DEBIAN-CVE-2026-64113

In the Linux kernel, the following vulnerability has been resolved:  ixgbevf: fix use-after-free in VEPA multicast source pruning  ixgbevfcleanrxirq() prunes frames whose source MAC matches the VF's own address (VEPA multicast workaround) by freeing the skb and continuing to the next descriptor:      devkfreeskbirq(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 ixgbevfaddrxfrag() on the freed skb, dereferencing skbshinfo(skb)->nrfrags - 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 (scandropcontinueloops.py + semgrep dropcontinueinloop, 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, kfreeskb, then read skbshinfo(skb)->nrfrags):    BUG: KASAN: slab-use-after-free in ixgbevfuaftest_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.