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Fencer Vulns
medium 5.5

CVE-2021-46283 json

nf_tables_newset in net/netfilter/nf_tables_api.c in the Linux kernel before 5.12.13 allows local users to cause a denial of service (NULL…

published 2022-01-11 4 y ago modified 2026-06-17 4 mo ago also EUVD-2021-32972

cvss
5.5
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
0.3%
EPSS 0.3% chance of exploitation in 30 days, percentile 25%
public exploits
0
none known

Summary

nf_tables_newset in net/netfilter/nf_tables_api.c in the Linux kernel before 5.12.13 allows local users to cause a denial of service (NULL pointer dereference and general protection fault) because of the missing initialization for nft_set_elem_expr_alloc. A local user can set a netfilter table expression in their own namespace.

Patch / fix

  • linux linux_kernel 5.12.13
  • linux Debian 14, Debian 13, Debian 12 5.14.6-1

debian advisories DEBIAN-CVE-2021-46283

  • linux-aws-5.11 Ubuntu 20.04 LTS 5.11.0-1017.18~20.04.1
  • linux-gcp-5.11 Ubuntu 20.04 LTS 5.11.0-1018.20~20.04.2
  • linux-oem-5.10 Ubuntu 20.04 LTS 5.10.0-1050.52
  • linux-azure-5.11 Ubuntu 20.04 LTS 5.11.0-1015.16~20.04.1
  • linux-riscv-5.11 Ubuntu 20.04 LTS 5.11.0-1018.19~20.04.2
  • linux-oracle-5.11 Ubuntu 20.04 LTS 5.11.0-1017.18~20.04.1

ubuntu advisories UBUNTU-CVE-2021-46283

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 Micro 5.1, Real Time Module 15 SP3 5.3.18-150300.71.1
  • kernel-syms-rt Real Time Module 15 SP3 5.3.18-150300.71.1
  • kernel-rt_debug Real Time Module 15 SP3 5.3.18-150300.71.1
  • kernel-source-rt Real Time Module 15 SP3 5.3.18-150300.71.1
  • kernel-64kb SLE Module for Basesystem 15 SP3 5.3.18-150300.59.43.1
  • kernel-syms SLE Module for Development Tools 15 SP3 5.3.18-150300.59.43.1
  • kernel-source SLE Module for Development Tools 15 SP3, SLE Module for Basesystem 15 SP3 5.3.18-150300.59.43.1
  • kernel-default SLE Workstation Extension 15 SP3, SLE Module for Legacy 15 SP3, SLE Module for Basesystem 15 SP3 +3 more 5.3.18-150300.59.43.1

suse advisories SUSE-SU-2022:0288-1SUSE-SU-2022:0198-1SUSE-SU-2022:0169-1

  • dtb-aarch64 openSUSE Leap 15.3 5.3.18-150300.59.43.1
  • kernel-64kb openSUSE Leap 15.3 5.3.18-150300.59.43.1
  • kernel-syms openSUSE Leap 15.3 5.3.18-150300.59.43.1
  • kernel-obs-qa openSUSE Leap 15.3 5.3.18-150300.59.43.1
  • kernel-source openSUSE Leap 15.3 5.3.18-150300.59.43.1
  • kernel-default openSUSE Leap 15.3 5.3.18-150300.59.43.1
  • kernel-preempt openSUSE Leap 15.3 5.3.18-150300.59.43.1
  • kernel-kvmsmall openSUSE Leap 15.3 5.3.18-150300.59.43.1

opensuse advisories openSUSE-SU-2022:0198-1openSUSE-SU-2022:0169-1

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-2021-46283 updated cvss 5.5

kernel: DoS in nf_tables_newset in net/netfilter/nf_tables_api.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, +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

0.33% chance of exploitation in the next 30 days, higher than 25% 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:N/I:N/A:H
NVD 2.0 4.9 AV:L/AC:L/Au:N/C:N/I:N/A:C

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.