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Review reviewHigh

CVE-2025-40124

Linux

In the Linux kernel, the following vulnerability has been resolved: sparc: fix accurate exception reporting in copy_{from_to}_user for UltraSPARC III Anthony Yznaga tracked down that a BUG_ON in ext4 code with large folios enabled resulted from copy_from_user() returning impossibly large values greater than the size to be copied. This lead to __copy_from_iter() returning impossible values instead of the actual number of bytes it was able to copy. The BUG_ON has been reported in https://lore.kernel.org/r/b14f55642207e63e907965e209f6323a0df6dcee.camel@physik.fu-berlin.de The referenced commit...

CVSS
7.8
EPSS
0.15%
4.79% percentile
CISA KEV
Not listed
Published
2025.11.12
PRIORITY ASSESSMENT

Review review

The CVSS severity warrants an early asset and exposure review.

Known exploitationNot established by KEV
Exploit probability0.15%
Technical severityCVSS 7.8

Vulnerability overview

In the Linux kernel, the following vulnerability has been resolved: sparc: fix accurate exception reporting in copy_{from_to}_user for UltraSPARC III Anthony Yznaga tracked down that a BUG_ON in ext4 code with large folios enabled resulted from copy_from_user() returning impossibly large values greater than the size to be copied. This lead to __copy_from_iter() returning impossible values instead of the actual number of bytes it was able to copy. The BUG_ON has been reported in https://lore.kernel.org/r/b14f55642207e63e907965e209f6323a0df6dcee.camel@physik.fu-berlin.de The referenced commit...

Affected product and versions

Product
Linux
Affected versions
>= ee841d0aff649164080e445e84885015958d8ff4 < fdd43fe6d286f27b826572457a89c926f97e2d3a, >= ee841d0aff649164080e445e84885015958d8ff4 < 1198077606aeffb102587c6ea079ce99641c99d4, >= ee841d0aff649164080e445e84885015958d8ff4 < 1857cdca12c4aff58bf26a7005a4d02850c29927, >= ee841d0aff649164080e445e84885015958d8ff4 < 91eda032eb16e5d2be27c95584665bc555bb5a90, >= ee841d0aff649164080e445e84885015958d8ff4 < dc766c4830a7e1e1ee9d7f77d4ab344f2eb23c8e, >= ee841d0aff649164080e445e84885015958d8ff4 < 5ef9c94d7110e90260c06868cf1dcf899b9f25ee, >= ee841d0aff649164080e445e84885015958d8ff4 < e50377c6b3f278c9f3ef017ffce17f5fcc9dace4, >= ee841d0aff649164080e445e84885015958d8ff4 < 47b49c06eb62504075f0f2e2227aee2e2c2a58b3, >= 1c7e17b1c4d60cc5aa575460f7efb73686dd3b39, >= ac663c54f40b2830b1ca32d1ae9d683fe248b14c, >= 4.4.34 < 4.5, >= 4.8.10 < 4.9, >= 4.9
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:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CWE
Not available
CVE-2025-40124 — Linux | SECUFOCUS NOW