CVE-2026-31515

Summary

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

af_key: validate families in pfkey_send_migrate()

syzbot was able to trigger a crash in skb_put() [1]

Issue is that pfkey_send_migrate() does not check old/new families, and that set_ipsecrequest() @family argument was truncated, thus possibly overfilling the skb.

Validate families early, do not wait set_ipsecrequest().

[1]

skbuff: skb_over_panic: text:ffffffff8a752120 len:392 put:16 head:ffff88802a4ad040 data:ffff88802a4ad040 tail:0x188 end:0x180 dev:<NULL> kernel BUG at net/core/skbuff.c:214 ! Call Trace: <TASK> skb_over_panic net/core/skbuff.c:219 [inline] skb_put+0x159/0x210 net/core/skbuff.c:2655 skb_put_zero include/linux/skbuff.h:2788 [inline] set_ipsecrequest net/key/af_key.c:3532 [inline] pfkey_send_migrate+0x1270/0x2e50 net/key/af_key.c:3636 km_migrate+0x155/0x260 net/xfrm/xfrm_state.c:2848 xfrm_migrate+0x2140/0x2450 net/xfrm/xfrm_policy.c:4705 xfrm_do_migrate+0x8ff/0xaa0 net/xfrm/xfrm_user.c:3150

Affected Software

Weaknesses

References

• https://git.kernel.org/stable/c/d0c5aa8dd38887714f1aad04236a3620b56a5e4e
• https://git.kernel.org/stable/c/e06b596fc4eb01936a2e5dccad17c946d660bab8
• https://git.kernel.org/stable/c/8ddf8de7e758f6888988467af9ffc8adf589fb16
• https://git.kernel.org/stable/c/d3225e6b9bd51ec177970a628fe4b11237ce87d5
• https://git.kernel.org/stable/c/7b18692c59afb8e5c364c8e3ac01e51dd6b52028
• https://git.kernel.org/stable/c/83f644ea92987c100b82d8481ae2230faeed3d34
• https://git.kernel.org/stable/c/ee836e820a40e2ca4da8af7310bff92d586772d4
• https://git.kernel.org/stable/c/eb2d16a7d599dc9d4df391b5e660df9949963786

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