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CVE PROGRAM SOURCE RECORD8.4 High

CVE-2026-64552

virtio-net: fix len check in receive_big()

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Status
Published
Published
Updated
Assigning organization
Linux

Description

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.

Affected products

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

Linux Linux

Default version status: unaffected

  • 82f9028e83944a9eee5229cbc6fee9be1de8a62d to < f9451d0fd5ba635dcabb49bfe456a6db734a8986affected
  • 946dec89c41726b94d31147ec528b96af0be1b5a to < 38e94d63e29f4a5c6eae87ee2c02101aaa321502affected
  • 82fe78065450d2d07f36a22e2b6b44955cf5ca5b to < fbeb65154583879d556ea94cb2f15888e9470f3daffected
  • 0c716703965ffc5ef4311b65cb5d84a703784717 to < c7fc9adf4e006155f7f2aeda052fbcde25cdcc49affected
  • 0c716703965ffc5ef4311b65cb5d84a703784717 to < e6b8463b7d791f3886d7584259d6e9f06a69f12eaffected
  • 0c716703965ffc5ef4311b65cb5d84a703784717 to < 9e5ad06ea826322ce8c58b4a68442a96f600c3c4affected
  • 3e9d89f2ecd3636bd4cbdfd0b2dfdaf58f9882e2affected
  • 6.1.159 to < 6.1.178affected
  • 6.6.117 to < 6.6.145affected
  • 6.12.58 to < 6.12.97affected
  • 6.17.8 to < 6.18affected

Linux Linux

Default version status: affected

  • 6.18affected
  • 0 to < 6.18unaffected
  • 6.1.178 to ≤ 6.1.*unaffected
  • 6.6.145 to ≤ 6.6.*unaffected
  • 6.12.97 to ≤ 6.12.*unaffected
  • 6.18.40 to ≤ 6.18.*unaffected
  • 7.1.5 to ≤ 7.1.*unaffected
  • 7.2 to ≤ *unaffected

References