RDMA/mlx4: Fix mis-use of RCU in mlx4_srq_event()
CVE-2026-46181 · published 28 May 2026
How serious is it
- Severity: high, CVSS score 7.8 out of 10.
- No exploit prediction (EPSS) score yet.
- Not on the CISA list of exploited vulnerabilities.
- No public exploit in Exploit-DB.
Is your app affected by CVE-2026-46181?
Paste this prompt into Claude Code, Cursor or any AI coding tool: it runs a free Shippable scan of your project and fixes what it finds. Built with Lovable, Bolt or v0? Scan your live app. Or upload your package file.
Who is affected
- Linux Linux: 30353bfc43a1602c020f31d95cf27182ffd23824 to < 2d8b30b496bc53e961ba7415fd629fc27813017c, 30353bfc43a1602c020f31d95cf27182ffd23824 to < f0dbd9355ce1e93808541260c7ffab7956df9233, 30353bfc43a1602c020f31d95cf27182ffd23824 to < 1e2a44875b6afb4add1115f7f3351dcbeb6f273d, 30353bfc43a1602c020f31d95cf27182ffd23824 to < 8b7833f3bce35cb0d01c1503781523c099c675f0
- Linux Linux: 4.9
How to check
- Find out whether you run the affected product and which version, then compare it with the versions above.
How to fix
Copies a prompt for Claude Code, Cursor or Codex that asks it to check whether you run this product.
- Apply the vendor's update or mitigation from the references below. If there is none yet, limit exposure of the affected service until there is.
- If a vulnerable version was live, check your logs and rotate the secrets that server could read.
The advisory
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.
Check your whole app
Dependencies are only half of it. Free and read-only: before you push, run npx shippable-dev scan localhost:3000 in your project folder, no account needed. For your live app, you prove it's yours with a one-line tag first.
References
- git.kernel.org/stable/c/2d8b30b496bc53e961ba7415fd629fc27813017c
- git.kernel.org/stable/c/f0dbd9355ce1e93808541260c7ffab7956df9233
- git.kernel.org/stable/c/1e2a44875b6afb4add1115f7f3351dcbeb6f273d
- git.kernel.org/stable/c/8b7833f3bce35cb0d01c1503781523c099c675f0
- git.kernel.org/stable/c/c9341307ea16b9395c2e4c9c94d8499d91fe31d0
Merged from CVE List. Last updated 25 Oct 2026. All vulnerabilities · RSS · JSON