sparc: fix accurate exception reporting in copy_{from_to}_user for UltraSPARC III

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2025-40124
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2025-11-12 11:15:41 UTC
Updated2026-07-30 06:24:12 UTC
DescriptionIn 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 introduced exception handlers on user-space memory references in copy_from_user and copy_to_user. These handlers return from the respective function and calculate the remaining bytes left to copy using the current register contents. The exception handlers expect that %o2 has already been masked during the bulk copy loop, but the masking was performed after that loop. This will fix the return value of copy_from_user and copy_to_user in the faulting case. The behaviour of memcpy stays unchanged.

Risk And Classification

Primary CVSS: v3.1 7.8 HIGH from 416baaa9-dc9f-4396-8d5f-8c081fb06d67

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

EPSS: 0.001510000 probability, percentile 0.048250000 (date 2026-07-31)

VersionSourceTypeScoreSeverityVector
3.1416baaa9-dc9f-4396-8d5f-8c081fb06d67Secondary7.8HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
3.1CNADECLARED7.8HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CVSS v3.1 Breakdown

Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected ee841d0aff649164080e445e84885015958d8ff4 fdd43fe6d286f27b826572457a89c926f97e2d3a git Not specified
CNA Linux Linux affected ee841d0aff649164080e445e84885015958d8ff4 1198077606aeffb102587c6ea079ce99641c99d4 git Not specified
CNA Linux Linux affected ee841d0aff649164080e445e84885015958d8ff4 1857cdca12c4aff58bf26a7005a4d02850c29927 git Not specified
CNA Linux Linux affected ee841d0aff649164080e445e84885015958d8ff4 91eda032eb16e5d2be27c95584665bc555bb5a90 git Not specified
CNA Linux Linux affected ee841d0aff649164080e445e84885015958d8ff4 dc766c4830a7e1e1ee9d7f77d4ab344f2eb23c8e git Not specified
CNA Linux Linux affected ee841d0aff649164080e445e84885015958d8ff4 5ef9c94d7110e90260c06868cf1dcf899b9f25ee git Not specified
CNA Linux Linux affected ee841d0aff649164080e445e84885015958d8ff4 e50377c6b3f278c9f3ef017ffce17f5fcc9dace4 git Not specified
CNA Linux Linux affected ee841d0aff649164080e445e84885015958d8ff4 47b49c06eb62504075f0f2e2227aee2e2c2a58b3 git Not specified
CNA Linux Linux affected 1c7e17b1c4d60cc5aa575460f7efb73686dd3b39 git Not specified
CNA Linux Linux affected ac663c54f40b2830b1ca32d1ae9d683fe248b14c git Not specified
CNA Linux Linux affected 4.4.34 4.5 semver Not specified
CNA Linux Linux affected 4.8.10 4.9 semver Not specified
CNA Linux Linux affected 4.9 Not specified
CNA Linux Linux unaffected 4.9 semver Not specified
CNA Linux Linux unaffected 5.4.301 5.4.* semver Not specified
CNA Linux Linux unaffected 5.10.246 5.10.* semver Not specified
CNA Linux Linux unaffected 5.15.195 5.15.* semver Not specified
CNA Linux Linux unaffected 6.1.156 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.112 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.53 6.12.* semver Not specified
CNA Linux Linux unaffected 6.17.3 6.17.* semver Not specified
CNA Linux Linux unaffected 6.18 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/1198077606aeffb102587c6ea079ce99641c99d4 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/dc766c4830a7e1e1ee9d7f77d4ab344f2eb23c8e 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/91eda032eb16e5d2be27c95584665bc555bb5a90 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/5ef9c94d7110e90260c06868cf1dcf899b9f25ee 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/e50377c6b3f278c9f3ef017ffce17f5fcc9dace4 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/fdd43fe6d286f27b826572457a89c926f97e2d3a 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/1857cdca12c4aff58bf26a7005a4d02850c29927 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/47b49c06eb62504075f0f2e2227aee2e2c2a58b3 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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