Linux vulnerability

What happened

In the Linux kernel, the following vulnerability has been resolved: ipv6: xfrm6: release dst on error in xfrm6_rcv_encap() xfrm6_rcv_encap() performs an IPv6 route lookup when the skb does not already have a dst attached. ip6_route_input_lookup() returns a referenced dst entry even when the lookup resolves to an error route. If dst->error is set, xfrm6_rcv_encap() drops the skb without attaching the dst to the skb and without releasing the reference returned by the lookup. Repeated packets hitting this path therefore leak dst entries. Release the dst before jumping to the drop path.

Affected versions

Linux: 0146dca70b877b73c5fd9c67912b8a0ca8a7bac7 through before a0721bcd72641c32b281f227a94505b31cf54117 (git); 0146dca70b877b73c5fd9c67912b8a0ca8a7bac7 through before a20b34f6e854fe6f2aa82528fae7a88759919eb4 (git); 0146dca70b877b73c5fd9c67912b8a0ca8a7bac7 through before 870560015ce6e0d8f841c6a8aba33c44be52c727 (git); 0146dca70b877b73c5fd9c67912b8a0ca8a7bac7 through before c2efc4956981066df2fef1cc77391b523db6d8e4 (git); 0146dca70b877b73c5fd9c67912b8a0ca8a7bac7 through before 554c9b090c8ac5b1c5c507f4badf8d5d0c9c6e13 (git); 0146dca70b877b73c5fd9c67912b8a0ca8a7bac7 through before 9d5047782f9bd2829e529df69209bf3232eb561f (git); 0146dca70b877b73c5fd9c67912b8a0ca8a7bac7 through before 6a5eec0a2a0e99ec9743cf8f1c4082178811d90a (git); 0146dca70b877b73c5fd9c67912b8a0ca8a7bac7 through before bc0fcb9823cd0894934cf968b525c575833d7078 (git); 5.8; V3.1.6 through before * (custom) Fixed: See vendor advisory.

Why it matters

Review the vendor advisory and exposure of the affected product to determine operational impact.

Detection & mitigation

• Apply vendor-provided updates or mitigations.
• Review affected product exposure and access logs.