Improper Input Validation Affecting kernel-headers package, versions <0:6.1.115-126.197.amzn2023


Severity

Recommended
high

Based on Amazon Linux security rating.

Threat Intelligence

EPSS
0.04% (6th percentile)

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  • Snyk IDSNYK-AMZN2023-KERNELHEADERS-9520501
  • published27 Mar 2025
  • disclosed21 Oct 2024

Introduced: 21 Oct 2024

CVE-2024-49948  (opens in a new tab)
CWE-20  (opens in a new tab)

How to fix?

Upgrade Amazon-Linux:2023 kernel-headers to version 0:6.1.115-126.197.amzn2023 or higher.
This issue was patched in ALAS2023-2025-794.

NVD Description

Note: Versions mentioned in the description apply only to the upstream kernel-headers package and not the kernel-headers package as distributed by Amazon-Linux. See How to fix? for Amazon-Linux:2023 relevant fixed versions and status.

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.

CVSS Base Scores

version 3.1