CVE-2026-23107

Local kernel crash via missing SSVE allocation

Published Feb 4, 2026 · Updated Feb 4, 2026

NULL pointer dereference in affected arm64 Linux Kernel branches allows local users to crash the kernel via a restored ZA context. restore_za_context() sets TIF_SME without first allocating sve_state, so later register-state storage dereferences a NULL pointer. Triggering requires an uncommon ZA signal context not created by the same task, such as a checkpoint restored by CRIU; the reported consequence is a kernel oops and service interruption.

CVSS severity5.5
Medium
EPSS probability0.13%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

NULL pointer dereference in affected arm64 Linux Kernel branches allows local users to crash the kernel via a restored ZA context. restore_za_context() sets TIF_SME without first allocating sve_state, so later register-state storage dereferences a NULL pointer. Triggering requires an uncommon ZA signal context not created by the same task, such as a checkpoint restored by CRIU; the reported consequence is a kernel oops and service interruption.

The record

CVE
CVE-2026-23107
Published
Feb 4, 2026
Updated
Feb 4, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
CWE-476, T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Feb 4, 2026CVE publishedPublication date reported by the CVE source.
  2. Feb 4, 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=39782210eb7e87634d96cacb6ece370bc59d74ba <0af233d66eff90fb8f3e0fc09f2316bba0b72bb9
  2. Affected versionversion=39782210eb7e87634d96cacb6ece370bc59d74ba <19b2c3f3ca1b4b6dccd2a42aca2692d8c79c4214
  3. Affected versionversion=39782210eb7e87634d96cacb6ece370bc59d74ba <70f7f54566afc23f2c71bf1411af81f5d8009e0f
  4. Affected versionversion=39782210eb7e87634d96cacb6ece370bc59d74ba <ea8ccfddbce0bee6310da4f3fc560ad520f5e6b4
  5. Affected versionversion=5.19

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=39782210eb7e87634d96cacb6ece370bc59d74ba <0af233d66eff90fb8f3e0fc09f2316bba0b72bb9; version=39782210eb7e87634d96cacb6ece370bc59d74ba <19b2c3f3ca1b4b6dccd2a42aca2692d8c79c4214; version=39782210eb7e87634d96cacb6ece370bc59d74ba <70f7f54566afc23f2c71bf1411af81f5d8009e0f; version=39782210eb7e87634d96cacb6ece370bc59d74ba <ea8ccfddbce0bee6310da4f3fc560ad520f5e6b4; version=5.19

Published CVSS scores

5.5NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
5.5Canonical Ubuntu SecurityCVSS: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

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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-476NULL Pointer Dereference
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

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Your stack

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