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Review reviewHigh

CVE-2025-22039

Linux Linux, linux kernel

In the Linux kernel, the following vulnerability has been resolved: ksmbd: fix overflow in dacloffset bounds check The dacloffset field was originally typed as int and used in an unchecked addition, which could overflow and bypass the existing bounds check in both smb_check_perm_dacl() and smb_inherit_dacl(). This could result in out-of-bounds memory access and a kernel crash when dereferencing the DACL pointer. This patch converts dacloffset to unsigned int and uses check_add_overflow() to validate access to the DACL.

CVSS
7.1
EPSS
0.66%
48.2% percentile
CISA KEV
Not listed
Published
2025.04.17
PRIORITY ASSESSMENT

Review review

The CVSS severity warrants an early asset and exposure review.

Known exploitationNot established by KEV
Exploit probability0.66%
Technical severityCVSS 7.1

Vulnerability overview

In the Linux kernel, the following vulnerability has been resolved: ksmbd: fix overflow in dacloffset bounds check The dacloffset field was originally typed as int and used in an unchecked addition, which could overflow and bypass the existing bounds check in both smb_check_perm_dacl() and smb_inherit_dacl(). This could result in out-of-bounds memory access and a kernel crash when dereferencing the DACL pointer. This patch converts dacloffset to unsigned int and uses check_add_overflow() to validate access to the DACL.

Affected product and versions

Product
Linux Linux, linux kernel
Affected versions
>= 0626e6641f6b467447c81dd7678a69c66f7746cf < 6a9cd9ff0fa2bcc30b2bfb8bdb161eb20e44b9dc, >= 0626e6641f6b467447c81dd7678a69c66f7746cf < 6b8d379048b168a0dff5ab1acb975b933f368514, >= 0626e6641f6b467447c81dd7678a69c66f7746cf < 443b373a4df5a2cb9f7b8c4658b2afedeb16397f, >= 0626e6641f6b467447c81dd7678a69c66f7746cf < beff0bc9d69bc8e733f9bca28e2d3df5b3e10e42, >= 5.15, >= 5.15 < 6.12.23, >= 6.13 < 6.13.11, >= 6.14 < 6.14.2
Fixed versions
6.12.23, 6.13.11, 6.14.2

Recommended response sequence

Confirm exposure before applying a vendor-supported change.

Full remediation guide
  1. 1
    Identify

    Confirm that Linux Linux, linux kernel and an affected version are present.

  2. 2
    Prioritize

    Combine exploitation signals with asset exposure and business criticality.

  3. 3
    Remediate

    Follow the vendor advisory or supported update path and preserve rollback options.

  4. 4
    Verify

    Recheck the version, service health, access paths, and relevant logs.

Technical data

CVSS vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H
CWE
CWE-125, CWE-190