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CVE-2022-49649

5.5 · MEDIUM

In the Linux kernel, the following vulnerability has been resolved: xen/netback: avoid entering xenvif_rx_next_skb() with an empty rx queue xenvif_rx_next_skb() is expecting the rx queue not bein…

Published Feb 26, 2025CWE-476EPSS 0.27%

Overview

CVE-2022-49649 is a medium-severity vulnerability. It was published on February 26, 2025 and has a CVSS 3.1 base score of 5.5 (MEDIUM).

This vulnerability has a CVSS 3.1 base score of 5.5, rated MEDIUM. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

Technical description

In the Linux kernel, the following vulnerability has been resolved:

xen/netback: avoid entering xenvif_rx_next_skb() with an empty rx queue

xenvif_rx_next_skb() is expecting the rx queue not being empty, but

in case the loop in xenvif_rx_action() is doing multiple iterations,

the availability of another skb in the rx queue is not being checked.

This can lead to crashes:

[40072.537261] BUG: unable to handle kernel NULL pointer dereference at 0000000000000080

[40072.537407] IP: xenvif_rx_skb+0x23/0x590 [xen_netback]

[40072.537534] PGD 0 P4D 0

[40072.537644] Oops: 0000 [#1] SMP NOPTI

[40072.537749] CPU: 0 PID: 12505 Comm: v1-c40247-q2-gu Not tainted 4.12.14-122.121-default #1 SLE12-SP5

[40072.537867] Hardware name: HP ProLiant DL580 Gen9/ProLiant DL580 Gen9, BIOS U17 11/23/2021

[40072.537999] task: ffff880433b38100 task.stack: ffffc90043d40000

[40072.538112] RIP: e030:xenvif_rx_skb+0x23/0x590 [xen_netback]

[40072.538217] RSP: e02b:ffffc90043d43de0 EFLAGS: 00010246

[40072.538319] RAX:

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Refgit.kernel.org/stable/c/5a071aefd6414af5a20321ab58a0557b81993687Refgit.kernel.org/stable/c/7425479d20f9e96f7c3ec8e8a93fe0d7478724cbRefgit.kernel.org/stable/c/94e8100678889ab428e68acadf042de723f094b9Refgit.kernel.org/stable/c/b99174ac57fe5d8867448c03b23828e63f24cb1cRefgit.kernel.org/stable/c/b9c32a6886af79d6e0ad87a7b01800ed079cdd02Refgit.kernel.org/stable/c/c0fcceb5f3f1ec197c014fe218c2f28108cacd27Refgit.kernel.org/stable/c/d5320c6a27aa975aff740f9cb481dcbde48f4348Refgit.kernel.org/stable/c/f0b5c819b062df8bf5f2acf4697e3871cb3722da

How CyberStrike helps

Frequently asked questions

What is CVE-2022-49649?

CVE-2022-49649 is a medium-severity vulnerability. It was published on February 26, 2025 and has a CVSS 3.1 base score of 5.5 (MEDIUM).

How severe is CVE-2022-49649?

This vulnerability has a CVSS 3.1 base score of 5.5, rated MEDIUM. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2022-49649?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2022-49649?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2022-49649 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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