# CVE-2020-6096: glibc-source: An exploitable signed comparison vulnerability exists in the ARMv7 memcpy()implementation of GNU glibc 2.30.9000

CVE-2020-6096 is fixed in 21 products on 1 platform, first by glibc-source 2.27-3ubuntu1.5, released January 31, 2022. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2020-6096
- Priority: Routine
- CVSS: n/a (Low)
- EPSS: 0.0548
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Apr 1, 2020

## Description

An exploitable signed comparison vulnerability exists in the ARMv7 memcpy()implementation of GNU glibc 2.30.9000. Calling memcpy() (on ARMv7 targetsthat utilize the GNU glibc implementation) with a negative value for the'num' parameter results in a signed comparison vulnerability. If anattacker underflows the 'num' parameter to memcpy(), this vulnerabilitycould lead to undefined behavior such as writing to out-of-bounds memoryand potentially remote code execution. Furthermore, this memcpy()implementation allows for program execution to continue in scenarios wherea segmentation fault or crash should have occurred. The dangers occur inthat subsequent execution and iterations of this code will be executed withthis corrupted data.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | glibc-source Ubuntu 18.04.6 LTS (bionic) | 2.27-3ubuntu1.5 | [glibc-source 2.27-3ubuntu1.5](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-glibc-source-2.27-3ubuntu1.5.md) | Jan 31, 2022 |
| Linux | glibc-source Ubuntu 20.04 LTS (focal) | 2.31-0ubuntu9.7 | [glibc-source 2.31-0ubuntu9.7](https://patchblox.com/security/data/fix/linux/ubuntu-focal-glibc-source-2.31-0ubuntu9.7.md) | Jan 31, 2022 |
| Linux | glibc-source Ubuntu 24.10 (oracular) | 2.32-0ubuntu3 | [glibc-source 2.32-0ubuntu3](https://patchblox.com/security/data/fix/linux/ubuntu-oracular-glibc-source-2.32-0ubuntu3.md) | Jan 16, 2026 |
| Linux | glibc-source Ubuntu 25.04 (plucky) | 2.32-0ubuntu3 | [glibc-source 2.32-0ubuntu3](https://patchblox.com/security/data/fix/linux/ubuntu-plucky-glibc-source-2.32-0ubuntu3.md) | Jan 16, 2026 |
| Linux | libc-bin Ubuntu 18.04.6 LTS (bionic) | 2.27-3ubuntu1.5 | [libc-bin 2.27-3ubuntu1.5](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-libc-bin-2.27-3ubuntu1.5.md) | Jan 31, 2022 |
| Linux | libc-bin Ubuntu 20.04 LTS (focal) | 2.31-0ubuntu9.7 | [libc-bin 2.31-0ubuntu9.7](https://patchblox.com/security/data/fix/linux/ubuntu-focal-libc-bin-2.31-0ubuntu9.7.md) | Jan 31, 2022 |
| Linux | libc-bin Ubuntu 24.10 (oracular) | 2.32-0ubuntu3 | [libc-bin 2.32-0ubuntu3](https://patchblox.com/security/data/fix/linux/ubuntu-oracular-libc-bin-2.32-0ubuntu3.md) | Jan 16, 2026 |
| Linux | libc-bin Ubuntu 25.04 (plucky) | 2.32-0ubuntu3 | [libc-bin 2.32-0ubuntu3](https://patchblox.com/security/data/fix/linux/ubuntu-plucky-libc-bin-2.32-0ubuntu3.md) | Jan 16, 2026 |
| Linux | libc-dev-bin Ubuntu 18.04.6 LTS (bionic) | 2.27-3ubuntu1.5 | [libc-dev-bin 2.27-3ubuntu1.5](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-libc-dev-bin-2.27-3ubuntu1.5.md) | Jan 31, 2022 |
| Linux | libc-dev-bin Ubuntu 20.04 LTS (focal) | 2.31-0ubuntu9.7 | [libc-dev-bin 2.31-0ubuntu9.7](https://patchblox.com/security/data/fix/linux/ubuntu-focal-libc-dev-bin-2.31-0ubuntu9.7.md) | Jan 31, 2022 |
| Linux | libc6 Ubuntu 18.04.6 LTS (bionic) | 2.27-3ubuntu1.5 | [libc6 2.27-3ubuntu1.5](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-libc6-2.27-3ubuntu1.5.md) | Jan 31, 2022 |
| Linux | libc6 Ubuntu 20.04 LTS (focal) | 2.31-0ubuntu9.7 | [libc6 2.31-0ubuntu9.7](https://patchblox.com/security/data/fix/linux/ubuntu-focal-libc6-2.31-0ubuntu9.7.md) | Jan 31, 2022 |
| Linux | libc6 Ubuntu 24.10 (oracular) | 2.32-0ubuntu3 | [libc6 2.32-0ubuntu3](https://patchblox.com/security/data/fix/linux/ubuntu-oracular-libc6-2.32-0ubuntu3.md) | Jan 16, 2026 |
| Linux | libc6 Ubuntu 25.04 (plucky) | 2.32-0ubuntu3 | [libc6 2.32-0ubuntu3](https://patchblox.com/security/data/fix/linux/ubuntu-plucky-libc6-2.32-0ubuntu3.md) | Jan 16, 2026 |
| Linux | libc6-amd64 Ubuntu 18.04.6 LTS (bionic) | 2.27-3ubuntu1.5 | [libc6-amd64 2.27-3ubuntu1.5](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-libc6-amd64-2.27-3ubuntu1.5.md) | Jan 31, 2022 |
| Linux | libc6-amd64 Ubuntu 20.04 LTS (focal) | 2.31-0ubuntu9.7 | [libc6-amd64 2.31-0ubuntu9.7](https://patchblox.com/security/data/fix/linux/ubuntu-focal-libc6-amd64-2.31-0ubuntu9.7.md) | Jan 31, 2022 |
| Linux | libc6-amd64 Ubuntu 24.10 (oracular) | 2.32-0ubuntu3 | [libc6-amd64 2.32-0ubuntu3](https://patchblox.com/security/data/fix/linux/ubuntu-oracular-libc6-amd64-2.32-0ubuntu3.md) | Jan 16, 2026 |
| Linux | libc6-amd64 Ubuntu 25.04 (plucky) | 2.32-0ubuntu3 | [libc6-amd64 2.32-0ubuntu3](https://patchblox.com/security/data/fix/linux/ubuntu-plucky-libc6-amd64-2.32-0ubuntu3.md) | Jan 16, 2026 |
| Linux | libc6-armel Ubuntu 18.04.6 LTS (bionic) | 2.27-3ubuntu1.5 | [libc6-armel 2.27-3ubuntu1.5](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-libc6-armel-2.27-3ubuntu1.5.md) | Jan 31, 2022 |
| Linux | libc6-armel Ubuntu 20.04 LTS (focal) | 2.31-0ubuntu9.7 | [libc6-armel 2.31-0ubuntu9.7](https://patchblox.com/security/data/fix/linux/ubuntu-focal-libc6-armel-2.31-0ubuntu9.7.md) | Jan 31, 2022 |
| Linux | libc6-dev-amd64 Ubuntu 18.04.6 LTS (bionic) | 2.27-3ubuntu1.5 | [libc6-dev-amd64 2.27-3ubuntu1.5](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-libc6-dev-amd64-2.27-3ubuntu1.5.md) | Jan 31, 2022 |
| Linux | libc6-dev-amd64 Ubuntu 20.04 LTS (focal) | 2.31-0ubuntu9.7 | [libc6-dev-amd64 2.31-0ubuntu9.7](https://patchblox.com/security/data/fix/linux/ubuntu-focal-libc6-dev-amd64-2.31-0ubuntu9.7.md) | Jan 31, 2022 |
| Linux | libc6-dev-armel Ubuntu 18.04.6 LTS (bionic) | 2.27-3ubuntu1.5 | [libc6-dev-armel 2.27-3ubuntu1.5](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-libc6-dev-armel-2.27-3ubuntu1.5.md) | Jan 31, 2022 |
| Linux | libc6-dev-armel Ubuntu 20.04 LTS (focal) | 2.31-0ubuntu9.7 | [libc6-dev-armel 2.31-0ubuntu9.7](https://patchblox.com/security/data/fix/linux/ubuntu-focal-libc6-dev-armel-2.31-0ubuntu9.7.md) | Jan 31, 2022 |
| Linux | libc6-dev-i386 Ubuntu 18.04.6 LTS (bionic) | 2.27-3ubuntu1.5 | [libc6-dev-i386 2.27-3ubuntu1.5](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-libc6-dev-i386-2.27-3ubuntu1.5.md) | Jan 31, 2022 |
| Linux | libc6-dev-i386 Ubuntu 20.04 LTS (focal) | 2.31-0ubuntu9.7 | [libc6-dev-i386 2.31-0ubuntu9.7](https://patchblox.com/security/data/fix/linux/ubuntu-focal-libc6-dev-i386-2.31-0ubuntu9.7.md) | Jan 31, 2022 |
| Linux | libc6-dev-s390 Ubuntu 18.04.6 LTS (bionic) | 2.27-3ubuntu1.5 | [libc6-dev-s390 2.27-3ubuntu1.5](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-libc6-dev-s390-2.27-3ubuntu1.5.md) | Jan 31, 2022 |
| Linux | libc6-dev-s390 Ubuntu 20.04 LTS (focal) | 2.31-0ubuntu9.7 | [libc6-dev-s390 2.31-0ubuntu9.7](https://patchblox.com/security/data/fix/linux/ubuntu-focal-libc6-dev-s390-2.31-0ubuntu9.7.md) | Jan 31, 2022 |
| Linux | libc6-dev-x32 Ubuntu 18.04.6 LTS (bionic) | 2.27-3ubuntu1.5 | [libc6-dev-x32 2.27-3ubuntu1.5](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-libc6-dev-x32-2.27-3ubuntu1.5.md) | Jan 31, 2022 |
| Linux | libc6-dev-x32 Ubuntu 20.04 LTS (focal) | 2.31-0ubuntu9.7 | [libc6-dev-x32 2.31-0ubuntu9.7](https://patchblox.com/security/data/fix/linux/ubuntu-focal-libc6-dev-x32-2.31-0ubuntu9.7.md) | Jan 31, 2022 |
| Linux | libc6-i386 Ubuntu 18.04.6 LTS (bionic) | 2.27-3ubuntu1.5 | [libc6-i386 2.27-3ubuntu1.5](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-libc6-i386-2.27-3ubuntu1.5.md) | Jan 31, 2022 |
| Linux | libc6-i386 Ubuntu 20.04 LTS (focal) | 2.31-0ubuntu9.7 | [libc6-i386 2.31-0ubuntu9.7](https://patchblox.com/security/data/fix/linux/ubuntu-focal-libc6-i386-2.31-0ubuntu9.7.md) | Jan 31, 2022 |
| Linux | libc6-i386 Ubuntu 24.10 (oracular) | 2.32-0ubuntu3 | [libc6-i386 2.32-0ubuntu3](https://patchblox.com/security/data/fix/linux/ubuntu-oracular-libc6-i386-2.32-0ubuntu3.md) | Jan 16, 2026 |
| Linux | libc6-i386 Ubuntu 25.04 (plucky) | 2.32-0ubuntu3 | [libc6-i386 2.32-0ubuntu3](https://patchblox.com/security/data/fix/linux/ubuntu-plucky-libc6-i386-2.32-0ubuntu3.md) | Jan 16, 2026 |
| Linux | libc6-lse Ubuntu 18.04.6 LTS (bionic) | 2.27-3ubuntu1.5 | [libc6-lse 2.27-3ubuntu1.5](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-libc6-lse-2.27-3ubuntu1.5.md) | Jan 31, 2022 |
| Linux | libc6-lse Ubuntu 20.04 LTS (focal) | 2.31-0ubuntu9.7 | [libc6-lse 2.31-0ubuntu9.7](https://patchblox.com/security/data/fix/linux/ubuntu-focal-libc6-lse-2.31-0ubuntu9.7.md) | Jan 31, 2022 |
| Linux | libc6-pic Ubuntu 18.04.6 LTS (bionic) | 2.27-3ubuntu1.5 | [libc6-pic 2.27-3ubuntu1.5](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-libc6-pic-2.27-3ubuntu1.5.md) | Jan 31, 2022 |
| Linux | libc6-pic Ubuntu 20.04 LTS (focal) | 2.31-0ubuntu9.7 | [libc6-pic 2.31-0ubuntu9.7](https://patchblox.com/security/data/fix/linux/ubuntu-focal-libc6-pic-2.31-0ubuntu9.7.md) | Jan 31, 2022 |
| Linux | libc6-prof Ubuntu 20.04 LTS (focal) | 2.31-0ubuntu9.7 | [libc6-prof 2.31-0ubuntu9.7](https://patchblox.com/security/data/fix/linux/ubuntu-focal-libc6-prof-2.31-0ubuntu9.7.md) | Jan 31, 2022 |
| Linux | libc6-s390 Ubuntu 18.04.6 LTS (bionic) | 2.27-3ubuntu1.5 | [libc6-s390 2.27-3ubuntu1.5](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-libc6-s390-2.27-3ubuntu1.5.md) | Jan 31, 2022 |
| Linux | libc6-s390 Ubuntu 20.04 LTS (focal) | 2.31-0ubuntu9.7 | [libc6-s390 2.31-0ubuntu9.7](https://patchblox.com/security/data/fix/linux/ubuntu-focal-libc6-s390-2.31-0ubuntu9.7.md) | Jan 31, 2022 |
| Linux | libc6-s390 Ubuntu 24.10 (oracular) | 2.32-0ubuntu3 | [libc6-s390 2.32-0ubuntu3](https://patchblox.com/security/data/fix/linux/ubuntu-oracular-libc6-s390-2.32-0ubuntu3.md) | Jan 16, 2026 |
| Linux | libc6-x32 Ubuntu 18.04.6 LTS (bionic) | 2.27-3ubuntu1.5 | [libc6-x32 2.27-3ubuntu1.5](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-libc6-x32-2.27-3ubuntu1.5.md) | Jan 31, 2022 |
| Linux | libc6-x32 Ubuntu 20.04 LTS (focal) | 2.31-0ubuntu9.7 | [libc6-x32 2.31-0ubuntu9.7](https://patchblox.com/security/data/fix/linux/ubuntu-focal-libc6-x32-2.31-0ubuntu9.7.md) | Jan 31, 2022 |
| Linux | libc6-x32 Ubuntu 24.10 (oracular) | 2.32-0ubuntu3 | [libc6-x32 2.32-0ubuntu3](https://patchblox.com/security/data/fix/linux/ubuntu-oracular-libc6-x32-2.32-0ubuntu3.md) | Jan 16, 2026 |
| Linux | libc6-x32 Ubuntu 25.04 (plucky) | 2.32-0ubuntu3 | [libc6-x32 2.32-0ubuntu3](https://patchblox.com/security/data/fix/linux/ubuntu-plucky-libc6-x32-2.32-0ubuntu3.md) | Jan 16, 2026 |
| Linux | locales Ubuntu 18.04.6 LTS (bionic) | 2.27-3ubuntu1.5 | [locales 2.27-3ubuntu1.5](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-locales-2.27-3ubuntu1.5.md) | Jan 31, 2022 |
| Linux | locales Ubuntu 20.04 LTS (focal) | 2.31-0ubuntu9.7 | [locales 2.31-0ubuntu9.7](https://patchblox.com/security/data/fix/linux/ubuntu-focal-locales-2.31-0ubuntu9.7.md) | Jan 31, 2022 |
| Linux | locales Ubuntu 24.10 (oracular) | 2.32-0ubuntu3 | [locales 2.32-0ubuntu3](https://patchblox.com/security/data/fix/linux/ubuntu-oracular-locales-2.32-0ubuntu3.md) | Jan 16, 2026 |
| Linux | locales Ubuntu 25.04 (plucky) | 2.32-0ubuntu3 | [locales 2.32-0ubuntu3](https://patchblox.com/security/data/fix/linux/ubuntu-plucky-locales-2.32-0ubuntu3.md) | Jan 16, 2026 |
| Linux | locales-all Ubuntu 18.04.6 LTS (bionic) | 2.27-3ubuntu1.5 | [locales-all 2.27-3ubuntu1.5](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-locales-all-2.27-3ubuntu1.5.md) | Jan 31, 2022 |
| Linux | locales-all Ubuntu 20.04 LTS (focal) | 2.31-0ubuntu9.7 | [locales-all 2.31-0ubuntu9.7](https://patchblox.com/security/data/fix/linux/ubuntu-focal-locales-all-2.31-0ubuntu9.7.md) | Jan 31, 2022 |
| Linux | locales-all Ubuntu 24.10 (oracular) | 2.32-0ubuntu3 | [locales-all 2.32-0ubuntu3](https://patchblox.com/security/data/fix/linux/ubuntu-oracular-locales-all-2.32-0ubuntu3.md) | Jan 16, 2026 |
| Linux | locales-all Ubuntu 25.04 (plucky) | 2.32-0ubuntu3 | [locales-all 2.32-0ubuntu3](https://patchblox.com/security/data/fix/linux/ubuntu-plucky-locales-all-2.32-0ubuntu3.md) | Jan 16, 2026 |
| Linux | multiarch-support Ubuntu 18.04.6 LTS (bionic) | 2.27-3ubuntu1.5 | [multiarch-support 2.27-3ubuntu1.5](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-multiarch-support-2.27-3ubuntu1.5.md) | Jan 31, 2022 |
| Linux | nscd Ubuntu 18.04.6 LTS (bionic) | 2.27-3ubuntu1.5 | [nscd 2.27-3ubuntu1.5](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-nscd-2.27-3ubuntu1.5.md) | Jan 31, 2022 |
| Linux | nscd Ubuntu 20.04 LTS (focal) | 2.31-0ubuntu9.7 | [nscd 2.31-0ubuntu9.7](https://patchblox.com/security/data/fix/linux/ubuntu-focal-nscd-2.31-0ubuntu9.7.md) | Jan 31, 2022 |
| Linux | nscd Ubuntu 24.10 (oracular) | 2.32-0ubuntu3 | [nscd 2.32-0ubuntu3](https://patchblox.com/security/data/fix/linux/ubuntu-oracular-nscd-2.32-0ubuntu3.md) | Jan 16, 2026 |
| Linux | nscd Ubuntu 25.04 (plucky) | 2.32-0ubuntu3 | [nscd 2.32-0ubuntu3](https://patchblox.com/security/data/fix/linux/ubuntu-plucky-nscd-2.32-0ubuntu3.md) | Jan 16, 2026 |

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