CVE-2026-72393

Summary

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

eth: fbnic: don't cache shinfo across skb realloc

fbnic_tx_lso() calls skb_cow_head() which may reallocate the skb including the shared info. We can't use the pointer calculated before the call.

BUG: KASAN: slab-use-after-free in fbnic_tx_lso.isra.0+0x668/0x8e0
Read of size 4 at addr ff110000262edd98 by task swapper/5/0
Call Trace:
 fbnic_tx_lso.isra.0+0x668/0x8e0
 fbnic_xmit_frame+0x622/0xba0
 dev_hard_start_xmit+0xf4/0x620

Allocated by task 8653:
 __alloc_skb+0x11e/0x5f0
 alloc_skb_with_frags+0xcc/0x6c0
 sock_alloc_send_pskb+0x327/0x3f0
 __ip_append_data+0x188b/0x47a0
 ip_make_skb+0x24a/0x300
 udp_sendmsg+0x14d2/0x21e0

Freed by task 0:
 kfree+0x123/0x5a0
 pskb_expand_head+0x36c/0xfa0
 fbnic_tx_lso.isra.0+0x500/0x8e0
 fbnic_xmit_frame+0x622/0xba0
 dev_hard_start_xmit+0xf4/0x620
 sch_direct_xmit+0x25b/0x1100

The buggy address belongs to the object at ff110000262edc40
 which belongs to the cache skbuff_small_head of size 640
The buggy address is located 344 bytes inside of
 freed 640-byte region [ff110000262edc40, ff110000262ede

Affected Software

Weaknesses

References

• https://git.kernel.org/stable/c/83df3e2594cd78aa40b1246a19879abb4891945b
• https://git.kernel.org/stable/c/21f304c2aae46625e050c28d979f4b9d83faa85e
• https://git.kernel.org/stable/c/62b68b774f06bf52e329f254f0199bc43d350ccf

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