CVE-2026-46181RDMA/mlx4: Fix mis-use of RCU in mlx4_srq_event()
Updated under an hour ago ()
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No exploitation reported and no EPSS estimate yet.
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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 HIGH (v3.1, CNA)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- Weakness (CWE)
- CWE-366
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Linux
- NVD analysis
- Modified
- Record last updated
- Oct 16, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Linux Linux linux:linux (from the name) | 30353bfc43a1602c020f31d95cf27182ffd23824 builds before 1e2a44875b6afb4add1115f7f3351dcbeb6f273d; 30353bfc43a1602c020f31d95cf27182ffd23824 builds before 8b7833f3bce35cb0d01c1503781523c099c675f0; from 30353bfc43a1602c020f31d95cf27182ffd23824 before c9341307ea16b9395c2e4c9c94d8499d91fe31d0 | CNA record |
Red Hat Red Hat Enterprise Linux 7 Extended Lifecycle Support redhat:rhel_extras_rt_els | from 0:3.10.0-1160.155.1.rt56.1307.el7 not affected | CISA ADP |
from 0:3.10.0-1160.155.1.el7 not affected | CISA ADP | |
Red Hat Red Hat Enterprise Linux 8 redhat:enterprise_linux | from 0:4.18.0-553.132.1.rt7.473.el8_10 not affected | CISA ADP |
from 0:4.18.0-305.197.1.el8_4 not affected | CISA ADP | |
Red Hat Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On redhat:rhel_eus_long_life | from 0:4.18.0-305.197.1.el8_4 not affected | CISA ADP |
from 0:4.18.0-477.150.1.el8_8 not affected | CISA ADP | |
from 0:4.18.0-477.150.1.el8_8 not affected | CISA ADP | |
Red Hat Red Hat Enterprise Linux 9.6 Extended Update Support redhat:rhel_eus | from 0:5.14.0-570.125.1.el9_6 not affected | CISA ADP |
linux linux_kernel linux:linux_kernel | from 4.9 before 6.18.30; from 6.19 before 7.0.7; 7.1; 7.1 | NVD |
References
- https://git.kernel.org/stable/c/1e2a44875b6afb4add1115f7f3351dcbeb6f273dpatch
- https://git.kernel.org/stable/c/8b7833f3bce35cb0d01c1503781523c099c675f0patch
- https://git.kernel.org/stable/c/c9341307ea16b9395c2e4c9c94d8499d91fe31d0patch
- 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
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.