CVE-2026-90063Hinoki check available

TCP segment-count corruption via unchecked offload size

Published Sep 17, 2026 · Updated Sep 17, 2026

Integer overflow in Linux virtio header handling allows local users to corrupt TCP segment counts via crafted packet headers. The __virtio_net_hdr_to_skb function accepts TCP gso_size values below eight, allowing partial GSO division of the socket-buffer length to overflow the 16-bit gso_segs field. The disclosed AF_PACKET PACKET_VNET_HDR trigger requires CAP_NET_RAW in the governing user namespace; the upstream disclosure does not specify the downstream failure mode or establish code execution.

CVSS severity5.5
Medium
EPSS probability0.21%
Next 30 days · Oct 19, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Get started

Summary

What happened

Integer overflow in Linux virtio header handling allows local users to corrupt TCP segment counts via crafted packet headers. The __virtio_net_hdr_to_skb function accepts TCP gso_size values below eight, allowing partial GSO division of the socket-buffer length to overflow the 16-bit gso_segs field. The disclosed AF_PACKET PACKET_VNET_HDR trigger requires CAP_NET_RAW in the governing user namespace; the upstream disclosure does not specify the downstream failure mode or establish code execution.

The record

CVE
CVE-2026-90063
Published
Sep 17, 2026
Updated
Sep 17, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
Unavailable
Attack vector
local
Privileges
Unavailable

Timeline

How it unfolded

  1. Sep 17, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 17, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=4.14.187 <4.15
  2. Affected versionversion=4.19.131 <4.20
  3. Affected versionversion=5.4.46 <5.5
  4. Affected versionversion=5.6.18 <5.7
  5. Affected versionversion=5.7
  6. Affected versionversion=6c83456601e65a6dd371ddf595510183d198e9b1
  7. Affected versionversion=7c6d2ecbda83150b2036a2b36b21381ad4667762 <0e5ed3b98d1d8d251acfdccfeaa607453ad12954
  8. Affected versionversion=7c6d2ecbda83150b2036a2b36b21381ad4667762 <29bd12c7c5f9d6cf855b87bace18f71e9607f9e8
  9. Affected versionversion=7c6d2ecbda83150b2036a2b36b21381ad4667762 <339f47ae04dcc6b5a730dd6bc70dddc8937c3260
  10. Affected versionversion=7c6d2ecbda83150b2036a2b36b21381ad4667762 <75c271c48f483af678e514734e10b2452410e08c
  11. Affected versionversion=7c6d2ecbda83150b2036a2b36b21381ad4667762 <8f6667a081887c2b59c6f3dd86c1789ada563762
  12. Affected versionversion=7c6d2ecbda83150b2036a2b36b21381ad4667762 <c27c449d455aafd9018a3cbab150f1c42c87923f
  13. Affected versionversion=7c6d2ecbda83150b2036a2b36b21381ad4667762 <d3d111fe809773edbb4ae121e36253b7d683509a
  14. Affected versionversion=b3ebd9830c6026c98f03f7047c9d608573773f13
  15. Affected versionversion=b96fb681ca789629b8ba3da99ca3b2e6fa807f0a
  16. Affected versionversion=bfbaf151efe491e30697e21c8b7ae1b615480873

What conditions does exploitation require?

Attack vectorlocal
Required privilegesUnavailable in this record.

What is affected?

The Linux Kernel Organization · Linuxversion=4.14.187 <4.15; version=4.19.131 <4.20; version=5.4.46 <5.5; version=5.6.18 <5.7; version=5.7; version=6c83456601e65a6dd371ddf595510183d198e9b1; version=7c6d2ecbda83150b2036a2b36b21381ad4667762 <0e5ed3b98d1d8d251acfdccfeaa607453ad12954; version=7c6d2ecbda83150b2036a2b36b21381ad4667762 <29bd12c7c5f9d6cf855b87bace18f71e9607f9e8; version=7c6d2ecbda83150b2036a2b36b21381ad4667762 <339f47ae04dcc6b5a730dd6bc70dddc8937c3260; version=7c6d2ecbda83150b2036a2b36b21381ad4667762 <75c271c48f483af678e514734e10b2452410e08c; version=7c6d2ecbda83150b2036a2b36b21381ad4667762 <8f6667a081887c2b59c6f3dd86c1789ada563762; version=7c6d2ecbda83150b2036a2b36b21381ad4667762 <c27c449d455aafd9018a3cbab150f1c42c87923f; version=7c6d2ecbda83150b2036a2b36b21381ad4667762 <d3d111fe809773edbb4ae121e36253b7d683509a; version=b3ebd9830c6026c98f03f7047c9d608573773f13; version=b96fb681ca789629b8ba3da99ca3b2e6fa807f0a; version=bfbaf151efe491e30697e21c8b7ae1b615480873

Published CVSS scores

6.5Tenable CVE pageCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
5.5Amazon LinuxCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
8.5Tenable CVE pageAV:N/AC:L/Au:N/C:P/I:N/A:C
7.2Tenable Nessus plugin 347541AV:L/AC:L/Au:N/C:C/I:C/A:C
5.5Tenable Nessus plugin 347541CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
5.1Tenable Nessus plugin 347541CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H/E:U/RL:U/RC:C

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Activity data is delayed. The latest report is Sep 28, 2026.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 22, 2026Sep 28, 2026
Latest reporting daySep 28, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
PrivilegesUnavailable
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

No sourced classifications are available.

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

See the directory against your own environment.

Your stack

Check the software in your environment

Get started to see how Hinoki identifies affected software and validates exploitability in your environment.

Get started