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Fencer Vulns
medium 5.5

CVE-2021-45095 json

pep_sock_accept in net/phonet/pep.c in the Linux kernel through 5.15.8 has a refcount leak.

published 2021-12-16 4 y ago modified 2026-06-17 4 mo ago also EUVD-2021-31886

cvss
5.5
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
0.4%
EPSS 0.4% chance of exploitation in 30 days, percentile 30%
public exploits
0
none known

Summary

pep_sock_accept in net/phonet/pep.c in the Linux kernel through 5.15.8 has a refcount leak.

Patch / fix

  • linux Debian 14, Debian 13, Debian 12 5.15.15-1

debian advisories DEBIAN-CVE-2021-45095

  • linux Ubuntu 18.04 LTS 4.15.0-173.182
  • linux Ubuntu 20.04 LTS 5.4.0-105.119
  • linux-aws Ubuntu 18.04 LTS 4.15.0-1124.133
  • linux-aws Ubuntu 20.04 LTS 5.4.0-1069.73
  • linux-gcp Ubuntu 20.04 LTS 5.4.0-1068.72
  • linux-gke Ubuntu 20.04 LTS 5.4.0-1066.69
  • linux-ibm Ubuntu 20.04 LTS 5.4.0-1018.20
  • linux-kvm Ubuntu 18.04 LTS 4.15.0-1110.113

ubuntu advisories UBUNTU-CVE-2021-45095

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-azure SLES for SAP 12 SP5, SLES 12 SP5 4.12.14-16.91.1
  • kernel-syms-azure SLES for SAP 12 SP5, SLES 12 SP5 4.12.14-16.91.1
  • kernel-source-azure SLES for SAP 12 SP5, SLES 12 SP5 4.12.14-16.91.1
  • kernel-syms SLES for SAP 12 SP5, SLES 12 SP5 4.12.14-122.113.1
  • kernel-source SLES for SAP 12 SP5, SLES 12 SP5 4.12.14-122.113.1
  • kernel-default SLES for SAP 12 SP5, SLES 12 SP5, SLE Workstation Extension 12 SP5 +2 more 4.12.14-122.113.1
  • kernel-obs-build SLE Software Development Kit 12 SP5 4.12.14-122.113.1
  • kernel-rt SLE Real Time 12 SP5 4.12.14-10.78.1

suse advisories SUSE-SU-2022:0765-1SUSE-SU-2022:0767-1SUSE-SU-2022:14905-1SUSE-SU-2022:0555-1SUSE-SU-2022:0544-1SUSE-SU-2022:0543-1

  • dtb-aarch64 openSUSE Leap 15.3 5.3.18-150300.59.49.1
  • kernel-64kb openSUSE Leap 15.3 5.3.18-150300.59.49.1
  • kernel-syms openSUSE Leap 15.3 5.3.18-150300.59.49.1
  • kernel-obs-qa openSUSE Leap 15.3 5.3.18-150300.59.49.1
  • kernel-source openSUSE Leap 15.3 5.3.18-150300.59.49.1
  • kernel-default openSUSE Leap 15.3 5.3.18-150300.59.49.1
  • kernel-preempt openSUSE Leap 15.3 5.3.18-150300.59.49.1
  • kernel-kvmsmall openSUSE Leap 15.3 5.3.18-150300.59.49.1

opensuse advisories openSUSE-SU-2022:0370-1openSUSE-SU-2022:0366-1openSUSE-SU-2022:0363-1

  • kernel CBL-Mariner 2.0 5.15.18.1-1

azure linux advisories AZL-7033

Azure Linux vulnerability data, Copyright (c) Microsoft Corporation, from https://github.com/microsoft/AzureLinuxVulnerabilityData via OSV, under the MIT licence; changed: normalised to fixed package versions per release. MIT

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-2021-45095 updated cvss 5.5

kernel: refcount leak in pep_sock_accept() in net/phonet/pep.c

  • Red Hat Enterprise Linux 6 perf, kernel, python-perf, kernel-kdump, kernel-firmware, kernel-bootwrapper, +1 more
    affected: no fix planned “Out of support scope”
  • 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, +82 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

0.36% chance of exploitation in the next 30 days, higher than 30% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
NVD 3.1 5.5 CVSS:3.1/AV:L/AC:L/PR:L/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

Classification

Weakness
  • CWE-200 Exposure of Sensitive Information to an Unauthorized Actor
Technology feeds

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.