Bug 1667931 (CVE-2019-6488)

Summary: CVE-2019-6488 glibc: Incorrect attempt to use a 64-bit register for size_t in assembly codes results in segmentation fault
Product: [Other] Security Response Reporter: Dhananjay Arunesh <darunesh>
Component: vulnerabilityAssignee: Red Hat Product Security <security-response-team>
Status: CLOSED NOTABUG QA Contact:
Severity: medium Docs Contact:
Priority: medium    
Version: unspecifiedCC: abhgupta, aoliva, arjun.is, ashankar, bmcclain, codonell, dbaker, dblechte, dfediuck, dj, eedri, fweimer, glibc-bugzilla, jokerman, law, mfabian, mgoldboi, michal.skrivanek, mnewsome, pfrankli, rth, sbonazzo, sherold, siddhesh, sthangav, trankin
Target Milestone: ---Keywords: Security
Target Release: ---   
Hardware: All   
OS: Linux   
Fixed In Version: Doc Type: If docs needed, set a value
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Story Points: ---
Clone Of: Environment:
Last Closed: 2019-01-21 15:40:16 UTC Type: ---
Regression: --- Mount Type: ---
Documentation: --- CRM:
Verified Versions: Category: ---
oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
Bug Depends On: 1667932    
Bug Blocks: 1667933    

Description Dhananjay Arunesh 2019-01-21 13:16:05 UTC
The string component in the GNU C Library (aka glibc or libc6) through 2.28, when running on the x32 architecture, incorrectly attempts to use a 64-bit register for size_t in assembly codes, which can lead to a segmentation fault or possibly unspecified other impact, as demonstrated by a crash in __memmove_avx_unaligned_erms in sysdeps/x86_64/multiarch/memmove-vec-unaligned-erms.S during a memcpy.

UPstream Issue:


Comment 1 Dhananjay Arunesh 2019-01-21 13:16:20 UTC
Created glibc tracking bugs for this issue:

Affects: fedora-all [bug 1667932]

Comment 3 Stefan Cornelius 2019-01-21 15:40:19 UTC

This issue did not affect the versions of glibc as shipped with Red Hat Enterprise Linux 5, 6, and 7 as they did not include support for x32.