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CVE-2021-45486· NVD / CVE Program· CNA mitre

In the IPv4 implementation in the Linux kernel before 5.12.4, net/ipv4/route.c has an information leak because the hash table is very small.

Noroxi assessment

Priority: Monitor (action score 14/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 0.39% (FIRST EPSS).
  • Someone on the same network segment can trigger it. A low-privileged account is enough. No user action is required. No special conditions are required; it is repeatable.
  • Fixed version: linux (Debian:12) 5.10.38-1; dtb-aarch64 (openSUSE:Leap 15.3) 5.3.18-150300.59.43.1, 5.3.18-59.40.1; kernel-64kb (openSUSE:Leap 15.3) 5.3.18-59.40.1, 5.3.18-150300.59.43.1.
  • Mentioned 2 times in Turkish national cyber security advisories (siberguvenlik.gov.tr).

Low priority for now. Upgrade to linux (Debian:12) 5.10.38-1; dtb-aarch64 (openSUSE:Leap 15.3) 5.3.18-150300.59.43.1, 5.3.18-59.40.1; kernel-64kb (openSUSE:Leap 15.3) 5.3.18-59.40.1, 5.3.18-150300.59.43.1 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

LowCVSS 3.5 · v3.1—No exploit Fix available
Published
Dec 24, 2021
Updated
Jun 17, 2026
EPSS
0.3% · 32th percentile

Report tools

JSON

Action score

14

Monitor

Low priority for now.

CVSS
14 / 40 · 3.5 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.3%

Get told when this record changes

  • Not in KEV: no record of exploitation in the wild
  • No public exploit code on record
  • A fix has been released

If any of these changes, we'll tell you in the daily email digest.

Follow CVE-2021-45486

When you'll hear from us

  • when it enters CISA KEV
  • when exploit code appears or is weaponized
  • when the record is updated (including a fixed version)
  • when EPSS rises 20 points in a week

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

VendorProduct
linuxlinux kernel
oraclecommunications cloud native core binding support function
oraclecommunications cloud native core network exposure function
oraclecommunications cloud native core policy

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Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • linux linux kernelbefore 5.12.4
  • oracle communications cloud native core binding support function22.1.3
  • oracle communications cloud native core network exposure function22.1.1
  • oracle communications cloud native core policy22.2.0

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
Debian:12linuxbefore 5.10.38-15.10.38-1
openSUSE:Leap 15.3dtb-aarch64before 5.3.18-150300.59.43.15.3.18-150300.59.43.1
openSUSE:Leap 15.3dtb-aarch64before 5.3.18-59.40.15.3.18-59.40.1
openSUSE:Leap 15.3kernel-64kbbefore 5.3.18-59.40.15.3.18-59.40.1
openSUSE:Leap 15.3kernel-64kbbefore 5.3.18-150300.59.43.15.3.18-150300.59.43.1
openSUSE:Leap 15.3kernel-azurebefore 5.3.18-150300.38.37.15.3.18-150300.38.37.1
openSUSE:Leap 15.3kernel-azurebefore 5.3.18-38.34.15.3.18-38.34.1
openSUSE:Leap 15.3kernel-debugbefore 5.3.18-150300.59.43.15.3.18-150300.59.43.1
openSUSE:Leap 15.3kernel-debugbefore 5.3.18-59.40.15.3.18-59.40.1
openSUSE:Leap 15.3kernel-defaultbefore 5.3.18-150300.59.43.15.3.18-150300.59.43.1
openSUSE:Leap 15.3kernel-defaultbefore 5.3.18-59.40.15.3.18-59.40.1
openSUSE:Leap 15.3kernel-default-basebefore 5.3.18-59.40.1.18.25.15.3.18-59.40.1.18.25.1
openSUSE:Leap 15.3kernel-default-basebefore 5.3.18-150300.59.43.1.150300.18.27.15.3.18-150300.59.43.1.150300.18.27.1
openSUSE:Leap 15.3kernel-docsbefore 5.3.18-59.40.15.3.18-59.40.1
openSUSE:Leap 15.3kernel-docsbefore 5.3.18-150300.59.43.15.3.18-150300.59.43.1
openSUSE:Leap 15.3kernel-kvmsmallbefore 5.3.18-59.40.15.3.18-59.40.1
openSUSE:Leap 15.3kernel-kvmsmallbefore 5.3.18-150300.59.43.15.3.18-150300.59.43.1
openSUSE:Leap 15.3kernel-obs-buildbefore 5.3.18-59.40.15.3.18-59.40.1
openSUSE:Leap 15.3kernel-obs-buildbefore 5.3.18-150300.59.43.15.3.18-150300.59.43.1
openSUSE:Leap 15.3kernel-obs-qabefore 5.3.18-150300.59.43.15.3.18-150300.59.43.1
openSUSE:Leap 15.3kernel-obs-qabefore 5.3.18-59.40.15.3.18-59.40.1
openSUSE:Leap 15.3kernel-preemptbefore 5.3.18-59.40.15.3.18-59.40.1
openSUSE:Leap 15.3kernel-preemptbefore 5.3.18-150300.59.43.15.3.18-150300.59.43.1
openSUSE:Leap 15.3kernel-sourcebefore 5.3.18-150300.59.43.15.3.18-150300.59.43.1

+96

Same product

linux: all records

Other highest-scoring records for the same primary product.

  • CVE-2022-0847A flaw was found in the way the "flags" member of the new pipe buffer structure was lacking proper initialization in copy_page_to_iter_pipe KEV
    89Now
  • CVE-2021-22555Heap Out-Of-Bounds Write in Netfilter IP6T_SO_SET_REPLACEKEV
    85Now
  • CVE-2016-5195Race condition in mm/gup.c in the Linux kernel 2.x through 4.x before 4.8.3 allows local users to gain privileges by leveraging incorrect haKEV
    83Now

Published before and after this one in the same product

  • ← EarlierCVE-2021-45480Dec 24, 2021 · An issue was discovered in the Linux kernel before 5.15.11.
    22Monitor
  • ← EarlierCVE-2021-45485Dec 24, 2021 · In the IPv6 implementation in the Linux kernel before 5.13.3, net/ipv6/output_core.c has an information leak because of certain use of a has
    31Monitor
  • Later →CVE-2021-28714Jan 6, 2022 · Guest can force Linux netback driver to hog large amounts of kernel memory T[his CNA information record relates to multiple CVEs; the text e
    26Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
debian:linux5.10.38-1 · Debian:12Package registry (OSV)
opensuse:connman1.41-bp153.2.3.1 · openSUSE:Leap 15.3Package registry (OSV)
opensuse:dtb-aarch645.3.18-59.40.1 · openSUSE:Leap 15.3Package registry (OSV)
opensuse:kernel-64kb5.3.18-59.40.1 · openSUSE:Leap 15.3Package registry (OSV)
opensuse:kernel-azure5.3.18-38.34.1 · openSUSE:Leap 15.3Package registry (OSV)
opensuse:kernel-debug5.3.18-59.40.1 · openSUSE:Leap 15.3Package registry (OSV)
opensuse:kernel-default5.3.18-59.40.1 · openSUSE:Leap 15.3Package registry (OSV)
opensuse:kernel-default-base5.3.18-59.40.1.18.25.1 · openSUSE:Leap 15.3Package registry (OSV)
opensuse:kernel-docs5.3.18-59.40.1 · openSUSE:Leap 15.3Package registry (OSV)
opensuse:kernel-kvmsmall5.3.18-59.40.1 · openSUSE:Leap 15.3Package registry (OSV)
opensuse:kernel-source-azure5.3.18-38.34.1 · openSUSE:Leap 15.3Package registry (OSV)
opensuse:kernel-syms-azure5.3.18-38.34.1 · openSUSE:Leap 15.3Package registry (OSV)
red hat:bpftool0:4.18.0-305.65.1.el8_4 · Red Hat:rhel_eus:8.4::baseosPackage registry (OSV)
red hat:bpftool-debuginfo0:4.18.0-305.65.1.el8_4 · Red Hat:rhel_eus:8.4::baseosPackage registry (OSV)
red hat:kernel0:4.18.0-305.65.1.el8_4 · Red Hat:rhel_eus:8.4::baseosPackage registry (OSV)
red hat:kernel-abi-stablelists0:4.18.0-305.65.1.el8_4 · Red Hat:rhel_eus:8.4::baseosPackage registry (OSV)
red hat:kernel-core0:4.18.0-305.65.1.el8_4 · Red Hat:rhel_eus:8.4::baseosPackage registry (OSV)
red hat:kernel-debug0:4.18.0-305.65.1.el8_4 · Red Hat:rhel_eus:8.4::baseosPackage registry (OSV)
red hat:kernel-debug-core0:4.18.0-305.65.1.el8_4 · Red Hat:rhel_eus:8.4::baseosPackage registry (OSV)
red hat:kernel-debug-debuginfo0:4.18.0-305.65.1.el8_4 · Red Hat:rhel_eus:8.4::baseosPackage registry (OSV)
red hat:kernel-debug-devel0:4.18.0-305.65.1.el8_4 · Red Hat:rhel_eus:8.4::baseosPackage registry (OSV)
red hat:kernel-debug-modules0:4.18.0-305.65.1.el8_4 · Red Hat:rhel_eus:8.4::baseosPackage registry (OSV)
red hat:kernel-debug-modules-extra0:4.18.0-305.65.1.el8_4 · Red Hat:rhel_eus:8.4::baseosPackage registry (OSV)
red hat:kernel-debuginfo0:4.18.0-305.65.1.el8_4 · Red Hat:rhel_eus:8.4::baseosPackage registry (OSV)
suse:connman1.41-bp153.2.3.1 · SUSE:Package Hub 15 SP3Package registry (OSV)
suse:kernel-azure5.3.18-38.34.1 · SUSE:Linux Enterprise Module for Public Cloud 15 SP3Package registry (OSV)
suse:kernel-default4.12.14-122.106.1 · SUSE:Linux Enterprise High Availability Extension 12 SP5Package registry (OSV)
suse:kernel-docs4.12.14-122.106.1 · SUSE:Linux Enterprise Software Development Kit 12 SP5Package registry (OSV)
suse:kernel-obs-build4.12.14-122.106.1 · SUSE:Linux Enterprise Software Development Kit 12 SP5Package registry (OSV)
suse:kernel-rt5.3.18-68.1 · SUSE:Real Time Module 15 SP3Package registry (OSV)

+7

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

No nightly-computed relations.

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

National notice (Türkiye Cybersecurity Directorate / USOM)

Official security notices citing this record; remediation advice is on the agency's page.

All national notices →

Technical details

Attack conditions

  • Someone on the same network segment can trigger it.
  • A low-privileged account is enough.
  • No user action is required.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
low · data can be read
Integrity
none
Availability
none
Attack vector
Adjacent
Attack complexity
Low
Privileges required
Low
User interaction
None
Scope
Unchanged
Confidentiality impact
Low
Integrity impact
None
Availability impact
None

Weakness class (CWE)

CWE-327 · Use of a Broken or Risky Cryptographic Algorithm

CVSS vector

CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N

nvd-primary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

Change log

  1. Fix✗ → ✓

For records you follow, these changes also arrive as notifications. →

References

Show all references (3 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records