CVE-2024-49978

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For UDP, this\ncauses a NULL ptr deref in __udpv4_gso_segment_list_csum at\nudp_hdr(seg->next)->dest.\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."}], "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 code is reached entirely by processing UDP packets received from the network and re-emitted on the IP forwarding path (ip_rcv \u2192 ip_forward \u2192 GSO segmentation), with no local access required. A remote, multi-hop attacker sending a burst of routed UDP datagrams through a Linux router/NAT gateway or tethering device triggers it.\nAC:L - On an affected device (GRO fraglist enabled plus a UDP NAT helper or tc/BPF program that pulls data), the attacker simply sends back-to-back UDP packets of the same flow; GRO coalescing and the subsequent full linearize occur deterministically, with no race to win and no memory layout to groom.\nPR:N - The packets are handled in the forwarding/softirq path before any authentication or authorization; the attacker needs no account, credentials, or privileges on the target at all.\nUI:N - Segmentation happens automatically as the kernel forwards attacker-supplied packets out of the egress device; no action by any local user or administrator is needed.\nS:U - The NULL dereference crashes the kernel that owns the vulnerable network stack, so the vulnerable and impacted components share the same security authority with no boundary crossed.\nC:N - The defect is a read of a fixed low address derived from a NULL sk_buff pointer (udp_hdr(seg->next)->dest); there is no attacker-controlled offset, no out-of-bounds read of valid memory, and no data returned to the attacker.\nI:N - Execution faults on the comparison before any write occurs in __udpv4_gso_segment_csum, so no kernel memory, packet data, or control flow is modified.\nA:H - The NULL pointer dereference occurs in softirq/NAPI context, producing an oops that Linux escalates to a full kernel panic (\"fatal exception in interrupt\"), and it can be re-triggered at will by resending UDP traffic."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["net/ipv4/udp_offload.c"], "versions": [{"version": "9fd1ff5d2ac7181844735806b0a703c942365291", "lessThan": "080e6c9a3908de193a48f646c5ce1bfb15676ffc", "status": "affected", "versionType": "git"}, {"version": "9fd1ff5d2ac7181844735806b0a703c942365291", "lessThan": "af3122f5fdc0d00581d6e598a668df6bf54c9daa", "status": "affected", "versionType": "git"}, {"version": "9fd1ff5d2ac7181844735806b0a703c942365291", "lessThan": "33e28acf42ee863f332a958bfc2f1a284a3659df", "status": "affected", "versionType": "git"}, {"version": "9fd1ff5d2ac7181844735806b0a703c942365291", "lessThan": "3cd00d2e3655fad3bda96dc1ebf17b6495f86fea", "status": "affected", "versionType": "git"}, {"version": "9fd1ff5d2ac7181844735806b0a703c942365291", "lessThan": "a1e40ac5b5e9077fe1f7ae0eb88034db0f9ae1ab", "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/udp_offload.c"], "versions": [{"version": "5.6", "status": "affected"}, {"version": "0", "lessThan": "5.6", "status": "unaffected", "versionType": "semver"}, {"version": "6.1.113", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.6.55", "lessThanOrEqual": "6.6.*", "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": "5.6", "versionEndExcluding": "6.1.113"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.6", "versionEndExcluding": "6.6.55"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.6", "versionEndExcluding": "6.10.14"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.6", "versionEndExcluding": "6.11.3"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.6", "versionEndExcluding": "6.12"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/080e6c9a3908de193a48f646c5ce1bfb15676ffc"}, {"url": "https://git.kernel.org/stable/c/af3122f5fdc0d00581d6e598a668df6bf54c9daa"}, {"url": "https://git.kernel.org/stable/c/33e28acf42ee863f332a958bfc2f1a284a3659df"}, {"url": "https://git.kernel.org/stable/c/3cd00d2e3655fad3bda96dc1ebf17b6495f86fea"}, {"url": "https://git.kernel.org/stable/c/a1e40ac5b5e9077fe1f7ae0eb88034db0f9ae1ab"}], "title": "gso: fix udp gso fraglist segmentation after pull from frag_list", "x_generator": {"engine": "bippy-1.2.0"}}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2024-49978", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "partial"}], "version": "2.0.3", "timestamp": "2024-10-22T13:32:53.403446Z"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2024-10-22T13:38:44.845Z"}}, {"title": "CVE Program Container", "references": [{"url": "https://lists.debian.org/debian-lts-announce/2025/01/msg00001.html"}], "providerMetadata": {"orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2025-11-03T22:23:59.132Z"}}]}}

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For UDP, this\ncauses a NULL ptr deref in __udpv4_gso_segment_list_csum at\nudp_hdr(seg->next)->dest.\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."}], "cpeApplicability": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.1.113", "versionStartIncluding": "5.6"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.6.55", "versionStartIncluding": "5.6"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.10.14", "versionStartIncluding": "5.6"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.11.3", "versionStartIncluding": "5.6"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.12", "versionStartIncluding": "5.6"}], "operator": "OR"}]}], "providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-05-11T20:43:12.969Z"}}}, "cveMetadata": {"cveId": "CVE-2024-49978", "state": "PUBLISHED", "dateUpdated": "2026-05-11T20:43:12.969Z", "dateReserved": "2024-10-21T12:17:06.052Z", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "datePublished": "2024-10-21T18:02:25.151Z", "assignerShortName": "Linux"}, "dataVersion": "5.2"}

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For UDP, this\ncauses a NULL ptr deref in __udpv4_gso_segment_list_csum at\nudp_hdr(seg->next)->dest.\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."}, {"lang": "es", "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: gso: arregla la segmentaci\u00f3n de fraglist gso udp despu\u00e9s de extraer de frag_list Detecta skbs de fraglist gso 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 primero gso_size: uno o m\u00e1s skbs de 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 UDP, esto provoca un desreferenciado de ptr NULL en __udpv4_gso_segment_list_csum en udp_hdr(seg->next)->dest. Detecta geometr\u00eda no v\u00e1lida debido a la extracci\u00f3n, verificando el tama\u00f1o de head_skb. No la elimines, ya que esto puede convertir un destino en un agujero negro. Convierte para poder pasar a skb_segment normal."}], "id": "CVE-2024-49978", "lastModified": "2026-08-04T11:21:04.200", "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-2024-49978", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2024-10-22T13:32:53.403446Z", "version": "2.0.3"}}]}, "published": "2024-10-21T18:15:18.483", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/080e6c9a3908de193a48f646c5ce1bfb15676ffc"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/33e28acf42ee863f332a958bfc2f1a284a3659df"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/3cd00d2e3655fad3bda96dc1ebf17b6495f86fea"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/a1e40ac5b5e9077fe1f7ae0eb88034db0f9ae1ab"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/af3122f5fdc0d00581d6e598a668df6bf54c9daa"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "url": "https://lists.debian.org/debian-lts-announce/2025/01/msg00001.html"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-476"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: gso: fix udp gso fraglist segmentation after pull from frag_list", "id": "2320561", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2320561"}, "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:\ngso: fix udp gso fraglist segmentation after pull from frag_list\nDetect 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 UDP, this\ncauses a NULL ptr deref in __udpv4_gso_segment_list_csum at\nudp_hdr(seg->next)->dest.\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."], "name": "CVE-2024-49978", "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": "Will not fix", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Will not fix", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Will not fix", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Will not fix", "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-2024-49978\nhttps://nvd.nist.gov/vuln/detail/CVE-2024-49978\nhttps://lore.kernel.org/linux-cve-announce/2024102135-CVE-2024-49978-2bff@gregkh/T"], "threat_severity": "Moderate"}

{}