CVE-2021-45485: linux linux_kernel

Analyzed

AliasesUBUNTU-CVE-2021-45485DEBIAN-CVE-2021-45485

Published 25-12-2021Last modified 04-08-2024

Vulnerability summary

CVE-2021-45485 is a high (CVSS 7.5) vulnerability in linux linux_kernel. EPSS estimates a 3.82% chance of exploitation in the next 30 days, higher than 90% of scored vulnerabilities.

Priority

Prioritisesevere

Severe, CVSS 7.5 (NVD); no exploitation reported by the 5 checked sources; EPSS 4% (FIRST, 03-11-2026)

Source freshness unavailable

How is this decided?

CVSS score

7.5/10

010

High · v3.1 (NVD)

EPSS score

3.82%

0%100%

Low · +0.21 pp in 30 days

KEVNot listedNot listed by any tracked catalog.

RansomwareNot flaggedNo ransomware use recorded.

Public exploits0No public exploits recorded

Timeline

25-12-2021
PublishedVulnerability first disclosed.
04-08-2024
Last modifiedVulnerability information updated.

Description

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 hash table which, although big, doesn't properly consider that IPv6-based attackers can typically choose among many IPv6 source addresses.

CVSS metrics

4 scores · 3 sources · 2 versions

v3.17.5v2.05.0

EPSS trend

Probability

3.82%

Chance of exploitation in the next 30 days

Percentile

90%

Versus all other CVEs

30-day change

Increase +0.21 pp

From 3.62% on 04-10-2026

04-10-202603-11-2026

Known exploited

Compare KEV catalogs

CISA KEV

Not in the CISA KEV catalog.

ENISA CNW

Not in the ENISA CNW catalog.

CIRCL

Not in the CIRCL catalog.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

CWE-327Use of a Broken or Risky Cryptographic AlgorithmThe product uses a broken or risky cryptographic algorithm or protocol.

Affected systems

Version check

Known conditions: network-reachable, no authentication, no user interaction (CVSS vector). Other conditions: not stated in public data.

Ubuntu61 products

linuxAll versions (No fix recorded) | < 4.4.0-219.252 | < 4.15.0-156.163 | < 5.4.0-84.94
linux-aws< 4.4.0-1099.104 | < 4.4.0-1135.149 | < 4.15.0-1111.118 | < 5.4.0-1056.59
linux-aws-5.0All versions (No fix recorded)
linux-aws-5.11< 5.11.0-1019.20~20.04.1
linux-aws-5.3All versions (No fix recorded)

linux-aws-5.4< 5.4.0-1056.59~18.04.1
linux-aws-5.8All versions (No fix recorded)
linux-aws-fips< 4.15.0-2053.55 | All versions (No fix recorded) | < 5.4.0-1069.73+fips2
linux-aws-hwe< 4.15.0-1111.118~16.04.1
linux-azure< 4.15.0-1123.136~14.04.1 | < 4.15.0-1123.136~16.04.1 | All versions (No fix recorded) | < 5.4.0-1058.60
linux-azure-4.15< 4.15.0-1123.136
linux-azure-5.11< 5.11.0-1017.18~20.04.1
linux-azure-5.3All versions (No fix recorded)
linux-azure-5.4< 5.4.0-1058.60~18.04.1
linux-azure-5.8All versions (No fix recorded)
linux-azure-edgeAll versions (No fix recorded)
linux-azure-fde-5.15< 5.15.0-1114.123~20.04.1
linux-azure-fips< 4.15.0-2035.39 | All versions (No fix recorded) | < 5.4.0-1073.76+fips1
linux-bluefield< 5.4.0-1019.22
linux-dell300x< 4.15.0-1027.32
linux-fips< 4.4.0-1069.75 | All versions (No fix recorded) | < 4.15.0-1069.78 | < 5.4.0-1033.38
linux-gcp< 4.15.0-1108.122~16.04.1 | All versions (No fix recorded) | < 5.4.0-1052.56
linux-gcp-4.15< 4.15.0-1108.122
linux-gcp-5.11< 5.11.0-1020.22~20.04.1
linux-gcp-5.3All versions (No fix recorded)
linux-gcp-5.4< 5.4.0-1052.56~18.04.1
linux-gcp-5.8All versions (No fix recorded)
linux-gcp-fips< 4.15.0-2018.20 | All versions (No fix recorded) | < 5.4.0-1067.71~20.04.1
linux-gke< 5.4.0-1052.55
linux-gke-4.15All versions (No fix recorded)
linux-gke-5.4< 5.4.0-1052.55~18.04.1
linux-gkeop< 5.4.0-1023.24
linux-gkeop-5.4< 5.4.0-1023.24~18.04.1
linux-hwe< 4.15.0-156.163~16.04.1 | All versions (No fix recorded)
linux-hwe-5.11All versions (No fix recorded)
linux-hwe-5.4< 5.4.0-84.94~18.04.1
linux-hwe-5.8All versions (No fix recorded)
linux-hwe-edgeAll versions (No fix recorded)
linux-intel-5.13All versions (No fix recorded)
linux-intel-iot-realtimeAll versions (No fix recorded)
linux-kvm< 4.4.0-1100.109 | < 4.15.0-1099.101 | < 5.4.0-1046.48
linux-lts-xenial< 4.4.0-219.252~14.04.1
linux-oemAll versions (No fix recorded)
linux-oem-5.10< 5.10.0-1049.51
linux-oem-5.13< 5.13.0-1014.18
linux-oem-5.6All versions (No fix recorded)
linux-oracle< 4.15.0-1080.88~16.04.1 | < 4.15.0-1080.88 | < 5.4.0-1054.58
linux-oracle-5.0All versions (No fix recorded)
linux-oracle-5.11< 5.11.0-1019.20~20.04.1
linux-oracle-5.3All versions (No fix recorded)
linux-oracle-5.4< 5.4.0-1054.58~18.04.1
linux-oracle-5.8All versions (No fix recorded)
linux-raspi< 5.4.0-1043.47
linux-raspi-5.4< 5.4.0-1043.47~18.04.1
linux-raspi-realtimeAll versions (No fix recorded)
linux-raspi2< 4.15.0-1095.101 | All versions (No fix recorded)
linux-realtimeAll versions (No fix recorded)
linux-riscvAll versions (No fix recorded)
linux-riscv-5.11< 5.11.0-1020.21~20.04.1
linux-riscv-5.8All versions (No fix recorded)
linux-snapdragon< 4.15.0-1112.121

Show all 61

Netapp22 products

Show all 22

Oracle3 products

Debian1 product

linux< 5.14.6-1

Linux1 product

linux_kernel< 4.4.276 | ≥ 4.5, < 4.9.276 | ≥ 4.10, < 4.14.240 | ≥ 4.15, < 4.19.198 | ≥ 4.20, < 5.4.133 | ≥ 5.5, < 5.10.51 | ≥ 5.11, < 5.12.18 | ≥ 5.13, < 5.13.3

5 vendors · 88 products