Bug 1672232 (CVE-2019-7309) - CVE-2019-7309 glibc: memcmp function incorrectly returns zero
Summary: CVE-2019-7309 glibc: memcmp function incorrectly returns zero
Keywords:
Status: CLOSED NOTABUG
Alias: CVE-2019-7309
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
low
low
Target Milestone: ---
Assignee: Red Hat Product Security
QA Contact:
URL:
Whiteboard:
Depends On: 1685385 1685386 1685387
Blocks: 1672257
TreeView+ depends on / blocked
 
Reported: 2019-02-04 10:35 UTC by Dhananjay Arunesh
Modified: 2023-09-20 14:21 UTC (History)
16 users (show)

Fixed In Version:
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Last Closed: 2019-03-05 10:13:16 UTC
Embargoed:

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System ID Private Priority Status Summary Last Updated
Sourceware 24155 0 None None None 2019-07-15 03:18:45 UTC

Description Dhananjay Arunesh 2019-02-04 10:35:33 UTC 
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.

References:-
https://sourceware.org/bugzilla/show_bug.cgi?id=24155
https://sourceware.org/ml/libc-alpha/2019-02/msg00041.html
Comment 3 Huzaifa S. Sidhpurwala 2019-03-05 05:40:23 UTC 
Created glibc tracking bugs for this issue:

Affects: fedora-all [bug 1685385]
Comment 8 Huzaifa S. Sidhpurwala 2019-03-05 10:13:21 UTC 
Statement:

This issue only affects x32 arch, which is not supported in Red Hat Enterprise Linux kernels (CONFIG_X86_X32 is not set). Therefore glibc packages shipped with Red Hat Enterprise Linux are not affected.
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