{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2024-49979", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2024-10-21T12:17:06.052Z", "datePublished": "2024-10-21T18:02:25.819Z", "dateUpdated": "2026-08-05T11:40:49.381Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T11:40:49.381Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: gso: fix tcp fraglist segmentation after pull from frag_list\n\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.\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 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 — 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" } } ] } }