Buffer Access with Incorrect Length Value Affecting kernel6.18-headers package, versions <1:6.18.44-99.149.amzn2023


Severity

Recommended
0.0
high
0
10

Based on Amazon Linux security rating.

Threat Intelligence

EPSS
0.49% (41st percentile)

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  • Snyk IDSNYK-AMZN2023-KERNEL618HEADERS-19814123
  • published15 Sept 2026
  • disclosed15 Aug 2026

Introduced: 15 Aug 2026

CVE-2026-74474  (opens in a new tab)
CWE-805  (opens in a new tab)

How to fix?

Upgrade Amazon-Linux:2023 kernel6.18-headers to version 1:6.18.44-99.149.amzn2023 or higher.
This issue was patched in ALAS2023-2026-2106.

NVD Description

Note: Versions mentioned in the description apply only to the upstream kernel6.18-headers package and not the kernel6.18-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:

vxlan: use pskb_network_may_pull() for transmit path header pulls

In vxlan_xmit(), arp_reduce(), and vxlan_mdb_entry_skb_get(), pskb_may_pull() was being called to verify the availability of network layer headers (ARP, IPv6/ND, IP/IPv6 MDB keys).

However, during transmit skb->data points to the MAC header, so skb_network_offset(skb) is ETH_HLEN (14 bytes). Using pskb_may_pull(skb, len) only checks len bytes from skb->data rather than skb_network_offset(skb) + len, which can leave part of the network header in non-linear frags.

Replace these remaining pskb_may_pull() calls with pskb_network_may_pull() to properly account for the MAC header offset.

CVSS Base Scores

version 3.1