Description (CNA)
In the Linux kernel, the following vulnerability has been resolved: ipv6: xfrm: use full sockets in local error paths xfrm6_local_rxpmtu() and xfrm6_local_error() dereference skb->sk as if it always pointed at a full IPv6 socket. That is not guaranteed. TCP SYN-ACK skbs can be owned by a TCP_NEW_SYN_RECV request_sock while the output path itself is driven by the full listener. If rerouting selects an IPv6 XFRM tunnel route with a lower MTU, the local PMTU/error handling path can reach these callbacks with that mini-socket still attached to the skb. The callbacks then miscast the request socket as a full inet/IPv6 socket and can read beyond the request_sock allocation when they access inet_sock or ipv6_pinfo state. Resolve the owner with skb_to_full_sk() in both callbacks and bail out when no full socket is attached. This matches the surrounding XFRM IPv6 PMTU/error logic, which already reasons about full sockets with skb_to_full_sk().
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected dd767856a36e00b631d65ebc4bb81b19915532d6 before b1a88633c36d2cbc3831382f3846754d344276fd; affected dd767856a36e00b631d65ebc4bb81b19915532d6 before 904a0e827d0d7189271a3a2eb648293809f25efc; affected dd767856a36e00b631d65ebc4bb81b19915532d6 before 675919e08ce266b8cac11fd9af29170e762a480f; affected dd767856a36e00b631d65ebc4bb81b19915532d6 before 60459c670329d586a58db5d8f811fa5accfe4862; affected dd767856a36e00b631d65ebc4bb81b19915532d6 before ca3d68c3213475b53db6647e159dc73bd1af5ab1; affected dd767856a36e00b631d65ebc4bb81b19915532d6 before 4c030a0400ebfd2318361c923a88103b2c67c49f; affected dd767856a36e00b631d65ebc4bb81b19915532d6 before c21f3f7fbfeda7c5794f606cb0ffcc2d9001eef8; affected dd767856a36e00b631d65ebc4bb81b19915532d6 before 6973a21ee73c5567f883813c8ef414774b45892f |
| Linux / Linux | affected 3.2; unaffected 0 before 3.2; unaffected 5.10.271 through 5.10.*; unaffected 5.15.222 through 5.15.*; unaffected 6.1.189 through 6.1.*; unaffected 6.6.158 through 6.6.*; unaffected 6.12.112 through 6.12.*; unaffected 6.18.54 through 6.18.*; unaffected 7.2.8 through 7.2.*; unaffected 7.3 through * |
CWE
No CWE identifiers supplied.
References
- https://git.kernel.org/stable/c/b1a88633c36d2cbc3831382f3846754d344276fd
- https://git.kernel.org/stable/c/904a0e827d0d7189271a3a2eb648293809f25efc
- https://git.kernel.org/stable/c/675919e08ce266b8cac11fd9af29170e762a480f
- https://git.kernel.org/stable/c/60459c670329d586a58db5d8f811fa5accfe4862
- https://git.kernel.org/stable/c/ca3d68c3213475b53db6647e159dc73bd1af5ab1
- https://git.kernel.org/stable/c/4c030a0400ebfd2318361c923a88103b2c67c49f
- https://git.kernel.org/stable/c/c21f3f7fbfeda7c5794f606cb0ffcc2d9001eef8
- https://git.kernel.org/stable/c/6973a21ee73c5567f883813c8ef414774b45892f