CVE-2025-68293

Local system crash via NULL mapping dereference

Published Dec 16, 2025 · Updated Dec 16, 2025

NULL pointer dereference in affected Linux kernel builds allows local users to crash the system while splitting a shmem folio. The mm/huge_memory split logic reads mapping->flags before verifying that the folio mapping is non-NULL for swap-cached or truncated shmem folios. Local low-privileged access is required, and the documented impact is an availability-only system crash without data disclosure or modification.

CVSS severity5.5
Medium
EPSS probability0.21%
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 Linux kernel builds allows local users to crash the system while splitting a shmem folio. The mm/huge_memory split logic reads mapping->flags before verifying that the folio mapping is non-NULL for swap-cached or truncated shmem folios. Local low-privileged access is required, and the documented impact is an availability-only system crash without data disclosure or modification.

The record

CVE
CVE-2025-68293
Published
Dec 16, 2025
Updated
Dec 16, 2025
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Dec 16, 2025CVE publishedPublication date reported by the CVE source.
  2. Dec 16, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=6.9
  2. Affected versionversion=c010d47f107f609b9f4d6a103b6dfc53889049e9 <592db83615a9f0164472ec789c2ed34ad35f732f
  3. Affected versionversion=c010d47f107f609b9f4d6a103b6dfc53889049e9 <cff47b9e39a6abf03dde5f4f156f841b0c54bba0
  4. Affected versionversion=c010d47f107f609b9f4d6a103b6dfc53889049e9 <d1b83fbacd4397a1d2f8c6b13427a8636ae2b307

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=6.9; version=c010d47f107f609b9f4d6a103b6dfc53889049e9 <592db83615a9f0164472ec789c2ed34ad35f732f; version=c010d47f107f609b9f4d6a103b6dfc53889049e9 <cff47b9e39a6abf03dde5f4f156f841b0c54bba0; version=c010d47f107f609b9f4d6a103b6dfc53889049e9 <d1b83fbacd4397a1d2f8c6b13427a8636ae2b307

Published CVSS scores

7.0Amazon LinuxCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
5.5Oracle LinuxCVSS: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

T1499.004Application 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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