CVE-2026-31684
N/A
Summary
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.
Affected Software
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| Linux | Linux | 2ecba2d1e45b24620a7c3df9531895cf68d5dec6 < 0410c619e86551677fb79887a38eccad3f5a0725 | affected |
| Linux | Linux | 2ecba2d1e45b24620a7c3df9531895cf68d5dec6 < 886469b6455611a511aa6013e957e15e50577513 | affected |
| Linux | Linux | 2ecba2d1e45b24620a7c3df9531895cf68d5dec6 < 46c07ad50fa2f4ba7663ee1b72b75ad7ad45cf09 | affected |
| Linux | Linux | 2ecba2d1e45b24620a7c3df9531895cf68d5dec6 < eb3765b90eb8f2a3d6310a80c14a9e57ec4267a2 | affected |
| Linux | Linux | 2ecba2d1e45b24620a7c3df9531895cf68d5dec6 < a69738efea0996d05a3c7d2178551b891744df1b | affected |
| Linux | Linux | 2ecba2d1e45b24620a7c3df9531895cf68d5dec6 < ec4930979b3f7bbeb7af5744599fc6603a4dba62 | affected |
| Linux | Linux | 2ecba2d1e45b24620a7c3df9531895cf68d5dec6 < 3d165d975305cf76ff0b10a3c798fb31e5f5f9a5 | affected |
| Linux | Linux | 2ecba2d1e45b24620a7c3df9531895cf68d5dec6 < c842743d073bdd683606cb414eb0ca84465dd834 | affected |
| Linux | Linux | 3764bfae5056e95617b6ee074129297e11710886 | affected |
| Linux | Linux | 4.19.99 < 4.20 | affected |
| Linux | Linux | 5.1 | affected |
| Linux | Linux | 0 < 5.1 | unaffected |
| Linux | Linux | 5.10.258 <= 5.10.* | unaffected |
| Linux | Linux | 5.15.209 <= 5.15.* | unaffected |
| Linux | Linux | 6.1.175 <= 6.1.* | unaffected |
| Linux | Linux | 6.6.136 <= 6.6.* | unaffected |
| Linux | Linux | 6.12.83 <= 6.12.* | unaffected |
| Linux | Linux | 6.18.24 <= 6.18.* | unaffected |
| Linux | Linux | 6.19.14 <= 6.19.* | unaffected |
| Linux | Linux | 7.0 <= * | unaffected |
Weaknesses
References
- https://git.kernel.org/stable/c/0410c619e86551677fb79887a38eccad3f5a0725
- https://git.kernel.org/stable/c/886469b6455611a511aa6013e957e15e50577513
- https://git.kernel.org/stable/c/46c07ad50fa2f4ba7663ee1b72b75ad7ad45cf09
- https://git.kernel.org/stable/c/eb3765b90eb8f2a3d6310a80c14a9e57ec4267a2
- https://git.kernel.org/stable/c/a69738efea0996d05a3c7d2178551b891744df1b
- https://git.kernel.org/stable/c/ec4930979b3f7bbeb7af5744599fc6603a4dba62
- https://git.kernel.org/stable/c/3d165d975305cf76ff0b10a3c798fb31e5f5f9a5
- https://git.kernel.org/stable/c/c842743d073bdd683606cb414eb0ca84465dd834
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