CVE-2026-98273

Kernel crash via miscalculated CS CALL return address

Published Oct 6, 2026 · Updated Oct 6, 2026

Kernel crash in Linux x86 kprobes allows local users with probe permissions to interrupt the system by targeting a CS-prefixed CALL. During INT3-based kprobe emulation, int3_emulate_call() assumes a five-byte CALL and pushes a return address inside the actual six-byte instruction. The fault requires a probe at an affected instruction and causes a kernel page fault rather than data disclosure or code execution.

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

Kernel crash in Linux x86 kprobes allows local users with probe permissions to interrupt the system by targeting a CS-prefixed CALL. During INT3-based kprobe emulation, int3_emulate_call() assumes a five-byte CALL and pushes a return address inside the actual six-byte instruction. The fault requires a probe at an affected instruction and causes a kernel page fault rather than data disclosure or code execution.

The record

CVE
CVE-2026-98273
Published
Oct 6, 2026
Updated
Oct 6, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499.004
Attack vector
local
Privileges
Unavailable

Timeline

How it unfolded

  1. Oct 6, 2026CVE publishedPublication date reported by the CVE source.
  2. Oct 6, 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=5.10.190 <5.11
  2. Affected versionversion=5.13
  3. Affected versionversion=6256e668b7af9d81472e03c6a171630c08f8858a <a5f7a5bb3b7f28ba7e4fa246775b29a0e5537255
  4. Affected versionversion=6256e668b7af9d81472e03c6a171630c08f8858a <cfc1af3d054aaabee08f1f77c441b3533b082869
  5. Affected versionversion=6256e668b7af9d81472e03c6a171630c08f8858a <d8c6a18c0552135cbf0c696c9019b2979d0862c9
  6. Affected versionversion=ba7d1dae9fe866abe74bb1e849fb85983b7c4c37

What conditions does exploitation require?

Attack vectorlocal
Required privilegesUnavailable in this record.

What is affected?

The Linux Kernel Organization · Linuxversion=5.10.190 <5.11; version=5.13; version=6256e668b7af9d81472e03c6a171630c08f8858a <a5f7a5bb3b7f28ba7e4fa246775b29a0e5537255; version=6256e668b7af9d81472e03c6a171630c08f8858a <cfc1af3d054aaabee08f1f77c441b3533b082869; version=6256e668b7af9d81472e03c6a171630c08f8858a <d8c6a18c0552135cbf0c696c9019b2979d0862c9; version=ba7d1dae9fe866abe74bb1e849fb85983b7c4c37

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 exploitUnconfirmed

Weakness, pattern, technique

T1499.004Endpoint Denial of Service: Application or System Exploitation

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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