---
title: "CVE-2026-98357: Linux Kernel - Use After Free"
description: "Linux kernel contains a use-after-free vulnerability in IB/isert caused by missing synchronization of deferred control PDU completions before connection release, letting attackers cause memory corruption, exploit requires triggering deferred completions during connection teardown."
url: https://panop.io/threat-heartbeat/CVE-2026-98357/
---

# CVE-2026-98357 Linux Kernel - Use After Free

Linux kernel contains a use-after-free vulnerability in IB/isert caused by missing synchronization of deferred control PDU completions before connection release, letting attackers cause memory corruption, exploit requires triggering deferred completions during connection teardown.

CVSS base score 8.1 /10

High

CISA KEV

Not listed

Public exploit

None known

EPSS

0.36% chance of exploitation in 30 days

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-98357)

## Details

Type

Use After Free

Impact

Denial Of Service

CVSS vector

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

Published

6 October 2026

Updated

15 October 2026

## Vendor fix

Update to the latest Linux kernel version containing the fix for deferred control PDU completion synchronization in IB/isert.

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-2026-98357](https://nvd.nist.gov/vuln/detail/CVE-2026-98357)
- [https://git.kernel.org/stable/c/ccdb1523f12bc8a9646de65055d1aafed9e9bcc6](https://git.kernel.org/stable/c/ccdb1523f12bc8a9646de65055d1aafed9e9bcc6)
- [https://git.kernel.org/stable/c/f5613acbe2e346d5c466ef0bd264fca936b69f82](https://git.kernel.org/stable/c/f5613acbe2e346d5c466ef0bd264fca936b69f82)
- [https://git.kernel.org/stable/c/0e230917670c6e6fe3243abfa11299fcbe05b1f4](https://git.kernel.org/stable/c/0e230917670c6e6fe3243abfa11299fcbe05b1f4)
- [https://git.kernel.org/stable/c/505b242d9351690d1385bbe508ab4666f60363ce](https://git.kernel.org/stable/c/505b242d9351690d1385bbe508ab4666f60363ce)
- [https://git.kernel.org/stable/c/7908fbc597a694bbd99bfb59ece73bc3daded68e](https://git.kernel.org/stable/c/7908fbc597a694bbd99bfb59ece73bc3daded68e)
- [https://git.kernel.org/stable/c/7edb8a88d6c76237c8b4435765bee1009e26a50a](https://git.kernel.org/stable/c/7edb8a88d6c76237c8b4435765bee1009e26a50a)
- [https://git.kernel.org/stable/c/a8fe3dfce8c0d8a76dc3d8486a5bff5feebe156f](https://git.kernel.org/stable/c/a8fe3dfce8c0d8a76dc3d8486a5bff5feebe156f)
- [https://git.kernel.org/stable/c/b96b8b3e41c308f606ffd10cfef1a7b9f97414cd](https://git.kernel.org/stable/c/b96b8b3e41c308f606ffd10cfef1a7b9f97414cd)

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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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