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Review reviewHigh

CVE-2025-39723

Linux Linux, linux kernel

In the Linux kernel, the following vulnerability has been resolved: netfs: Fix unbuffered write error handling If all the subrequests in an unbuffered write stream fail, the subrequest collector doesn't update the stream->transferred value and it retains its initial LONG_MAX value. Unfortunately, if all active streams fail, then we take the smallest value of { LONG_MAX, LONG_MAX, ... } as the value to set in wreq->transferred - which is then returned from ->write_iter(). LONG_MAX was chosen as the initial value so that all the streams can be quickly assessed by taking the smallest value of...

CVSS
7.8
EPSS
0.21%
11.6% percentile
CISA KEV
Not listed
Published
2025.09.06
PRIORITY ASSESSMENT

Review review

The CVSS severity warrants an early asset and exposure review.

Known exploitationNot established by KEV
Exploit probability0.21%
Technical severityCVSS 7.8

Vulnerability overview

In the Linux kernel, the following vulnerability has been resolved: netfs: Fix unbuffered write error handling If all the subrequests in an unbuffered write stream fail, the subrequest collector doesn't update the stream->transferred value and it retains its initial LONG_MAX value. Unfortunately, if all active streams fail, then we take the smallest value of { LONG_MAX, LONG_MAX, ... } as the value to set in wreq->transferred - which is then returned from ->write_iter(). LONG_MAX was chosen as the initial value so that all the streams can be quickly assessed by taking the smallest value of...

Affected product and versions

Product
Linux Linux, linux kernel
Affected versions
>= 288ace2f57c9d06dd2e42bd80d03747d879a4068 < f08c80af3c9a9849cd178b4843b7c01d103506a1, >= 288ace2f57c9d06dd2e42bd80d03747d879a4068 < 387164a2b97e1f5404c6d0049a7409bac7d2bc5b, >= 288ace2f57c9d06dd2e42bd80d03747d879a4068 < a3de58b12ce074ec05b8741fa28d62ccb1070468, >= 6.10, >= 6.10 < 6.12.44, >= 6.13 < 6.16.4, 6.17
Fixed versions
6.12.44, 6.16.4

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:H/A:H
CWE
CWE-787