CVE-2025-40112

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

At a glance

Severity
HIGH 7.8
EPSS
EPSS 0.17 % · percentile 6 (2026-10-27)
State
PUBLISHED
Published
Updated
Assigner
Linux
NVD status
Deferred

Description

In the Linux kernel, the following vulnerability has been resolved: sparc: fix accurate exception reporting in copy_{from_to}_user for Niagara 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. This commit fixes a couple of bad calculations and a broken epilogue in the exception handlers. This will prevent crashes and ensure correct return values of copy_from_user and copy_to_user in the faulting case. The behaviour of memcpy stays unchanged.

Scores

VersionScoreVectorScored by
CVSS 3.1HIGH 7.8CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:HLinux
CVSS 3.1HIGH 7.8CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:HNVD · 416baaa9-dc9f-4396-8d5f-8c081fb06d67 (Secondary)

European references

CERT-FR advisories

Affected products

ProductVersions
Linux · Linuxaffected 7ae3aaf53f1695877ccd5ebbc49ea65991e41f1e < 05440320ea3e249d5f984918f2bf51210c1a7c03 ; affected 7ae3aaf53f1695877ccd5ebbc49ea65991e41f1e < 7823fc4d8ab5e57f8db7806ff2530c03c166c4bb ; affected 7ae3aaf53f1695877ccd5ebbc49ea65991e41f1e < 37547d8e6eba87507279ee3dfddfd9dc46335454 ; affected 7ae3aaf53f1695877ccd5ebbc49ea65991e41f1e < a365ee556e45f780ee322b349a06efdad0c1458f ; affected 7ae3aaf53f1695877ccd5ebbc49ea65991e41f1e < 8cdeb5e482d3fdce7e825444b6ca3865e24c0228 ; affected 7ae3aaf53f1695877ccd5ebbc49ea65991e41f1e < a90ce516a73dbe087f9bf3dbf311301a58d125c6
Linux · Linuxaffected 4.9 ; unaffected 0 < 4.9 ; unaffected 5.4.301 ≤ 5.4.* ; unaffected 5.10.246 ≤ 5.10.* ; unaffected 5.15.195 ≤ 5.15.* ; unaffected 6.1.156 ≤ 6.1.*

References

Sources

SourceLicence
CVE List (CVEProject cvelistV5)CVE Program Terms of Use
EPSS (FIRST.org)FIRST — attribution requested
ENISA EUVDENISA — reproduction authorised, source acknowledged
CERT-FR (ANSSI)Licence Ouverte / Etalab 2.0
NVD (NIST) via fkie-cad/nvd-json-data-feedsPublic domain — this product uses data from the NVD API but is not endorsed or certified by the NVD