CVE-2026-90235Hinoki check available

Service interruption via stale SUNRPC callback invocation

Published Sep 17, 2026 · Updated Sep 18, 2026

Race condition in Linux kernel SUNRPC xprtsock allows local users to interrupt service through concurrent socket teardown. Plain stores and loads of sk_data_ready and sk_write_space let another CPU retain and invoke xs_data_ready() or xs_udp_write_space() after lower-socket callbacks are restored. Triggering requires local low-privileged access and a teardown race involving an AF_LOCAL, UDP, or TCP socket; the documented consequence is limited availability loss.

CVSS severity2.5
Low
EPSS probability0.62%
Next 30 days · Oct 19, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

Race condition in Linux kernel SUNRPC xprtsock allows local users to interrupt service through concurrent socket teardown. Plain stores and loads of sk_data_ready and sk_write_space let another CPU retain and invoke xs_data_ready() or xs_udp_write_space() after lower-socket callbacks are restored. Triggering requires local low-privileged access and a teardown race involving an AF_LOCAL, UDP, or TCP socket; the documented consequence is limited availability loss.

The record

CVE
CVE-2026-90235
Published
Sep 17, 2026
Updated
Sep 18, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Sep 17, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 18, 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=2.6.15
  2. Affected versionversion=a246b0105bbd9a70a698f69baae2042996f2a0e9 <33930840b5f0a79f826e7c69dc6cd78f72a67481
  3. Affected versionversion=a246b0105bbd9a70a698f69baae2042996f2a0e9 <589f761236e05ff9de1bdfd6a5258f113e6457fe
  4. Affected versionversion=a246b0105bbd9a70a698f69baae2042996f2a0e9 <d8f0b83753809761a560c4b33249388548ba6e43
  5. Affected versionversion=a246b0105bbd9a70a698f69baae2042996f2a0e9 <da652cb17f9faeea1fa44b7215e8869a0b10b664
  6. Affected versionversion=a246b0105bbd9a70a698f69baae2042996f2a0e9 <ed80d009b154aa204f541d390884851b3d4f15ae

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=2.6.15; version=a246b0105bbd9a70a698f69baae2042996f2a0e9 <33930840b5f0a79f826e7c69dc6cd78f72a67481; version=a246b0105bbd9a70a698f69baae2042996f2a0e9 <589f761236e05ff9de1bdfd6a5258f113e6457fe; version=a246b0105bbd9a70a698f69baae2042996f2a0e9 <d8f0b83753809761a560c4b33249388548ba6e43; version=a246b0105bbd9a70a698f69baae2042996f2a0e9 <da652cb17f9faeea1fa44b7215e8869a0b10b664; version=a246b0105bbd9a70a698f69baae2042996f2a0e9 <ed80d009b154aa204f541d390884851b3d4f15ae

Published CVSS scores

2.5Amazon LinuxCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:L

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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1499Endpoint Denial of Service

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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