High 7.8Published May 28, 2026

CVE-2026-46181RDMA/mlx4: Fix mis-use of RCU in mlx4_srq_event()

Updated under an hour ago (Oct 26, 2026, 5:40 PM ET)

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No exploitation reported and no EPSS estimate yet.

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Exploited in the last 30 days

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 21, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

Linux Linux linux:linux (from the name)	30353bfc43a1602c020f31d95cf27182ffd23824 builds before 2d8b30b496bc53e961ba7415fd629fc27813017c; from 30353bfc43a1602c020f31d95cf27182ffd23824 before f0dbd9355ce1e93808541260c7ffab7956df9233; 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
Red Hat Red Hat Enterprise Linux 7 Extended Lifecycle Support redhat:rhel_els	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
Red Hat Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support redhat:rhel_aus	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
Red Hat Red Hat Enterprise Linux 8.8 Telecommunications Update Service redhat:rhel_tus	from 0:4.18.0-477.150.1.el8_8 not affected	CISA ADP
Red Hat Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions redhat:rhel_e4s	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

References

https://git.kernel.org/stable/c/2d8b30b496bc53e961ba7415fd629fc27813017c
https://git.kernel.org/stable/c/f0dbd9355ce1e93808541260c7ffab7956df9233
https://git.kernel.org/stable/c/1e2a44875b6afb4add1115f7f3351dcbeb6f273d	patch
https://git.kernel.org/stable/c/8b7833f3bce35cb0d01c1503781523c099c675f0	patch
https://git.kernel.org/stable/c/c9341307ea16b9395c2e4c9c94d8499d91fe31d0	patch
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
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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.