CVE-2026-43120

Kernel memory corruption via stale umem pointer

Published May 6, 2026 · Updated May 6, 2026

Double free in the Linux Kernel RDMA/irdma subsystem allows local users to corrupt kernel memory through memory-region re-registration. After a replacement umem is released on an irdma_rereg_mr_trans error, iwmr->region retains the stale pointer and deregistration releases it again. Exploitation requires a low-privileged local user, the translation-change path, and a failure after allocation; no more specific operational consequence is published.

CVSS severity7.8
High
EPSS probability0.12%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Double free in the Linux Kernel RDMA/irdma subsystem allows local users to corrupt kernel memory through memory-region re-registration. After a replacement umem is released on an irdma_rereg_mr_trans error, iwmr->region retains the stale pointer and deregistration releases it again. Exploitation requires a low-privileged local user, the translation-change path, and a failure after allocation; no more specific operational consequence is published.

The record

CVE
CVE-2026-43120
Published
May 6, 2026
Updated
May 6, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
CWE-415
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=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <0c5d70bcb9d2275a1c8515a924016fcfeb4ab441
  2. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <0f22c32141acdcda266b26cab2b830baf870f3e0
  3. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <29a3edd7004bb635d299fb9bc6f0ea4ef13ed5a2
  4. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <62298a48f8b8788ad8b8464e6ffdf1ddebd2217e
  5. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <66964118f1f50ed85001c8fc9f7ab5bbdd021ee0

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <0c5d70bcb9d2275a1c8515a924016fcfeb4ab441; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <0f22c32141acdcda266b26cab2b830baf870f3e0; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <29a3edd7004bb635d299fb9bc6f0ea4ef13ed5a2; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <62298a48f8b8788ad8b8464e6ffdf1ddebd2217e; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <66964118f1f50ed85001c8fc9f7ab5bbdd021ee0

Published CVSS scores

7.8kernel.orgCVSS:3.1/AV:L/AC:L/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
7.8NIST NVDCVSS: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.

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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

CWE-415Double Free

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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