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

Vulnerability from cvelistv5 – Published: 2025-12-24 10:33 – Updated: 2026-07-14 12:44
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
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)
guessed Create a notification for this product.
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)
guessed Create a notification for this product.
Siemens SIMATIC S7-1500 CPU 1518F-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: V3.1.6 , < * (custom)
guessed Create a notification for this product.
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    "redhat_vex": {
      "aggregate_severity": "Low",
      "current_release_date": "2026-06-30T10:40:00+00:00",
      "cve": "CVE-2025-68725",
      "id": "CVE-2025-68725",
      "initial_release_date": "2025-12-24T00:00:00+00:00",
      "product_status:known_affected": "246",
      "product_status:known_not_affected": "28",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: bpf: Do not let BPF test infra emit invalid GSO types to stack",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2025/cve-2025-68725.json",
      "version": "3"
    },
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      "aggregate_severity": "moderate",
      "current_release_date": "2026-07-25T00:25:09Z",
      "cve": "CVE-2025-68725",
      "id": "CVE-2025-68725",
      "initial_release_date": "2025-12-25T00:23:55Z",
      "product_status:first_fixed": "2",
      "product_status:known_affected": "648",
      "product_status:known_not_affected": "113",
      "product_status:recommended": "313",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2025-68725",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2025-68725.json",
      "version": "29"
    },
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\"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\"}], \"x_generator\": {\"engine\": \"bippy-1.2.0\"}, \"descriptions\": [{\"lang\": \"en\", \"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.\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.10.249\", \"versionStartIncluding\": \"5.6\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.15.199\", \"versionStartIncluding\": \"5.6\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.1.162\", \"versionStartIncluding\": \"5.6\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.6.122\", \"versionStartIncluding\": \"5.6\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.12.68\", \"versionStartIncluding\": \"5.6\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.18.2\", \"versionStartIncluding\": \"5.6\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.19\", \"versionStartIncluding\": \"5.6\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2026-05-11T21:52:08.120Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2025-68725\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-07-14T12:44:07.762Z\", \"dateReserved\": \"2025-12-24T10:30:51.027Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2025-12-24T10:33:09.610Z\", \"assignerShortName\": \"Linux\"}",
      "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

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.