CVE-2026-98241
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().
How to fix
- Linux Linuxb1a88633c36d2cbc3831382f3846754d344276fd, 904a0e827d0d7189271a3a2eb648293809f25efc, 675919e08ce266b8cac11fd9af29170e762a480f, 60459c670329d586a58db5d8f811fa5accfe4862, ca3d68c3213475b53db6647e159dc73bd1af5ab1, 4c030a0400ebfd2318361c923a88103b2c67c49f, c21f3f7fbfeda7c5794f606cb0ffcc2d9001eef8, 6973a21ee73c5567f883813c8ef414774b45892f or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| Linux Linux | dd767856a36e00b631d65ebc4bb81b19915532d6 ≤ v < b1a88633c36d2cbc3831382f3846754d344276fd, dd767856a36e00b631d65ebc4bb81b19915532d6 ≤ v < 904a0e827d0d7189271a3a2eb648293809f25efc, dd767856a36e00b631d65ebc4bb81b19915532d6 ≤ v < 675919e08ce266b8cac11fd9af29170e762a480f, dd767856a36e00b631d65ebc4bb81b19915532d6 ≤ v < 60459c670329d586a58db5d8f811fa5accfe4862, dd767856a36e00b631d65ebc4bb81b19915532d6 ≤ v < ca3d68c3213475b53db6647e159dc73bd1af5ab1, dd767856a36e00b631d65ebc4bb81b19915532d6 ≤ v < 4c030a0400ebfd2318361c923a88103b2c67c49f, dd767856a36e00b631d65ebc4bb81b19915532d6 ≤ v < c21f3f7fbfeda7c5794f606cb0ffcc2d9001eef8, dd767856a36e00b631d65ebc4bb81b19915532d6 ≤ v < 6973a21ee73c5567f883813c8ef414774b45892f, 3.2 | b1a88633c36d2cbc3831382f3846754d344276fd, 904a0e827d0d7189271a3a2eb648293809f25efc, 675919e08ce266b8cac11fd9af29170e762a480f, 60459c670329d586a58db5d8f811fa5accfe4862, ca3d68c3213475b53db6647e159dc73bd1af5ab1, 4c030a0400ebfd2318361c923a88103b2c67c49f, c21f3f7fbfeda7c5794f606cb0ffcc2d9001eef8, 6973a21ee73c5567f883813c8ef414774b45892f |
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