CVE-2019-7309

In the GNU C Library (aka glibc or libc6) through 2.29, the memcmp function for the x32 architecture can incorrectly return zero (indicating that the inputs are equal) because the RDX most significant bit is mishandled.

CVSS 3.0

5.5CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

EPSS

0.6% chance of exploitation in the next 30 days; higher than 48% of CVEs (scores of 2026-10-25)

Published

2019-02-03

Modified

2026-10-14

Record from

the NVD, synced 2026-10-19

Affected

• gnu:glibc

References

• http://www.securityfocus.com/bid/106835
• https://security.gentoo.org/glsa/202006-04
• https://sourceware.org/bugzilla/show_bug.cgi?id=24155
• https://sourceware.org/ml/libc-alpha/2019-02/msg00041.html
• http://www.securityfocus.com/bid/106835

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