CVE-2017-11671

Severity: medium (CVSS 4.0 v3.0)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.5% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2017-07-26 · updated 2026-06-17
Weakness: CWE-338

Description

Under certain circumstances, the ix86_expand_builtin function in i386.c in GNU Compiler Collection (GCC) version 4.6, 4.7, 4.8, 4.9, 5 before 5.5, and 6 before 6.4 will generate instruction sequences that clobber the status flag of the RDRAND and RDSEED intrinsics before it can be read, potentially causing failures of these instructions to go unreported. This could potentially lead to less randomness in random number generation.

Affected products

GNU GCC: 4.6, 4.7, 4.8, 4.9, 5.0, 5.1 (+7)

References

http://openwall.com/lists/oss-security/2017/07/27/2
http://www.securityfocus.com/bid/100018
https://access.redhat.com/errata/RHSA-2018:0849
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=80180
https://gcc.gnu.org/ml/gcc-patches/2017-03/msg01349.html
http://openwall.com/lists/oss-security/2017/07/27/2
http://www.securityfocus.com/bid/100018
https://access.redhat.com/errata/RHSA-2018:0849
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=80180
https://gcc.gnu.org/ml/gcc-patches/2017-03/msg01349.html

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