CVE-2026-98581

Memory exhaustion via LLCP socket-list race

Published Oct 18, 2026 · Updated Oct 18, 2026

Race condition in Linux NFC LLCP allows local users to exhaust kernel memory through peer-supplied disconnect messages. In nfc_llcp_recv_dm(), DM(NOBOUND)/DM(REJ) closes connecting sockets without locking or unlinking them, causing release to modify their list under the wrong lock and leak socket references. Exploitation requires unprivileged local LLCP sockets, concurrent connection activity, and an established NFC LLCP peer; the documented consequence is memory-exhaustion denial of service, without a specified crash or reboot.

CVSS severityUnavailable
Unscored
EPSS probability0.21%
Next 30 days · Oct 19, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Race condition in Linux NFC LLCP allows local users to exhaust kernel memory through peer-supplied disconnect messages. In nfc_llcp_recv_dm(), DM(NOBOUND)/DM(REJ) closes connecting sockets without locking or unlinking them, causing release to modify their list under the wrong lock and leak socket references. Exploitation requires unprivileged local LLCP sockets, concurrent connection activity, and an established NFC LLCP peer; the documented consequence is memory-exhaustion denial of service, without a specified crash or reboot.

The record

CVE
CVE-2026-98581
Published
Oct 18, 2026
Updated
Oct 18, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499.001
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Oct 18, 2026CVE publishedPublication date reported by the CVE source.
  2. Oct 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=3.6
  2. Affected versionversion=a69f32af86e389dd232b1bb2269e202c1bfcc60f <320a2ff49bdce3f9a437b9a9ff341ff27d3bdbf1
  3. Affected versionversion=a69f32af86e389dd232b1bb2269e202c1bfcc60f <7fb2c0eeb79bfad64065f539a453138abd0edda6
  4. Affected versionversion=a69f32af86e389dd232b1bb2269e202c1bfcc60f <812731dd8511f5768f4ff279b3c18d85cd21da4b
  5. Affected versionversion=a69f32af86e389dd232b1bb2269e202c1bfcc60f <b94cf09720543cc34256c7aa88f8059cbe7c0419
  6. Affected versionversion=a69f32af86e389dd232b1bb2269e202c1bfcc60f <bf1460acdf8cf5a07c819f59785d40f20d113099
  7. Affected versionversion=a69f32af86e389dd232b1bb2269e202c1bfcc60f <c1e9ed52a6697354366dddf190fbacee8ed2f7c5
  8. Affected versionversion=a69f32af86e389dd232b1bb2269e202c1bfcc60f <dba1d9c7134afcb4b1bfad8c1b1b3f0ab5189b08
  9. Affected versionversion=a69f32af86e389dd232b1bb2269e202c1bfcc60f <dd2d24add86b3b63cd87cf2feff98ae119ba19a6

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=3.6; version=a69f32af86e389dd232b1bb2269e202c1bfcc60f <320a2ff49bdce3f9a437b9a9ff341ff27d3bdbf1; version=a69f32af86e389dd232b1bb2269e202c1bfcc60f <7fb2c0eeb79bfad64065f539a453138abd0edda6; version=a69f32af86e389dd232b1bb2269e202c1bfcc60f <812731dd8511f5768f4ff279b3c18d85cd21da4b; version=a69f32af86e389dd232b1bb2269e202c1bfcc60f <b94cf09720543cc34256c7aa88f8059cbe7c0419; version=a69f32af86e389dd232b1bb2269e202c1bfcc60f <bf1460acdf8cf5a07c819f59785d40f20d113099; version=a69f32af86e389dd232b1bb2269e202c1bfcc60f <c1e9ed52a6697354366dddf190fbacee8ed2f7c5; version=a69f32af86e389dd232b1bb2269e202c1bfcc60f <dba1d9c7134afcb4b1bfad8c1b1b3f0ab5189b08; version=a69f32af86e389dd232b1bb2269e202c1bfcc60f <dd2d24add86b3b63cd87cf2feff98ae119ba19a6

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.

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

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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

T1499.001OS Exhaustion Flood

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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