CVE-2026-43362Network attack vector

Remote file corruption via in-place retry encryption

Published May 8, 2026 · Updated May 8, 2026

Data corruption in the Linux kernel SMB client allows remote attackers to corrupt writes through encrypted SMB shares after reconnects. SMB2_write() stores payloads in pointer-shared rq_iov entries, so crypt_message() overwrites plaintext in place and a replayable error resends ciphertext as file data. The victim must use and write to an encrypted SMB share; ordinary synchronous writes are exposed before 6.10, while later kernels expose SFU and Minshall-French special-file operations.

CVSS severity8.1
High
EPSS probability0.22%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Data corruption in the Linux kernel SMB client allows remote attackers to corrupt writes through encrypted SMB shares after reconnects. SMB2_write() stores payloads in pointer-shared rq_iov entries, so crypt_message() overwrites plaintext in place and a replayable error resends ciphertext as file data. The victim must use and write to an encrypted SMB share; ordinary synchronous writes are exposed before 6.10, while later kernels expose SFU and Minshall-French special-file operations.

The record

CVE
CVE-2026-43362
Published
May 8, 2026
Updated
May 8, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
CWE-787, T1485
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. May 8, 2026CVE publishedPublication date reported by the CVE source.
  2. May 8, 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 <438e77435aee2894d5edf90be5c87004a57f6258
  2. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <52327268224fb9ccc7ecfbbdfdfff54b6e93c518
  3. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <92e64f1852f455f57d0850989e57c30d7fac7d95
  4. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <aea5e37388a080361110ab5790f57ae0af383650
  5. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <d78840a6a38d312dc1a51a65317bb67e46f0b929

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <438e77435aee2894d5edf90be5c87004a57f6258; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <52327268224fb9ccc7ecfbbdfdfff54b6e93c518; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <92e64f1852f455f57d0850989e57c30d7fac7d95; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <aea5e37388a080361110ab5790f57ae0af383650; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <d78840a6a38d312dc1a51a65317bb67e46f0b929

Published CVSS scores

8.1LinuxCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/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
8.1UbuntuCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/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)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-787Out-of-bounds Write
T1485Data Destruction

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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