CVE-2024-49979

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For TCP, this\ncauses a NULL ptr deref in __tcpv4_gso_segment_list_csum at\ntcp_hdr(seg->next).\n\nDetect invalid geometry due to pull, by checking head_skb size.\nDon't just drop, as this may blackhole a destination. Convert to be\nable to pass to regular skb_segment.\n\nApproach and description based on a patch by Willem de Bruijn."}], "metrics": [{"cvssV3_1": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "baseScore": 7.5, "baseSeverity": "HIGH"}, "scenarios": [{"lang": "en", "value": "AV:N - The vulnerable geometry is built by GRO from TCP packets received off the wire and destroyed on the egress GSO path of a forwarding host, so a remote attacker anywhere on the internet triggers it purely by sending a back-to-back TCP stream through the router/NAT box or container host. No local access or shared link segment is needed.\nAC:L - Once the (real-world, vendor-shipped) rx-gro-list + NAT/conntrack-helper/BPF datapath is in place, the attacker deterministically creates the condition by sending a burst of TCP segments on a helper-tracked port; there is no race, no memory-layout dependency, and nothing outside the attacker's control beyond ordinary target configuration.\nPR:N - The code path is reached from raw forwarded TCP packets with no authentication, credential, or capability check anywhere between NAPI receive and the NULL dereference in the segmentation routine.\nUI:N - Packet reception, GRO coalescing, helper linearization, and egress segmentation all occur in softirq context with no action from any local user or administrator.\nS:U - The fault occurs in kernel network code and its impact is confined to the same kernel security authority; no VM, IOMMU, or sandbox boundary is crossed.\nC:N - The defect is a NULL pointer read of `seg->next->head`/`ip_hdr(seg->next)` that faults immediately; no attacker-controlled memory is read back and no data is returned to the attacker.\nI:N - The `while ((seg = seg->next))` mangling loop terminates before any write occurs, so the checksum/address rewrites never execute on invalid memory \u2014 there is no out-of-bounds or use-after-free write primitive.\nA:H - The NULL dereference oopses inside the NET_RX softirq on the forwarding path, killing the CPU/interface and typically panicking the router, and it can be re-triggered at will by simply resending traffic."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["net/ipv4/tcp_offload.c", "net/ipv6/tcpv6_offload.c"], "versions": [{"version": "c2ea8cab368b9f25b5937a7f07ab1a66e90b8064", "lessThan": "75733986fcb0725c0033cde94764389e287b331e", "status": "affected", "versionType": "git"}, {"version": "1f2b859225eb8d1ec974214ce4a581f8c528ae57", "lessThan": "e19201b0c67da5146eaac06fd3d44bd7945c3448", "status": "affected", "versionType": "git"}, {"version": "bee88cd5bd83d40b8aec4d6cb729378f707f6197", "lessThan": "3fdd8c83e83fa5e82f1b5585245c51e0355c9f46", "status": "affected", "versionType": "git"}, {"version": "bee88cd5bd83d40b8aec4d6cb729378f707f6197", "lessThan": "2d4a83a44428de45bfe9dccb0192a3711d1097e0", "status": "affected", "versionType": "git"}, {"version": "bee88cd5bd83d40b8aec4d6cb729378f707f6197", "lessThan": "17bd3bd82f9f79f3feba15476c2b2c95a9b11ff8", "status": "affected", "versionType": "git"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["net/ipv4/tcp_offload.c", "net/ipv6/tcpv6_offload.c"], "versions": [{"version": "6.10", "status": "affected"}, {"version": "0", "lessThan": "6.10", "status": "unaffected", "versionType": "semver"}, {"version": "6.10.14", "lessThanOrEqual": "6.10.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.11.3", "lessThanOrEqual": "6.11.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.12", "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": "6.10", "versionEndExcluding": "6.10.14"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.10", "versionEndExcluding": "6.11.3"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.10", "versionEndExcluding": "6.12"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/75733986fcb0725c0033cde94764389e287b331e"}, {"url": "https://git.kernel.org/stable/c/e19201b0c67da5146eaac06fd3d44bd7945c3448"}, {"url": "https://git.kernel.org/stable/c/3fdd8c83e83fa5e82f1b5585245c51e0355c9f46"}, {"url": "https://git.kernel.org/stable/c/2d4a83a44428de45bfe9dccb0192a3711d1097e0"}, {"url": "https://git.kernel.org/stable/c/17bd3bd82f9f79f3feba15476c2b2c95a9b11ff8"}], "title": "net: gso: fix tcp fraglist segmentation after pull from frag_list", "x_generator": {"engine": "bippy-1.2.0"}}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2024-49979", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "partial"}], "version": "2.0.3", "timestamp": "2024-10-22T13:32:45.687666Z"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2024-10-22T13:38:44.690Z"}}]}}

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For TCP, this\ncauses a NULL ptr deref in __tcpv4_gso_segment_list_csum at\ntcp_hdr(seg->next).\n\nDetect invalid geometry due to pull, by checking head_skb size.\nDon't just drop, as this may blackhole a destination. Convert to be\nable to pass to regular skb_segment.\n\nApproach and description based on a patch by Willem de Bruijn."}, {"lang": "es", "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: net: gso: arregla la segmentaci\u00f3n de tcp fraglist despu\u00e9s de extraer de frag_list Detecta skbs tcp gso fraglist con geometr\u00eda corrupta (ver abajo) y p\u00e1salos a skb_segment en lugar de a skb_segment_list, ya que el primero puede segmentarlos correctamente. Skbs SKB_GSO_FRAGLIST v\u00e1lidos: consisten en dos o m\u00e1s segmentos: el head_skb contiene los encabezados de protocolo m\u00e1s el primer gso_size: uno o m\u00e1s skbs frag_list contienen exactamente un segmento: todos menos el \u00faltimo deben ser gso_size Los ganchos de ruta de datos opcionales como NAT y BPF (bpf_skb_pull_data) pueden modificar estos skbs, rompiendo estos invariantes. En casos extremos, extraen todos los datos en skb lineal. Para TCP, esto provoca un desreferenciado de ptr NULL en __tcpv4_gso_segment_list_csum en tcp_hdr(seg->next). Detecta geometr\u00eda no v\u00e1lida debido a la extracci\u00f3n, verificando el tama\u00f1o de head_skb. No lo descartes, ya que esto puede convertir un destino en un agujero negro. Convierte para poder pasar a skb_segment normal. Enfoque y descripci\u00f3n basados en un parche de Willem de Bruijn."}], "id": "CVE-2024-49979", "lastModified": "2026-08-04T11:21:04.500", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 7.5, "baseSeverity": "HIGH", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 3.6, "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary"}, {"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 5.5, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 3.6, "source": "nvd@nist.gov", "type": "Primary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2024-49979", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2024-10-22T13:32:45.687666Z", "version": "2.0.3"}}]}, "published": "2024-10-21T18:15:18.550", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/17bd3bd82f9f79f3feba15476c2b2c95a9b11ff8"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/2d4a83a44428de45bfe9dccb0192a3711d1097e0"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/3fdd8c83e83fa5e82f1b5585245c51e0355c9f46"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/75733986fcb0725c0033cde94764389e287b331e"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/e19201b0c67da5146eaac06fd3d44bd7945c3448"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-476"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: net: gso: fix tcp fraglist segmentation after pull from frag_list", "id": "2320560", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2320560"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.5", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-476", "details": ["In the Linux kernel, the following vulnerability has been resolved:\nnet: gso: fix tcp fraglist segmentation after pull from frag_list\nDetect tcp gso fraglist skbs with corrupted geometry (see below) and\npass these to skb_segment instead of skb_segment_list, as the first\ncan segment them correctly.\nValid SKB_GSO_FRAGLIST skbs\n- consist of two or more segments\n- the head_skb holds the protocol headers plus first gso_size\n- one or more frag_list skbs hold exactly one segment\n- all but the last must be gso_size\nOptional datapath hooks such as NAT and BPF (bpf_skb_pull_data) can\nmodify these skbs, breaking these invariants.\nIn extreme cases they pull all data into skb linear. For TCP, this\ncauses a NULL ptr deref in __tcpv4_gso_segment_list_csum at\ntcp_hdr(seg->next).\nDetect invalid geometry due to pull, by checking head_skb size.\nDon't just drop, as this may blackhole a destination. Convert to be\nable to pass to regular skb_segment.\nApproach and description based on a patch by Willem de Bruijn."], "name": "CVE-2024-49979", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Out of support scope", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Out of support scope", "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": "2024-10-21T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2024-49979\nhttps://nvd.nist.gov/vuln/detail/CVE-2024-49979\nhttps://lore.kernel.org/linux-cve-announce/2024102135-CVE-2024-49979-f897@gregkh/T"], "threat_severity": "Moderate"}

{}