CVE-2026-90063 (GCVE-0-2026-90063)

Vulnerability from cvelistv5 – Published: 2026-09-17 16:05 – Updated: 2026-10-19 08:57
VLAI
Title
virtio-net: Ensure that TCP packets don't overflow gso_segs
Summary
In the Linux kernel, the following vulnerability has been resolved: virtio-net: Ensure that TCP packets don't overflow gso_segs The user can specify any gso_size in a packet crafted with an AF_PACKET PACKET_VNET_HDR socket, even smaller than TCP_MIN_GSO_SIZE = 8. At the same time, GSO_MAX_SIZE = 8 * GSO_MAX_SEGS = 8 * 65535. When the user crafts a packet with gso_size < 8, there is a risk for partial GSO to overflow the 16-bit gso_segs field when dividing the SKB length by gso_size. Adjust gso_size of TCP packets to be at least TCP_MIN_GSO_SIZE = 8. Keep gso_size of UDP GSO packets, as gso_size=1 is valid and explicitly tested at tools/testing/selftests/net/tun.c:649.
Severity
No CVSS data available.
Assigner
Linux CNA under the mitre root
CNA scorecard D 53/100 over 7064 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 7c6d2ecbda83150b2036a2b36b21381ad4667762 , < d3d111fe809773edbb4ae121e36253b7d683509a (git)
Affected: 7c6d2ecbda83150b2036a2b36b21381ad4667762 , < 8f6667a081887c2b59c6f3dd86c1789ada563762 (git)
Affected: 7c6d2ecbda83150b2036a2b36b21381ad4667762 , < 339f47ae04dcc6b5a730dd6bc70dddc8937c3260 (git)
Affected: 7c6d2ecbda83150b2036a2b36b21381ad4667762 , < 29bd12c7c5f9d6cf855b87bace18f71e9607f9e8 (git)
Affected: 7c6d2ecbda83150b2036a2b36b21381ad4667762 , < 0e5ed3b98d1d8d251acfdccfeaa607453ad12954 (git)
Affected: 7c6d2ecbda83150b2036a2b36b21381ad4667762 , < 75c271c48f483af678e514734e10b2452410e08c (git)
Affected: 7c6d2ecbda83150b2036a2b36b21381ad4667762 , < c27c449d455aafd9018a3cbab150f1c42c87923f (git)
Affected: bfbaf151efe491e30697e21c8b7ae1b615480873 (git)
Affected: 6c83456601e65a6dd371ddf595510183d198e9b1 (git)
Affected: b3ebd9830c6026c98f03f7047c9d608573773f13 (git)
Affected: b96fb681ca789629b8ba3da99ca3b2e6fa807f0a (git)
Affected: 4.14.187 , < 4.15 (semver)
Affected: 4.19.131 , < 4.20 (semver)
Affected: 5.4.46 , < 5.5 (semver)
Affected: 5.6.18 , < 5.7 (semver)
guessed Create a notification for this product.
Linux Linux Affected: 5.7
Unaffected: 0 , < 5.7 (semver)
Unaffected: 5.15.221 , ≤ 5.15.* (semver)
Unaffected: 6.1.188 , ≤ 6.1.* (semver)
Unaffected: 6.6.157 , ≤ 6.6.* (semver)
Unaffected: 6.12.110 , ≤ 6.12.* (semver)
Unaffected: 6.18.52 , ≤ 6.18.* (semver)
Unaffected: 7.2.6 , ≤ 7.2.* (semver)
Unaffected: 7.3 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
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            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nvirtio-net: Ensure that TCP packets don\u0027t overflow gso_segs\n\nThe user can specify any gso_size in a packet crafted with an AF_PACKET\nPACKET_VNET_HDR socket, even smaller than TCP_MIN_GSO_SIZE = 8. At the\nsame time, GSO_MAX_SIZE = 8 * GSO_MAX_SEGS = 8 * 65535. When the user\ncrafts a packet with gso_size \u003c 8, there is a risk for partial GSO to\noverflow the 16-bit gso_segs field when dividing the SKB length by\ngso_size.\n\nAdjust gso_size of TCP packets to be at least TCP_MIN_GSO_SIZE = 8. Keep\ngso_size of UDP GSO packets, as gso_size=1 is valid and explicitly\ntested at tools/testing/selftests/net/tun.c:649."
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        "vulnStatus": "Received"
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      "product_status:known_not_affected": "277",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: virtio-net: Ensure that TCP packets don\u0027t overflow gso_segs",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-90063.json",
      "version": "3"
    },
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      "current_release_date": "2026-10-20T00:49:13Z",
      "cve": "CVE-2026-90063",
      "id": "CVE-2026-90063",
      "initial_release_date": "2026-09-18T00:22:06Z",
      "product_status:known_affected": "213",
      "product_status:known_not_affected": "135",
      "product_status:recommended": "4",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-90063",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/2026/cve-2026-90063.json",
      "version": "6"
    }
  }
}



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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.
Vulnerability timeline

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    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.