CVE-2026-64552

CVE CVE-2026-64552EUVD EUVD-2026-49603Published 2026-07-27T20:10:40.000ZLast changed 2026-08-05T12:42:58.000ZCVSS 8.4

What the advisory describes

In the Linux kernel, the following vulnerability has been resolved: virtio-net: fix len check in receive_big() receive_big() bounds the device-announced length by (big_packets_num_skbfrags + 1) * PAGE_SIZE. That is still too loose: add_recvbuf_big() sets sg[1] to start at offset sizeof(struct padded_vnet_hdr) into the first page, so the chain actually carries hdr_len + (PAGE_SIZE - sizeof(padded_vnet_hdr)) + big_packets_num_skbfrags * PAGE_SIZE bytes -- 20 bytes less than the check allows for the common hdr_len == 12 case. A malicious virtio backend can announce a len in that gap. page_to_skb() then walks one frag past the page chain, storing a NULL page->private into skb_shinfo()->frags[MAX_SKB_FRAGS], which is both an out-of-bounds write past the static frag array and a NULL frag handed up the rx path. Bound len by the size add_recvbuf_big() actually advertised.

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 946dec89c41726b94d31147ec528b96af0be1b5a <38e94d63e29f4a5c6eae87ee2c02101aaa321502; 82fe78065450d2d07f36a22e2b6b44955cf5ca5b <fbeb65154583879d556ea94cb2f15888e9470f3d; 0c716703965ffc5ef4311b65cb5d84a703784717 <e6b8463b7d791f3886d7584259d6e9f06a69f12e; patch: 7.2-rc1; patch: 0; 82f9028e83944a9eee5229cbc6fee9be1de8a62d <f9451d0fd5ba635dcabb49bfe456a6db734a8986; patch: 6.1.178; 6.6.117 <6.6.145; patch: 7.1.5; patch: 6.6.145; 6.1.159 <6.1.178; 0c716703965ffc5ef4311b65cb5d84a703784717 <c7fc9adf4e006155f7f2aeda052fbcde25cdcc49; patch: 6.18.40; 0c716703965ffc5ef4311b65cb5d84a703784717 <9e5ad06ea826322ce8c58b4a68442a96f600c3c4; 3e9d89f2ecd3636bd4cbdfd0b2dfdaf58f9882e2; 6.12.58 <6.12.97; 6.17.8 <6.18; 6.18; patch: 6.12.97

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

An estate covering these products can be recorded in Patchlage. An advisory about them appears in the next morning's situation report.

Linux — Linux

Does this concern one of your customers?

This page cannot answer that — it does not know your estate. Whoever has recorded their environments gets the answer the morning after publication, together with a paragraph they can forward to the customer unedited.

Try it for 28 days

Patchlage reports hits and suspected hits. About everything else this system says nothing — neither this page nor the situation report ever claims that an estate is safe.