{"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"}}]}}