The malloc implementation in the GNU C Library (aka glibc or libc6), from version 2.24 to 2.26 on powerpc, and only in version 2.26 on i386, did not properly handle malloc calls with arguments close to SIZE_MAX and could return a pointer to a heap region that is smaller than requested, eventually leading to heap corruption.
Published 2018-02-02 14:29:02
Updated 2020-08-24 17:37:01
Source MITRE
View at NVD,   CVE.org
Vulnerability category: OverflowMemory Corruption

Exploit prediction scoring system (EPSS) score for CVE-2018-6551

Probability of exploitation activity in the next 30 days: 0.26%

Percentile, the proportion of vulnerabilities that are scored at or less: ~ 63 % EPSS Score History EPSS FAQ

CVSS scores for CVE-2018-6551

Base Score Base Severity CVSS Vector Exploitability Score Impact Score Score Source
7.5
HIGH AV:N/AC:L/Au:N/C:P/I:P/A:P
10.0
6.4
NIST
9.8
CRITICAL CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
3.9
5.9
NIST

CWE ids for CVE-2018-6551

  • The product performs a calculation that can produce an integer overflow or wraparound, when the logic assumes that the resulting value will always be larger than the original value. This can introduce other weaknesses when the calculation is used for resource management or execution control.
    Assigned by: nvd@nist.gov (Primary)
  • The product writes data past the end, or before the beginning, of the intended buffer.
    Assigned by: nvd@nist.gov (Primary)

References for CVE-2018-6551

Products affected by CVE-2018-6551

  • GNU » Glibc
    Versions from including (>=) 2.24 and up to, including, (<=) 2.26
    cpe:2.3:a:gnu:glibc:*:*:*:*:*:*:*:*
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