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.
The MITRE CVE dictionary describes this issue as:
Find out more about CVE-2019-7309 from the MITRE CVE dictionary dictionary and NIST NVD.
This issue did not affect the versions of glibc as shipped with Red Hat Enterprise Linux as they did not include support for 32bit architectures.
NOTE: The following CVSS v3 metrics and score provided are preliminary and subject to review.
| CVSS3 Base Score | 3.3 |
|---|---|
| CVSS3 Base Metrics | CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L |
| Attack Vector | Local |
| Attack Complexity | Low |
| Privileges Required | Low |
| User Interaction | None |
| Scope | Unchanged |
| Confidentiality | None |
| Integrity Impact | None |
| Availability Impact | Low |
| Platform | Package | State |
|---|---|---|
| Red Hat Virtualization 4 | glibc | Not affected |
| Red Hat Enterprise Linux 7 | glibc | Not affected |
| Red Hat Enterprise Linux 6 | glibc | Not affected |
| Red Hat Enterprise Linux 5 | glibc | Not affected |
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