# CVE-2022-26495: nbd-client: In nbd-server in nbd before 3.24, there is an integer overflow with aresultant heap-based buffer overflow

CVE-2022-26495 is fixed in 3 products on 1 platform, first by nbd-client 1:3.16.2-1ubuntu0.2, released March 5, 2022. It is not reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/cve/CVE-2022-26495
- Priority: High
- CVSS: 9.8 (Medium)
- EPSS: 0.0286
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Mar 5, 2022

## Description

In nbd-server in nbd before 3.24, there is an integer overflow with aresultant heap-based buffer overflow. A value of 0xffffffff in the namelength field will cause a zero-sized buffer to be allocated for the name,resulting in a write to a dangling pointer. This issue exists for theNBD_OPT_INFO, NBD_OPT_GO, and NBD_OPT_EXPORT_NAME messages.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | nbd Debian 11.6 (bullseye) | 1:3.21-1+deb11u1 | [DSA-5100-1](https://patchblox.com/security/data/fix/linux/dsa-5100-1.md) | Mar 12, 2022 |
| Linux | nbd Debian 12.15 (bookworm) | 1:3.24-1 | [DEBIAN-CVE-2022-26495](https://patchblox.com/security/data/fix/linux/debian-cve-2022-26495.md) | Mar 6, 2022 |
| Linux | nbd Debian 13.5 (trixie) | 1:3.24-1 | [DEBIAN-CVE-2022-26495](https://patchblox.com/security/data/fix/linux/debian-cve-2022-26495.md) | Mar 6, 2022 |
| Linux | nbd Debian 14 | 1:3.24-1 | [DEBIAN-CVE-2022-26495](https://patchblox.com/security/data/fix/linux/debian-cve-2022-26495.md) | Mar 6, 2022 |
| Linux | nbd-client Ubuntu 18.04.6 LTS (bionic) | 1:3.16.2-1ubuntu0.2 | [nbd-client 1:3.16.2-1ubuntu0.2](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-nbd-client-1-3.16.2-1ubuntu0.2.md) | Mar 5, 2022 |
| Linux | nbd-client Ubuntu 20.04 LTS (focal) | 1:3.20-1ubuntu0.1 | [nbd-client 1:3.20-1ubuntu0.1](https://patchblox.com/security/data/fix/linux/ubuntu-focal-nbd-client-1-3.20-1ubuntu0.1.md) | Mar 5, 2022 |
| Linux | nbd-client Ubuntu 22.04.1 LTS (jammy) | 1:3.23-3ubuntu1 | [nbd-client 1:3.23-3ubuntu1](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-nbd-client-1-3.23-3ubuntu1.md) | Mar 5, 2022 |
| Linux | nbd-client Ubuntu 24.10 (oracular) | 1:3.23-3ubuntu1 | [nbd-client 1:3.23-3ubuntu1](https://patchblox.com/security/data/fix/linux/ubuntu-oracular-nbd-client-1-3.23-3ubuntu1.md) | Jan 16, 2026 |
| Linux | nbd-client Ubuntu 25.04 (plucky) | 1:3.23-3ubuntu1 | [nbd-client 1:3.23-3ubuntu1](https://patchblox.com/security/data/fix/linux/ubuntu-plucky-nbd-client-1-3.23-3ubuntu1.md) | Jan 16, 2026 |
| Linux | nbd-server Ubuntu 18.04.6 LTS (bionic) | 1:3.16.2-1ubuntu0.2 | [nbd-server 1:3.16.2-1ubuntu0.2](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-nbd-server-1-3.16.2-1ubuntu0.2.md) | Mar 5, 2022 |
| Linux | nbd-server Ubuntu 20.04 LTS (focal) | 1:3.20-1ubuntu0.1 | [nbd-server 1:3.20-1ubuntu0.1](https://patchblox.com/security/data/fix/linux/ubuntu-focal-nbd-server-1-3.20-1ubuntu0.1.md) | Mar 5, 2022 |
| Linux | nbd-server Ubuntu 22.04.1 LTS (jammy) | 1:3.23-3ubuntu1 | [nbd-server 1:3.23-3ubuntu1](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-nbd-server-1-3.23-3ubuntu1.md) | Mar 5, 2022 |
| Linux | nbd-server Ubuntu 24.10 (oracular) | 1:3.23-3ubuntu1 | [nbd-server 1:3.23-3ubuntu1](https://patchblox.com/security/data/fix/linux/ubuntu-oracular-nbd-server-1-3.23-3ubuntu1.md) | Jan 16, 2026 |
| Linux | nbd-server Ubuntu 25.04 (plucky) | 1:3.23-3ubuntu1 | [nbd-server 1:3.23-3ubuntu1](https://patchblox.com/security/data/fix/linux/ubuntu-plucky-nbd-server-1-3.23-3ubuntu1.md) | Jan 16, 2026 |

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Data as of 2026-11-08T13:06:02Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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