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.
Does this matter?
Lower severity and a low EPSS score (0.61%). Track it; it rarely justifies an emergency change on its own.
Description
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
- 5.5 MEDIUMCVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
- EPSS
- 0.61% probability · 49th percentile
- Public exploits
- None in Exploit-DB
- CISA KEV
- Not listed
- Affected
- gnu/glibc
- Source
- cve@mitre.org
EPSS 0.6% since 26 October 2026; no change recorded yet. Points are recorded when the score first appears and whenever it moves by a percentage point or more.
References
- http://www.securityfocus.com/bid/106835Third Party Advisory, VDB Entry
- https://security.gentoo.org/glsa/202006-04
- https://sourceware.org/bugzilla/show_bug.cgi?id=24155Exploit, Issue Tracking, Third Party Advisory
- https://sourceware.org/ml/libc-alpha/2019-02/msg00041.htmlMailing List, Third Party Advisory
- http://www.securityfocus.com/bid/106835Third Party Advisory, VDB Entry
- https://security.gentoo.org/glsa/202006-04
- https://sourceware.org/bugzilla/show_bug.cgi?id=24155Exploit, Issue Tracking, Third Party Advisory
- https://sourceware.org/ml/libc-alpha/2019-02/msg00041.htmlMailing List, Third Party Advisory
- https://cert-portal.siemens.com/productcert/html/ssa-398330.html
Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.