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Fencer Vulns
critical 9.8

CVE-2021-32810 json

Data race in crossbeam-deque

published 2021-07-30 5 y ago modified 2026-10-12 27 d ago also GHSA-pqqp-xmhj-wgcw , RUSTSEC-2021-0093 , EUVD-2021-1828

cvss
9.8
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
1.9%
EPSS 1.9% chance of exploitation in 30 days, percentile 79%
public exploits
0
none known

Summary

crossbeam-deque is a package of work-stealing deques for building task schedulers when programming in Rust. In versions prior to 0.7.4 and 0.8.0, the result of the race condition is that one or more tasks in the worker queue can be popped twice instead of other tasks that are forgotten and never popped. If tasks are allocated on the heap, this can cause double free and a memory leak. If not, this still can cause a logical bug. Crates using `Stealer::steal`, `Stealer::steal_batch`, or `Stealer::steal_batch_and_pop` are affected by this issue. This has been fixed in crossbeam-deque 0.8.1 and 0.7.4.

Patch / fix

  • crates.io crossbeam-deque 0.7.4, 0.8.1
  • crossbeam_project crossbeam 0.7.4, 0.8.1
  • rust-crossbeam-deque Debian 14, Debian 13, Debian 12 0.7.4-1

debian advisories DEBIAN-CVE-2021-32810

  • firefox Ubuntu 18.04 LTS 93.0+build1-0ubuntu0.18.04.1
  • firefox Ubuntu 20.04 LTS 93.0+build1-0ubuntu0.20.04.1

ubuntu advisories UBUNTU-CVE-2021-32810

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 7 91.2.0-1.el7_9
  • thunderbird RHEL 8 91.2.0-1.el8_4
  • firefox RHEL 7 91.2.0-4.el7_9
  • firefox RHEL 8 91.2.0-4.el8_4
  • thunderbird RHEL 8.2 EUS 91.2.0-1.el8_2
  • thunderbird RHEL 8.1 EUS 91.2.0-1.el8_1
  • firefox RHEL 8.1 EUS 91.2.0-4.el8_1
  • firefox RHEL 8.2 EUS 91.2.0-4.el8_2

red hat advisories RHSA-2021:3839RHSA-2021:3841RHSA-2021:3838RHSA-2021:3840RHSA-2021:3791RHSA-2021:3757

  • MozillaThunderbird SLE Workstation Extension 15 SP3, SLE Workstation Extension 15 SP2 91.4.0-8.45.2
  • MozillaFirefox SLE Module for Desktop Applications 15 SP3, SLE Module for Desktop Applications 15 SP2 91.2.0-8.54.1
  • MozillaFirefox-branding-SLE SLE Module for Desktop Applications 15 SP3, SLE Module for Desktop Applications 15 SP2 91-9.5.1
  • MozillaFirefox SLES for SAP 12 SP5, SLES for SAP 12 SP4, SLES for SAP 12 SP3 +11 more 91.2.0-112.74.1
  • MozillaFirefox SLES for SAP 15 SP1, SLES for SAP 15, SLES 15-LTSS +7 more 91.2.0-3.155.2
  • MozillaFirefox-branding-SLE SLES for SAP 15 SP1, SLES for SAP 15, SLES 15-LTSS +7 more 91-4.19.1
  • MozillaFirefox SLES 11 SP4-LTSS 91.2.0-78.143.1
  • MozillaFirefox-branding-SLED SLES 11 SP4-LTSS 91-21.18.1

suse advisories SUSE-SU-2021:4150-1SUSE-SU-2021:14826-1SUSE-SU-2021:3451-1SUSE-SU-2021:3446-1SUSE-SU-2021:3331-1

  • firefox-esr openSUSE Tumbleweed 128.5.1-1.1
  • MozillaFirefox openSUSE Tumbleweed 93.0-1.1
  • MozillaThunderbird openSUSE Tumbleweed 91.2.0-1.1
  • MozillaThunderbird openSUSE Leap 15.2 91.4.0-lp152.2.52.1
  • MozillaThunderbird openSUSE Leap 15.3 91.4.0-8.45.2
  • MozillaFirefox openSUSE Leap 15.2 91.2.0-lp152.2.67.1
  • rust-cbindgen openSUSE Leap 15.2 0.19.0-lp152.2.7.1
  • MozillaFirefox openSUSE Leap 15.3 91.2.0-8.54.1

opensuse advisories openSUSE-SU-2024:14572-1openSUSE-SU-2024:11570-1openSUSE-SU-2024:11571-1openSUSE-SU-2021:1635-1openSUSE-SU-2021:4150-1openSUSE-SU-2021:1367-1

  • thunderbird Rocky Linux 8 91.2.0-1.el8_4
  • firefox Rocky Linux 8 91.2.0-4.el8_4

rocky linux advisories RLSA-2021:3838RLSA-2021:3755

  • firefox Alpine 3.23, Alpine 3.22, Alpine 3.21 +6 more 93.0-r0
  • librewolf Alpine 3.24, Alpine 3.23, Alpine 3.22 +1 more 93.0-r0
  • firefox-esr Alpine 3.23, Alpine 3.22, Alpine 3.21 +6 more 91.2.0-r0
  • thunderbird Alpine 3.23, Alpine 3.22, Alpine 3.21 +5 more 91.3.2-r0

alpine advisories ALPINE-CVE-2021-32810

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

  • firefox Arch Linux 93.0-1
  • thunderbird Arch Linux 91.2.0-1

arch linux advisories AVG-2443AVG-2459

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-2021-32810 updated cvss 9.8

rust-crossbeam-deque: race condition may lead to double free

  • Red Hat Enterprise Linux 6 firefox, thunderbird
    affected: no fix planned “Out of support scope”
  • Red Hat Enterprise Linux AppStream (v. 8) firefox 91.2.0-4.el8_4, thunderbird 91.2.0-1.el8_4
    fixed: vendor fix RHSA-2021:3755
  • Red Hat Enterprise Linux AppStream EUS (v. 8.1) firefox 91.2.0-4.el8_1, thunderbird 91.2.0-1.el8_1
    fixed: vendor fix RHSA-2021:3757
  • Red Hat Enterprise Linux AppStream EUS (v. 8.2) firefox 91.2.0-4.el8_2, thunderbird 91.2.0-1.el8_2
    fixed: vendor fix RHSA-2021:3756
  • Red Hat Enterprise Linux Client (v. 7) firefox 91.2.0-4.el7_9, thunderbird 91.2.0-1.el7_9 Red Hat Enterprise Linux Client Optional (v. 7) firefox 91.2.0-4.el7_9 Red Hat Enterprise Linux Server (v. 7) firefox 91.2.0-4.el7_9 Red Hat Enterprise Linux Server Optional (v. 7) firefox 91.2.0-4.el7_9, thunderbird 91.2.0-1.el7_9 Red Hat Enterprise Linux Workstation (v. 7) firefox 91.2.0-4.el7_9, thunderbird 91.2.0-1.el7_9 Red Hat Enterprise Linux Workstation Optional (v. 7) firefox 91.2.0-4.el7_9
    fixed: vendor fix RHSA-2021:3791

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

1.91% chance of exploitation in the next 30 days, higher than 79% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 9.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
NVD 3.1 9.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
NVD 2.0 6.8 AV:N/AC:M/Au:N/C:P/I:P/A:P
GitHub 3.1 9.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
OSV 3.1 9.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected packages

ecosystem package affected fixed in
crates.io crossbeam-deque
<0.7.4
>=0.8.0, <0.8.1
>=0.0.0-0, <0.7.4
0.7.4
0.8.1

Affected products

  • crossbeam-rs crossbeam

Classification

Weakness
  • CWE-362 Concurrent Execution using Shared Resource with Improper Synchronization

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.