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Fencer Vulns
medium 5.5

CVE-2021-38208 json

net/nfc/llcp_sock.c in the Linux kernel before 5.12.10 allows local unprivileged users to cause a denial of service (NULL pointer dereferen…

published 2021-08-08 5 y ago modified 2026-06-17 4 mo ago also EUVD-2021-24666

cvss
5.5
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
0.5%
EPSS 0.5% chance of exploitation in 30 days, percentile 42%
public exploits
0
none known

Summary

net/nfc/llcp_sock.c in the Linux kernel before 5.12.10 allows local unprivileged users to cause a denial of service (NULL pointer dereference and BUG) by making a getsockname call after a certain type of failure of a bind call.

Patch / fix

  • linux linux_kernel 5.12.10
  • linux Debian 14, Debian 13, Debian 12 5.10.46-1

debian advisories DEBIAN-CVE-2021-38208

  • linux Ubuntu 18.04 LTS 4.15.0-154.161
  • linux Ubuntu 20.04 LTS 5.4.0-81.91
  • linux-aws Ubuntu 18.04 LTS 4.15.0-1110.117
  • linux-aws Ubuntu 20.04 LTS 5.4.0-1055.58
  • linux-gcp Ubuntu 20.04 LTS 5.4.0-1051.55
  • linux-gke Ubuntu 20.04 LTS 5.4.0-1051.54
  • linux-kvm Ubuntu 18.04 LTS 4.15.0-1098.100
  • linux-kvm Ubuntu 20.04 LTS 5.4.0-1045.47

ubuntu advisories UBUNTU-CVE-2021-38208

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 for SAP 15 SP1, SLES 15 SP1-LTSS, SLES 15 SP1-BCL +3 more 4.12.14-150100.197.114.2
  • kernel-source SLES for SAP 15 SP1, SLES 15 SP1-LTSS, SLES 15 SP1-BCL +3 more 4.12.14-150100.197.114.2
  • kernel-default SLES for SAP 15 SP1, SLES 15 SP1-LTSS, SLES 15 SP1-BCL +7 more 4.12.14-150100.197.114.2
  • kernel-vanilla openSUSE Leap 15.4, openSUSE Leap 15.3 4.12.14-150100.197.114.2
  • kernel-kvmsmall openSUSE Leap 15.4, openSUSE Leap 15.3 4.12.14-150100.197.114.2
  • kernel-zfcpdump SLES 15 SP1-LTSS, openSUSE Leap 15.4, openSUSE Leap 15.3 4.12.14-150100.197.114.2
  • kernel-obs-build SLES for SAP 15 SP1, SLES 15 SP1-LTSS, SLES 15 SP1-BCL +3 more 4.12.14-150100.197.114.2
  • kernel-syms SLES for SAP 15, SLES 15-LTSS, SLE High Performance Computing 15-LTSS +1 more 4.12.14-150000.150.92.2

suse advisories SUSE-SU-2022:2111-1SUSE-SU-2022:2103-1SUSE-SU-2022:2083-1SUSE-SU-2022:2082-1SUSE-SU-2022:2077-1SUSE-SU-2022:1687-1

  • kernel CBL-Mariner 2.0 5.10.78.1-1

azure linux advisories AZL-6592

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

  • linux Arch Linux 5.12.10.arch1-1
  • linux-zen Arch Linux 5.12.10.zen1-1
  • linux-hardened Arch Linux 5.12.10.hardened1-1
  • linux-lts Arch Linux 5.10.43-1

arch linux advisories AVG-2063AVG-2064AVG-2065AVG-2066

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-2021-38208 updated cvss 5.5

kernel: NULL pointer dereference in net/nfc/llcp_sock.c by making a getsockname call after a certain type of failure of a bind call

  • Red Hat Enterprise Linux 7 perf, kernel, kernel-alt, python-perf, kernel-kdump, kernel-tools, +3 more
    affected: workaround, no fix planned “Out of support scope”
  • Red Hat Enterprise Linux 6 perf, kernel, python-perf, kernel-kdump, kernel-firmware, kernel-bootwrapper, +1 more Red Hat Enterprise Linux 7 kernel, bpftool, kernel-rt, kernel-rt-kvm, kernel-rt-trace, kernel-rt-debug-kvm, +1 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

0.49% chance of exploitation in the next 30 days, higher than 42% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • github.com https://github.com/torvalds/linux/commit/4ac06a1e013cf5fdd963317ffd3b968560f33bba referenced PoC, tagged "exploit" by a source, unverified

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:N/I:N/A:H
NVD 2.0 2.1 AV:L/AC:L/Au:N/C:N/I:N/A:P

Classification

Weakness
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.