CVE-2026-74269

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

bnxt: fix head underflow on XDP head-grow

The xdp.py test test_xdp_native_adjst_head_grow_data crashes when run on

a bnxt machine (and also crashes in NIPA).

It seems that the bug is an underflow in bnxt_rx_multi_page_skb, which

builds the skb head:

napi_build_skb(data_ptr - bp->rx_offset, rxr->rx_page_size);

The problem with this expression is that in page mode, rx_offset is:

bp->rx_offset = NET_IP_ALIGN + XDP_PACKET_HEADROOM;

Which evaluates (at least on x86_64) to 258.

The test test_xdp_native_adjst_head_grow_data tests a case where the

head is adjusted by -256.

When this test runs, data_ptr is shifted to frag_start + 2 (where

frag_start = page_address(page) + offset).

Then, bnxt_rx_multi_page_skb is invoked and the napi_build_skb

expression subtracts 258, landing at an address before frag_start. This

could be either the previous fragment or the previous physical page when

the offset is < 256 (e.g. if the fragment started at offset 0).

When the skb is freed, the page pool fragment reference is dropped on

either the wrong page or the wrong frag of the right page. In either

case, the corrupted reference count can lead to the page being

prematurely recycled while still in use. Once (incorrectly) recycled, it

can be handed out again and on driver teardown this would result in a

double free.

The commit under fixes updated this code to handle the case where the

native page size is >= 64k, but it unintentionally broke the head grow

case.

To fix this, add an offset field to struct bnxt_sw_rx_bd, mirroring the

existing offset field in struct bnxt_sw_rx_agg_bd. Populate it on

allocation and preserve it on reuse.

In bnxt_rx_multi_page_skb, use the newly added offset field to compute

the fragment start and pass that to napi_build_skb. Adjust the layout

with skb_reserve.

There are two cases, the non-adjustment case and the adjustment case.

In both cases, the skb is built at page_address(page) + offset to

account for the case where the native page size >= 64K and skb_reserve

is called with data_ptr - (page_address(page) + offset). That

difference equals bp->rx_offset when data_ptr was not moved, or

bp->rx_offset + xdp_adjust when XDP adjusted the head.

Re-running the failing test with this commit applied causes the test to

run successfully to completion.

The other rx_skb_func implementations don't have this issue.