{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2024-49978", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2024-10-21T12:17:06.052Z", "datePublished": "2024-10-21T18:02:25.151Z", "dateUpdated": "2026-08-05T11:40:48.306Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T11:40:48.306Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ngso: fix udp gso fraglist segmentation after pull from frag_list\n\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.\n\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\n\nOptional datapath hooks such as NAT and BPF (bpf_skb_pull_data) can\nmodify these skbs, breaking these invariants.\n\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.\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 → ip_forward → 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" } } ] } }