Vulnerability-Lookup

FKIE_CVE-2024-49978

Vulnerability from fkie_nvd - Published: 2024-10-21 18:15 - Updated: 2026-08-04 11:21

Severity

7.5 (High) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
5.5 (Medium) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Summary

In the Linux kernel, the following vulnerability has been resolved: gso: fix udp gso fraglist segmentation after pull from frag_list Detect gso fraglist skbs with corrupted geometry (see below) and pass these to skb_segment instead of skb_segment_list, as the first can segment them correctly. Valid SKB_GSO_FRAGLIST skbs - consist of two or more segments - the head_skb holds the protocol headers plus first gso_size - one or more frag_list skbs hold exactly one segment - all but the last must be gso_size Optional datapath hooks such as NAT and BPF (bpf_skb_pull_data) can modify these skbs, breaking these invariants. In extreme cases they pull all data into skb linear. For UDP, this causes a NULL ptr deref in __udpv4_gso_segment_list_csum at udp_hdr(seg->next)->dest. Detect invalid geometry due to pull, by checking head_skb size. Don't just drop, as this may blackhole a destination. Convert to be able to pass to regular skb_segment.

References

URL	Tags
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/080e6c9a3908de193a48f646c5ce1bfb15676ffc	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/33e28acf42ee863f332a958bfc2f1a284a3659df	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/3cd00d2e3655fad3bda96dc1ebf17b6495f86fea	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/a1e40ac5b5e9077fe1f7ae0eb88034db0f9ae1ab	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/af3122f5fdc0d00581d6e598a668df6bf54c9daa	Patch
af854a3a-2127-422b-91ae-364da2661108	https://lists.debian.org/debian-lts-announce/2025/01/msg00001.html

Impacted products

Vendor	Product	Version
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	6.12

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
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          "product": "Linux",
          "programFiles": [
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      "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-\u003enext)-\u003edest.\n\nDetect invalid geometry due to pull, by checking head_skb size.\nDon\u0027t 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-\u0026gt;next)-\u0026gt;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",
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}

CVE-2024-49978 (GCVE-0-2024-49978)

Vulnerability from cvelistv5 – Published: 2024-10-21 18:02 – Updated: 2026-08-05 11:40

Title

gso: fix udp gso fraglist segmentation after pull from frag_list

Summary

Severity

7.5 (High)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2024-10-22 13:32 UTC

Assigner

Linux mitre root

References

6 references

URL	Tags
https://git.kernel.org/stable/c/080e6c9a3908de193…
https://git.kernel.org/stable/c/af3122f5fdc0d0058…
https://git.kernel.org/stable/c/33e28acf42ee863f3…
https://git.kernel.org/stable/c/3cd00d2e3655fad3b…
https://git.kernel.org/stable/c/a1e40ac5b5e9077fe…
https://lists.debian.org/debian-lts-announce/2025…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 9fd1ff5d2ac7181844735806b0a703c942365291 , < 080e6c9a3908de193a48f646c5ce1bfb15676ffc (git) Affected: 9fd1ff5d2ac7181844735806b0a703c942365291 , < af3122f5fdc0d00581d6e598a668df6bf54c9daa (git) Affected: 9fd1ff5d2ac7181844735806b0a703c942365291 , < 33e28acf42ee863f332a958bfc2f1a284a3659df (git) Affected: 9fd1ff5d2ac7181844735806b0a703c942365291 , < 3cd00d2e3655fad3bda96dc1ebf17b6495f86fea (git) Affected: 9fd1ff5d2ac7181844735806b0a703c942365291 , < a1e40ac5b5e9077fe1f7ae0eb88034db0f9ae1ab (git)
Linux	Linux	Affected: 5.6 Unaffected: 0 , < 5.6 (semver) Unaffected: 6.1.113 , ≤ 6.1.* (semver) Unaffected: 6.6.55 , ≤ 6.6.* (semver) Unaffected: 6.10.14 , ≤ 6.10.* (semver) Unaffected: 6.11.3 , ≤ 6.11.* (semver) Unaffected: 6.12 , ≤ * (original_commit_for_fix)

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2024-49978",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2024-10-22T13:32:53.403446Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2024-10-22T13:38:44.845Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      },
      {
        "providerMetadata": {
          "dateUpdated": "2025-11-03T22:23:59.132Z",
          "orgId": "af854a3a-2127-422b-91ae-364da2661108",
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        },
        "references": [
          {
            "url": "https://lists.debian.org/debian-lts-announce/2025/01/msg00001.html"
          }
        ],
        "title": "CVE Program Container"
      }
    ],
    "cna": {
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          "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-\u003enext)-\u003edest.\n\nDetect invalid geometry due to pull, by checking head_skb size.\nDon\u0027t just drop, as this may blackhole a destination. Convert to be\nable to pass to regular skb_segment."
        }
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      "metrics": [
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            {
              "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-\u003enext)-\u003edest); 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."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-05T11:40:48.306Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "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"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2024-49978",
    "datePublished": "2024-10-21T18:02:25.151Z",
    "dateReserved": "2024-10-21T12:17:06.052Z",
    "dateUpdated": "2026-08-05T11:40:48.306Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.