CVE-2026-64552

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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."}], "metrics": [{"cvssV3_1": {"version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "baseScore": 8.4, "baseSeverity": "HIGH"}, "scenarios": [{"lang": "en", "value": "AV:L - The malicious input is the buffer length announced by the virtio backend (hypervisor, vhost-user/VDUSE daemon, or virtio-net hardware device), not data from a network peer; a conforming backend can never announce a length in the vulnerable gap. This is the local device-to-driver attack surface, matching how other malicious-virtio-device bugs are scored.\nAC:L - The backend deterministically controls feature negotiation, MTU (hence big_packets_num_skbfrags), and the announced len, so it can force big-packets mode and hit the 20-byte gap on the first packet with no race or memory-layout luck.\nPR:N - The attacking backend requires no credentials or privileges inside the victim kernel \u2014 it is outside the guest's security authority and simply completes an RX descriptor. No guest-side account is needed.\nUI:N - Triggered automatically in the NAPI receive path as soon as the backend completes a receive buffer; no victim action is required.\nS:U - The corruption and crash are confined to the kernel that owns the virtio-net driver, with no crossing into a different security-managing authority such as an IOMMU or hypervisor boundary.\nC:H - A controlled 16-byte out-of-bounds write past skb_shared_info into an adjacent skb head in the NAPI page-frag cache lets the attacker corrupt neighbouring network buffer metadata, which is leverageable to disclose adjacent kernel memory; nr_frags is also left one past MAX_SKB_FRAGS so downstream code reads out-of-bounds frag state.\nI:H - This is an out-of-bounds write past the end of the static skb_shinfo()->frags[] array with attacker-influenced index and size, corrupting adjacent slab/page-frag memory \u2014 per guidance an OOB write is High and is potentially leverageable for control-flow hijack.\nA:H - After the OOB write, a NULL page is stored as a frag and immediately dereferenced via compound_head() in softirq context, producing a guaranteed kernel oops; the backend can repeat this at will."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["drivers/net/virtio_net.c"], "versions": [{"version": "82f9028e83944a9eee5229cbc6fee9be1de8a62d", "lessThan": "f9451d0fd5ba635dcabb49bfe456a6db734a8986", "status": "affected", "versionType": "git"}, {"version": "946dec89c41726b94d31147ec528b96af0be1b5a", "lessThan": "38e94d63e29f4a5c6eae87ee2c02101aaa321502", "status": "affected", "versionType": "git"}, {"version": "82fe78065450d2d07f36a22e2b6b44955cf5ca5b", "lessThan": "fbeb65154583879d556ea94cb2f15888e9470f3d", "status": "affected", "versionType": "git"}, {"version": "0c716703965ffc5ef4311b65cb5d84a703784717", "lessThan": "c7fc9adf4e006155f7f2aeda052fbcde25cdcc49", 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"https://git.kernel.org/stable/c/f9451d0fd5ba635dcabb49bfe456a6db734a8986"}, {"url": "https://git.kernel.org/stable/c/38e94d63e29f4a5c6eae87ee2c02101aaa321502"}, {"url": "https://git.kernel.org/stable/c/fbeb65154583879d556ea94cb2f15888e9470f3d"}, {"url": "https://git.kernel.org/stable/c/c7fc9adf4e006155f7f2aeda052fbcde25cdcc49"}, {"url": "https://git.kernel.org/stable/c/e6b8463b7d791f3886d7584259d6e9f06a69f12e"}, {"url": "https://git.kernel.org/stable/c/9e5ad06ea826322ce8c58b4a68442a96f600c3c4"}], "title": "virtio-net: fix len check in receive_big()", "x_generator": {"engine": "bippy-1.2.0"}}, "adp": [{"x_adpType": "supplier", "providerMetadata": {"orgId": "0b142b55-0307-4c5a-b3c9-f314f3fb7c5e", "shortName": "siemens-SADP", "dateUpdated": "2026-11-10T12:49:31.438Z"}, "affected": [{"vendor": "Siemens", "product": "SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (6ES7518-4AX00-1AB0)", "versions": [{"status": "affected", "version": "V3.1.6", "lessThan": "*", "versionType": "custom"}], 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This is the local device-to-driver attack surface, matching how other malicious-virtio-device bugs are scored.\nAC:L - The backend deterministically controls feature negotiation, MTU (hence big_packets_num_skbfrags), and the announced len, so it can force big-packets mode and hit the 20-byte gap on the first packet with no race or memory-layout luck.\nPR:N - The attacking backend requires no credentials or privileges inside the victim kernel \u2014 it is outside the guest's security authority and simply completes an RX descriptor. No guest-side account is needed.\nUI:N - Triggered automatically in the NAPI receive path as soon as the backend completes a receive buffer; no victim action is required.\nS:U - The corruption and crash are confined to the kernel that owns the virtio-net driver, with no crossing into a different security-managing authority such as an IOMMU or hypervisor boundary.\nC:H - A controlled 16-byte out-of-bounds write past skb_shared_info into an adjacent skb head in the NAPI page-frag cache lets the attacker corrupt neighbouring network buffer metadata, which is leverageable to disclose adjacent kernel memory; nr_frags is also left one past MAX_SKB_FRAGS so downstream code reads out-of-bounds frag state.\nI:H - This is an out-of-bounds write past the end of the static skb_shinfo()->frags[] array with attacker-influenced index and size, corrupting adjacent slab/page-frag memory \u2014 per guidance an OOB write is High and is potentially leverageable for control-flow hijack.\nA:H - After the OOB write, a NULL page is stored as a frag and immediately dereferenced via compound_head() in softirq context, producing a guaranteed kernel oops; the backend can repeat this at will."}]}], "affected": [{"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "82f9028e83944a9eee5229cbc6fee9be1de8a62d", "lessThan": "f9451d0fd5ba635dcabb49bfe456a6db734a8986", "versionType": "git"}, {"status": "affected", "version": "946dec89c41726b94d31147ec528b96af0be1b5a", "lessThan": "38e94d63e29f4a5c6eae87ee2c02101aaa321502", "versionType": "git"}, {"status": "affected", "version": "82fe78065450d2d07f36a22e2b6b44955cf5ca5b", "lessThan": "fbeb65154583879d556ea94cb2f15888e9470f3d", "versionType": "git"}, {"status": "affected", "version": "0c716703965ffc5ef4311b65cb5d84a703784717", "lessThan": "c7fc9adf4e006155f7f2aeda052fbcde25cdcc49", "versionType": "git"}, {"status": "affected", "version": "0c716703965ffc5ef4311b65cb5d84a703784717", "lessThan": "e6b8463b7d791f3886d7584259d6e9f06a69f12e", "versionType": "git"}, {"status": "affected", "version": "0c716703965ffc5ef4311b65cb5d84a703784717", "lessThan": "9e5ad06ea826322ce8c58b4a68442a96f600c3c4", "versionType": "git"}, {"status": "affected", "version": "3e9d89f2ecd3636bd4cbdfd0b2dfdaf58f9882e2", "versionType": "git"}, {"status": "affected", "version": "6.1.159", "lessThan": "6.1.178", "versionType": "semver"}, {"status": "affected", "version": "6.6.117", "lessThan": "6.6.145", "versionType": "semver"}, {"status": "affected", "version": "6.12.58", "lessThan": "6.12.97", "versionType": "semver"}, {"status": "affected", "version": "6.17.8", "lessThan": "6.18", "versionType": "semver"}], "programFiles": ["drivers/net/virtio_net.c"], "defaultStatus": "unaffected"}, {"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "6.18"}, {"status": "unaffected", "version": "0", "lessThan": "6.18", "versionType": "semver"}, {"status": "unaffected", "version": "6.1.178", "versionType": "semver", "lessThanOrEqual": "6.1.*"}, {"status": "unaffected", "version": "6.6.145", "versionType": "semver", "lessThanOrEqual": "6.6.*"}, {"status": "unaffected", "version": "6.12.97", "versionType": "semver", "lessThanOrEqual": "6.12.*"}, {"status": "unaffected", "version": "6.18.40", "versionType": "semver", "lessThanOrEqual": "6.18.*"}, {"status": "unaffected", "version": "7.1.5", "versionType": "semver", "lessThanOrEqual": "7.1.*"}, {"status": "unaffected", "version": "7.2", "versionType": "original_commit_for_fix", "lessThanOrEqual": "*"}], "programFiles": ["drivers/net/virtio_net.c"], "defaultStatus": "affected"}], "references": [{"url": "https://git.kernel.org/stable/c/f9451d0fd5ba635dcabb49bfe456a6db734a8986"}, {"url": "https://git.kernel.org/stable/c/38e94d63e29f4a5c6eae87ee2c02101aaa321502"}, {"url": "https://git.kernel.org/stable/c/fbeb65154583879d556ea94cb2f15888e9470f3d"}, {"url": "https://git.kernel.org/stable/c/c7fc9adf4e006155f7f2aeda052fbcde25cdcc49"}, {"url": "https://git.kernel.org/stable/c/e6b8463b7d791f3886d7584259d6e9f06a69f12e"}, {"url": "https://git.kernel.org/stable/c/9e5ad06ea826322ce8c58b4a68442a96f600c3c4"}], "x_generator": {"engine": "bippy-1.2.0"}, "descriptions": [{"lang": "en", "value": "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. 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"en", "value": "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."}], "id": "CVE-2026-64552", "lastModified": "2026-11-13T18:22:56.060", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 8.4, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 2.5, "impactScore": 5.9, "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-64552", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "total"}], "role": "CISA Coordinator", "timestamp": "2026-10-16T15:42:28.527171Z", "version": "2.0.3"}}]}, "published": "2026-07-27T21:17:08.173", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/38e94d63e29f4a5c6eae87ee2c02101aaa321502"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/9e5ad06ea826322ce8c58b4a68442a96f600c3c4"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/c7fc9adf4e006155f7f2aeda052fbcde25cdcc49"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/e6b8463b7d791f3886d7584259d6e9f06a69f12e"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/f9451d0fd5ba635dcabb49bfe456a6db734a8986"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/fbeb65154583879d556ea94cb2f15888e9470f3d"}, {"source": "0b142b55-0307-4c5a-b3c9-f314f3fb7c5e", "tags": ["Third Party Advisory"], "url": "https://cert-portal.siemens.com/productcert/html/ssa-019113.html"}, {"source": "0b142b55-0307-4c5a-b3c9-f314f3fb7c5e", "tags": ["Third Party Advisory"], "url": "https://cert-portal.siemens.com/productcert/html/ssa-457936.html"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-787"}], "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary"}]}

{"bugzilla": {"description": "kernel: virtio-net: fix len check in receive_big()", "id": "2507729", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2507729"}, "csaw": false, "cvss3": {"cvss3_base_score": "7.0", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H", "status": "draft"}, "cwe": "CWE-787", "details": ["A flaw was found in the Linux kernel's virtio-net component. A malicious virtio backend can exploit an insufficient length check in the `receive_big()` function, leading to an out-of-bounds write. This vulnerability can result in a denial of service (DoS) due to system instability or crashes."], "name": "CVE-2026-64552", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2026-07-27T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-64552\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-64552\nhttps://lore.kernel.org/linux-cve-announce/2026072737-CVE-2026-64552-5e13@gregkh/T"], "threat_severity": "Important"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "[82f9028e83944a9eee5229cbc6fee9be1de8a62d,f9451d0fd5ba635dcabb49bfe456a6db734a8986]"}}, {"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "[946dec89c41726b94d31147ec528b96af0be1b5a,38e94d63e29f4a5c6eae87ee2c02101aaa321502]"}}, {"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "[82fe78065450d2d07f36a22e2b6b44955cf5ca5b,fbeb65154583879d556ea94cb2f15888e9470f3d]"}}, {"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "[0c716703965ffc5ef4311b65cb5d84a703784717,c7fc9adf4e006155f7f2aeda052fbcde25cdcc49]"}}, {"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "[0c716703965ffc5ef4311b65cb5d84a703784717,e6b8463b7d791f3886d7584259d6e9f06a69f12]"}}, {"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "[0c716703965ffc5ef4311b65cb5d84a703784717,9e5ad06ea826322ce8c58b4a68442a96f600c3c4]"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "3e9d89f2ecd3636bd4cbdfd0b2dfdaf58f9882e2"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[6.1.159,6.1.178)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[6.6.117,6.6.145)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[6.12.58,6.12.97)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "[6.17.8,6.18)"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}, {"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "6.18"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[0,6.18)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[6.1.178,6.1.*]"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[6.6.145,6.6.*]"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[6.12.97,6.12.*]"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[6.18.40,6.18.*]"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[7.1.5,7.1.*]"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[7.2-rc1,*]"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}], "created": "2026-07-28T02:45:16.783423+00:00", "updated": "2026-08-03T16:45:03.674497+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"], "weaknesses": ["CWE-122", "CWE-787"]}