CVE-2026-72393

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

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

fbnictxlso() calls skbcowhead() 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 fbnictxlso.isra.0+0x668/0x8e0

    Read of size 4 at addr ff110000262edd98 by task swapper/5/0

    Call Trace:

     fbnictxlso.isra.0+0x668/0x8e0

     fbnicxmitframe+0x622/0xba0

     devhardstart_xmit+0xf4/0x620

    Allocated by task 8653:

     _allocskb+0x11e/0x5f0

     allocskbwith_frags+0xcc/0x6c0

     sockallocsend_pskb+0x327/0x3f0

     _ipappend_data+0x188b/0x47a0

     ipmakeskb+0x24a/0x300

     udp_sendmsg+0x14d2/0x21e0

    Freed by task 0:

     kfree+0x123/0x5a0

     pskbexpandhead+0x36c/0xfa0

     fbnictxlso.isra.0+0x500/0x8e0

     fbnicxmitframe+0x622/0xba0

     devhardstart_xmit+0xf4/0x620

     schdirectxmit+0x25b/0x1100

    The buggy address belongs to the object at ff110000262edc40

     which belongs to the cache skbuffsmallhead of size 640

    The buggy address is located 344 bytes inside of

     freed 640-byte region [ff110000262edc40, ff110000262ede