CoreCVE
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HIGH

glibc: stack-based buffer overflow if the input to any of the printf family of functions is an 80-bit long double with a non-canonical bit pattern

Published Dec 5, 2020

Description

sysdeps/i386/ldbl2mpn.c in the GNU C Library (aka glibc or libc6) before 2.23 on x86 targets has a stack-based buffer overflow if the input to any of the printf family of functions is an 80-bit long double with a non-canonical bit pattern, as seen when passing a \x00\x04\x00\x00\x00\x00\x00\x00\x00\x04 value to sprintf. NOTE: the issue does not affect glibc by default in 2016 or later (i.e., 2.23 or later) because of commits made in 2015 for inlining of C99 math functions through use of GCC built-ins. In other words, the reference to 2.23 is intentional despite the mention of "Fixed for glibc 2.33" in the 26649 reference.

Affected products

Remediation

Red Hat statement

This is essentially a crash which can only be triggered by a non-standard argument passed as a long double input to a member of printf family of functions. The application has to be written in this way to allow this issue to be triggered. The maximum impact is an application crash.

Weaknesses (2)

CWE-121

CWE-787

Out-of-bounds Write

References (9)

Change history (0)

No recorded changes yet.

Sources

CVE.org / MITRE

Status PUBLISHED
Assigner mitre
Published Dec 5, 2020
Updated Aug 4, 2024
Reserved Dec 5, 2020
Link CVE-2020-29573

CISA Vulnrichment

No data

NVD

Status Modified
Modified Jun 17, 2026
Link CVE-2020-29573

Red Hat

Severity Moderate
Public date Sep 22, 2020
Bugzilla 1905213
Link CVE-2020-29573

ENISA EUVD

Assigner mitre
Published Dec 5, 2020
Updated Aug 4, 2024
Link EUVD-2020-21935

GitHub

No data