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Fencer Vulns
high 7.0

CVE-2021-39713 json

Product: AndroidVersions: Android kernelAndroid ID: A-173788806References: Upstream kernel

published 2022-03-16 4 y ago modified 2026-06-17 4 mo ago also EUVD-2021-26070

cvss
7.0
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
0.2%
EPSS 0.2% chance of exploitation in 30 days, percentile 10%
public exploits
0
none known

Summary

Product: AndroidVersions: Android kernelAndroid ID: A-173788806References: Upstream kernel

Patch / fix

  • linux Debian 14, Debian 13, Debian 12 5.2.6-1

debian advisories DEBIAN-CVE-2021-39713

  • linux-gcp Ubuntu 16.04 LTS 4.15.0-1014.14~16.04.1
  • linux-hwe Ubuntu 16.04 LTS 4.15.0-24.26~16.04.1
  • linux-azure Ubuntu 16.04 LTS 4.15.0-1013.13~16.04.2
  • linux-snapdragon Ubuntu 18.04 LTS 4.15.0-1053.57
  • linux Ubuntu Pro 14.04 LTS 3.13.0-190.241
  • linux Ubuntu Pro 16.04 LTS 4.4.0-224.257
  • linux-aws Ubuntu Pro 14.04 LTS 4.4.0-1104.109
  • linux-aws Ubuntu Pro 16.04 LTS 4.4.0-1140.154

ubuntu advisories UBUNTU-CVE-2021-39713

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

  • kernel-syms SLES 12 SP3-BCL 4.4.180-94.171.1
  • kernel-source SLES 12 SP3-BCL 4.4.180-94.171.1
  • kernel-default SLES 12 SP3-BCL 4.4.180-94.171.1
  • kernel-syms SLES 12 SP2-BCL 4.4.121-92.181.1
  • kernel-source SLES 12 SP2-BCL 4.4.121-92.181.1
  • kernel-default SLES 12 SP2-BCL 4.4.121-92.181.1
  • kernel-rt SLE Real Time 12 SP5 4.12.14-10.84.1
  • kernel-syms-rt SLE Real Time 12 SP5 4.12.14-10.84.1

suse advisories SUSE-SU-2023:0416-1SUSE-SU-2022:2840-1SUSE-SU-2022:2721-1SUSE-SU-2022:2285-1SUSE-SU-2022:1641-1SUSE-SU-2022:1598-1

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-2021-39713 updated cvss 7.0

kernel: race condition in the network scheduling subsystem could lead to an use-after-free

  • Red Hat Enterprise Linux 6 perf, kernel, python-perf, kernel-kdump, kernel-firmware, kernel-bootwrapper, +1 more Red Hat Enterprise Linux 7 perf, kernel, bpftool, kernel-rt, python-perf, kernel-kdump, +8 more
    affected: workaround, no fix planned “Out of support scope”
  • Red Hat Virtualization 4 redhat-virtualization-host-image-update
    affected: workaround, no fix available
  • Red Hat Enterprise Linux 8 perf, kernel, bpftool, kernel-rt, kernel-core, kernel-tools, +29 more Red Hat Enterprise Linux 9 rv, perf, rtla, kernel, bpftool, libperf, +83 more
    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

0.21% chance of exploitation in the next 30 days, higher than 10% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • packetstormsecurity.com http://packetstormsecurity.com/files/167386/Kernel-Live-Patch-Security-Notice-LSN-0086-1.html referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
NVD 3.1 7.0 CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
NVD 2.0 6.9 AV:L/AC:M/Au:N/C:C/I:C/A:C

Affected products

  • n/a Android

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.