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Review reviewHigh

CVE-2026-46181

Linux Linux, Red Hat Enterprise Linux 7 Extended Lifecycle Support, Red Hat Enterprise Linux 8

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.

CVSS
7.8
EPSS
0.11%
1.69% percentile
CISA KEV
Not listed
Published
2026.05.28
PRIORITY ASSESSMENT

Review review

The CVSS severity warrants an early asset and exposure review.

Known exploitationNot established by KEV
Exploit probability0.11%
Technical severityCVSS 7.8

Vulnerability overview

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.

Affected product and versions

Product
Linux Linux, Red Hat Enterprise Linux 7 Extended Lifecycle Support, Red Hat Enterprise Linux 8
Affected versions
>= 30353bfc43a1602c020f31d95cf27182ffd23824 < 1e2a44875b6afb4add1115f7f3351dcbeb6f273d, >= 30353bfc43a1602c020f31d95cf27182ffd23824 < 8b7833f3bce35cb0d01c1503781523c099c675f0, >= 30353bfc43a1602c020f31d95cf27182ffd23824 < c9341307ea16b9395c2e4c9c94d8499d91fe31d0, >= 4.9, >= 4.9 < 6.18.30, >= 6.19 < 7.0.7, 7.1
Fixed versions
6.18.30, 7.0.7

Recommended response sequence

Confirm exposure before applying a vendor-supported change.

Full remediation guide
  1. 1
    Identify

    Confirm that Linux Linux, Red Hat Enterprise Linux 7 Extended Lifecycle Support, Red Hat Enterprise Linux 8 and an affected version are present.

  2. 2
    Prioritize

    Combine exploitation signals with asset exposure and business criticality.

  3. 3
    Remediate

    Follow the vendor advisory or supported update path and preserve rollback options.

  4. 4
    Verify

    Recheck the version, service health, access paths, and relevant logs.

Technical data

CVSS vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CWE
CWE-366