CVE-2026-72248
Description
In the Linux kernel, the following vulnerability has been resolved: netfilter: flowtable: support IPIP tunnel with direct xmit The combination of IPIP tunnel with direct xmit, eg. bridge device, breaks because no dst_entry is provided to check the skb headroom and to set the iph->frag_off field. This leads to invalid dst usage and can trigger a crash in the tunnel transmit path. Fix this by moving dst_cache and dst_cookie out of the runtime union so that they can be shared by neighbour, xfrm, and direct tunnel flows. For FLOW_OFFLOAD_XMIT_DIRECT tuples carrying tunnel metadata, preserve route state in these shared fields and release it through the common dst release path. Since dst_entry is now available to the three supported xmit modes and dst_release() already deals with NULL dst, remove the xmit type check in nft_flow_dst_release(). Moreover, skip the check if the dst entry is NULL in nf_flow_dst_check() which is now the case for the direct xmit case. Based on patch from Rein Wei <[email protected]>.
How to fix
- Linux Linux0880c4ed122d0cddc9f29a2b28f055d1f24f0fca, fa7395c02d95e51bad2952325d2d6503bfbad437 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| Linux Linux | d30301ba4b07ac92eb38353a111833b009003170 ≤ v < 0880c4ed122d0cddc9f29a2b28f055d1f24f0fca, d30301ba4b07ac92eb38353a111833b009003170 ≤ v < fa7395c02d95e51bad2952325d2d6503bfbad437, 6.19 | 0880c4ed122d0cddc9f29a2b28f055d1f24f0fca, fa7395c02d95e51bad2952325d2d6503bfbad437 |
Check your version
Choose the product and enter the version you run to see whether it falls in the affected range.
Attack Surface Management
See the assets tied to your domains, the technologies they run and known vulnerabilities in one list.