{"id":"CVE-2026-64552","revision":null,"records":[{"revision":"70280f611c4d48b18f2ae3a8be32a5d0","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-64552","aliases":[],"title":"virtio-net: fix len check in receive_big()","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nvirtio-net: fix len check in receive_big()\n\nreceive_big() bounds the device-announced length by\n(big_packets_num_skbfrags + 1) * PAGE_SIZE. That is still too loose:\nadd_recvbuf_big() sets sg[1] to start at offset\nsizeof(struct padded_vnet_hdr) into the first page, so the chain\nactually carries hdr_len + (PAGE_SIZE - sizeof(padded_vnet_hdr)) +\nbig_packets_num_skbfrags * PAGE_SIZE bytes -- 20 bytes less than the\ncheck allows for the common hdr_len == 12 case.\n\nA malicious virtio backend can announce a len in that gap. page_to_skb()\nthen walks one frag past the page chain, storing a NULL page->private\ninto skb_shinfo()->frags[MAX_SKB_FRAGS], which is both an out-of-bounds\nwrite past the static frag array and a NULL frag handed up the rx path.\n\nBound len by the size add_recvbuf_big() actually advertised.","state":0,"publishedAt":"2026-07-27T20:10:40.57+00:00","modifiedAt":"2026-10-19T20:48:40.599+00:00","affected":[{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n \"product\": \"Linux\",\n \"vendor\": \"Linux\",\n \"defaultStatus\": \"unaffected\",\n \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n \"programFiles\": [\n \"drivers/net/virtio_net.c\"\n ],\n \"versions\": [\n {\n \"version\": \"82f9028e83944a9eee5229cbc6fee9be1de8a62d\",\n \"lessThan\": \"f9451d0fd5ba635dcabb49bfe456a6db734a8986\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"946dec89c41726b94d31147ec528b96af0be1b5a\",\n \"lessThan\": \"38e94d63e29f4a5c6eae87ee2c02101aaa321502\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"82fe78065450d2d07f36a22e2b6b44955cf5ca5b\",\n \"lessThan\": \"fbeb65154583879d556ea94cb2f15888e9470f3d\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"0c716703965ffc5ef4311b65cb5d84a703784717\",\n \"lessThan\": \"c7fc9adf4e006155f7f2aeda052fbcde25cdcc49\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"0c716703965ffc5ef4311b65cb5d84a703784717\",\n \"lessThan\": \"e6b8463b7d791f3886d7584259d6e9f06a69f12e\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"0c716703965ffc5ef4311b65cb5d84a703784717\",\n \"lessThan\": \"9e5ad06ea826322ce8c58b4a68442a96f600c3c4\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"3e9d89f2ecd3636bd4cbdfd0b2dfdaf58f9882e2\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"6.1.159\",\n \"lessThan\": \"6.1.178\",\n \"status\": \"affected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.6.117\",\n \"lessThan\": \"6.6.145\",\n \"status\": \"affected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.12.58\",\n \"lessThan\": \"6.12.97\",\n \"status\": \"affected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.17.8\",\n \"lessThan\": \"6.18\",\n \"status\": \"affected\",\n \"versionType\": \"semver\"\n }\n ]\n }"},{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n \"product\": \"Linux\",\n \"vendor\": \"Linux\",\n \"defaultStatus\": \"affected\",\n \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n \"programFiles\": [\n \"drivers/net/virtio_net.c\"\n ],\n \"versions\": [\n {\n \"version\": \"6.18\",\n \"status\": \"affected\"\n },\n {\n \"version\": \"0\",\n \"lessThan\": \"6.18\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.1.178\",\n \"lessThanOrEqual\": \"6.1.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.6.145\",\n \"lessThanOrEqual\": \"6.6.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.12.97\",\n \"lessThanOrEqual\": \"6.12.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.18.40\",\n \"lessThanOrEqual\": \"6.18.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"7.1.5\",\n \"lessThanOrEqual\": \"7.1.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"7.2\",\n \"lessThanOrEqual\": \"*\",\n \"status\": \"unaffected\",\n \"versionType\": \"original_commit_for_fix\"\n }\n ]\n }"}],"metrics":[{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","score":8.4,"severity":"HIGH"}],"references":["https://git.kernel.org/stable/c/f9451d0fd5ba635dcabb49bfe456a6db734a8986","https://git.kernel.org/stable/c/38e94d63e29f4a5c6eae87ee2c02101aaa321502","https://git.kernel.org/stable/c/fbeb65154583879d556ea94cb2f15888e9470f3d","https://git.kernel.org/stable/c/c7fc9adf4e006155f7f2aeda052fbcde25cdcc49","https://git.kernel.org/stable/c/e6b8463b7d791f3886d7584259d6e9f06a69f12e","https://git.kernel.org/stable/c/9e5ad06ea826322ce8c58b4a68442a96f600c3c4"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-64552","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-64552","identifiers":["CVE-2026-64552"]},"retained":false,"historicalAffected":[]}],"coverage":[{"source":"cisa-kev:global","scope":"Complete CISA KEV catalog; all vendors. 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