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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.

Severity
Medium 5.5
Published
3 Feb 2019
Last changed
14 Oct 2026
Added to UpHeron
1 Nov 2026
Exploit chance
0.6% in the next 30 daysHigher than 49% of CVEs. EPSS by FIRST, 10 Nov 2026
Attack
Needs local access · Needs a user account · No user action needed
Attacker can
Take it down
CVSS vector
CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Sources
NVD

Affected software

SoftwareAffected versions
GNU C LibraryServers and applications · cpe:a:gnu:glibc
  • Every version up to 2.29

References

  • NVD https://nvd.nist.gov/vuln/detail/CVE-2019-7309
  • CVE.org https://www.cve.org/CVERecord?id=CVE-2019-7309