The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available.

  - net: skb: fix cross-cache free of KFENCE-allocated skb head SKB_SMALL_HEAD_CACHE_SIZE is intentionally set     to a non-power-of-2 value (e.g. 704 on x86_64) to avoid collisions with generic kmalloc bucket sizes. This     ensures that skb_kfree_head() can reliably use skb_end_offset to distinguish skb heads allocated from     skb_small_head_cache vs. generic kmalloc caches. However, when KFENCE is enabled, kfence_ksize() returns     the exact requested allocation size instead of the slab bucket size. If a caller (e.g. bpf_test_init)     allocates skb head data via kzalloc() and the requested size happens to equal SKB_SMALL_HEAD_CACHE_SIZE,     then slab_build_skb() -> ksize() returns that exact value. After subtracting skb_shared_info overhead,     skb_end_offset ends up matching SKB_SMALL_HEAD_HEADROOM, causing skb_kfree_head() to incorrectly free the     object to skb_small_head_cache instead of back to the original kmalloc cache, resulting in a slab cross-     cache free: kmem_cache_free(skbuff_small_head): Wrong slab cache. Expected skbuff_small_head but got     kmalloc-1k Fix this by always calling kfree(head) in skb_kfree_head(). This keeps the free path generic     and avoids allocator-specific misclassification for KFENCE objects. (CVE-2026-31429)

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Linux Distros Unpatched Vulnerability : CVE-2026-31429

high Nessus Plugin ID 307606

Version 1.3