CVE-2024-46844

Kernel-memory disclosure or panic via uninitialized pointer

Published Sep 27, 2024 · Updated Aug 5, 2026

Uninitialized pointer access in affected Linux User-Mode Linux kernels allows local users to disclose kernel memory or panic the guest kernel. arch/um/drivers/line.c leaves error_out unset when setup_one_line() handles an already-invalid line, after which callers pass a null or stale pointer to strlen() or printk(). An ordinary local account able to write to the unauthenticated mconsole UNIX socket can trigger the deterministic crash; boot-time paths can instead expose kernel memory through the guest log.

CVSS severity7.1
High
EPSS probability0.26%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Uninitialized pointer access in affected Linux User-Mode Linux kernels allows local users to disclose kernel memory or panic the guest kernel. arch/um/drivers/line.c leaves error_out unset when setup_one_line() handles an already-invalid line, after which callers pass a null or stale pointer to strlen() or printk(). An ordinary local account able to write to the unauthenticated mconsole UNIX socket can trigger the deterministic crash; boot-time paths can instead expose kernel memory through the guest log.

The record

CVE
CVE-2024-46844
Published
Sep 27, 2024
Updated
Aug 5, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-824, T1499, T1005
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Sep 27, 2024CVE publishedPublication date reported by the CVE source.
  2. Aug 5, 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=31efcebb7d7196adcee73027f513d7c0bf572b47 <289979d64573f43df1d0e6bc6435de63a0d69cdf
  2. Affected versionversion=31efcebb7d7196adcee73027f513d7c0bf572b47 <3bedb7ce080690d0d6172db790790c1219bcbdd5
  3. Affected versionversion=31efcebb7d7196adcee73027f513d7c0bf572b47 <43f782c27907f306c664b6614fd6f264ac32cce6
  4. Affected versionversion=31efcebb7d7196adcee73027f513d7c0bf572b47 <824ac4a5edd3f7494ab1996826c4f47f8ef0f63d
  5. Affected versionversion=31efcebb7d7196adcee73027f513d7c0bf572b47 <96301fdc2d533a196197c055af875fe33d47ef84
  6. Affected versionversion=31efcebb7d7196adcee73027f513d7c0bf572b47 <c8944d449fda9f58c03bd99649b2df09948fc874
  7. Affected versionversion=31efcebb7d7196adcee73027f513d7c0bf572b47 <ec5b47a370177d79ae7773858042c107e21f8ecc
  8. Affected versionversion=31efcebb7d7196adcee73027f513d7c0bf572b47 <fc843d3837ebcb1c16d3768ef3eb55e25d5331f2
  9. Affected versionversion=3.4

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=31efcebb7d7196adcee73027f513d7c0bf572b47 <289979d64573f43df1d0e6bc6435de63a0d69cdf; version=31efcebb7d7196adcee73027f513d7c0bf572b47 <3bedb7ce080690d0d6172db790790c1219bcbdd5; version=31efcebb7d7196adcee73027f513d7c0bf572b47 <43f782c27907f306c664b6614fd6f264ac32cce6; version=31efcebb7d7196adcee73027f513d7c0bf572b47 <824ac4a5edd3f7494ab1996826c4f47f8ef0f63d; version=31efcebb7d7196adcee73027f513d7c0bf572b47 <96301fdc2d533a196197c055af875fe33d47ef84; version=31efcebb7d7196adcee73027f513d7c0bf572b47 <c8944d449fda9f58c03bd99649b2df09948fc874; version=31efcebb7d7196adcee73027f513d7c0bf572b47 <ec5b47a370177d79ae7773858042c107e21f8ecc; version=31efcebb7d7196adcee73027f513d7c0bf572b47 <fc843d3837ebcb1c16d3768ef3eb55e25d5331f2; version=3.4

Published CVSS scores

7.8NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
7.1kernel.orgCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/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.

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No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-824Access of Uninitialized Pointer
T1499Endpoint Denial of Service
T1005Data from Local System

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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