CVE catalog

CVE-2020-6096

glibc: CVE-2020-6096

Severity: High · CVSS 8.1CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Published: Mar 2, 2020, 12:00:00 AM UTC
Source: [NVD] · [CVE record]
EPSS: 5.48% · Oct 25, 2026

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

Vulnerable and fixed packages

Distribution-reported package versions and fixes. These do not depend on matching against the OpenFactory package catalog.

Distribution	Package	Release	Version	Status
Debian	glibc	sid	`2.43-7`	fixed
Debian	glibc	forky	`2.43-7`	fixed
Debian	glibc	trixie	`2.41-12+deb13u4`	fixed
Debian	glibc	bookworm	`2.36-9+deb12u14`	fixed
Debian	glibc	bookworm-security	`2.36-9+deb12u7`	fixed
Cpe	glibc	Not reported	Not reported	unknown
Cpe	fedora	Not reported	Not reported	unknown
Cpe	debian_linux	Not reported	Not reported	unknown
Ubuntu	eglibc	pro	`2.17-93ubuntu4`	vulnerable
Ubuntu	eglibc	pro	`2.18-0ubuntu1`	vulnerable
Ubuntu	eglibc	pro	`2.18-0ubuntu2`	vulnerable
Ubuntu	eglibc	pro	`2.18-0ubuntu4`	vulnerable
Ubuntu	eglibc	pro	`2.18-0ubuntu5`	vulnerable
Ubuntu	eglibc	pro	`2.18-0ubuntu6`	vulnerable
Ubuntu	eglibc	pro	`2.18-0ubuntu7`	vulnerable
Ubuntu	eglibc	pro	`2.19-0ubuntu2`	vulnerable
Ubuntu	eglibc	pro	`2.19-0ubuntu3`	vulnerable
Ubuntu	eglibc	pro	`2.19-0ubuntu4`	vulnerable
Ubuntu	eglibc	pro	`2.19-0ubuntu5`	vulnerable
Ubuntu	eglibc	pro	`2.19-0ubuntu6`	vulnerable
Ubuntu	eglibc	pro	`2.19-0ubuntu6.1`	vulnerable
Ubuntu	eglibc	pro	`2.19-0ubuntu6.3`	vulnerable
Ubuntu	eglibc	pro	`2.19-0ubuntu6.4`	vulnerable
Ubuntu	eglibc	pro	`2.19-0ubuntu6.5`	vulnerable
Ubuntu	eglibc	pro	`2.19-0ubuntu6.6`	vulnerable
Ubuntu	eglibc	pro	`2.19-0ubuntu6.7`	vulnerable
Ubuntu	eglibc	pro	`2.19-0ubuntu6.8`	vulnerable
Ubuntu	eglibc	pro	`2.19-0ubuntu6.9`	vulnerable
Ubuntu	eglibc	pro	`2.19-0ubuntu6.10`	vulnerable
Ubuntu	eglibc	pro	`2.19-0ubuntu6.11`	vulnerable
Ubuntu	eglibc	pro	`2.19-0ubuntu6.13`	vulnerable
Ubuntu	eglibc	pro	`2.19-0ubuntu6.14`	vulnerable
Ubuntu	eglibc	pro	`2.19-0ubuntu6.15`	vulnerable
Ubuntu	eglibc	pro	`2.19-0ubuntu6.15+esm1`	vulnerable
Ubuntu	eglibc	pro	`2.19-0ubuntu6.15+esm2`	vulnerable
Ubuntu	eglibc	pro	`2.19-0ubuntu6.15+esm3`	vulnerable
Ubuntu	eglibc	pro	`2.19-0ubuntu6.15+esm4`	vulnerable
Ubuntu	glibc	16.04	`2.21-0ubuntu4`	vulnerable
Ubuntu	glibc	16.04	`2.21-0ubuntu5`	vulnerable
Ubuntu	glibc	16.04	`2.21-0ubuntu6`	vulnerable
Ubuntu	glibc	16.04	`2.23-0ubuntu1`	vulnerable
Ubuntu	glibc	16.04	`2.23-0ubuntu2`	vulnerable
Ubuntu	glibc	16.04	`2.23-0ubuntu3`	vulnerable
Ubuntu	glibc	16.04	`2.23-0ubuntu4`	vulnerable
Ubuntu	glibc	16.04	`2.23-0ubuntu5`	vulnerable
Ubuntu	glibc	16.04	`2.23-0ubuntu6`	vulnerable
Ubuntu	glibc	16.04	`2.23-0ubuntu7`	vulnerable
Ubuntu	glibc	16.04	`2.23-0ubuntu9`	vulnerable
Ubuntu	glibc	16.04	`2.23-0ubuntu10`	vulnerable
Ubuntu	glibc	16.04	`2.23-0ubuntu11`	vulnerable
Ubuntu	glibc	16.04	`2.23-0ubuntu11.2`	vulnerable
Ubuntu	glibc	16.04	`2.23-0ubuntu11.3`	fixed
Ubuntu	glibc	18.04	`2.26-0ubuntu2`	vulnerable
Ubuntu	glibc	18.04	`2.26-0ubuntu2.1`	vulnerable
Ubuntu	glibc	18.04	`2.27-0ubuntu2`	vulnerable
Ubuntu	glibc	18.04	`2.27-0ubuntu3`	vulnerable
Ubuntu	glibc	18.04	`2.27-3ubuntu1`	vulnerable
Ubuntu	glibc	18.04	`2.27-3ubuntu1.2`	vulnerable
Ubuntu	glibc	18.04	`2.27-3ubuntu1.3`	vulnerable
Ubuntu	glibc	18.04	`2.27-3ubuntu1.4`	vulnerable
Ubuntu	glibc	18.04	`2.27-3ubuntu1.5`	fixed
Ubuntu	glibc	20.04	`2.30-0ubuntu2`	vulnerable
Ubuntu	glibc	20.04	`2.30-0ubuntu3`	vulnerable
Ubuntu	glibc	20.04	`2.31-0ubuntu5`	vulnerable
Ubuntu	glibc	20.04	`2.31-0ubuntu6`	vulnerable
Ubuntu	glibc	20.04	`2.31-0ubuntu7`	vulnerable
Ubuntu	glibc	20.04	`2.31-0ubuntu9`	vulnerable
Ubuntu	glibc	20.04	`2.31-0ubuntu9.1`	vulnerable
Ubuntu	glibc	20.04	`2.31-0ubuntu9.2`	vulnerable
Ubuntu	glibc	20.04	`2.31-0ubuntu9.3`	vulnerable
Ubuntu	glibc	20.04	`2.31-0ubuntu9.7`	fixed

Fixed-version evidence

Distribution	Package	Type	Release	Fixed version	Urgency	Origin	Bugs
Debian	glibc	source	sid	`2.31-2`	low	Not reported	[961452]
Debian	glibc	source	forky	`2.31-2`	low	Not reported	[961452]
Debian	glibc	source	trixie	`2.31-2`	low	Not reported	[961452]
Debian	glibc	source	bookworm	`2.31-2`	low	Not reported	[961452]
Ubuntu	glibc	deb	16.04	`2.23-0ubuntu11.3`	Not reported	UBUNTU-CVE-2020-6096	Not reported
Ubuntu	glibc	deb	18.04	`2.27-3ubuntu1.5`	Not reported	UBUNTU-CVE-2020-6096	Not reported
Ubuntu	glibc	deb	20.04	`2.31-0ubuntu9.7`	Not reported	UBUNTU-CVE-2020-6096	Not reported

[Debian bug #961452]

OpenFactory catalog packages

Matching against OpenFactory catalog package versions is in progress.

[Debian 12 (Bookworm)]

[glibc-doc]Unknown
Source package: [glibc]
Details (4)
- 2.36-9+deb12u14 · all · bookworm
  Fixed · Fixed: 2.31-2
  dsa · glibc · debian · bookworm
- 2.36-9+deb12u14 · all · bookworm
  Fixed · Fixed: 2.31-2
  dsa · glibc · debian · bookworm
- 2.36-9+deb12u7 · all · bookworm-security
  Fixed · Fixed: 2.31-2
  dsa · glibc · debian · bookworm
- 2.36-9+deb12u7 · all · bookworm-security
  Fixed · Fixed: 2.31-2
  dsa · glibc · debian · bookworm
[glibc-source]Unknown
Source package: [glibc]
Details (4)
- 2.36-9+deb12u14 · all · bookworm
  Fixed · Fixed: 2.31-2
  dsa · glibc · debian · bookworm
- 2.36-9+deb12u14 · all · bookworm
  Fixed · Fixed: 2.31-2
  dsa · glibc · debian · bookworm
- 2.36-9+deb12u7 · all · bookworm-security
  Fixed · Fixed: 2.31-2
  dsa · glibc · debian · bookworm
- 2.36-9+deb12u7 · all · bookworm-security
  Fixed · Fixed: 2.31-2
  dsa · glibc · debian · bookworm
[libc6]Unknown
Source package: [glibc]
Details (4)
- 2.36-9+deb12u14 · amd64 · bookworm
  Fixed · Fixed: 2.31-2
  dsa · glibc · debian · bookworm
- 2.36-9+deb12u14 · arm64 · bookworm
  Fixed · Fixed: 2.31-2
  dsa · glibc · debian · bookworm
- 2.36-9+deb12u7 · amd64 · bookworm-security
  Fixed · Fixed: 2.31-2
  dsa · glibc · debian · bookworm
- 2.36-9+deb12u7 · arm64 · bookworm-security
  Fixed · Fixed: 2.31-2
  dsa · glibc · debian · bookworm
[libc6-dbg]Unknown
Source package: [glibc]
Details (4)
- 2.36-9+deb12u14 · amd64 · bookworm
  Fixed · Fixed: 2.31-2
  dsa · glibc · debian · bookworm
- 2.36-9+deb12u14 · arm64 · bookworm
  Fixed · Fixed: 2.31-2
  dsa · glibc · debian · bookworm
- 2.36-9+deb12u7 · amd64 · bookworm-security
  Fixed · Fixed: 2.31-2
  dsa · glibc · debian · bookworm
- 2.36-9+deb12u7 · arm64 · bookworm-security
  Fixed · Fixed: 2.31-2
  dsa · glibc · debian · bookworm
[libc6-dev]Unknown
Source package: [glibc]
Details (4)
- 2.36-9+deb12u14 · amd64 · bookworm
  Fixed · Fixed: 2.31-2
  dsa · glibc · debian · bookworm
- 2.36-9+deb12u14 · arm64 · bookworm
  Fixed · Fixed: 2.31-2
  dsa · glibc · debian · bookworm
- 2.36-9+deb12u7 · amd64 · bookworm-security
  Fixed · Fixed: 2.31-2
  dsa · glibc · debian · bookworm
- 2.36-9+deb12u7 · arm64 · bookworm-security
  Fixed · Fixed: 2.31-2
  dsa · glibc · debian · bookworm
[libc6-dev-i386]Unknown
Source package: [glibc]
Details (2)
- 2.36-9+deb12u14 · amd64 · bookworm
  Fixed · Fixed: 2.31-2
  dsa · glibc · debian · bookworm
- 2.36-9+deb12u7 · amd64 · bookworm-security
  Fixed · Fixed: 2.31-2
  dsa · glibc · debian · bookworm
[libc6-dev-x32]Unknown
Source package: [glibc]
Details (2)
- 2.36-9+deb12u14 · amd64 · bookworm
  Fixed · Fixed: 2.31-2
  dsa · glibc · debian · bookworm
- 2.36-9+deb12u7 · amd64 · bookworm-security
  Fixed · Fixed: 2.31-2
  dsa · glibc · debian · bookworm
[libc6-i386]Unknown
Source package: [glibc]
Details (2)
- 2.36-9+deb12u14 · amd64 · bookworm
  Fixed · Fixed: 2.31-2
  dsa · glibc · debian · bookworm
- 2.36-9+deb12u7 · amd64 · bookworm-security
  Fixed · Fixed: 2.31-2
  dsa · glibc · debian · bookworm
[libc6-x32]Unknown
Source package: [glibc]
Details (2)
- 2.36-9+deb12u14 · amd64 · bookworm
  Fixed · Fixed: 2.31-2
  dsa · glibc · debian · bookworm
- 2.36-9+deb12u7 · amd64 · bookworm-security
  Fixed · Fixed: 2.31-2
  dsa · glibc · debian · bookworm
[libc-bin]Unknown
Source package: [glibc]
Details (4)
- 2.36-9+deb12u14 · amd64 · bookworm
  Fixed · Fixed: 2.31-2
  dsa · glibc · debian · bookworm
- 2.36-9+deb12u14 · arm64 · bookworm
  Fixed · Fixed: 2.31-2
  dsa · glibc · debian · bookworm
- 2.36-9+deb12u7 · amd64 · bookworm-security
  Fixed · Fixed: 2.31-2
  dsa · glibc · debian · bookworm
- 2.36-9+deb12u7 · arm64 · bookworm-security
  Fixed · Fixed: 2.31-2
  dsa · glibc · debian · bookworm
[libc-dev-bin]Unknown
Source package: [glibc]
Details (4)
- 2.36-9+deb12u14 · amd64 · bookworm
  Fixed · Fixed: 2.31-2
  dsa · glibc · debian · bookworm
- 2.36-9+deb12u14 · arm64 · bookworm
  Fixed · Fixed: 2.31-2
  dsa · glibc · debian · bookworm
- 2.36-9+deb12u7 · amd64 · bookworm-security
  Fixed · Fixed: 2.31-2
  dsa · glibc · debian · bookworm
- 2.36-9+deb12u7 · arm64 · bookworm-security
  Fixed · Fixed: 2.31-2
  dsa · glibc · debian · bookworm
[libc-devtools]Unknown
Source package: [glibc]
Details (4)
- 2.36-9+deb12u14 · amd64 · bookworm
  Fixed · Fixed: 2.31-2
  dsa · glibc · debian · bookworm
- 2.36-9+deb12u14 · arm64 · bookworm
  Fixed · Fixed: 2.31-2
  dsa · glibc · debian · bookworm
- 2.36-9+deb12u7 · amd64 · bookworm-security
  Fixed · Fixed: 2.31-2
  dsa · glibc · debian · bookworm
- 2.36-9+deb12u7 · arm64 · bookworm-security
  Fixed · Fixed: 2.31-2
  dsa · glibc · debian · bookworm
[libc-l10n]Unknown
Source package: [glibc]
Details (4)
- 2.36-9+deb12u14 · all · bookworm
  Fixed · Fixed: 2.31-2
  dsa · glibc · debian · bookworm
- 2.36-9+deb12u14 · all · bookworm
  Fixed · Fixed: 2.31-2
  dsa · glibc · debian · bookworm
- 2.36-9+deb12u7 · all · bookworm-security
  Fixed · Fixed: 2.31-2
  dsa · glibc · debian · bookworm
- 2.36-9+deb12u7 · all · bookworm-security
  Fixed · Fixed: 2.31-2
  dsa · glibc · debian · bookworm
[locales]Unknown
Source package: [glibc]
Details (4)
- 2.36-9+deb12u14 · all · bookworm
  Fixed · Fixed: 2.31-2
  dsa · glibc · debian · bookworm
- 2.36-9+deb12u14 · all · bookworm
  Fixed · Fixed: 2.31-2
  dsa · glibc · debian · bookworm
- 2.36-9+deb12u7 · all · bookworm-security
  Fixed · Fixed: 2.31-2
  dsa · glibc · debian · bookworm
- 2.36-9+deb12u7 · all · bookworm-security
  Fixed · Fixed: 2.31-2
  dsa · glibc · debian · bookworm
[locales-all]Unknown
Source package: [glibc]
Details (4)
- 2.36-9+deb12u14 · amd64 · bookworm
  Fixed · Fixed: 2.31-2
  dsa · glibc · debian · bookworm
- 2.36-9+deb12u14 · arm64 · bookworm
  Fixed · Fixed: 2.31-2
  dsa · glibc · debian · bookworm
- 2.36-9+deb12u7 · amd64 · bookworm-security
  Fixed · Fixed: 2.31-2
  dsa · glibc · debian · bookworm
- 2.36-9+deb12u7 · arm64 · bookworm-security
  Fixed · Fixed: 2.31-2
  dsa · glibc · debian · bookworm
[nscd]Unknown
Source package: [glibc]
Details (4)
- 2.36-9+deb12u14 · amd64 · bookworm
  Fixed · Fixed: 2.31-2
  dsa · glibc · debian · bookworm
- 2.36-9+deb12u14 · arm64 · bookworm
  Fixed · Fixed: 2.31-2
  dsa · glibc · debian · bookworm
- 2.36-9+deb12u7 · amd64 · bookworm-security
  Fixed · Fixed: 2.31-2
  dsa · glibc · debian · bookworm
- 2.36-9+deb12u7 · arm64 · bookworm-security
  Fixed · Fixed: 2.31-2
  dsa · glibc · debian · bookworm

Observed: Oct 23, 2026, 5:52:54 PM UTC

References

[CISA cybersecurity advisories] · [Debian Security Tracker] · [FIRST EPSS] · [National Vulnerability Database (NVD)] · [OSV Package Vulnerability Database] · [Red Hat security advisories and VEX] · [SUSE security advisories and VEX]