CVE-2026-80977Hinoki check available

Local page-cache writes via shared zerocopy state

Published Sep 11, 2026 · Updated Sep 11, 2026

Improper shared-state handling in the Linux kernel allows local users to write page-cache data through crafted zerocopy traffic. skb_tx_error() clears shared zerocopy flags in skb_shinfo() for a cloned buffer, causing later ESP decryption to overwrite pages still shared with the page cache. Exploitation requires an Open vSwitch path with a non-last recirculation action, a clone flow miss, and local ESP delivery.

CVSS severityUnavailable
Unscored
EPSS probability0.13%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

Improper shared-state handling in the Linux kernel allows local users to write page-cache data through crafted zerocopy traffic. skb_tx_error() clears shared zerocopy flags in skb_shinfo() for a cloned buffer, causing later ESP decryption to overwrite pages still shared with the page cache. Exploitation requires an Open vSwitch path with a non-last recirculation action, a clone flow miss, and local ESP delivery.

The record

CVE
CVE-2026-80977
Published
Sep 11, 2026
Updated
Sep 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1565.001
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Sep 11, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 11, 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?

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  1. Affected versionversion=25121173f7b1e4ac3fc692df6e7b8c52ec36abba <0370da114a9bc044e248b85c6809d1b5e0c1f7f9
  2. Affected versionversion=25121173f7b1e4ac3fc692df6e7b8c52ec36abba <15aa81b390d401abf4b8211042470e9e92e3b7fb
  3. Affected versionversion=25121173f7b1e4ac3fc692df6e7b8c52ec36abba <288f9970670841044ab030104fa6b6ed159949d0
  4. Affected versionversion=25121173f7b1e4ac3fc692df6e7b8c52ec36abba <f66bdb1cc0fcd227a062378f8be0b5873aa5600a
  5. Affected versionversion=3.8

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=25121173f7b1e4ac3fc692df6e7b8c52ec36abba <0370da114a9bc044e248b85c6809d1b5e0c1f7f9; version=25121173f7b1e4ac3fc692df6e7b8c52ec36abba <15aa81b390d401abf4b8211042470e9e92e3b7fb; version=25121173f7b1e4ac3fc692df6e7b8c52ec36abba <288f9970670841044ab030104fa6b6ed159949d0; version=25121173f7b1e4ac3fc692df6e7b8c52ec36abba <f66bdb1cc0fcd227a062378f8be0b5873aa5600a; version=3.8

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

T1565.001Stored Data Manipulation

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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