CVE-2026-90160
UnknownSummary
In the Linux kernel, the lwt_bpf module has a vulnerability due to incorrect headroom checking after an LWT_XMIT BPF program runs. The check uses hard_header_len, which does not account for alignment required by the neighbour cached-header path (neigh_hh_output), potentially leading to packet drops.
Risk Assessment
This can lead to packet loss and disruption of network communication, affecting service availability.
Recommendation
Apply a kernel patch that uses LL_RESERVED_SPACE(dst->dev) in the post-BPF headroom check.
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Original NVD description (English source)
In the Linux kernel, the following vulnerability has been resolved: lwt_bpf: Restore reserved headroom after xmit program ip_finish_output2() expands an skb to LL_RESERVED_SPACE(dev) before LWT xmit. An LWT_XMIT BPF program can then modify the skb head and still return BPF_OK, so bpf_xmit() rechecks the remaining headroom before the skb continues to neighbour output. That recheck uses dst->dev->hard_header_len. This is not enough for the neighbour cached-header path: neigh_hh_output() copies the cached hardware header using the aligned hh_cache size, HH_DATA_MOD for short headers or HH_DATA_ALIGN(hh_len) otherwise. On Ethernet, hard_header_len is 14 but the cached copy needs 16 bytes. If an LWT_XMIT BPF program calls bpf_skb_change_head(skb, 1, 0), the skb can still have 15 bytes of headroom after the program. The existing check accepts that, after which neigh_hh_output() hits its headroom warning and drops the skb. Use LL_RESERVED_SPACE(dst->dev) in the post-BPF headroom check to match the reservation made before LWT xmit.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS