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 flaw was found in the Linux kernel's RDMA/mlx4 component. This vulnerability arises from the incorrect use of Read-Copy Update (RCU) in the `mlx4_srq_event()` function. An attacker could potentially trigger an event before the `srq` object is fully initialized, leading to a system crash. This could result in a Denial of Service (DoS) for the affected system.

Red Hat Enterprise Linux 7 Extended Lifecycle Support 2026-07-17T00:00:00Z RHSA-2026:41236 kernel-rt-0:3.10.0-1160.155.1.rt56.1307.el7 Red Hat Enterprise Linux 7 Extended Lifecycle Support 2026-07-07T00:00:00Z RHSA-2026:36216 kernel-0:3.10.0-1160.155.1.el7 Red Hat Enterprise Linux 8 2026-06-10T00:00:00Z RHSA-2026:25120 kernel-rt-0:4.18.0-553.132.1.rt7.473.el8_10 Red Hat Enterprise Linux 8 2026-06-10T00:00:00Z RHSA-2026:25121 kernel-0:4.18.0-553.132.1.el8_10 Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support 2026-07-06T00:00:00Z RHSA-2026:35896 kernel-0:4.18.0-305.197.1.el8_4 Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On 2026-07-06T00:00:00Z RHSA-2026:35896 kernel-0:4.18.0-305.197.1.el8_4 Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support 2026-07-06T00:00:00Z RHSA-2026:35894 kernel-0:4.18.0-372.199.1.el8_6 Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On 2026-07-06T00:00:00Z RHSA-2026:35894 kernel-0:4.18.0-372.199.1.el8_6 Red Hat Enterprise Linux 8.8 Telecommunications Update Service 2026-07-06T00:00:00Z RHSA-2026:35863 kernel-0:4.18.0-477.150.1.el8_8 Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions 2026-07-06T00:00:00Z RHSA-2026:35863 kernel-0:4.18.0-477.150.1.el8_8 Red Hat Enterprise Linux 9 2026-06-11T00:00:00Z RHSA-2026:25217 kernel-0:5.14.0-687.15.1.el9_8 Red Hat Enterprise Linux 9 2026-06-11T00:00:00Z RHSA-2026:25217 kernel-0:5.14.0-687.15.1.el9_8 Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions 2026-07-01T00:00:00Z RHSA-2026:34095 kernel-0:5.14.0-284.178.1.el9_2 Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions 2026-07-01T00:00:00Z RHSA-2026:33900 kernel-rt-0:5.14.0-284.178.1.rt14.463.el9_2 Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions 2026-07-01T00:00:00Z RHSA-2026:34443 kernel-0:5.14.0-427.135.1.el9_4 Red Hat Enterprise Linux 9.6 Extended Update Support 2026-07-01T00:00:00Z RHSA-2026:34094 kernel-0:5.14.0-570.125.1.el9_6 Red Hat Enterprise Linux 10 Not affected kernel Red Hat Enterprise Linux 6 Under investigation kernel Red Hat Enterprise Linux 9 Affected kernel-rt https://www.cve.org/CVERecord?id=CVE-2026-46181 https://nvd.nist.gov/vuln/detail/CVE-2026-46181 https://lore.kernel.org/linux-cve-announce/2026052829-CVE-2026-46181-ecff@gregkh/T