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CVE-2024-35884 (GCVE-0-2024-35884)

Vulnerability from cvelistv5 – Published: 2024-05-19 08:34 – Updated: 2026-08-05 11:30
VLAI
Title
udp: do not accept non-tunnel GSO skbs landing in a tunnel
Summary
In the Linux kernel, the following vulnerability has been resolved: udp: do not accept non-tunnel GSO skbs landing in a tunnel When rx-udp-gro-forwarding is enabled UDP packets might be GROed when being forwarded. If such packets might land in a tunnel this can cause various issues and udp_gro_receive makes sure this isn't the case by looking for a matching socket. This is performed in udp4/6_gro_lookup_skb but only in the current netns. This is an issue with tunneled packets when the endpoint is in another netns. In such cases the packets will be GROed at the UDP level, which leads to various issues later on. The same thing can happen with rx-gro-list. We saw this with geneve packets being GROed at the UDP level. In such case gso_size is set; later the packet goes through the geneve rx path, the geneve header is pulled, the offset are adjusted and frag_list skbs are not adjusted with regard to geneve. When those skbs hit skb_fragment, it will misbehave. Different outcomes are possible depending on what the GROed skbs look like; from corrupted packets to kernel crashes. One example is a BUG_ON[1] triggered in skb_segment while processing the frag_list. Because gso_size is wrong (geneve header was pulled) skb_segment thinks there is "geneve header size" of data in frag_list, although it's in fact the next packet. The BUG_ON itself has nothing to do with the issue. This is only one of the potential issues. Looking up for a matching socket in udp_gro_receive is fragile: the lookup could be extended to all netns (not speaking about performances) but nothing prevents those packets from being modified in between and we could still not find a matching socket. It's OK to keep the current logic there as it should cover most cases but we also need to make sure we handle tunnel packets being GROed too early. This is done by extending the checks in udp_unexpected_gso: GSO packets lacking the SKB_GSO_UDP_TUNNEL/_CSUM bits and landing in a tunnel must be segmented. [1] kernel BUG at net/core/skbuff.c:4408! RIP: 0010:skb_segment+0xd2a/0xf70 __udp_gso_segment+0xaa/0x560
Severity
9.8 (Critical)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
8.8 (High)
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2024-05-28 19:37 UTC
CWE
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 9fd1ff5d2ac7181844735806b0a703c942365291 , < 3391b157780bbedf8ef9f202cbf10ee90bf6b0f8 (git)
Affected: 9fd1ff5d2ac7181844735806b0a703c942365291 , < d49ae15a5767d4e9ef8bbb79e42df1bfebc94670 (git)
Affected: 9fd1ff5d2ac7181844735806b0a703c942365291 , < d12245080cb259d82b34699f6cd4ec11bdb688bd (git)
Affected: 9fd1ff5d2ac7181844735806b0a703c942365291 , < 3001e7aa43d6691db2a878b0745b854bf12ddd19 (git)
Affected: 9fd1ff5d2ac7181844735806b0a703c942365291 , < 35fe0e0b5c00bef7dde74842a2564c43856fbce4 (git)
Affected: 9fd1ff5d2ac7181844735806b0a703c942365291 , < 3d010c8031e39f5fa1e8b13ada77e0321091011f (git)
guessed Create a notification for this product.
Linux Linux Affected: 5.6
Unaffected: 0 , < 5.6 (semver)
Unaffected: 5.10.215 , ≤ 5.10.* (semver)
Unaffected: 5.15.154 , ≤ 5.15.* (semver)
Unaffected: 6.1.85 , ≤ 6.1.* (semver)
Unaffected: 6.6.26 , ≤ 6.6.* (semver)
Unaffected: 6.8.5 , ≤ 6.8.* (semver)
Unaffected: 6.9 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
Siemens SIMATIC S7-1500 TM MFP - GNU/Linux subsystem Affected: 0 , < * (custom)
guessed Create a notification for this product.
Show details on NVD website
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            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nudp: do not accept non-tunnel GSO skbs landing in a tunnel\n\nWhen rx-udp-gro-forwarding is enabled UDP packets might be GROed when\nbeing forwarded. If such packets might land in a tunnel this can cause\nvarious issues and udp_gro_receive makes sure this isn\u0027t the case by\nlooking for a matching socket. This is performed in\nudp4/6_gro_lookup_skb but only in the current netns. This is an issue\nwith tunneled packets when the endpoint is in another netns. In such\ncases the packets will be GROed at the UDP level, which leads to various\nissues later on. The same thing can happen with rx-gro-list.\n\nWe saw this with geneve packets being GROed at the UDP level. In such\ncase gso_size is set; later the packet goes through the geneve rx path,\nthe geneve header is pulled, the offset are adjusted and frag_list skbs\nare not adjusted with regard to geneve. When those skbs hit\nskb_fragment, it will misbehave. Different outcomes are possible\ndepending on what the GROed skbs look like; from corrupted packets to\nkernel crashes.\n\nOne example is a BUG_ON[1] triggered in skb_segment while processing the\nfrag_list. Because gso_size is wrong (geneve header was pulled)\nskb_segment thinks there is \"geneve header size\" of data in frag_list,\nalthough it\u0027s in fact the next packet. The BUG_ON itself has nothing to\ndo with the issue. This is only one of the potential issues.\n\nLooking up for a matching socket in udp_gro_receive is fragile: the\nlookup could be extended to all netns (not speaking about performances)\nbut nothing prevents those packets from being modified in between and we\ncould still not find a matching socket. It\u0027s OK to keep the current\nlogic there as it should cover most cases but we also need to make sure\nwe handle tunnel packets being GROed too early.\n\nThis is done by extending the checks in udp_unexpected_gso: GSO packets\nlacking the SKB_GSO_UDP_TUNNEL/_CSUM bits and landing in a tunnel must\nbe segmented.\n\n[1] kernel BUG at net/core/skbuff.c:4408!\n    RIP: 0010:skb_segment+0xd2a/0xf70\n    __udp_gso_segment+0xaa/0x560"
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            "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: udp: no acepte skbs GSO que no sean de t\u00fanel que aterricen en un t\u00fanel Cuando rx-udp-gro-forwarding est\u00e1 habilitado, los paquetes UDP pueden recibir GRO al reenviarse. Si dichos paquetes pudieran aterrizar en un t\u00fanel, esto puede causar varios problemas y udp_gro_receive se asegura de que este no sea el caso buscando un socket coincidente. Esto se realiza en udp4/6_gro_lookup_skb pero s\u00f3lo en las redes actuales. Este es un problema con los paquetes tunelizados cuando el punto final est\u00e1 en otra red. En tales casos, los paquetes se almacenar\u00e1n en el nivel UDP, lo que generar\u00e1 varios problemas m\u00e1s adelante. Lo mismo puede pasar con rx-gro-list. Vimos esto con paquetes geneve siendo GRO en el nivel UDP. En tal caso, se establece gso_size; luego, el paquete pasa por la ruta geneve rx, se extrae el encabezado geneve, se ajusta el desplazamiento y los skbs frag_list no se ajustan con respecto a geneve. Cuando esos skbs lleguen a skb_fragment, se comportar\u00e1 mal. Son posibles diferentes resultados dependiendo del aspecto de los skbs GROed; desde paquetes corruptos hasta fallas del kernel. Un ejemplo es un BUG_ON[1] activado en skb_segment mientras se procesa frag_list. Debido a que gso_size es incorrecto (se extrajo el encabezado geneve), skb_segment cree que hay un \"tama\u00f1o de encabezado geneve\" de datos en frag_list, aunque en realidad es el siguiente paquete. El BUG_ON en s\u00ed no tiene nada que ver con el problema. \u00c9ste es s\u00f3lo uno de los posibles problemas. Buscar un socket coincidente en udp_gro_receive es fr\u00e1gil: la b\u00fasqueda podr\u00eda extenderse a todas las redes (sin hablar de rendimiento), pero nada impide que esos paquetes se modifiquen en el medio y todav\u00eda no pudimos encontrar un socket coincidente. Est\u00e1 bien mantener la l\u00f3gica actual all\u00ed, ya que deber\u00eda cubrir la mayor\u00eda de los casos, pero tambi\u00e9n debemos asegurarnos de manejar los paquetes de t\u00fanel que se procesan en GRO demasiado pronto. Esto se hace ampliando las comprobaciones en udp_unexpected_gso: los paquetes OSG que carecen de los bits SKB_GSO_UDP_TUNNEL/_CSUM y que aterrizan en un t\u00fanel deben segmentarse. [1] \u00a1BUG del kernel en net/core/skbuff.c:4408! RIP: 0010:skb_segment+0xd2a/0xf70 __udp_gso_segment+0xaa/0x560"
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                {
                  "lessThanOrEqual": "6.6.*",
                  "status": "unaffected",
                  "version": "6.6.26",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "6.8.*",
                  "status": "unaffected",
                  "version": "6.8.5",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "*",
                  "status": "unaffected",
                  "version": "6.9",
                  "versionType": "original_commit_for_fix"
                }
              ]
            }
          ],
          "cpeApplicability": [
            {
              "nodes": [
                {
                  "cpeMatch": [
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "5.10.215",
                      "versionStartIncluding": "5.6",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "5.15.154",
                      "versionStartIncluding": "5.6",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "6.1.85",
                      "versionStartIncluding": "5.6",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "6.6.26",
                      "versionStartIncluding": "5.6",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "6.8.5",
                      "versionStartIncluding": "5.6",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "6.9",
                      "versionStartIncluding": "5.6",
                      "vulnerable": true
                    }
                  ],
                  "negate": false,
                  "operator": "OR"
                }
              ]
            }
          ],
          "descriptions": [
            {
              "lang": "en",
              "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nudp: do not accept non-tunnel GSO skbs landing in a tunnel\n\nWhen rx-udp-gro-forwarding is enabled UDP packets might be GROed when\nbeing forwarded. If such packets might land in a tunnel this can cause\nvarious issues and udp_gro_receive makes sure this isn\u0027t the case by\nlooking for a matching socket. This is performed in\nudp4/6_gro_lookup_skb but only in the current netns. This is an issue\nwith tunneled packets when the endpoint is in another netns. In such\ncases the packets will be GROed at the UDP level, which leads to various\nissues later on. The same thing can happen with rx-gro-list.\n\nWe saw this with geneve packets being GROed at the UDP level. In such\ncase gso_size is set; later the packet goes through the geneve rx path,\nthe geneve header is pulled, the offset are adjusted and frag_list skbs\nare not adjusted with regard to geneve. When those skbs hit\nskb_fragment, it will misbehave. Different outcomes are possible\ndepending on what the GROed skbs look like; from corrupted packets to\nkernel crashes.\n\nOne example is a BUG_ON[1] triggered in skb_segment while processing the\nfrag_list. Because gso_size is wrong (geneve header was pulled)\nskb_segment thinks there is \"geneve header size\" of data in frag_list,\nalthough it\u0027s in fact the next packet. The BUG_ON itself has nothing to\ndo with the issue. This is only one of the potential issues.\n\nLooking up for a matching socket in udp_gro_receive is fragile: the\nlookup could be extended to all netns (not speaking about performances)\nbut nothing prevents those packets from being modified in between and we\ncould still not find a matching socket. It\u0027s OK to keep the current\nlogic there as it should cover most cases but we also need to make sure\nwe handle tunnel packets being GROed too early.\n\nThis is done by extending the checks in udp_unexpected_gso: GSO packets\nlacking the SKB_GSO_UDP_TUNNEL/_CSUM bits and landing in a tunnel must\nbe segmented.\n\n[1] kernel BUG at net/core/skbuff.c:4408!\n    RIP: 0010:skb_segment+0xd2a/0xf70\n    __udp_gso_segment+0xaa/0x560"
            }
          ],
          "metrics": [
            {
              "cvssV3_1": {
                "baseScore": 9.8,
                "baseSeverity": "CRITICAL",
                "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
                "version": "3.1"
              },
              "scenarios": [
                {
                  "lang": "en",
                  "value": "AV:N - The bug is triggered entirely by UDP datagrams received from the network on the GRO/forwarding path (`udp4/6_gro_receive` \u2192 `udp_queue_rcv_skb` \u2192 geneve/vxlan `encap_rcv`), with no local access required. Any remote host able to send UDP to the tunnel port (geneve 6081, vxlan 4789) of a forwarding router reaches the vulnerable code.\nAC:L - The attacker fully controls the 4-tuple, packet sizes and burst rate needed to force GRO coalescing and to produce the length mismatch after the geneve header is pulled; there is no race or unknowable memory state involved. The enabling condition is either a documented ethtool setting deployed in overlay/container networking, or can be created outright by any unprivileged `UDP_GRO` socket, which requires no capability.\nPR:N - UDP tunnel protocols (geneve/vxlan/bareudp) perform no authentication, and `udp_gro_receive` runs before any socket-level filtering \u2014 the vulnerable path is entered with `sk == NULL` by design. No credentials of any kind are needed.\nUI:N - Packets are processed automatically in softirq/NAPI context on receipt; no action by any local user or administrator is required at attack time.\nS:U - Although the aggregation happens in one netns and the damage manifests in another, network namespaces share a single kernel security authority. This is a standard in-kernel memory/packet-handling defect with no hypervisor or IOMMU boundary crossed.\nC:H - With a stale `gso_size` and unadjusted `frag_list` skbs, `skb_segment()` builds segments from wrong offsets and sets `nskb-\u003edata_len = len - hsize` overstating the real payload, so bytes belonging to adjacent packets (and skb/page memory beyond the intended content) are emitted onto the wire. In a multi-tenant overlay this leaks one flow\u0027s decapsulated data into another\u0027s stream.\nI:H - The commit explicitly states outcomes range \"from corrupted packets to kernel crashes\" \u2014 the offset/length confusion lets attacker-influenced bytes be spliced into another packet\u0027s decapsulated payload, corrupting forwarded traffic. The same inconsistent skb length accounting is the classic primitive for skb-layer out-of-bounds writes.\nA:H - The reported outcome is `kernel BUG at net/core/skbuff.c:4408` in `skb_segment()` reached from `__udp_gso_segment()`, i.e. a BUG()/oops taken in softirq context leading to kernel panic. A remote unauthenticated attacker can retrigger it at will by resending crafted UDP bursts."
                }
              ]
            }
          ],
          "providerMetadata": {
            "dateUpdated": "2026-08-05T11:30:40.216Z",
            "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "shortName": "Linux"
          },
          "references": [
            {
              "url": "https://git.kernel.org/stable/c/3391b157780bbedf8ef9f202cbf10ee90bf6b0f8"
            },
            {
              "url": "https://git.kernel.org/stable/c/d49ae15a5767d4e9ef8bbb79e42df1bfebc94670"
            },
            {
              "url": "https://git.kernel.org/stable/c/d12245080cb259d82b34699f6cd4ec11bdb688bd"
            },
            {
              "url": "https://git.kernel.org/stable/c/3001e7aa43d6691db2a878b0745b854bf12ddd19"
            },
            {
              "url": "https://git.kernel.org/stable/c/35fe0e0b5c00bef7dde74842a2564c43856fbce4"
            },
            {
              "url": "https://git.kernel.org/stable/c/3d010c8031e39f5fa1e8b13ada77e0321091011f"
            }
          ],
          "title": "udp: do not accept non-tunnel GSO skbs landing in a tunnel",
          "x_generator": {
            "engine": "bippy-1.2.0"
          }
        }
      },
      "cveMetadata": {
        "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "assignerShortName": "Linux",
        "cveId": "CVE-2024-35884",
        "datePublished": "2024-05-19T08:34:40.948Z",
        "dateReserved": "2024-05-17T13:50:33.112Z",
        "dateUpdated": "2026-08-05T11:30:40.216Z",
        "state": "PUBLISHED"
      },
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

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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.


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.