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Fencer Vulns
medium 4.4

CVE-2021-39711 json

In bpf_prog_test_run_skb of test_run.c, there is a possible out of bounds read due to Incorrect Size Value.

published 2022-03-16 4 y ago modified 2026-06-17 4 mo ago also EUVD-2021-26068

cvss
4.4
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 4%
public exploits
0
none known

Summary

In bpf_prog_test_run_skb of test_run.c, there is a possible out of bounds read due to Incorrect Size Value. This could lead to local information disclosure with System execution privileges needed. User interaction is not needed for exploitation.Product: AndroidVersions: Android kernelAndroid ID: A-154175781References: Upstream kernel

Patch / fix

  • linux Debian 14, Debian 13, Debian 12 4.18.6-1

debian advisories DEBIAN-CVE-2021-39711

  • linux Ubuntu 18.04 LTS 4.15.0-169.177
  • linux-aws Ubuntu 18.04 LTS 4.15.0-1121.129
  • linux-kvm Ubuntu 18.04 LTS 4.15.0-1107.109
  • linux-oracle Ubuntu 18.04 LTS 4.15.0-1087.95
  • linux-raspi2 Ubuntu 18.04 LTS 4.15.0-1103.110
  • linux-dell300x Ubuntu 18.04 LTS 4.15.0-1035.40
  • linux-gcp-4.15 Ubuntu 18.04 LTS 4.15.0-1116.130
  • linux-azure-4.15 Ubuntu 18.04 LTS 4.15.0-1131.144

ubuntu advisories UBUNTU-CVE-2021-39711

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-rt SLE Real Time 12 SP5 4.12.14-10.94.1
  • kernel-syms-rt SLE Real Time 12 SP5 4.12.14-10.94.1
  • kernel-rt_debug SLE Real Time 12 SP5 4.12.14-10.94.1
  • kernel-source-rt SLE Real Time 12 SP5 4.12.14-10.94.1
  • kernel-syms SLES for SAP 12 SP5, SLES 12 SP5 4.12.14-122.124.2
  • kernel-source SLES for SAP 12 SP5, SLES 12 SP5 4.12.14-122.124.2
  • kernel-default SLES for SAP 12 SP5, SLES 12 SP5, SLE Workstation Extension 12 SP5 +2 more 4.12.14-122.124.3
  • kernel-obs-build SLE Software Development Kit 12 SP5 4.12.14-122.124.3

suse advisories SUSE-SU-2022:2629-1SUSE-SU-2022:2116-1SUSE-SU-2022:2111-1SUSE-SU-2022:2103-1SUSE-SU-2022:2083-1SUSE-SU-2022:2080-1

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-2021-39711 updated cvss 4.4

kernel: out-of-bounds read due to Incorrect size value in bpf_prog_test_run_skb() of test_run.c

  • 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 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

0.15% chance of exploitation in the next 30 days, higher than 4% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
NVD 3.1 4.4 CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:N/A:N
NVD 2.0 2.1 AV:L/AC:L/Au:N/C:P/I:N/A:N

Affected products

  • n/a Android

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.