CVE-2024-46847

Kernel crash via uninitialized vmap_block CPU index

Published Sep 27, 2024 · Updated Aug 5, 2026

Out-of-bounds access in Linux kernel 6.6.37 through 6.6.50 and 6.9.8 through 6.10.9 allows local users to crash the kernel. new_vmap_block publishes a partially initialized vmap_block in the per-CPU xarray before assigning vb->cpu, so concurrent vm_unmap_aliases processing can use an uninitialized value as a remote-queue index. The public record documents UBSAN failures on Android but does not establish controlled data access or code execution.

CVSS severity7.8
High
EPSS probability0.23%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Out-of-bounds access in Linux kernel 6.6.37 through 6.6.50 and 6.9.8 through 6.10.9 allows local users to crash the kernel. new_vmap_block publishes a partially initialized vmap_block in the per-CPU xarray before assigning vb->cpu, so concurrent vm_unmap_aliases processing can use an uninitialized value as a remote-queue index. The public record documents UBSAN failures on Android but does not establish controlled data access or code execution.

The record

CVE
CVE-2024-46847
Published
Sep 27, 2024
Updated
Aug 5, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-129, T1499.004
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

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=6.10
  2. Affected versionversion=6.6.37 <6.6.51
  3. Affected versionversion=6.9.8 <6.10
  4. Affected versionversion=88e0ad40d08a73a74c597e69f4cd2d1fba3838b5 <1b2770e27d6d952f491bb362b657e5b2713c3efd
  5. Affected versionversion=8c61291fd8500e3b35c7ec0c781b273d8cc96cde <3e3de7947c751509027d26b679ecd243bc9db255
  6. Affected versionversion=8c61291fd8500e3b35c7ec0c781b273d8cc96cde <6cf74e0e5e3ab5d5c9defb4c73dad54d52224671
  7. Affected versionversion=9983b81579be3403f5cc44b11f66c6c8bea6547f

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=6.10; version=6.6.37 <6.6.51; version=6.9.8 <6.10; version=88e0ad40d08a73a74c597e69f4cd2d1fba3838b5 <1b2770e27d6d952f491bb362b657e5b2713c3efd; version=8c61291fd8500e3b35c7ec0c781b273d8cc96cde <3e3de7947c751509027d26b679ecd243bc9db255; version=8c61291fd8500e3b35c7ec0c781b273d8cc96cde <6cf74e0e5e3ab5d5c9defb4c73dad54d52224671; version=9983b81579be3403f5cc44b11f66c6c8bea6547f

Published CVSS scores

5.5NISTCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
7.8kernel.orgCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/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-129Improper Validation of Array Index
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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