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Fencer Vulns
high 7.5

CVE-2022-38476 json

A data race could occur in the <code>PK11_ChangePW</code> function, potentially leading to a use-after-free vulnerability.

published 2022-12-22 3 y ago modified 2026-06-17 4 mo ago also EUVD-2022-41059

cvss
7.5
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.9%
EPSS 0.9% chance of exploitation in 30 days, percentile 58%
public exploits
0
none known

Summary

A data race could occur in the <code>PK11_ChangePW</code> function, potentially leading to a use-after-free vulnerability. In Firefox, this lock protected the data when a user changed their master password. This vulnerability affects Firefox ESR < 102.2 and Thunderbird < 102.2.

Patch / fix

  • Mozilla Firefox ESR 102.2
  • Mozilla Thunderbird 102.2
  • firefox-esr Debian 14, Debian 13, Debian 12 102.2.0esr-1
  • thunderbird Debian 14, Debian 13, Debian 12 1:102.2.0-1

debian advisories DEBIAN-CVE-2022-38476

  • thunderbird Ubuntu 18.04 LTS 1:102.2.2+build1-0ubuntu0.18.04.1
  • thunderbird Ubuntu 20.04 LTS 1:102.2.2+build1-0ubuntu0.20.04.1
  • thunderbird Ubuntu 22.04 LTS 1:102.2.2+build1-0ubuntu0.22.04.1

ubuntu advisories UBUNTU-CVE-2022-38476

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • thunderbird RHEL 9 91.13.0-1.el9_0
  • thunderbird RHEL 8 91.13.0-1.el8_6
  • thunderbird RHEL 7 91.13.0-1.el7_9
  • firefox RHEL 8 91.13.0-1.el8_6
  • firefox RHEL 9 91.13.0-1.el9_0
  • firefox RHEL 7 91.13.0-1.el7_9
  • thunderbird RHEL 8.4 EUS 91.13.0-1.el8_4
  • firefox RHEL 8.4 EUS 91.13.0-1.el8_4

red hat advisories RHSA-2022:6166RHSA-2022:6165RHSA-2022:6176RHSA-2022:6164RHSA-2022:6169RHSA-2022:6175

  • MozillaFirefox SLES for SAP 15 SP2, SLES 15 SP2-LTSS, SLES 15 SP2-BCL +10 more 102.3.0-150200.152.61.1
  • MozillaFirefox-branding-SLE SLES for SAP 15 SP2, SLES 15 SP2-LTSS, SLES 15 SP2-BCL +10 more 102-150200.9.10.1
  • MozillaThunderbird SLE Workstation Extension 15 SP4, SLE Workstation Extension 15 SP3, SLE Module for Package Hub 15 SP4 +3 more 102.2.2-150200.8.82.1
  • MozillaFirefox SLES for SAP 12 SP5, SLES for SAP 12 SP4, SLES 12 SP5 +6 more 102.2.0-112.130.1
  • MozillaFirefox-branding-SLE SLES for SAP 12 SP5, SLES for SAP 12 SP4, SLES 12 SP5 +5 more 102-35.9.1
  • MozillaFirefox SLES for SAP 15 SP1, SLES for SAP 15, SLES 15-LTSS +7 more 102.2.0-150000.150.56.1
  • MozillaFirefox-branding-SLE SLES for SAP 15 SP1, SLES for SAP 15, SLES 15-LTSS +7 more 102-150000.4.22.1

suse advisories SUSE-SU-2022:3396-1SUSE-SU-2022:3281-1SUSE-SU-2022:3273-1SUSE-SU-2022:3272-1

  • MozillaThunderbird openSUSE Tumbleweed 102.2.0-1.1

opensuse advisories openSUSE-SU-2024:12287-1

  • thunderbird AlmaLinux 8 91.13.0-1.el8_6.alma
  • thunderbird AlmaLinux 9 91.13.0-1.el9_0.alma
  • firefox AlmaLinux 9 91.13.0-1.el9_0.alma
  • firefox AlmaLinux 8 91.13.0-1.el8_6.alma

almalinux advisories ALSA-2022:6164ALSA-2022:6165ALSA-2022:6174ALSA-2022:6175

  • firefox Rocky Linux 8 91.13.0-1.el8_6
  • thunderbird Rocky Linux 8 91.13.0-1.el8_6

rocky linux advisories RLSA-2022:6175RLSA-2022:6164

  • firefox-esr Alpine 3.23, Alpine 3.22, Alpine 3.21 +3 more 102.2.0-r0

alpine advisories ALPINE-CVE-2022-38476

Alpine secdb © Alpine Linux, from https://secdb.alpinelinux.org via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

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-2022-38476 updated cvss 7.5

Mozilla: Data race and potential use-after-free in PK11_ChangePW

  • Red Hat Enterprise Linux 6 firefox, thunderbird
    affected: no fix planned “Out of support scope”
  • Red Hat Enterprise Linux AppStream (v. 8) firefox 91.13.0-1.el8_6, thunderbird 91.13.0-1.el8_6
    fixed: vendor fix RHSA-2022:6175
  • Red Hat Enterprise Linux AppStream (v. 9) firefox 91.13.0-1.el9_0, thunderbird 91.13.0-1.el9_0
    fixed: vendor fix RHSA-2022:6174
  • Red Hat Enterprise Linux AppStream E4S (v. 8.1) firefox 91.13.0-1.el8_1, thunderbird 91.13.0-1.el8_1
    fixed: vendor fix RHSA-2022:6178
  • Red Hat Enterprise Linux AppStream EUS (v. 8.2) firefox 91.13.0-1.el8_2, thunderbird 91.13.0-1.el8_2
    fixed: vendor fix RHSA-2022:6177
  • Red Hat Enterprise Linux AppStream EUS (v.8.4) firefox 91.13.0-1.el8_4, thunderbird 91.13.0-1.el8_4
    fixed: vendor fix RHSA-2022:6176
  • Red Hat Enterprise Linux Client (v. 7) firefox 91.13.0-1.el7_9, thunderbird 91.13.0-1.el7_9 Red Hat Enterprise Linux Client Optional (v. 7) firefox 91.13.0-1.el7_9 Red Hat Enterprise Linux Server (v. 7) firefox 91.13.0-1.el7_9 Red Hat Enterprise Linux Server Optional (v. 7) firefox 91.13.0-1.el7_9, thunderbird 91.13.0-1.el7_9 Red Hat Enterprise Linux Workstation (v. 7) firefox 91.13.0-1.el7_9, thunderbird 91.13.0-1.el7_9 Red Hat Enterprise Linux Workstation Optional (v. 7) firefox 91.13.0-1.el7_9
    fixed: vendor fix RHSA-2022:6179

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

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
total
Assessed
18 mo ago

Exploit prediction

0.86% chance of exploitation in the next 30 days, higher than 58% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CISA ADP 3.1 7.5 CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H
NVD 3.1 7.5 CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H
CNA 3.1 7.5 CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H

Affected products

  • Mozilla Firefox ESR
  • Mozilla Thunderbird

Classification

Weakness

References

Sources

Fencer Vulns 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.