CVE-2025-40126

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

N/A

Published: November 12, 2025 at 10:23 AM UTC

Updated: October 19, 2026 at 09:10 PM UTC

1 product affected across 1 vendorLinux Kernel

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Severity

N/A

Exploit prediction

EPSS 0.2%

Description

In the Linux kernel, the following vulnerability has been resolved: sparc: fix accurate exception reporting in copy_{from_to}_user for UltraSPARC 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. This will fix the return value of copy_from_user and copy_to_user in the faulting case. The behaviour of memcpy stays unchanged.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Linux Kernel · Linux

90%

4.4.34 ≤ v < 4.54.8.10 ≤ v < 4.91731d90d8a558ecb20cdee0c2c001ae8e15c251d4.4.34 4.8.10 4.9b0580eadc19ff3a617a7d07cfaf2a985153c114ecb736fdbb208eb3420f1a2eb2bfc024a6e9dcada

Vendor states this is fixed in 0bf3dc3a2156f1c5ddaba4b85d09767874634114 (fixed)

Vendor states this is fixed in 41c18baee66134e6ef786eb075c1b6adb22432b0 (fixed)

Vendor states this is fixed in 4fba1713001195e59cfc001ff1f2837dab877efb (fixed)

Vendor states this is fixed in 57c278500fce3cd4e1c540700c0b05426a958393 (fixed)

Vendor states this is fixed in 59424dc0d0e044b2eb007686a4724ddd91d57db5 (fixed)

Vendor states this is fixed in 674ff598148a28bae0b5372339de56f2abf0b1d1 (fixed)

Vendor states this is fixed in 7de3a75bbc8465d816336c74d50109e73501efab (fixed)

Vendor states this is fixed in 9b137f277cc3297044aabd950f589e505d30104c (fixed)

Affected range stops below 4.5, so it looks safe — our inference, not a vendor statement

Vendor states this is fixed in 4.9 (unaffected)

Vendor states this is fixed in 5.10.246 (unaffected)

Vendor states this is fixed in 5.15.195 (unaffected)