UBUNTU-CVE-2021-45486

MEDIUM5.5

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.

Published Dec 25, 2021

Modified 6 months ago

Fix available

Details

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.

Affected Packages(206 packages)

linux

Ubuntu 18.04 LTS

Affected versions:

4.13.0-16.194.13.0-17.204.13.0-25.294.13.0-32.354.15.0-10.114.15.0-101.1024.15.0-106.1074.15.0-108.1094.15.0-109.1104.15.0-111.112+70 more

Fixed in:

4.15.0-156.163

linux

Ubuntu 20.04 LTS

Affected versions:

5.3.0-18.195.3.0-24.265.4.0-18.225.4.0-21.255.4.0-24.285.4.0-25.295.4.0-26.305.4.0-28.325.4.0-29.335.4.0-31.35+27 more

Fixed in:

5.4.0-77.86

linux

Ubuntu 25.04

Fixed in:

6.11.0-8.8

linux

Ubuntu Pro 14.04 LTS

Affected versions:

3.11.0-12.193.12.0-1.33.12.0-2.53.12.0-2.73.12.0-3.83.12.0-3.93.12.0-4.103.12.0-4.123.12.0-5.133.12.0-7.15+170 more

linux

Ubuntu Pro 16.04 LTS

Affected versions:

4.2.0-16.194.2.0-17.214.2.0-19.234.3.0-1.104.3.0-2.114.3.0-5.164.3.0-6.174.3.0-7.184.4.0-10.254.4.0-101.124+128 more

Fixed in:

4.4.0-223.256

linux

Ubuntu 24.04 LTS

Fixed in:

6.5.0-9.9

linux

Ubuntu 16.04 LTS

Affected versions:

4.2.0-16.194.2.0-17.214.2.0-19.234.3.0-1.104.3.0-2.114.3.0-5.164.3.0-6.174.3.0-7.184.4.0-10.254.4.0-101.124+128 more

linux

Ubuntu 22.04 LTS

Fixed in:

5.13.0-19.19

linux-aws

Ubuntu 18.04 LTS

Affected versions:

4.15.0-1001.14.15.0-1003.34.15.0-1005.54.15.0-1006.64.15.0-1007.74.15.0-1009.94.15.0-1010.104.15.0-1011.114.15.0-1016.164.15.0-1017.17+59 more

Fixed in:

4.15.0-1111.118

linux-aws

Ubuntu Pro 14.04 LTS

Affected versions:

4.4.0-1002.24.4.0-1003.34.4.0-1005.54.4.0-1006.64.4.0-1009.94.4.0-1010.104.4.0-1011.114.4.0-1012.124.4.0-1014.144.4.0-1016.16+56 more

Fixed in:

4.4.0-1103.108

References

REPORThttps://arxiv.org/pdf/2112.09604.pdf REPORThttps://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.12.4 REPORThttps://git.kernel.org/linus/aa6dd211e4b1dde9d5dc25d699d35f789ae7eeba REPORThttps://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/net/ipv4/route.c?id=aa6dd211e4b1dde9d5dc25d699d35f789ae7eeba REPORThttps://ubuntu.com/security/CVE-2021-45486 ADVISORYhttps://ubuntu.com/security/notices/USN-5361-1 REPORThttps://www.cve.org/CVERecord?id=CVE-2021-45486

CVSS Analysis

CVSS v3.1

Exploitability

Attack Vector

AdjacentAV:A

Attack Complexity

LowAC:L

Privileges Required

LowPR:L

User Interaction

NoneUI:N

Scope

UnchangedS:U

Impact

Confidentiality

LowC:L

Integrity

NoneI:N

Availability

NoneA:N

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

Upstream

CVE-2021-45486

USN-5361-1

Ecosystems(30)

Ubuntu 18.04 LTS Ubuntu 20.04 LTS Ubuntu 25.04 Ubuntu Pro 14.04 LTS Ubuntu Pro 16.04 LTS

Timeline

PublishedDec 25, 2021

ModifiedJul 15, 2025

UBUNTU-CVE-2021-45486 | Mondoo Vulnerability Intelligence

UBUNTU-CVE-2021-45486

Details

Affected Packages(206 packages)

References

CVSS Analysis

Upstream

Related

Ecosystems(30)

Timeline