CVE-2025-40124 (GCVE-0-2025-40124)
Vulnerability from cvelistv5
Published
2025-11-12 10:23
Modified
2025-11-12 10:23
Severity ?
Summary
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.
References
Impacted products
Vendor Product Version
Linux Linux Version: ee841d0aff649164080e445e84885015958d8ff4
Version: ee841d0aff649164080e445e84885015958d8ff4
Version: ee841d0aff649164080e445e84885015958d8ff4
Version: ee841d0aff649164080e445e84885015958d8ff4
Version: ee841d0aff649164080e445e84885015958d8ff4
Version: ee841d0aff649164080e445e84885015958d8ff4
Version: ee841d0aff649164080e445e84885015958d8ff4
Version: ee841d0aff649164080e445e84885015958d8ff4
Version: 1c7e17b1c4d60cc5aa575460f7efb73686dd3b39
Version: ac663c54f40b2830b1ca32d1ae9d683fe248b14c
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{
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          "programFiles": [
            "arch/sparc/lib/U3memcpy.S"
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nsparc: fix accurate exception reporting in copy_{from_to}_user for UltraSPARC III\n\nAnthony Yznaga tracked down that a BUG_ON in ext4 code with large folios\nenabled resulted from copy_from_user() returning impossibly large values\ngreater than the size to be copied. This lead to __copy_from_iter()\nreturning impossible values instead of the actual number of bytes it was\nable to copy.\n\nThe BUG_ON has been reported in\nhttps://lore.kernel.org/r/b14f55642207e63e907965e209f6323a0df6dcee.camel@physik.fu-berlin.de\n\nThe referenced commit introduced exception handlers on user-space memory\nreferences in copy_from_user and copy_to_user. These handlers return from\nthe respective function and calculate the remaining bytes left to copy\nusing the current register contents. The exception handlers expect that\n%o2 has already been masked during the bulk copy loop, but the masking was\nperformed after that loop. This will fix the return value of copy_from_user\nand copy_to_user in the faulting case. The behaviour of memcpy stays\nunchanged."
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      "providerMetadata": {
        "dateUpdated": "2025-11-12T10:23:19.861Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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    "cveId": "CVE-2025-40124",
    "datePublished": "2025-11-12T10:23:19.861Z",
    "dateReserved": "2025-04-16T07:20:57.169Z",
    "dateUpdated": "2025-11-12T10:23:19.861Z",
    "state": "PUBLISHED"
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  }
}


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