CVE-2026-64113

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

ixgbevf: fix use-after-free in VEPA multicast source pruning

ixgbevf_clean_rx_irq() prunes frames whose source MAC matches the VF's

own address (VEPA multicast workaround) by freeing the skb and

continuing to the next descriptor:

dev_kfree_skb_irq(skb);

continue;

The skb pointer is declared outside the while loop and persists across

iterations. Because the continue skips the "skb = NULL" reset at the

bottom of the loop, the next iteration enters the "else if (skb)" path

and calls ixgbevf_add_rx_frag() on the freed skb, dereferencing

skb_shinfo(skb)->nr_frags - a use-after-free in NAPI softirq context.

The sibling driver iavf already handles this correctly by nulling the

pointer before continuing. Apply the same pattern here.

I do not have ixgbevf hardware; the bug was found by static analysis

(scan_drop_continue_loops.py + semgrep drop_continue_in_loop, multi-tool

corroboration with the highest score in the scan). The UAF was confirmed

under KASAN by loading a test module that reproduces the exact code

pattern (alloc skb, kfree_skb, then read skb_shinfo(skb)->nr_frags):

BUG: KASAN: slab-use-after-free in ixgbevf_uaf_test_init+0x100/0x1000

Read of size 8 at addr 000000006163ae78 by task insmod/30

freed 208-byte region [000000006163adc0, 000000006163ae90)

QEMU emulates igb (82576) but not ixgbe (82599), and the igbvf VF

driver does not include the VEPA source pruning path, so a full

end-to-end reproduction with emulated hardware was not possible.