Description
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 products
Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.
Linux Linux
Default version status: unaffected
dd767856a36e00b631d65ebc4bb81b19915532d6 to < b1a88633c36d2cbc3831382f3846754d344276fdaffecteddd767856a36e00b631d65ebc4bb81b19915532d6 to < 904a0e827d0d7189271a3a2eb648293809f25efcaffecteddd767856a36e00b631d65ebc4bb81b19915532d6 to < 675919e08ce266b8cac11fd9af29170e762a480faffecteddd767856a36e00b631d65ebc4bb81b19915532d6 to < 60459c670329d586a58db5d8f811fa5accfe4862affecteddd767856a36e00b631d65ebc4bb81b19915532d6 to < ca3d68c3213475b53db6647e159dc73bd1af5ab1affecteddd767856a36e00b631d65ebc4bb81b19915532d6 to < 4c030a0400ebfd2318361c923a88103b2c67c49faffecteddd767856a36e00b631d65ebc4bb81b19915532d6 to < c21f3f7fbfeda7c5794f606cb0ffcc2d9001eef8affecteddd767856a36e00b631d65ebc4bb81b19915532d6 to < 6973a21ee73c5567f883813c8ef414774b45892faffected
Linux Linux
Default version status: affected
3.2affected0 to < 3.2unaffected5.10.271 to ≤ 5.10.*unaffected5.15.222 to ≤ 5.15.*unaffected6.1.189 to ≤ 6.1.*unaffected6.6.158 to ≤ 6.6.*unaffected6.12.112 to ≤ 6.12.*unaffected6.18.54 to ≤ 6.18.*unaffected7.2.8 to ≤ 7.2.*unaffected7.3 to ≤ *unaffected
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 ↗