CVE-2026-43090

In the Linux kernel, the following vulnerability has been resolved:

xfrm: fix refcount leak in xfrmmigratepolicy_find

syzkaller reported a memory leak in xfrmpolicyalloc:

BUG: memory leak unreferenced object 0xffff888114d79000 (size 1024): comm "syz.1.17", pid 931 ... xfrmpolicyalloc+0xb3/0x4b0 net/xfrm/xfrm_policy.c:432

The root cause is a double call to xfrmpolholdrcu() in xfrmmigratepolicyfind(). The lookup function already returns a policy with held reference, making the second call redundant.

Remove the redundant xfrmpolhold_rcu() call to fix the refcount imbalance and prevent the memory leak.

Found by Linux Verification Center (linuxtesting.org) with Syzkaller.