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Review reviewCritical

CVE-2025-39975

Linux

In the Linux kernel, the following vulnerability has been resolved: smb: client: fix wrong index reference in smb2_compound_op() In smb2_compound_op(), the loop that processes each command's response uses wrong indices when accessing response bufferes. This incorrect indexing leads to improper handling of command results. Also, if incorrectly computed index is greather than or equal to MAX_COMPOUND, it can cause out-of-bounds accesses.

CVSS
9.8
EPSS
0.43%
35.5% percentile
CISA KEV
Not listed
Published
2025.10.15
PRIORITY ASSESSMENT

Review review

The CVSS severity warrants an early asset and exposure review.

Known exploitationNot established by KEV
Exploit probability0.43%
Technical severityCVSS 9.8

Vulnerability overview

In the Linux kernel, the following vulnerability has been resolved: smb: client: fix wrong index reference in smb2_compound_op() In smb2_compound_op(), the loop that processes each command's response uses wrong indices when accessing response bufferes. This incorrect indexing leads to improper handling of command results. Also, if incorrectly computed index is greather than or equal to MAX_COMPOUND, it can cause out-of-bounds accesses.

Affected product and versions

Product
Linux
Affected versions
>= 5ddcc9e92d54548219985ce4de88618fb53e14ec < ba7bcfd52c66dd1c2dfa5142aca7e4a70b62dfa5, >= efe8db3ecaa40a8520dc9a54283dcecd82ceea9c < bfb1e2aad1fecef8320fd71332acde0d53a8d699, >= 3681c74d342db75b0d641ba60de27bf73e16e66b < 093615fc76063ea08d454ba86677ce64c736e806, >= 3681c74d342db75b0d641ba60de27bf73e16e66b < fbe2dc6a9c7318f7263f5e4d50f6272b931c5756, >= 77aefd1d9b790f60634adebbdcfffbe934f41c34, >= 6.6.75 < 6.6.109, >= 6.12.12 < 6.12.50, >= 6.13.1 < 6.14, >= 6.14
Fixed versions
No verified fixed-version field is available yet

Recommended response sequence

Confirm exposure before applying a vendor-supported change.

Full remediation guide
  1. 1
    Identify

    Confirm that Linux 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:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CWE
Not available