CVE-2025-68725 (GCVE-0-2025-68725)

Vulnerability from cvelistv5 – Published: 2025-12-24 10:33 – Updated: 2026-10-15 01:10
VLAI
Title
bpf: Do not let BPF test infra emit invalid GSO types to stack
Summary
In the Linux kernel, the following vulnerability has been resolved: bpf: Do not let BPF test infra emit invalid GSO types to stack Yinhao et al. reported that their fuzzer tool was able to trigger a skb_warn_bad_offload() from netif_skb_features() -> gso_features_check(). When a BPF program - triggered via BPF test infra - pushes the packet to the loopback device via bpf_clone_redirect() then mentioned offload warning can be seen. GSO-related features are then rightfully disabled. We get into this situation due to convert___skb_to_skb() setting gso_segs and gso_size but not gso_type. Technically, it makes sense that this warning triggers since the GSO properties are malformed due to the gso_type. Potentially, the gso_type could be marked non-trustworthy through setting it at least to SKB_GSO_DODGY without any other specific assumptions, but that also feels wrong given we should not go further into the GSO engine in the first place. The checks were added in 121d57af308d ("gso: validate gso_type in GSO handlers") because there were malicious (syzbot) senders that combine a protocol with a non-matching gso_type. If we would want to drop such packets, gso_features_check() currently only returns feature flags via netif_skb_features(), so one location for potentially dropping such skbs could be validate_xmit_unreadable_skb(), but then otoh it would be an additional check in the fast-path for a very corner case. Given bpf_clone_redirect() is the only place where BPF test infra could emit such packets, lets reject them right there.
Severity
No CVSS data available.
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-06-10 20:40 UTC
Assigner
Linux CNA under the mitre root
CNA scorecard D 53/100 over 7033 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 850a88cc4096fe1df407452ba2e4d28cf5b3eee9 , < bb7902ed7d7f6d6a7c6c4dc25410d6127ce1085f (git)
Affected: 850a88cc4096fe1df407452ba2e4d28cf5b3eee9 , < e0ffb64a2d72c6705b4a4c9efef600409f7e98a0 (git)
Affected: 850a88cc4096fe1df407452ba2e4d28cf5b3eee9 , < 768376ece7036ecb8604961793a1b72afe6345dd (git)
Affected: 850a88cc4096fe1df407452ba2e4d28cf5b3eee9 , < 8670b53b8ee91f028f7240531064020b7413c461 (git)
Affected: 850a88cc4096fe1df407452ba2e4d28cf5b3eee9 , < 0f3a60869ca22024dfb9c6fce412b0c70cb4ea36 (git)
Affected: 850a88cc4096fe1df407452ba2e4d28cf5b3eee9 , < fbea4c63b5385588cb44ab21f91e55e33c719a54 (git)
Affected: 850a88cc4096fe1df407452ba2e4d28cf5b3eee9 , < 04a899573fb87273a656f178b5f920c505f68875 (git)
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Linux Linux Affected: 5.6
Unaffected: 0 , < 5.6 (semver)
Unaffected: 5.10.249 , ≤ 5.10.* (semver)
Unaffected: 5.15.199 , ≤ 5.15.* (semver)
Unaffected: 6.1.162 , ≤ 6.1.* (semver)
Unaffected: 6.6.122 , ≤ 6.6.* (semver)
Unaffected: 6.12.68 , ≤ 6.12.* (semver)
Unaffected: 6.18.2 , ≤ 6.18.* (semver)
Unaffected: 6.19 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP Affected: V3.1.6 , < * (custom)
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Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP Affected: V3.1.7 , < * (custom)
guessed Create a notification for this product.
Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP Affected: V3.1.6 , < * (custom)
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Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP Affected: V3.1.7 , < * (custom)
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Siemens SIPLUS S7-1500 CPU 1518-4 PN/DP MFP Affected: V3.1.6 , < * (custom)
guessed Create a notification for this product.
Siemens SIPLUS S7-1500 CPU 1518-4 PN/DP MFP Affected: V3.1.7 , < * (custom)
guessed Create a notification for this product.
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            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: Do not let BPF test infra emit invalid GSO types to stack\n\nYinhao et al. reported that their fuzzer tool was able to trigger a\nskb_warn_bad_offload() from netif_skb_features() -\u003e gso_features_check().\nWhen a BPF program - triggered via BPF test infra - pushes the packet\nto the loopback device via bpf_clone_redirect() then mentioned offload\nwarning can be seen. GSO-related features are then rightfully disabled.\n\nWe get into this situation due to convert___skb_to_skb() setting\ngso_segs and gso_size but not gso_type. Technically, it makes sense\nthat this warning triggers since the GSO properties are malformed due\nto the gso_type. Potentially, the gso_type could be marked non-trustworthy\nthrough setting it at least to SKB_GSO_DODGY without any other specific\nassumptions, but that also feels wrong given we should not go further\ninto the GSO engine in the first place.\n\nThe checks were added in 121d57af308d (\"gso: validate gso_type in GSO\nhandlers\") because there were malicious (syzbot) senders that combine\na protocol with a non-matching gso_type. If we would want to drop such\npackets, gso_features_check() currently only returns feature flags via\nnetif_skb_features(), so one location for potentially dropping such skbs\ncould be validate_xmit_unreadable_skb(), but then otoh it would be\nan additional check in the fast-path for a very corner case. Given\nbpf_clone_redirect() is the only place where BPF test infra could emit\nsuch packets, lets reject them right there."
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            "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nbpf: No permitir que la infraestructura de prueba de BPF emita tipos GSO inv\u00e1lidos a la pila\n\nYinhao et al. informaron que su herramienta de fuzzer fue capaz de activar un skb_warn_bad_offload() desde netif_skb_features()  -\u003e  gso_features_check(). Cuando un programa BPF - activado a trav\u00e9s de la infraestructura de prueba de BPF - empuja el paquete al dispositivo de bucle invertido a trav\u00e9s de bpf_clone_redirect(), entonces la advertencia de descarga mencionada puede ser vista. Las caracter\u00edsticas relacionadas con GSO son entonces justamente deshabilitadas.\n\nEntramos en esta situaci\u00f3n debido a que convert___skb_to_skb() establece gso_segs y gso_size pero no gso_type. T\u00e9cnicamente, tiene sentido que esta advertencia se active ya que las propiedades GSO est\u00e1n malformadas debido al gso_type. Potencialmente, el gso_type podr\u00eda ser marcado como no confiable al establecerlo al menos en SKB_GSO_DODGY sin ninguna otra suposici\u00f3n espec\u00edfica, pero eso tambi\u00e9n parece incorrecto dado que no deber\u00edamos ir m\u00e1s all\u00e1 en el motor GSO en primer lugar.\n\nLas comprobaciones se a\u00f1adieron en 121d57af308d (\u0027gso: validate gso_type in GSO handlers\u0027) porque hab\u00eda remitentes maliciosos (syzbot) que combinaban un protocolo con un gso_type no coincidente. Si quisi\u00e9ramos descartar tales paquetes, gso_features_check() actualmente solo devuelve banderas de caracter\u00edsticas a trav\u00e9s de netif_skb_features(), por lo que una ubicaci\u00f3n para potencialmente descartar tales skbs podr\u00eda ser validate_xmit_unreadable_skb(), pero por otro lado ser\u00eda una comprobaci\u00f3n adicional en la ruta r\u00e1pida para un caso muy particular. Dado que bpf_clone_redirect() es el \u00fanico lugar donde la infraestructura de prueba de BPF podr\u00eda emitir tales paquetes, rechac\u00e9moslos justo ah\u00ed."
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              "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: Do not let BPF test infra emit invalid GSO types to stack\n\nYinhao et al. reported that their fuzzer tool was able to trigger a\nskb_warn_bad_offload() from netif_skb_features() -\u003e gso_features_check().\nWhen a BPF program - triggered via BPF test infra - pushes the packet\nto the loopback device via bpf_clone_redirect() then mentioned offload\nwarning can be seen. GSO-related features are then rightfully disabled.\n\nWe get into this situation due to convert___skb_to_skb() setting\ngso_segs and gso_size but not gso_type. Technically, it makes sense\nthat this warning triggers since the GSO properties are malformed due\nto the gso_type. Potentially, the gso_type could be marked non-trustworthy\nthrough setting it at least to SKB_GSO_DODGY without any other specific\nassumptions, but that also feels wrong given we should not go further\ninto the GSO engine in the first place.\n\nThe checks were added in 121d57af308d (\"gso: validate gso_type in GSO\nhandlers\") because there were malicious (syzbot) senders that combine\na protocol with a non-matching gso_type. If we would want to drop such\npackets, gso_features_check() currently only returns feature flags via\nnetif_skb_features(), so one location for potentially dropping such skbs\ncould be validate_xmit_unreadable_skb(), but then otoh it would be\nan additional check in the fast-path for a very corner case. Given\nbpf_clone_redirect() is the only place where BPF test infra could emit\nsuch packets, lets reject them right there."
            }
          ],
          "providerMetadata": {
            "dateUpdated": "2026-05-11T21:52:08.120Z",
            "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "shortName": "Linux"
          },
          "references": [
            {
              "url": "https://git.kernel.org/stable/c/bb7902ed7d7f6d6a7c6c4dc25410d6127ce1085f"
            },
            {
              "url": "https://git.kernel.org/stable/c/e0ffb64a2d72c6705b4a4c9efef600409f7e98a0"
            },
            {
              "url": "https://git.kernel.org/stable/c/768376ece7036ecb8604961793a1b72afe6345dd"
            },
            {
              "url": "https://git.kernel.org/stable/c/8670b53b8ee91f028f7240531064020b7413c461"
            },
            {
              "url": "https://git.kernel.org/stable/c/0f3a60869ca22024dfb9c6fce412b0c70cb4ea36"
            },
            {
              "url": "https://git.kernel.org/stable/c/fbea4c63b5385588cb44ab21f91e55e33c719a54"
            },
            {
              "url": "https://git.kernel.org/stable/c/04a899573fb87273a656f178b5f920c505f68875"
            }
          ],
          "title": "bpf: Do not let BPF test infra emit invalid GSO types to stack",
          "x_generator": {
            "engine": "bippy-1.2.0"
          }
        }
      },
      "cveMetadata": {
        "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "assignerShortName": "Linux",
        "cveId": "CVE-2025-68725",
        "datePublished": "2025-12-24T10:33:09.610Z",
        "dateReserved": "2025-12-24T10:30:51.027Z",
        "dateUpdated": "2026-09-08T08:43:20.254Z",
        "state": "PUBLISHED"
      },
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



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