CVE-2026-31684

MediumCVSS 5.5/10Last modified Nov 11, 2026

Description

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

net: sched: act_csum: validate nested VLAN headers

tcf_csum_act() walks nested VLAN headers directly from skb->data when an skb still carries in-payload VLAN tags. The current code reads vlan->h_vlan_encapsulated_proto and then pulls VLAN_HLEN bytes without first ensuring that the full VLAN header is present in the linear area.

If only part of an inner VLAN header is linearized, accessing h_vlan_encapsulated_proto reads past the linear area, and the following skb_pull(VLAN_HLEN) may violate skb invariants.

Fix this by requiring pskb_may_pull(skb, VLAN_HLEN) before accessing and pulling each nested VLAN header. If the header still is not fully available, drop the packet through the existing error path.

Metrics

CVSS 3.1 5.5/10CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Affected software

VendorProductVersions
LinuxLinux>= 2ecba2d1e45b24620a7c3df9531895cf68d5dec6, < 0410c619e86551677fb79887a38eccad3f5a0725; >= 2ecba2d1e45b24620a7c3df9531895cf68d5dec6, < 886469b6455611a511aa6013e957e15e50577513; >= 2ecba2d1e45b24620a7c3df9531895cf68d5dec6, < 46c07ad50fa2f4ba7663ee1b72b75ad7ad45cf09; >= 2ecba2d1e45b24620a7c3df9531895cf68d5dec6, < eb3765b90eb8f2a3d6310a80c14a9e57ec4267a2; >= 2ecba2d1e45b24620a7c3df9531895cf68d5dec6, < a69738efea0996d05a3c7d2178551b891744df1b; >= 2ecba2d1e45b24620a7c3df9531895cf68d5dec6, < ec4930979b3f7bbeb7af5744599fc6603a4dba62; >= 2ecba2d1e45b24620a7c3df9531895cf68d5dec6, < 3d165d975305cf76ff0b10a3c798fb31e5f5f9a5; >= 2ecba2d1e45b24620a7c3df9531895cf68d5dec6, < c842743d073bdd683606cb414eb0ca84465dd834; 3764bfae5056e95617b6ee074129297e11710886; >= 4.19.99, < 4.20
LinuxLinux5.1

References

Timeline

Published
Apr 25, 2026
Last modified
Nov 11, 2026
NVD status
Modified

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CVE-2026-31684: Medium severity, CVSS 5.5 | Vulnix