Ubuntu-specific modifications to accountsservice (in patch file debian/patches/0010-set-language.patch) caused the fallback_locale variable, pointing to static storage, to be freed, in the user_change_language_authorized_cb function. This is reachable via the SetLanguage dbus function. This is fixed in versions 0.6.55-0ubuntu12~20.04.5, 0.6.55-0ubuntu13.3, 0.6.55-0ubuntu14.1.
Published 2021-11-17 04:15:07
Updated 2023-06-12 07:16:03
View at NVD,   CVE.org

Products affected by CVE-2021-3939

Exploit prediction scoring system (EPSS) score for CVE-2021-3939

0.04%
Probability of exploitation activity in the next 30 days EPSS Score History
~ 10 %
Percentile, the proportion of vulnerabilities that are scored at or less

CVSS scores for CVE-2021-3939

Base Score Base Severity CVSS Vector Exploitability Score Impact Score Score Source First Seen
7.2
HIGH AV:L/AC:L/Au:N/C:C/I:C/A:C
3.9
10.0
NIST
7.8
HIGH CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
1.8
5.9
NIST
7.8
HIGH CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H
1.1
6.0
Canonical Ltd.

CWE ids for CVE-2021-3939

  • The product calls free() on a pointer to memory that was not allocated using associated heap allocation functions such as malloc(), calloc(), or realloc().
    Assigned by: security@ubuntu.com (Secondary)
  • The product attempts to return a memory resource to the system, but it calls the wrong release function or calls the appropriate release function incorrectly.
    Assigned by: nvd@nist.gov (Primary)

References for CVE-2021-3939

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