CVE-2026-43090

Summary

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

xfrm: fix refcount leak in xfrm_migrate_policy_find

syzkaller reported a memory leak in xfrm_policy_alloc:

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

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

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

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

Affected Software

Weaknesses

References

• https://git.kernel.org/stable/c/21e235a36cfb6d145cefb10728f12f5dc5412f54
• https://git.kernel.org/stable/c/836ee1b0426ea3db31531e9581cc32f513d24e32
• https://git.kernel.org/stable/c/70c2a89a3bc207c3bfbf6f21bb439809e0a4a27a
• https://git.kernel.org/stable/c/83317cce60a032c49480dcdabe146435bd689d03

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