---
title: "CVE-2026-93203: Linux kernel batman-adv - Data Tampering"
description: "Linux kernel batman-adv contains a CRC corruption vulnerability caused by parallel claim add operations in batadv_bla_add_claim(), letting attackers cause incorrect CRC calculations in backbone claims, exploit requires concurrent claim processing."
url: https://panop.io/threat-heartbeat/CVE-2026-93203/
---

# CVE-2026-93203 Linux kernel batman-adv - Data Tampering

Linux kernel batman-adv contains a CRC corruption vulnerability caused by parallel claim add operations in batadv\_bla\_add\_claim(), letting attackers cause incorrect CRC calculations in backbone claims, exploit requires concurrent claim processing.

CVSS base score 7.1 /10

High

CISA KEV

Not listed

Public exploit

None known

Authentication

Not required

EPSS

0.33% chance of exploitation in 30 days

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-93203)

## Details

Type

Data Tampering

Impact

Data Tampering

CVSS vector

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

Published

17 September 2026

Updated

15 October 2026

## Vendor fix

Update to the latest Linux kernel version containing the fix for batman-adv CRC corruption.

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-2026-93203](https://nvd.nist.gov/vuln/detail/CVE-2026-93203)
- [https://git.kernel.org/stable/c/08645ab95768b88e2ff85a89211994651710465b](https://git.kernel.org/stable/c/08645ab95768b88e2ff85a89211994651710465b)
- [https://git.kernel.org/stable/c/1d390db003cbb52cdd86837608bff3794501a5ea](https://git.kernel.org/stable/c/1d390db003cbb52cdd86837608bff3794501a5ea)
- [https://git.kernel.org/stable/c/3d4a9ae2c69c0fe4c3c69587288241243bb7a39b](https://git.kernel.org/stable/c/3d4a9ae2c69c0fe4c3c69587288241243bb7a39b)
- [https://git.kernel.org/stable/c/8bcfa58c4277bff1882a23547c37ab08aa1de12f](https://git.kernel.org/stable/c/8bcfa58c4277bff1882a23547c37ab08aa1de12f)
- [https://git.kernel.org/stable/c/a3e07db74f22a85aeeb51c600da5c98b9cbca11f](https://git.kernel.org/stable/c/a3e07db74f22a85aeeb51c600da5c98b9cbca11f)
- [https://git.kernel.org/stable/c/ad982d925f00d860d2467811256ffadcccd9e4a7](https://git.kernel.org/stable/c/ad982d925f00d860d2467811256ffadcccd9e4a7)
- [https://git.kernel.org/stable/c/d5b0e7574da5a485f4dbec32a15911900a4487c2](https://git.kernel.org/stable/c/d5b0e7574da5a485f4dbec32a15911900a4487c2)
- [https://git.kernel.org/stable/c/e54602d9e38db8573f2097d60c7ea8be0a5af1fa](https://git.kernel.org/stable/c/e54602d9e38db8573f2097d60c7ea8be0a5af1fa)

[← All CVEs](https://panop.io/threat-heartbeat/)

## 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

Panop answers these inside your environment, for this CVE and every other finding.

[Book a demo](https://panop.io/demo)