Answer in brief
CVE-2025-40124 records a High severity (CVSS 7.8) vulnerability in sparc: fix accurate exception reporting in copy_{from_to}_user for UltraSPARC III. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 7.8. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=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 | fdd43fe6d286f27b826572457a89c926f97e2d3a, 1198077606aeffb102587c6ea079ce99641c99d4, 1857cdca12c4aff58bf26a7005a4d02850c29927, 91eda032eb16e5d2be27c95584665bc555bb5a90, dc766c4830a7e1e1ee9d7f77d4ab344f2eb23c8e, 5ef9c94d7110e90260c06868cf1dcf899b9f25ee, e50377c6b3f278c9f3ef017ffce17f5fcc9dace4, 47b49c06eb62504075f0f2e2227aee2e2c2a58b3, 4.5, 4.9 |
| Linux/Linuxgeneric | 4.9 | Not reported |
Published upstream
Nov 12, 2025
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Oct 19, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Aug 5, 2026
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 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.
Quoted source text, attributed separately from HOL analysis.