Bug#883729: glibc: CVE-2017-17426: malloc returns pointer from tcache_get when should return NULL

[Salvatore Bonaccorso <carnil@debian.org>]

Source: glibc
Version: 2.26-0experimental1
Severity: important
Tags: patch security upstream fixed-upstream
Forwarded: https://sourceware.org/bugzilla/show_bug.cgi?id=22375

Hi,

the following vulnerability was published for glibc (only affecting
experimental)

CVE-2017-17426[0]:
| The malloc function in the GNU C Library (aka glibc or libc6) 2.26
| could return a memory block that is too small if an attempt is made to
| allocate an object whose size is close to SIZE_MAX, potentially leading
| to a subsequent heap overflow. This occurs because the per-thread cache
| (aka tcache) feature enables a code path that lacks an integer overflow
| check.

If you fix the vulnerability please also make sure to include the
CVE (Common Vulnerabilities & Exposures) id in your changelog entry.

For further information see:

[0] https://security-tracker.debian.org/tracker/CVE-2017-17426
    https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2017-17426
[1] https://sourceware.org/bugzilla/show_bug.cgi?id=22375

Regards,
Salvatore