Description (CNA)
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 (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected 2ecba2d1e45b24620a7c3df9531895cf68d5dec6 before 0410c619e86551677fb79887a38eccad3f5a0725; affected 2ecba2d1e45b24620a7c3df9531895cf68d5dec6 before 886469b6455611a511aa6013e957e15e50577513; affected 2ecba2d1e45b24620a7c3df9531895cf68d5dec6 before 46c07ad50fa2f4ba7663ee1b72b75ad7ad45cf09; affected 2ecba2d1e45b24620a7c3df9531895cf68d5dec6 before eb3765b90eb8f2a3d6310a80c14a9e57ec4267a2; affected 2ecba2d1e45b24620a7c3df9531895cf68d5dec6 before a69738efea0996d05a3c7d2178551b891744df1b; affected 2ecba2d1e45b24620a7c3df9531895cf68d5dec6 before ec4930979b3f7bbeb7af5744599fc6603a4dba62; affected 2ecba2d1e45b24620a7c3df9531895cf68d5dec6 before 3d165d975305cf76ff0b10a3c798fb31e5f5f9a5; affected 2ecba2d1e45b24620a7c3df9531895cf68d5dec6 before c842743d073bdd683606cb414eb0ca84465dd834; affected 3764bfae5056e95617b6ee074129297e11710886; affected 4.19.99 before 4.20 |
| Linux / Linux | affected 5.1; unaffected 0 before 5.1; unaffected 5.10.258 through 5.10.*; unaffected 5.15.209 through 5.15.*; unaffected 6.1.175 through 6.1.*; unaffected 6.6.136 through 6.6.*; unaffected 6.12.83 through 6.12.*; unaffected 6.18.24 through 6.18.*; unaffected 6.19.14 through 6.19.*; unaffected 7.0 through * |
CWE
No CWE identifiers supplied.
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