CVE-2026-74473

In the Linux kernel, the following vulnerability has been resolved: vxlan: use pskb_network_may_pull() in route_shortcircuit() route_shortcircuit() currently calls pskb_may_pull(skb, sizeof(struct iphdr)) (or ipv6hdr), which checks if bytes are available starting from skb->data. However, in vxlan_xmit(), skb->data points to the MAC header, so skb_network_offset(skb) is ETH_HLEN (14 bytes). Using pskb_may_pull(skb, 20) only checks 20 bytes from skb->data (which is 14 bytes MAC header + 6 bytes of IP header), leaving the rest of the IP header potentially un-pulled in non-linear frags. Subsequent dereferences of ip_hdr(skb)->daddr can read beyond the pulled linear buffer length. Fix this by using pskb_network_may_pull(), which adds skb_network_offset(skb) to the length check to ensure the full network header is present in the linear buffer.

CVSS v3 9.8 CRITICAL

9.8^/10

CVSS v3 : CRITICAL

Vector :

Exploitability : 3.9 / Impact : 5.9

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction NONE

Confidentiality Impact HIGH

Integrity Impact HIGH

Availability Impact HIGH

Scope UNCHANGED

References

Link	Resource
https://git.kernel.org/stable/c/214ba43faf106cb06cd3dd30999c5c809c868b53
https://git.kernel.org/stable/c/26bb2dd0a8839617e2c79ffbbe1923f8e4bab9fb
https://git.kernel.org/stable/c/42887be7c4cf283cce02cd0fb6411221167c8b6c
https://git.kernel.org/stable/c/4f3f96e771a20263635bb5e1307c112d613b4bbd
https://git.kernel.org/stable/c/6bd0a3a1b5744166946f0c551a6665c3b46b05e4
https://git.kernel.org/stable/c/aa0d31376d574ac858a40078431a77127bf04ee4
https://git.kernel.org/stable/c/c419af4924c1593500a40519730ed98575d04a3e
https://git.kernel.org/stable/c/ee799977d7941dbfb11049e17edd9eaf4f8820f7

Configurations

No configuration.

History

No history.

Information

Published : 2026-08-15 13:17

Updated : 2026-08-19 17:21

NVD link : CVE-2026-74473

Mitre link : CVE-2026-74473

CVE.ORG link : CVE-2026-74473

JSON object : View

Products Affected

No product.

CWE

No CWE.

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Using pskb_may_pull(skb, 20)\nonly checks 20 bytes from skb->data (which is 14 bytes MAC header + 6 bytes of\nIP header), leaving the rest of the IP header potentially un-pulled in non-linear\nfrags. Subsequent dereferences of ip_hdr(skb)->daddr can read beyond the pulled\nlinear buffer length.\n\nFix this by using pskb_network_may_pull(), which adds skb_network_offset(skb) to\nthe length check to ensure the full network header is present in the linear buffer."}], "lastModified": "2026-08-19T17:21:04.623", "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}