CVE-2026-43163

Local kernel crash via unlocked bitmap resize

Published May 6, 2026 · Updated May 6, 2026

A use-after-free in the Linux Kernel md bitmap subsystem allows local users to crash the kernel during array resize operations. bitmap_daemon_work iterates over bitmap->storage.filemap without locking while __bitmap_resize frees that storage through md_bitmap_file_unmap. Exploitation requires low-privileged local access and concurrent resize activity; a successful race dereferences freed pages and produces a General Protection Fault.

CVSS severity4.7
Medium
EPSS probability0.09%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

A use-after-free in the Linux Kernel md bitmap subsystem allows local users to crash the kernel during array resize operations. bitmap_daemon_work iterates over bitmap->storage.filemap without locking while __bitmap_resize frees that storage through md_bitmap_file_unmap. Exploitation requires low-privileged local access and concurrent resize activity; a successful race dereferences freed pages and produces a General Protection Fault.

The record

CVE
CVE-2026-43163
Published
May 6, 2026
Updated
May 6, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
CWE-362, T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. May 6, 2026CVE publishedPublication date reported by the CVE source.
  2. May 6, 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=3.5
  2. Affected versionversion=d60b479d177a5735b6b4db6ee5280ef6653f50e7 <140cc839fbeb1ddb33a8da8811b716d88d3905b7
  3. Affected versionversion=d60b479d177a5735b6b4db6ee5280ef6653f50e7 <46ef85f854dfa9d5226b3c1c46493d79556c9589
  4. Affected versionversion=d60b479d177a5735b6b4db6ee5280ef6653f50e7 <5f73c8b33df9a605a591eab72d43a969600c1f8c
  5. Affected versionversion=d60b479d177a5735b6b4db6ee5280ef6653f50e7 <9a6f8cd28bb9bb6ed86a6df19331fb08016dee7f
  6. Affected versionversion=d60b479d177a5735b6b4db6ee5280ef6653f50e7 <a437e3bf30e32846079e470c1ba5ee790bccdf89
  7. Affected versionversion=d60b479d177a5735b6b4db6ee5280ef6653f50e7 <d3af62411e19752c663fe4f424dbf49d95a4cc7c
  8. Affected versionversion=d60b479d177a5735b6b4db6ee5280ef6653f50e7 <d92b8fac294b5f915c50e65ce4ae2262e53614ec
  9. Affected versionversion=d60b479d177a5735b6b4db6ee5280ef6653f50e7 <ebcacc7ca22d5e8a03a970f0621ae1d1356b9ae8

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=3.5; version=d60b479d177a5735b6b4db6ee5280ef6653f50e7 <140cc839fbeb1ddb33a8da8811b716d88d3905b7; version=d60b479d177a5735b6b4db6ee5280ef6653f50e7 <46ef85f854dfa9d5226b3c1c46493d79556c9589; version=d60b479d177a5735b6b4db6ee5280ef6653f50e7 <5f73c8b33df9a605a591eab72d43a969600c1f8c; version=d60b479d177a5735b6b4db6ee5280ef6653f50e7 <9a6f8cd28bb9bb6ed86a6df19331fb08016dee7f; version=d60b479d177a5735b6b4db6ee5280ef6653f50e7 <a437e3bf30e32846079e470c1ba5ee790bccdf89; version=d60b479d177a5735b6b4db6ee5280ef6653f50e7 <d3af62411e19752c663fe4f424dbf49d95a4cc7c; version=d60b479d177a5735b6b4db6ee5280ef6653f50e7 <d92b8fac294b5f915c50e65ce4ae2262e53614ec; version=d60b479d177a5735b6b4db6ee5280ef6653f50e7 <ebcacc7ca22d5e8a03a970f0621ae1d1356b9ae8

Published CVSS scores

4.7NIST NVDCVSS:3.1/AV:L/AC:H/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-362Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')
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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