CVE-2026-80590Hinoki check available

Local kernel panic via retained fragment GSO state

Published Aug 28, 2026 · Updated Aug 28, 2026

Improper packet handling in Linux allows local users to panic the kernel via GSO-marked IP fragments submitted through tap. Fragment reassembly preserves attacker-supplied gso_size, gso_type, and gso_segs metadata, so skb_segment treats the resulting frag_list as GRO-shaped input and hits a BUG_ON. Exploitation requires tun/tap access, CAP_NET_RAW in a suitable network namespace, or a guest whose VMM forwards virtio_net_hdr; the result is a host kernel panic.

CVSS severityUnavailable
Unscored
EPSS probability0.59%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

Improper packet handling in Linux allows local users to panic the kernel via GSO-marked IP fragments submitted through tap. Fragment reassembly preserves attacker-supplied gso_size, gso_type, and gso_segs metadata, so skb_segment treats the resulting frag_list as GRO-shaped input and hits a BUG_ON. Exploitation requires tun/tap access, CAP_NET_RAW in a suitable network namespace, or a guest whose VMM forwards virtio_net_hdr; the result is a host kernel panic.

The record

CVE
CVE-2026-80590
Published
Aug 28, 2026
Updated
Aug 28, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 28, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 28, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

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

  1. Affected versionversion=2.6.27
  2. Affected versionversion=f43798c27684ab925adde7d8acc34c78c6e50df8 <14a8f3e10fa9a5abd6cedcdaa0c0b7ea9a09f234
  3. Affected versionversion=f43798c27684ab925adde7d8acc34c78c6e50df8 <29dda278a5ed272f2230ff4eaa23cf403107bba0
  4. Affected versionversion=f43798c27684ab925adde7d8acc34c78c6e50df8 <3edf721bb4b99d272c336631b44e3d8ff9a4f31b
  5. Affected versionversion=f43798c27684ab925adde7d8acc34c78c6e50df8 <69b73b74d9eb45f5560a8fe4fa406ada580e1340
  6. Affected versionversion=f43798c27684ab925adde7d8acc34c78c6e50df8 <c49f04e8d2b94dbb8d9fd99731dd3f00589c8ace
  7. Affected versionversion=f43798c27684ab925adde7d8acc34c78c6e50df8 <cfdbc8c2e6f9ef5d8b8e54859da03dfe682b0bee
  8. Affected versionversion=f43798c27684ab925adde7d8acc34c78c6e50df8 <da857e448322a2e871ce3ecc2900027041160d43
  9. Affected versionversion=f43798c27684ab925adde7d8acc34c78c6e50df8 <dec2edb7aaf12a8878b3a03172ea8fc277b8eaad

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=2.6.27; version=f43798c27684ab925adde7d8acc34c78c6e50df8 <14a8f3e10fa9a5abd6cedcdaa0c0b7ea9a09f234; version=f43798c27684ab925adde7d8acc34c78c6e50df8 <29dda278a5ed272f2230ff4eaa23cf403107bba0; version=f43798c27684ab925adde7d8acc34c78c6e50df8 <3edf721bb4b99d272c336631b44e3d8ff9a4f31b; version=f43798c27684ab925adde7d8acc34c78c6e50df8 <69b73b74d9eb45f5560a8fe4fa406ada580e1340; version=f43798c27684ab925adde7d8acc34c78c6e50df8 <c49f04e8d2b94dbb8d9fd99731dd3f00589c8ace; version=f43798c27684ab925adde7d8acc34c78c6e50df8 <cfdbc8c2e6f9ef5d8b8e54859da03dfe682b0bee; version=f43798c27684ab925adde7d8acc34c78c6e50df8 <da857e448322a2e871ce3ecc2900027041160d43; version=f43798c27684ab925adde7d8acc34c78c6e50df8 <dec2edb7aaf12a8878b3a03172ea8fc277b8eaad

Published CVSS scores

No CVSS assessment is available in this record.

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.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1499.004Application or System Exploitation

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

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Your stack

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