CVE-2025-40292

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The number of allocated frags for big packets is stored\nin vi->big_packets_num_skbfrags.\n\nBecause the host announced buffer length can be malicious (e.g. the host\nvhost_net driver's get_rx_bufs is modified to announce incorrect\nlength), we need a check in virtio_net receive path. Currently, the\ncheck is not adapted to the new change which can lead to NULL page\npointer dereference in the below while loop when receiving length that\nis larger than the allocated one.\n\nThis commit fixes the received length check corresponding to the new\nchange."}], "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-net backend/device over the virtqueue used-ring, not data from a network peer, so the attacker must be the local hypervisor/vhost backend or an attached virtio/vDPA device. This matches the CNA's treatment of comparable malicious-virtio-device bugs (CVE-2026-64456, CVE-2026-64490, CVE-2026-46123).\nAC:L - The same backend that announces the bogus length also controls feature negotiation and the advertised MTU, so it can deterministically create the vulnerable configuration (no MRG_RXBUF, no guest GSO, MTU > 1500) and then announce any length up to MAX_SKB_FRAGS * PAGE_SIZE. No race, no memory-layout luck, and it can be repeated on every received packet.\nPR:N - The attacker acts from outside the guest's privilege model entirely \u2014 a compromised host/vhost_net or hostile virtio device holds no guest credentials and needs none, and the RX path runs unconditionally once the interface is up. Consistent with PR:N on the analogous virtio device-to-guest CVEs.\nUI:N - The corrupted length is consumed automatically in the NAPI receive path as soon as the backend completes a buffer; no guest user action is needed beyond the NIC being up.\nS:U - The vulnerable component and the impacted component are both the guest kernel \u2014 memory corruption stays within the guest's virtio-net driver and skb allocations. No IOMMU, VM, or sandbox boundary is crossed by the impact itself.\nC:H - An inflated length builds an skb whose fragments cover recycled driver pages that were never written by the device, disclosing stale kernel page contents (prior packet data) up the RX stack to guest userspace or back onto the wire, and the out-of-bounds frag-array write is memory corruption leverageable for further disclosure.\nI:H - With a backend-advertised MTU \u2265 61441, `big_packets_num_skbfrags` reaches 16 and the loop writes `skb_shinfo(skb)->frags[17]`, an out-of-bounds write of an attacker-influenced frag descriptor (size field) past the fixed `frags[MAX_SKB_FRAGS]` array into adjacent heap memory, plus corruption of `nr_frags`/`skb->len` \u2014 exactly the OOB write called out in the follow-up fix e6b8463b7d79.\nA:H - Once the page chain is exhausted, `skb_add_rx_frag()` dereferences a NULL `struct page` (`compound_head`/`page_is_pfmemalloc`) and the loop then reads `NULL->private`, causing a guest kernel oops in softirq context; it is trivially repeatable on every packet."}]}], "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": "4959aebba8c06992abafa09d1e80965e0825af54", "lessThan": "82f9028e83944a9eee5229cbc6fee9be1de8a62d", "status": "affected", "versionType": "git"}, {"version": "4959aebba8c06992abafa09d1e80965e0825af54", "lessThan": "946dec89c41726b94d31147ec528b96af0be1b5a", "status": "affected", "versionType": "git"}, {"version": "4959aebba8c06992abafa09d1e80965e0825af54", "lessThan": "82fe78065450d2d07f36a22e2b6b44955cf5ca5b", "status": "affected", "versionType": "git"}, {"version": "4959aebba8c06992abafa09d1e80965e0825af54", "lessThan": "3e9d89f2ecd3636bd4cbdfd0b2dfdaf58f9882e2", "status": "affected", "versionType": "git"}, {"version": "4959aebba8c06992abafa09d1e80965e0825af54", "lessThan": "0c716703965ffc5ef4311b65cb5d84a703784717", "status": "affected", "versionType": "git"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["drivers/net/virtio_net.c"], "versions": [{"version": "6.1", "status": "affected"}, {"version": "0", "lessThan": "6.1", "status": "unaffected", "versionType": "semver"}, {"version": "6.1.159", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.6.117", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.58", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.17.8", "lessThanOrEqual": "6.17.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.18", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix"}]}], "cpeApplicability": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.1", "versionEndExcluding": "6.1.159"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.1", "versionEndExcluding": "6.6.117"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.1", "versionEndExcluding": "6.12.58"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.1", "versionEndExcluding": "6.17.8"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.1", "versionEndExcluding": "6.18"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/82f9028e83944a9eee5229cbc6fee9be1de8a62d"}, {"url": "https://git.kernel.org/stable/c/946dec89c41726b94d31147ec528b96af0be1b5a"}, {"url": "https://git.kernel.org/stable/c/82fe78065450d2d07f36a22e2b6b44955cf5ca5b"}, {"url": "https://git.kernel.org/stable/c/3e9d89f2ecd3636bd4cbdfd0b2dfdaf58f9882e2"}, {"url": "https://git.kernel.org/stable/c/0c716703965ffc5ef4311b65cb5d84a703784717"}], "title": "virtio-net: fix received length check in big packets", "x_generator": {"engine": "bippy-1.2.0"}}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2025-40292", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "total"}], "version": "2.0.3", "timestamp": "2026-10-15T21:58:49.590462Z"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-10-15T22:02:42.769Z"}}]}}

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This matches the CNA's treatment of comparable malicious-virtio-device bugs (CVE-2026-64456, CVE-2026-64490, CVE-2026-46123).\nAC:L - The same backend that announces the bogus length also controls feature negotiation and the advertised MTU, so it can deterministically create the vulnerable configuration (no MRG_RXBUF, no guest GSO, MTU > 1500) and then announce any length up to MAX_SKB_FRAGS * PAGE_SIZE. No race, no memory-layout luck, and it can be repeated on every received packet.\nPR:N - The attacker acts from outside the guest's privilege model entirely \u2014 a compromised host/vhost_net or hostile virtio device holds no guest credentials and needs none, and the RX path runs unconditionally once the interface is up. Consistent with PR:N on the analogous virtio device-to-guest CVEs.\nUI:N - The corrupted length is consumed automatically in the NAPI receive path as soon as the backend completes a buffer; no guest user action is needed beyond the NIC being up.\nS:U - The vulnerable component and the impacted component are both the guest kernel \u2014 memory corruption stays within the guest's virtio-net driver and skb allocations. No IOMMU, VM, or sandbox boundary is crossed by the impact itself.\nC:H - An inflated length builds an skb whose fragments cover recycled driver pages that were never written by the device, disclosing stale kernel page contents (prior packet data) up the RX stack to guest userspace or back onto the wire, and the out-of-bounds frag-array write is memory corruption leverageable for further disclosure.\nI:H - With a backend-advertised MTU \u2265 61441, `big_packets_num_skbfrags` reaches 16 and the loop writes `skb_shinfo(skb)->frags[17]`, an out-of-bounds write of an attacker-influenced frag descriptor (size field) past the fixed `frags[MAX_SKB_FRAGS]` array into adjacent heap memory, plus corruption of `nr_frags`/`skb->len` \u2014 exactly the OOB write called out in the follow-up fix e6b8463b7d79.\nA:H - Once the page chain is exhausted, `skb_add_rx_frag()` dereferences a NULL `struct page` (`compound_head`/`page_is_pfmemalloc`) and the loop then reads `NULL->private`, causing a guest kernel oops in softirq context; it is trivially repeatable on every packet."}]}], "affected": [{"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "4959aebba8c06992abafa09d1e80965e0825af54", "lessThan": "82f9028e83944a9eee5229cbc6fee9be1de8a62d", "versionType": "git"}, {"status": "affected", "version": "4959aebba8c06992abafa09d1e80965e0825af54", "lessThan": "946dec89c41726b94d31147ec528b96af0be1b5a", "versionType": "git"}, {"status": "affected", "version": "4959aebba8c06992abafa09d1e80965e0825af54", "lessThan": "82fe78065450d2d07f36a22e2b6b44955cf5ca5b", "versionType": "git"}, {"status": "affected", "version": "4959aebba8c06992abafa09d1e80965e0825af54", "lessThan": "3e9d89f2ecd3636bd4cbdfd0b2dfdaf58f9882e2", "versionType": "git"}, {"status": "affected", "version": "4959aebba8c06992abafa09d1e80965e0825af54", "lessThan": "0c716703965ffc5ef4311b65cb5d84a703784717", "versionType": "git"}], "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": "6.1"}, {"status": "unaffected", "version": "0", "lessThan": "6.1", "versionType": "semver"}, {"status": "unaffected", "version": "6.1.159", "versionType": "semver", "lessThanOrEqual": "6.1.*"}, {"status": "unaffected", "version": "6.6.117", "versionType": "semver", "lessThanOrEqual": "6.6.*"}, {"status": "unaffected", "version": "6.12.58", "versionType": "semver", "lessThanOrEqual": "6.12.*"}, {"status": "unaffected", "version": "6.17.8", "versionType": "semver", "lessThanOrEqual": "6.17.*"}, {"status": "unaffected", "version": "6.18", "versionType": "original_commit_for_fix", "lessThanOrEqual": "*"}], "programFiles": ["drivers/net/virtio_net.c"], "defaultStatus": "affected"}], "references": [{"url": "https://git.kernel.org/stable/c/82f9028e83944a9eee5229cbc6fee9be1de8a62d"}, {"url": "https://git.kernel.org/stable/c/946dec89c41726b94d31147ec528b96af0be1b5a"}, {"url": "https://git.kernel.org/stable/c/82fe78065450d2d07f36a22e2b6b44955cf5ca5b"}, {"url": "https://git.kernel.org/stable/c/3e9d89f2ecd3636bd4cbdfd0b2dfdaf58f9882e2"}, {"url": "https://git.kernel.org/stable/c/0c716703965ffc5ef4311b65cb5d84a703784717"}], "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 received length check in big packets\n\nSince commit 4959aebba8c0 (\"virtio-net: use mtu size as buffer length\nfor big packets\"), when guest gso is off, the allocated size for big\npackets is not MAX_SKB_FRAGS * PAGE_SIZE anymore but depends on\nnegotiated MTU. The number of allocated frags for big packets is stored\nin vi->big_packets_num_skbfrags.\n\nBecause the host announced buffer length can be malicious (e.g. the host\nvhost_net driver's get_rx_bufs is modified to announce incorrect\nlength), we need a check in virtio_net receive path. Currently, the\ncheck is not adapted to the new change which can lead to NULL page\npointer dereference in the below while loop when receiving length that\nis larger than the allocated one.\n\nThis commit fixes the received length check corresponding to the new\nchange."}], "cpeApplicability": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.1.159", "versionStartIncluding": "6.1"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.6.117", "versionStartIncluding": "6.1"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.12.58", "versionStartIncluding": "6.1"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.17.8", "versionStartIncluding": "6.1"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.18", "versionStartIncluding": "6.1"}], "operator": "OR"}]}], "providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T12:09:18.395Z"}}}, "cveMetadata": {"cveId": "CVE-2025-40292", "state": "PUBLISHED", "dateUpdated": "2026-10-15T22:02:42.769Z", "dateReserved": "2025-04-16T07:20:57.185Z", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "datePublished": "2025-12-08T00:46:15.761Z", "assignerShortName": "Linux"}, "dataVersion": "5.2"}

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The number of allocated frags for big packets is stored\nin vi->big_packets_num_skbfrags.\n\nBecause the host announced buffer length can be malicious (e.g. the host\nvhost_net driver's get_rx_bufs is modified to announce incorrect\nlength), we need a check in virtio_net receive path. Currently, the\ncheck is not adapted to the new change which can lead to NULL page\npointer dereference in the below while loop when receiving length that\nis larger than the allocated one.\n\nThis commit fixes the received length check corresponding to the new\nchange."}, {"lang": "es", "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nvirtio-net: corrige la comprobaci\u00f3n de longitud recibida en paquetes grandes\n\nDesde el commit 4959aebba8c0 ('virtio-net: usar el tama\u00f1o de mtu como longitud de b\u00fafer para paquetes grandes'), cuando el gso del invitado est\u00e1 desactivado, el tama\u00f1o asignado para paquetes grandes ya no es MAX_SKB_FRAGS * PAGE_SIZE, sino que depende de la MTU negociada. El n\u00famero de fragmentos asignados para paquetes grandes se almacena en vi -> big_packets_num_skbfrags.\n\nDebido a que la longitud del b\u00fafer anunciada por el host puede ser maliciosa (por ejemplo, el get_rx_bufs del controlador vhost_net del host se modifica para anunciar una longitud incorrecta), necesitamos una comprobaci\u00f3n en la ruta de recepci\u00f3n de virtio_net. Actualmente, la comprobaci\u00f3n no est\u00e1 adaptada al nuevo cambio, lo que puede llevar a una desreferencia de puntero de p\u00e1gina NULL en el bucle 'while' inferior al recibir una longitud mayor que la asignada.\n\nEste commit corrige la comprobaci\u00f3n de longitud recibida correspondiente al nuevo cambio."}], "id": "CVE-2025-40292", "lastModified": "2026-10-15T22:19:07.123", "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-2025-40292", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "total"}], "role": "CISA Coordinator", "timestamp": "2026-10-15T21:58:49.590462Z", "version": "2.0.3"}}]}, "published": "2025-12-08T01:16:01.160", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/0c716703965ffc5ef4311b65cb5d84a703784717"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/3e9d89f2ecd3636bd4cbdfd0b2dfdaf58f9882e2"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/82f9028e83944a9eee5229cbc6fee9be1de8a62d"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/82fe78065450d2d07f36a22e2b6b44955cf5ca5b"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/946dec89c41726b94d31147ec528b96af0be1b5a"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Deferred"}

{"bugzilla": {"description": "kernel: virtio-net: fix received length check in big packets", "id": "2419948", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2419948"}, "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"}, "details": ["No description is available for this CVE."], "name": "CVE-2025-40292", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Out of support scope", "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": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2025-12-08T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2025-40292\nhttps://nvd.nist.gov/vuln/detail/CVE-2025-40292\nhttps://lore.kernel.org/linux-cve-announce/2025120818-CVE-2025-40292-e613@gregkh/T"], "threat_severity": "Moderate"}

{}