CVE-2026-46181
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…
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (0.14%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
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.
- CVSS 3.1
- 7.8 HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- EPSS
- 0.14% probability · 4th percentile
- Public exploits
- None in Exploit-DB
- CISA KEV
- Not listed
- Weakness
- CWE-366
- Affected
- linux/linux kernel
- Source
- 416baaa9-dc9f-4396-8d5f-8c081fb06d67
EPSS 0.1% since 26 October 2026; no change recorded yet. Points are recorded when the score first appears and whenever it moves by a percentage point or more.
References
- https://git.kernel.org/stable/c/1e2a44875b6afb4add1115f7f3351dcbeb6f273dPatch
- https://git.kernel.org/stable/c/2d8b30b496bc53e961ba7415fd629fc27813017c
- 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
Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.