CVE-2026-90143Hinoki check available

Kernel warning or panic via unlocked BPF parser

Published Sep 17, 2026 · Updated Sep 18, 2026

Missing RCU locking in the Linux KCM strparser allows local users to trigger a kernel warning through BPF map operations. kcm_parse_func_strparser() pins execution to a CPU but runs the BPF program without entering an RCU read-side critical section, so map operations fail the bpf_rcu_lock_held() assertion. Triggering requires a KCM strparser BPF program that performs map operations; systems configured with panic_on_warn crash instead of only logging the warning.

CVSS severity7.8
High
EPSS probability0.16%
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

Missing RCU locking in the Linux KCM strparser allows local users to trigger a kernel warning through BPF map operations. kcm_parse_func_strparser() pins execution to a CPU but runs the BPF program without entering an RCU read-side critical section, so map operations fail the bpf_rcu_lock_held() assertion. Triggering requires a KCM strparser BPF program that performs map operations; systems configured with panic_on_warn crash instead of only logging the warning.

The record

CVE
CVE-2026-90143
Published
Sep 17, 2026
Updated
Sep 18, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499
Attack vector
local
Privileges
Unavailable

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

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=4.9
  2. Affected versionversion=9b73896a81dc68a638a011877b7344b252f92276 <1d26a6e007d46babc7fa76e5a157dccf86cd55c0
  3. Affected versionversion=9b73896a81dc68a638a011877b7344b252f92276 <21526f8a191a3c50622b8c10bd927870d780eae4
  4. Affected versionversion=9b73896a81dc68a638a011877b7344b252f92276 <292846223eaddba890e40699d2ab82ee5671798c
  5. Affected versionversion=9b73896a81dc68a638a011877b7344b252f92276 <37108861cf7bd909d4a372069bcd61c8f489e232
  6. Affected versionversion=9b73896a81dc68a638a011877b7344b252f92276 <3c70d27e792a28bca650ddd8a9aa0fe3591ffec5
  7. Affected versionversion=9b73896a81dc68a638a011877b7344b252f92276 <b0346dd64e4905291cc9c479f2e6cf1884ced4e6
  8. Affected versionversion=9b73896a81dc68a638a011877b7344b252f92276 <b0e94ea63dbdcbfec9beb819cd5f8fa584809ef2
  9. Affected versionversion=9b73896a81dc68a638a011877b7344b252f92276 <f392affef3c9ce64dfdde794df0579e0a7793440

What conditions does exploitation require?

Attack vectorlocal
Required privilegesUnavailable in this record.

What is affected?

The Linux Kernel Organization · Linuxversion=4.9; version=9b73896a81dc68a638a011877b7344b252f92276 <1d26a6e007d46babc7fa76e5a157dccf86cd55c0; version=9b73896a81dc68a638a011877b7344b252f92276 <21526f8a191a3c50622b8c10bd927870d780eae4; version=9b73896a81dc68a638a011877b7344b252f92276 <292846223eaddba890e40699d2ab82ee5671798c; version=9b73896a81dc68a638a011877b7344b252f92276 <37108861cf7bd909d4a372069bcd61c8f489e232; version=9b73896a81dc68a638a011877b7344b252f92276 <3c70d27e792a28bca650ddd8a9aa0fe3591ffec5; version=9b73896a81dc68a638a011877b7344b252f92276 <b0346dd64e4905291cc9c479f2e6cf1884ced4e6; version=9b73896a81dc68a638a011877b7344b252f92276 <b0e94ea63dbdcbfec9beb819cd5f8fa584809ef2; version=9b73896a81dc68a638a011877b7344b252f92276 <f392affef3c9ce64dfdde794df0579e0a7793440

Published CVSS scores

7.8NIST National Vulnerability DatabaseCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

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

T1499Endpoint Denial of Service

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