CVE-2026-64552 (GCVE-0-2026-64552)
Vulnerability from cvelistv5
Published
2026-07-27 20:10
Modified
2026-10-19 20:48
Severity ?
8.4 (High) - CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Summary
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.
References
Impacted products
Vendor Product Version
Linux Linux Version: 82f9028e83944a9eee5229cbc6fee9be1de8a62d
Version: 946dec89c41726b94d31147ec528b96af0be1b5a
Version: 82fe78065450d2d07f36a22e2b6b44955cf5ca5b
Version: 0c716703965ffc5ef4311b65cb5d84a703784717
Version: 0c716703965ffc5ef4311b65cb5d84a703784717
Version: 0c716703965ffc5ef4311b65cb5d84a703784717
Version: 3e9d89f2ecd3636bd4cbdfd0b2dfdaf58f9882e2
Version: 6.1.159   ≤
Version: 6.6.117   ≤
Version: 6.12.58   ≤
Version: 6.17.8   ≤
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      "dataVersion": "5.2"
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}


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