CVE-2026-46257

Local system crash via uninitialized SP804 timer

Published Jun 3, 2026 · Updated Jun 3, 2026

Use of an uninitialized resource in Linux Kernel 6.19 through 6.19.3 allows local users to crash ARM32 systems using SP804 timers. sp804_register_delay_timer registers a delay timer even when sched_clkevt was not initialized because SP804 was not selected as sched_clock, so read_current_timer dereferences sched_clkevt->value. The path requires an ARM32 platform with an SP804 timer configured without SP804 as sched_clock; triggering it produces a kernel Oops and interrupts the system.

CVSS severity5.5
Medium
EPSS probability0.10%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Use of an uninitialized resource in Linux Kernel 6.19 through 6.19.3 allows local users to crash ARM32 systems using SP804 timers. sp804_register_delay_timer registers a delay timer even when sched_clkevt was not initialized because SP804 was not selected as sched_clock, so read_current_timer dereferences sched_clkevt->value. The path requires an ARM32 platform with an SP804 timer configured without SP804 as sched_clock; triggering it produces a kernel Oops and interrupts the system.

The record

CVE
CVE-2026-46257
Published
Jun 3, 2026
Updated
Jun 3, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
CWE-908, T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Jun 3, 2026CVE publishedPublication date reported by the CVE source.
  2. Jun 3, 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=6.19
  2. Affected versionversion=640594a04f119338019b0aeed70c7301216595b3 <693b0b594b0f278bafa784984129c0c0f988e352
  3. Affected versionversion=640594a04f119338019b0aeed70c7301216595b3 <694921a93f3e3621e067afc545cedf6fe3b234a9

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=6.19; version=640594a04f119338019b0aeed70c7301216595b3 <693b0b594b0f278bafa784984129c0c0f988e352; version=640594a04f119338019b0aeed70c7301216595b3 <694921a93f3e3621e067afc545cedf6fe3b234a9

Published CVSS scores

5.5NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-908Use of Uninitialized Resource
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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