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Fencer Intel
high 7.5

CVE-2015-5229 json

The calloc function in the glibc package in Red Hat Enterprise Linux (RHEL) 6.7 and 7.2 does not properly initialize memory areas, which mi…

published 2016-04-08 10 y ago modified 2026-06-17 4 mo ago also EUVD-2015-5225

cvss
7.5
version 3.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
2.2%
EPSS 2.2% chance of exploitation in 30 days, percentile 82%
public exploits
0
none known

Summary

The calloc function in the glibc package in Red Hat Enterprise Linux (RHEL) 6.7 and 7.2 does not properly initialize memory areas, which might allow context-dependent attackers to cause a denial of service (hang or crash) via unspecified vectors.

Patch / fix

  • glibc RHEL 6 2.12-1.166.el6_7.1
  • nscd RHEL 6 2.12-1.166.el6_7.1
  • glibc-utils RHEL 6 2.12-1.166.el6_7.1
  • glibc-common RHEL 6 2.12-1.166.el6_7.1
  • glibc-debuginfo-common RHEL 6 2.12-1.166.el6_7.1
  • glibc RHEL 7 2.17-106.el7_2.4
  • nscd RHEL 7 2.17-106.el7_2.4
  • glibc-utils RHEL 7 2.17-106.el7_2.4

red hat advisories RHBA-2015:1465RHSA-2016:0176

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2015-5229 updated cvss 2.6

glibc: calloc may return non-zero memory

  • Red Hat Enterprise Linux Client (v. 7) nscd 2.17-106.el7_2.4, glibc 2.17-106.el7_2.4, glibc-utils 2.17-106.el7_2.4, glibc-common 2.17-106.el7_2.4, glibc-debuginfo-common 2.17-106.el7_2.4 Red Hat Enterprise Linux Client Optional (v. 7) glibc-debuginfo-common 2.17-106.el7_2.4 Red Hat Enterprise Linux ComputeNode (v. 7) nscd 2.17-106.el7_2.4, glibc 2.17-106.el7_2.4, glibc-utils 2.17-106.el7_2.4, glibc-common 2.17-106.el7_2.4, glibc-debuginfo-common 2.17-106.el7_2.4 Red Hat Enterprise Linux ComputeNode Optional (v. 7) glibc-debuginfo-common 2.17-106.el7_2.4
    fixed: vendor fix RHSA-2016:0176
  • Red Hat Enterprise Linux Desktop (v. 6) nscd 2.12-1.166.el6_7.1, glibc 2.12-1.166.el6_7.1, glibc-utils 2.12-1.166.el6_7.1, glibc-common 2.12-1.166.el6_7.1, glibc-debuginfo-common 2.12-1.166.el6_7.1 Red Hat Enterprise Linux Desktop Optional (v. 6) glibc-debuginfo-common 2.12-1.166.el6_7.1 Red Hat Enterprise Linux HPC Node (v. 6) nscd 2.12-1.166.el6_7.1, glibc 2.12-1.166.el6_7.1, glibc-utils 2.12-1.166.el6_7.1, glibc-common 2.12-1.166.el6_7.1, glibc-debuginfo-common 2.12-1.166.el6_7.1 Red Hat Enterprise Linux HPC Node Optional (v. 6) glibc-debuginfo-common 2.12-1.166.el6_7.1 Red Hat Enterprise Linux Server (v. 6) nscd 2.12-1.166.el6_7.1, glibc 2.12-1.166.el6_7.1, glibc-utils 2.12-1.166.el6_7.1, glibc-common 2.12-1.166.el6_7.1, glibc-debuginfo-common 2.12-1.166.el6_7.1
    fixed: vendor fix RHBA-2015:1465
  • Red Hat Enterprise Linux Server (v. 7) nscd 2.17-106.el7_2.4, glibc 2.17-106.el7_2.4, glibc-utils 2.17-106.el7_2.4, glibc-common 2.17-106.el7_2.4, glibc-debuginfo-common 2.17-106.el7_2.4
    fixed: vendor fix RHSA-2016:0176
  • Red Hat Enterprise Linux Server Optional (v. 6) glibc-debuginfo-common 2.12-1.166.el6_7.1
    fixed: vendor fix RHBA-2015:1465
  • Red Hat Enterprise Linux Server Optional (v. 7) glibc-debuginfo-common 2.17-106.el7_2.4
    fixed: vendor fix RHSA-2016:0176
  • Red Hat Enterprise Linux Workstation (v. 6) nscd 2.12-1.166.el6_7.1, glibc 2.12-1.166.el6_7.1, glibc-utils 2.12-1.166.el6_7.1, glibc-common 2.12-1.166.el6_7.1, glibc-debuginfo-common 2.12-1.166.el6_7.1
    fixed: vendor fix RHBA-2015:1465
  • Red Hat Enterprise Linux Workstation (v. 7) nscd 2.17-106.el7_2.4, glibc 2.17-106.el7_2.4, glibc-utils 2.17-106.el7_2.4, glibc-common 2.17-106.el7_2.4, glibc-debuginfo-common 2.17-106.el7_2.4
    fixed: vendor fix RHSA-2016:0176
  • Red Hat Enterprise Linux Workstation Optional (v. 6) glibc-debuginfo-common 2.12-1.166.el6_7.1
    fixed: vendor fix RHBA-2015:1465
show 2 more
  • Red Hat Enterprise Linux Workstation Optional (v. 7) glibc-debuginfo-common 2.17-106.el7_2.4
    fixed: vendor fix RHSA-2016:0176
  • Red Hat Enterprise Linux 5 glibc
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

2.24% chance of exploitation in the next 30 days, higher than 82% of all scored CVEs (FIRST EPSS, 2026-11-09).

CVSS scores

assigned by version score vector
NVD 3.0 7.5 CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
NVD 2.0 5.0 AV:N/AC:L/Au:N/C:N/I:N/A:P

Classification

Weakness

References

Sources

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.