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CVE-2019-7309

Published: 3 February 2019

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.

Notes

AuthorNote
mdeslaur
only affects x32
we will not be fixing this issue in Ubuntu stable releases,
marking as ignored

Priority

Negligible

Cvss 3 Severity Score

5.5

Score breakdown

Status

Package Release Status
eglibc
Launchpad, Ubuntu, Debian
bionic Does not exist

cosmic Does not exist

disco Does not exist

eoan Does not exist

focal Does not exist

trusty Ignored

upstream Needs triage

xenial Does not exist

glibc
Launchpad, Ubuntu, Debian
bionic Ignored

cosmic Ignored
(end of life)
disco Ignored
(end of life)
eoan Not vulnerable
(2.30-0ubuntu2.1)
focal Not vulnerable
(2.31-0ubuntu9)
trusty Does not exist

upstream
Released (2.30)
xenial Ignored

Patches:
upstream: https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=3f635fb43389b54f682fc9ed2acc0b2aaf4a923d
upstream: https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=726a78867b3144e9b9da10197bcf59bde3d8b2a4
upstream: https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=9aaa083387fd1e19eb0bbd9f25444a5d5c91e210
upstream: https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=2ebadb6451eda1d518d70e26cf4ceeb0362e2456
upstream: https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=04e767b59b16befce93c6086362acbc1fae63f4e
upstream: https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=2ad78b78d382c5e4bd805334617ac17f35ecff7e
upstream: https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=9146dc9d73aba08cf3fc2613a3f946c219dd2a52

Severity score breakdown

Parameter Value
Base score 5.5
Attack vector Local
Attack complexity Low
Privileges required Low
User interaction None
Scope Unchanged
Confidentiality None
Integrity impact None
Availability impact High
Vector CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H