CVE-2026-43238

In the Linux kernel, the following vulnerability has been resolved:<br /> <br /> net/sched: act_skbedit: fix divide-by-zero in tcf_skbedit_hash()<br /> <br /> Commit 38a6f0865796 ("net: sched: support hash selecting tx queue")<br /> added SKBEDIT_F_TXQ_SKBHASH support. The inclusive range size is<br /> computed as:<br /> <br /> mapping_mod = queue_mapping_max - queue_mapping + 1;<br /> <br /> The range size can be 65536 when the requested range covers all possible<br /> u16 queue IDs (e.g. queue_mapping=0 and queue_mapping_max=U16_MAX).<br /> That value cannot be represented in a u16 and previously wrapped to 0,<br /> so tcf_skbedit_hash() could trigger a divide-by-zero:<br /> <br /> queue_mapping += skb_get_hash(skb) % params-&gt;mapping_mod;<br /> <br /> Compute mapping_mod in a wider type and reject ranges larger than U16_MAX<br /> to prevent params-&gt;mapping_mod from becoming 0 and avoid the crash.