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CVE-2024-49948

5.5 · MEDIUM

In the Linux kernel, the following vulnerability has been resolved: net: add more sanity checks to qdisc_pkt_len_init() One path takes care of SKB_GSO_DODGY, assuming skb->len is bigger than hdr_…

Published Oct 21, 2024EPSS 0.29%

Overview

CVE-2024-49948 is a medium-severity vulnerability. It was published on October 21, 2024 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:

net: add more sanity checks to qdisc_pkt_len_init()

One path takes care of SKB_GSO_DODGY, assuming

skb->len is bigger than hdr_len.

virtio_net_hdr_to_skb() does not fully dissect TCP headers,

it only make sure it is at least 20 bytes.

It is possible for an user to provide a malicious 'GSO' packet,

total length of 80 bytes.

- 20 bytes of IPv4 header

- 60 bytes TCP header

- a small gso_size like 8

virtio_net_hdr_to_skb() would declare this packet as a normal

GSO packet, because it would see 40 bytes of payload,

bigger than gso_size.

We need to make detect this case to not underflow

qdisc_skb_cb(skb)->pkt_len.

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/1eebe602a8d8264a12e35e39d0645fa88dbbacddRefgit.kernel.org/stable/c/2415f465730e48b6e38da1c7c097317bf5dd2d20Refgit.kernel.org/stable/c/27a8fabc54d2f960d47bdfbebf2bdc6e8a92a4c4Refgit.kernel.org/stable/c/473426a1d53a68dd1e718e6cd00d57936993fa6cRefgit.kernel.org/stable/c/566a931a1436d0e0ad13708ea55479b95426213cRefgit.kernel.org/stable/c/9b0ee571d20a238a22722126abdfde61f1b2bdd0Refgit.kernel.org/stable/c/ab9a9a9e9647392a19e7a885b08000e89c86b535Refgit.kernel.org/stable/c/d7d1a28f5dd57b4d83def876f8d7b4403bd37df9Refgit.kernel.org/stable/c/ff1c3cadcf405ab37dd91418a62a7acecf3bc5e2Reflists.debian.org/debian-lts-announce/2025/01/msg00001.html

How CyberStrike helps

Frequently asked questions

What is CVE-2024-49948?

CVE-2024-49948 is a medium-severity vulnerability. It was published on October 21, 2024 and has a CVSS 3.1 base score of 5.5 (MEDIUM).

How severe is CVE-2024-49948?

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-2024-49948?

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-2024-49948?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2024-49948 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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