CVE-2026-98752Public exploit

Kernel crash via unsynchronized TTY hangup

Published Oct 18, 2026 · Updated Oct 18, 2026

A race in Linux TTY port hangup allows attackers to crash the kernel through concurrent hangup and device teardown operations. Missing serialization in tty_port_tty_vhangup() and tty_port_hangup() lets teardown proceed before shutdown completes, leaving racing ioctls or asynchronous hangups accessing freed resources or NULL pointers. Triggering requires an affected TTY driver and overlapping hangup and deregistration activity, such as device disconnect; privilege escalation is not established.

CVSS severityUnavailable
Unscored
EPSS probability0.17%
Next 30 days · Oct 19, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

A race in Linux TTY port hangup allows attackers to crash the kernel through concurrent hangup and device teardown operations. Missing serialization in tty_port_tty_vhangup() and tty_port_hangup() lets teardown proceed before shutdown completes, leaving racing ioctls or asynchronous hangups accessing freed resources or NULL pointers. Triggering requires an affected TTY driver and overlapping hangup and deregistration activity, such as device disconnect; privilege escalation is not established.

The record

CVE
CVE-2026-98752
Published
Oct 18, 2026
Updated
Oct 18, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499
Attack vector
local
Privileges
Unavailable

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=2.6.31.2 <2.6.32
  2. Affected versionversion=2.6.32
  3. Affected versionversion=4260dc792fabfd20c8644fa9414b2ae48372365f
  4. Affected versionversion=7ca0ff9ab3218ec443a7a9ad247e4650373ed41e <017b18addbe8dcace1a569a00d40ed1ba1e03f4c
  5. Affected versionversion=7ca0ff9ab3218ec443a7a9ad247e4650373ed41e <6b7be3b9b857947e9c1338d4919d4ebd3b75e907
  6. Affected versionversion=7ca0ff9ab3218ec443a7a9ad247e4650373ed41e <6d1a984afc3ca477dab3e51ec806671d443ad524
  7. Affected versionversion=7ca0ff9ab3218ec443a7a9ad247e4650373ed41e <b48820de8c1a596c5b99775524dfce73c6576c5d

What conditions does exploitation require?

Attack vectorlocal
Required privilegesUnavailable in this record.

What is affected?

The Linux Kernel Organization · Linuxversion=2.6.31.2 <2.6.32; version=2.6.32; version=4260dc792fabfd20c8644fa9414b2ae48372365f; version=7ca0ff9ab3218ec443a7a9ad247e4650373ed41e <017b18addbe8dcace1a569a00d40ed1ba1e03f4c; version=7ca0ff9ab3218ec443a7a9ad247e4650373ed41e <6b7be3b9b857947e9c1338d4919d4ebd3b75e907; version=7ca0ff9ab3218ec443a7a9ad247e4650373ed41e <6d1a984afc3ca477dab3e51ec806671d443ad524; version=7ca0ff9ab3218ec443a7a9ad247e4650373ed41e <b48820de8c1a596c5b99775524dfce73c6576c5d

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.

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 exploitPublished

Weakness, pattern, technique

T1499Endpoint Denial of Service

Public exploit references

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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