What’s Vulnerable › Vulnerabilities

CVE-2020-10029

• Severity: medium (CVSS 5.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.8% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2020-03-04 · updated 2026-10-14
• Weakness: CWE-787

Description

The GNU C Library (aka glibc or libc6) before 2.32 could overflow an on-stack buffer during range reduction if an input to an 80-bit long double function contains a non-canonical bit pattern, a seen when passing a 0x5d414141414141410000 value to sinl on x86 targets. This is related to sysdeps/ieee754/ldbl-96/e_rem_pio2l.c.

Affected products

• Canonical Ubuntu Linux: 16.04, 18.04, 19.10
• Debian Linux: 10.0
• Fedoraproject Fedora: 30, 31, 32
• GNU C Library (glibc): before 2.32.0 — fixed in 2.32.0
• Active IQ Unified Manager for VMware vSphere, Linux, and Microsoft Windows: all versions
• NetApp Cloud Backup: all versions
• NetApp H410C Firmware: all versions
• NetApp Hci Management Node: all versions
• NetApp Solidfire: all versions
• NetApp Steelstore Cloud Integrated Storage: all versions
• openSUSE Leap: 15.1

How to fix

Upgrade to a fixed version: GNU C Library (glibc) 2.32.0. Check the vendor advisory for mitigations.

References

• http://lists.opensuse.org/opensuse-security-announce/2020-03/msg00033.html
• https://lists.debian.org/debian-lts-announce/2022/10/msg00021.html
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/23N76M3EDP2GIW4GOIQRYTKRE7PPBRB2/
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/JZTFUD5VH2GU3YOXA2KBQSBIDZRDWNZ3/
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/VU5JJGENOK7K4X5RYAA5PL647C6HD22E/
• https://security.gentoo.org/glsa/202006-04
• https://security.netapp.com/advisory/ntap-20200327-0003/
• https://sourceware.org/bugzilla/show_bug.cgi?id=25487
• https://sourceware.org/git/gitweb.cgi?p=glibc.git%3Ba=commit%3Bh=9333498794cde1d5cca518badf79533a24114b6f
• https://usn.ubuntu.com/4416-1/
• http://lists.opensuse.org/opensuse-security-announce/2020-03/msg00033.html
• https://lists.debian.org/debian-lts-announce/2022/10/msg00021.html

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