CVE-2019-6488

The string component in the GNU C Library (aka glibc or libc6) through 2.28, when running on the...

7.8 HighFix available

The string component in the GNU C Library (aka glibc or libc6) through 2.28, when running on the x32 architecture, incorrectly attempts to use a 64-bit register for size_t in assembly codes, which can lead to a segmentation fault or possibly unspecified other impact, as demonstrated by a crash in __memmove_avx_unaligned_erms in sysdeps/x86_64/multiarch/memmove-vec-unaligned-erms.S during a memcpy.

Attack profile

How easy it is to exploit

Attack vector: Local
Complexity: Low
Privileges needed: Low
User interaction: None

What an attacker can affect

Confidentiality: High
Integrity: High
Availability: High

Exploit likelihood

0.45%Down 0.4 points since Apr 14, 2021

What each source reports

NVD Score used 7.8

Record: CVE-2019-6488
CVSS 3.0: 7.8 HighCVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CVSS 2.0: 4.6 MediumAV:L/AC:L/Au:N/C:P/I:P/A:P
Weakness: CWE-404
Updated: 2026-11-02

CVE List No score

Record: CVE-2019-6488
Updated: 2026-11-02

EUVDEUVD-2019-16048 No score

Record: EUVD-2019-16048
Updated: 2026-11-02

GitHub AdvisoriesGHSA-7x9c-h7v7-85mv 7.8

The string component in the GNU C Library (aka glibc or libc6) through 2.28, when running on the...

Record: GHSA-7x9c-h7v7-85mv
CVSS 3.0: 7.8 HighCVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Weakness: CWE-404
Updated: 2026-11-02

OSV 7.8

Record: CVE-2019-6488
CVSS 3.0: 7.8 HighCVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Updated: 2026-11-02

OSVDEBIAN-CVE-2019-6488 7.8

Record: DEBIAN-CVE-2019-6488
CVSS 3.0: 7.8 HighCVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Updated: 2026-11-02

OSVUBUNTU-CVE-2019-6488 7.8

Record: UBUNTU-CVE-2019-6488
CVSS 3.0: 7.8 HighCVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Updated: 2026-11-02

Affected products

Affected packages

Affected packages
Package	Affected	Fixed
`glibc` Debian:12	before 2.28-6	2.28-6
`glibc` Debian:13	before 2.28-6	2.28-6
`glibc` Debian:14	before 2.28-6	2.28-6
`eglibc` Ubuntu:Pro:14.04:LTS	All versions, plus listed versions 2.17-93ubuntu42.18-0ubuntu12.18-0ubuntu22.18-0ubuntu42.18-0ubuntu5 Show 24 moreShow less 2.18-0ubuntu62.18-0ubuntu72.19-0ubuntu22.19-0ubuntu32.19-0ubuntu42.19-0ubuntu52.19-0ubuntu62.19-0ubuntu6.12.19-0ubuntu6.32.19-0ubuntu6.42.19-0ubuntu6.52.19-0ubuntu6.62.19-0ubuntu6.72.19-0ubuntu6.82.19-0ubuntu6.92.19-0ubuntu6.102.19-0ubuntu6.112.19-0ubuntu6.132.19-0ubuntu6.142.19-0ubuntu6.152.19-0ubuntu6.15+esm12.19-0ubuntu6.15+esm22.19-0ubuntu6.15+esm32.19-0ubuntu6.15+esm4	None known
`glibc` Ubuntu:Pro:16.04:LTS	All versions, plus listed versions 2.21-0ubuntu42.21-0ubuntu52.21-0ubuntu62.23-0ubuntu12.23-0ubuntu2 Show 18 moreShow less 2.23-0ubuntu32.23-0ubuntu42.23-0ubuntu52.23-0ubuntu62.23-0ubuntu72.23-0ubuntu92.23-0ubuntu102.23-0ubuntu112.23-0ubuntu11.22.23-0ubuntu11.32.23-0ubuntu11.3+esm12.23-0ubuntu11.3+esm22.23-0ubuntu11.3+esm32.23-0ubuntu11.3+esm52.23-0ubuntu11.3+esm62.23-0ubuntu11.3+esm72.23-0ubuntu11.3+esm82.23-0ubuntu11.3+esm9	None known
`glibc` Ubuntu:Pro:18.04:LTS	All versions, plus listed versions 2.26-0ubuntu22.26-0ubuntu2.12.27-0ubuntu22.27-0ubuntu32.27-3ubuntu1 Show 11 moreShow less 2.27-3ubuntu1.22.27-3ubuntu1.32.27-3ubuntu1.42.27-3ubuntu1.52.27-3ubuntu1.62.27-3ubuntu1.6+esm12.27-3ubuntu1.6+esm22.27-3ubuntu1.6+esm32.27-3ubuntu1.6+esm42.27-3ubuntu1.6+esm52.27-3ubuntu1.6+esm6	None known

History

History
Recorded	Changed	Sources
Nov 2, 2026	first indexed	CVE List, EUVD, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2019-6488 is a high vulnerability (CVSS 7.8) in Gnu Glibc, published January 18, 2019. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.45%, the 39th percentile. Fixed in glibc 2.28-6.