CVE-2022-49561

What it is

In the Linux kernel, the following vulnerability has been resolved: netfilter: conntrack: re-fetch conntrack after insertion In case the conntrack is clashing, insertion can free skb->_nfct and set skb->_nfct to the already-confirmed entry. This wasn't found before because the conntrack entry and the extension space used to free'd after an rcu grace period, plus the race needs events enabled to trigger.

At a glance

Exploitability

Can be exploited over the network without logging in. High risk of data exposure, data tampering, service disruption.

Exploit odds

0.8% chance of exploitation in the next 30 days (EPSS).

Fix

A patch, advisory or fixed version is referenced. Upgrade or apply it.

Timeline

1. 2025-02-26 07:01 UTC PublishedDisclosed publicly on CVE.org and NVD
2. 2026-08-04 10:17 UTC Last updatedMost recent change to the record

Details

Published

2025-02-26 07:01 UTC

Last modified

2026-08-04 10:17 UTC

Exploit probability

0.8% · EPSS, next 30 days

Record status

Modified

Affected

• Linux Kernel < 4.14.282
• Linux Kernel < 4.19.246
• Linux Kernel < 5.4.197
• Linux Kernel < 5.10.120
• Linux Kernel < 5.15.45
• Linux Kernel < 5.17.13
• Linux Kernel < 5.18.2

Attack profile CVSS 3.1 · 9.8

Attack vector

Network

Complexity

Low

Privileges needed

None

User interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High