CVE-2026-46053

Kernel memory corruption via duplicate MR cleanup

Published May 27, 2026 · Updated May 27, 2026

Memory corruption in Linux Kernel RDS RDMA mapping allows local users to corrupt kernel memory after a user-space cookie copy error. After get_mr() transfers scatter-gather list and page ownership, the __rds_rdma_map() put_user() failure branch unpins and frees those resources before the final MR-reference cleanup repeats teardown. Exploitation requires low-privileged local access and the specific post-allocation copy failure; no demonstrated consequence beyond kernel memory corruption is published.

CVSS severity7.8
High
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

Memory corruption in Linux Kernel RDS RDMA mapping allows local users to corrupt kernel memory after a user-space cookie copy error. After get_mr() transfers scatter-gather list and page ownership, the __rds_rdma_map() put_user() failure branch unpins and frees those resources before the final MR-reference cleanup repeats teardown. Exploitation requires low-privileged local access and the specific post-allocation copy failure; no demonstrated consequence beyond kernel memory corruption is published.

The record

CVE
CVE-2026-46053
Published
May 27, 2026
Updated
May 27, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
Unavailable
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. May 27, 2026CVE publishedPublication date reported by the CVE source.
  2. May 27, 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=0d4597c8c5abdeeaf50774066c16683f30184dc8 <033370ffb3c9c0264d19f8ba9ef769523266589a
  2. Affected versionversion=0d4597c8c5abdeeaf50774066c16683f30184dc8 <8141a2dc70080eda1aedc0389ed2db2b292af5bd
  3. Affected versionversion=0d4597c8c5abdeeaf50774066c16683f30184dc8 <8fdbb6262a4a3ed44a0830a7793903b54bb27bdc
  4. Affected versionversion=0d4597c8c5abdeeaf50774066c16683f30184dc8 <b3cb8cae530b2727d8245684148bb49425f6765c
  5. Affected versionversion=0d4597c8c5abdeeaf50774066c16683f30184dc8 <d95cea9298be1ba8876e3f156be96d3a492085ca
  6. Affected versionversion=5.6

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=0d4597c8c5abdeeaf50774066c16683f30184dc8 <033370ffb3c9c0264d19f8ba9ef769523266589a; version=0d4597c8c5abdeeaf50774066c16683f30184dc8 <8141a2dc70080eda1aedc0389ed2db2b292af5bd; version=0d4597c8c5abdeeaf50774066c16683f30184dc8 <8fdbb6262a4a3ed44a0830a7793903b54bb27bdc; version=0d4597c8c5abdeeaf50774066c16683f30184dc8 <b3cb8cae530b2727d8245684148bb49425f6765c; version=0d4597c8c5abdeeaf50774066c16683f30184dc8 <d95cea9298be1ba8876e3f156be96d3a492085ca; version=5.6

Published CVSS scores

7.8LinuxCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
7.0Amazon LinuxCVSS:3.1/AV:L/AC:H/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 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

No sourced classifications are available.

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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