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.
Metrics
CVSS 3.1 7.8/10
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:HWeakness enumeration
Affected software
| Vendor | Product | Versions |
|---|---|---|
| Linux | Linux | >= 30353bfc43a1602c020f31d95cf27182ffd23824, < 654aeddbc6e0f6e56531985bb12328ab4230c6c1; >= 30353bfc43a1602c020f31d95cf27182ffd23824, < 2d8b30b496bc53e961ba7415fd629fc27813017c; >= 30353bfc43a1602c020f31d95cf27182ffd23824, < f0dbd9355ce1e93808541260c7ffab7956df9233; >= 30353bfc43a1602c020f31d95cf27182ffd23824, < 1e2a44875b6afb4add1115f7f3351dcbeb6f273d; >= 30353bfc43a1602c020f31d95cf27182ffd23824, < 8b7833f3bce35cb0d01c1503781523c099c675f0; >= 30353bfc43a1602c020f31d95cf27182ffd23824, < c9341307ea16b9395c2e4c9c94d8499d91fe31d0 |
| Linux | Linux | 4.9 |
| Red Hat | Red Hat Enterprise Linux 7 Extended Lifecycle Support | — |
| Red Hat | Red Hat Enterprise Linux 7 Extended Lifecycle Support | — |
| Red Hat | Red Hat Enterprise Linux 8 | — |
| Red Hat | Red Hat Enterprise Linux 8 | — |
| Red Hat | Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support | — |
| Red Hat | Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On | — |
| Red Hat | Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support | — |
| Red Hat | Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On | — |
| Red Hat | Red Hat Enterprise Linux 8.8 Telecommunications Update Service | — |
| Red Hat | Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions | — |
| Red Hat | Red Hat Enterprise Linux 9 | — |
| Red Hat | Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions | — |
| Red Hat | Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions | — |
| Red Hat | Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions | — |
| Red Hat | Red Hat Enterprise Linux 9.6 Extended Update Support | — |
| Red Hat | Red Hat Enterprise Linux 10 | — |
| Red Hat | Red Hat Enterprise Linux 6 | — |
| Red Hat | Red Hat Enterprise Linux 9 | — |
References
- https://git.kernel.org/stable/c/1e2a44875b6afb4add1115f7f3351dcbeb6f273dPatch
- https://git.kernel.org/stable/c/2d8b30b496bc53e961ba7415fd629fc27813017c
- https://git.kernel.org/stable/c/654aeddbc6e0f6e56531985bb12328ab4230c6c1
- https://git.kernel.org/stable/c/8b7833f3bce35cb0d01c1503781523c099c675f0Patch
- https://git.kernel.org/stable/c/c9341307ea16b9395c2e4c9c94d8499d91fe31d0Patch
- https://git.kernel.org/stable/c/f0dbd9355ce1e93808541260c7ffab7956df9233
- https://access.redhat.com/errata/RHSA-2026:25120
- https://access.redhat.com/errata/RHSA-2026:25121
- https://access.redhat.com/errata/RHSA-2026:25217
- https://access.redhat.com/errata/RHSA-2026:33900
- https://access.redhat.com/errata/RHSA-2026:34094
- https://access.redhat.com/errata/RHSA-2026:34095
- https://access.redhat.com/errata/RHSA-2026:34443
- https://access.redhat.com/errata/RHSA-2026:35863
- https://access.redhat.com/errata/RHSA-2026:35894
- https://access.redhat.com/errata/RHSA-2026:35896
- https://access.redhat.com/errata/RHSA-2026:36216
- https://access.redhat.com/errata/RHSA-2026:41236
- https://access.redhat.com/security/cve/CVE-2026-46181
- https://bugzilla.redhat.com/show_bug.cgi?id=2482532
- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-46181.json
Timeline
- Published
- May 28, 2026
- Last modified
- Oct 30, 2026
- NVD status
- Modified