CVE-2025-68183Public exploit

IMA signature replacement via unrelated xattr changes

Published Dec 16, 2025 · Updated Dec 16, 2025

Integrity-state corruption in Linux IMA allows local users to replace stored file signatures with hashes through unrelated xattr or ACL changes. ima_reset_appraise_flags treats non-IMA attribute updates as a request to clear IMA_DIGSIG, so file close invokes ima_update_xattr and overwrites the signature. Both IMA and EVM must run in fix mode, and the user must be able to change the relevant file attributes; the resulting hash no longer preserves the signed reference.

CVSS severity7.8
High
EPSS probability0.15%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Integrity-state corruption in Linux IMA allows local users to replace stored file signatures with hashes through unrelated xattr or ACL changes. ima_reset_appraise_flags treats non-IMA attribute updates as a request to clear IMA_DIGSIG, so file close invokes ima_update_xattr and overwrites the signature. Both IMA and EVM must run in fix mode, and the user must be able to change the relevant file attributes; the resulting hash no longer preserves the signed reference.

The record

CVE
CVE-2025-68183
Published
Dec 16, 2025
Updated
Dec 16, 2025
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
Unavailable
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Dec 16, 2025CVE publishedPublication date reported by the CVE source.
  2. Dec 16, 2025Record 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 <02aa671c08a4834bef5166743a7b88686fbfa023
  2. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <88b4cbcf6b041ae0f2fc8a34554a5b6a83a2b7cd
  3. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <d2993a7e98eb70c737c6f5365a190e79c72b8407
  4. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <edd824eb45e4f7e05ad3ab090dab6dbdb79cd292

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <02aa671c08a4834bef5166743a7b88686fbfa023; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <88b4cbcf6b041ae0f2fc8a34554a5b6a83a2b7cd; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <d2993a7e98eb70c737c6f5365a190e79c72b8407; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <edd824eb45e4f7e05ad3ab090dab6dbdb79cd292

Published CVSS scores

7.1OracleCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H
7.8UbuntuCVSS: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

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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 exploitPublished

Weakness, pattern, technique

No sourced classifications are available.

Public exploit references

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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