---
title: "CVE-2026-89510: Linux Kernel RDMA/cxgb4 - Use After Free"
description: "Linux kernel RDMA/cxgb4 contains a use-after-free vulnerability caused by accessing freed device memory during asynchronous registration work, letting attackers cause memory corruption or system instability, exploit requires device removal during registration."
url: https://panop.io/threat-heartbeat/CVE-2026-89510/
---

# CVE-2026-89510 Linux Kernel RDMA/cxgb4 - Use After Free

Linux kernel RDMA/cxgb4 contains a use-after-free vulnerability caused by accessing freed device memory during asynchronous registration work, letting attackers cause memory corruption or system instability, exploit requires device removal during registration.

CVSS base score 7.8 /10

High

CISA KEV

Not listed

Public exploit

None known

Authentication

Required

EPSS

0.18% chance of exploitation in 30 days

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-89510)

## Details

Type

Use After Free

Impact

Denial Of Service, Remote Code Execution

CVSS vector

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Published

11 September 2026

Updated

15 October 2026

## Vendor fix

Update to the latest Linux kernel version with the fix that cancels reg\_work before device removal.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

## References

- [https://nvd.nist.gov/vuln/detail/CVE-2026-89510](https://nvd.nist.gov/vuln/detail/CVE-2026-89510)
- [https://git.kernel.org/stable/c/4681e731db07769846901cfabdd3e53f765eb9d3](https://git.kernel.org/stable/c/4681e731db07769846901cfabdd3e53f765eb9d3)
- [https://git.kernel.org/stable/c/672ee1981db10569ec96030bddb322f18382ec04](https://git.kernel.org/stable/c/672ee1981db10569ec96030bddb322f18382ec04)
- [https://git.kernel.org/stable/c/e6e79e7be87c5ea92728060a3d7fb56890a91e45](https://git.kernel.org/stable/c/e6e79e7be87c5ea92728060a3d7fb56890a91e45)
- [https://git.kernel.org/stable/c/320e5258a53af0abc5abd9eb01519a48bab2dee8](https://git.kernel.org/stable/c/320e5258a53af0abc5abd9eb01519a48bab2dee8)
- [https://git.kernel.org/stable/c/85f438382a865a4dc4c50e6b884310bb2b60fc4d](https://git.kernel.org/stable/c/85f438382a865a4dc4c50e6b884310bb2b60fc4d)
- [https://git.kernel.org/stable/c/a7100601aa1a39f799a566acce10db20eaf4b7f2](https://git.kernel.org/stable/c/a7100601aa1a39f799a566acce10db20eaf4b7f2)
- [https://git.kernel.org/stable/c/fe9c591026c576d8b1f72aab5e4cd67350530763](https://git.kernel.org/stable/c/fe9c591026c576d8b1f72aab5e4cd67350530763)
- [https://git.kernel.org/stable/c/3265d558dfafab8f12f5fba06ebbf15cae9f3225](https://git.kernel.org/stable/c/3265d558dfafab8f12f5fba06ebbf15cae9f3225)

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## What this record can't tell you

- Whether you run the affected software, and where
- Whether an attacker can actually reach and exploit it
- The misconfigurations that never get a CVE number
- What it would cost the business, ranked into what to fix first

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