CVE-2026-64566

CVE CVE-2026-64566EUVD EUVD-2026-53260Published 2026-08-05T08:06:18.000ZLast changed 2026-08-08T15:13:07.000ZCVSS 9.8

What the advisory describes

In the Linux kernel, the following vulnerability has been resolved: xfrm: iptfs: propagate SKBFL_SHARED_FRAG in iptfs_skb_add_frags() When iptfs_skb_add_frags() copies frag references from the source frag walk into a new SKB, it increments the page reference count via __skb_frag_ref() but does not propagate SKBFL_SHARED_FRAG to the destination SKB's skb_shinfo->flags. If the source SKB carries shared frags (e.g. from a page-pool backed receive path), the new inner SKB will appear to ESP as having privately owned frags. A subsequent esp_input() call for a nested transport-mode SA then takes the no-COW fast path and decrypts in place, writing over pages that are still referenced by the outer IPTFS SKB. This causes kernel-visible memory corruption and can trigger a panic. All other frag-transfer helpers in the kernel (skb_try_coalesce, skb_gro_receive, __pskb_copy_fclone, skb_shift, skb_segment) correctly propagate SKBFL_SHARED_FRAG; align iptfs_skb_add_frags() with this convention by setting the flag inside the loop immediately after __skb_frag_ref() and nr_frags++, so every exit path that attaches a frag unconditionally propagates SKBFL_SHARED_FRAG.

Source: EUVD (ENISA), in the words of the advisory.

Products the advisory names

These come from the advisory itself, not from any check we performed.

Linux — Linux patch: 6.18.42; patch: 0; 5f2b6a9095743a6bf1f34c43c4fe78fa8bdf5ad7 <430ea57d6daf765e88f90046afbfd1e071cb7200; 5f2b6a9095743a6bf1f34c43c4fe78fa8bdf5ad7 <ffd64e0717efd83fbf3396ab4e5ac6d795dac4d0; 5f2b6a9095743a6bf1f34c43c4fe78fa8bdf5ad7 <d8aaf06b29f5a0b6186cf68d21c7d63678ee3891; patch: 7.1.6; 6.14; patch: 7.2-rc4

The versions shown are the advisory's own. Patchlage compares no version numbers and derives no judgement from them — which version is installed is something a person has to look up.

Carried in the product catalogue

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Linux — Linux

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