CVE-2026-43132

Kernel crash via invalid error-pointer cleanup

Published May 6, 2026 · Updated May 6, 2026

Denial of service in the Linux Kernel dm-verity FEC path allows local users to crash the kernel when buffer-client allocation fails. In verity_fec_ctr(), either dm_bufio_client_create() call can return an ERR_PTR(), but cleanup passes that value to dm_bufio_client_destroy() without guarding it. The user must be able to configure a dm-verity target with FEC, and the consequence is limited to a system crash.

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

Denial of service in the Linux Kernel dm-verity FEC path allows local users to crash the kernel when buffer-client allocation fails. In verity_fec_ctr(), either dm_bufio_client_create() call can return an ERR_PTR(), but cleanup passes that value to dm_bufio_client_destroy() without guarding it. The user must be able to configure a dm-verity target with FEC, and the consequence is limited to a system crash.

The record

CVE
CVE-2026-43132
Published
May 6, 2026
Updated
May 6, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
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=4.5
  2. Affected versionversion=a739ff3f543afbb4a041c16cd0182c8e8d366e70 <031f2adc1499b112a39ac316bbab3c80bba16cf2
  3. Affected versionversion=a739ff3f543afbb4a041c16cd0182c8e8d366e70 <119f4f04186fa4f33ee6bd39af145cdaff1ff17f
  4. Affected versionversion=a739ff3f543afbb4a041c16cd0182c8e8d366e70 <451cc650e40e8c3222d37877a9e4be0fcaacb9c8
  5. Affected versionversion=a739ff3f543afbb4a041c16cd0182c8e8d366e70 <5c2217ddb3b7e7ac25f4ebe9061258fc8f1c9167
  6. Affected versionversion=a739ff3f543afbb4a041c16cd0182c8e8d366e70 <6283e49af87a9c121bb01e5a64a7fe5706c210bc
  7. Affected versionversion=a739ff3f543afbb4a041c16cd0182c8e8d366e70 <9b8dc1d327e2928f3da59ced0595d850d31c0936
  8. Affected versionversion=a739ff3f543afbb4a041c16cd0182c8e8d366e70 <b154a868a3856fb5216c4f82981d8a503832e095
  9. Affected versionversion=a739ff3f543afbb4a041c16cd0182c8e8d366e70 <d3e1f1adc8a0289efe2d2cdc90edb8c6ffe0b5ef

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=4.5; version=a739ff3f543afbb4a041c16cd0182c8e8d366e70 <031f2adc1499b112a39ac316bbab3c80bba16cf2; version=a739ff3f543afbb4a041c16cd0182c8e8d366e70 <119f4f04186fa4f33ee6bd39af145cdaff1ff17f; version=a739ff3f543afbb4a041c16cd0182c8e8d366e70 <451cc650e40e8c3222d37877a9e4be0fcaacb9c8; version=a739ff3f543afbb4a041c16cd0182c8e8d366e70 <5c2217ddb3b7e7ac25f4ebe9061258fc8f1c9167; version=a739ff3f543afbb4a041c16cd0182c8e8d366e70 <6283e49af87a9c121bb01e5a64a7fe5706c210bc; version=a739ff3f543afbb4a041c16cd0182c8e8d366e70 <9b8dc1d327e2928f3da59ced0595d850d31c0936; version=a739ff3f543afbb4a041c16cd0182c8e8d366e70 <b154a868a3856fb5216c4f82981d8a503832e095; version=a739ff3f543afbb4a041c16cd0182c8e8d366e70 <d3e1f1adc8a0289efe2d2cdc90edb8c6ffe0b5ef

Published CVSS scores

5.5NIST NVDCVSS: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.

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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

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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