| Jul 15, 2026 | CVE Modified | redhat-SADP |
| Jul 8, 2026 | CVE Modified | redhat-SADP |
| Jul 7, 2026 | CVE Modified | redhat-SADP |
| Jul 6, 2026 | CVE Modified | redhat-SADP |
| Jul 2, 2026 | CVE Modified | redhat-SADP |
| Jul 1, 2026 | CVE Modified | redhat-SADP |
| Jun 30, 2026 | CVE Modified | redhat-SADP |
| Jun 17, 2026 | CVE Modified | kernel.org |
| Jun 11, 2026 | Initial Analysis | [email protected] |
| May 30, 2026 | CVE Modified | kernel.org |
| May 28, 2026 | New CVE Received | kernel.org |