{"id":"CVE-2025-40124","summary":"sparc: fix accurate exception reporting in copy_{from_to}_user for UltraSPARC III","details":"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.","modified":"2026-03-20T12:43:11.300541Z","published":"2025-11-12T10:23:19.861Z","database_specific":{"cna_assigner":"Linux","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/40xxx/CVE-2025-40124.json"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/1198077606aeffb102587c6ea079ce99641c99d4"},{"type":"WEB","url":"https://git.kernel.org/stable/c/1857cdca12c4aff58bf26a7005a4d02850c29927"},{"type":"WEB","url":"https://git.kernel.org/stable/c/47b49c06eb62504075f0f2e2227aee2e2c2a58b3"},{"type":"WEB","url":"https://git.kernel.org/stable/c/5ef9c94d7110e90260c06868cf1dcf899b9f25ee"},{"type":"WEB","url":"https://git.kernel.org/stable/c/91eda032eb16e5d2be27c95584665bc555bb5a90"},{"type":"WEB","url":"https://git.kernel.org/stable/c/dc766c4830a7e1e1ee9d7f77d4ab344f2eb23c8e"},{"type":"WEB","url":"https://git.kernel.org/stable/c/e50377c6b3f278c9f3ef017ffce17f5fcc9dace4"},{"type":"WEB","url":"https://git.kernel.org/stable/c/fdd43fe6d286f27b826572457a89c926f97e2d3a"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/40xxx/CVE-2025-40124.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2025-40124"},{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"ee841d0aff649164080e445e84885015958d8ff4"},{"fixed":"fdd43fe6d286f27b826572457a89c926f97e2d3a"},{"fixed":"1198077606aeffb102587c6ea079ce99641c99d4"},{"fixed":"1857cdca12c4aff58bf26a7005a4d02850c29927"},{"fixed":"91eda032eb16e5d2be27c95584665bc555bb5a90"},{"fixed":"dc766c4830a7e1e1ee9d7f77d4ab344f2eb23c8e"},{"fixed":"5ef9c94d7110e90260c06868cf1dcf899b9f25ee"},{"fixed":"e50377c6b3f278c9f3ef017ffce17f5fcc9dace4"},{"fixed":"47b49c06eb62504075f0f2e2227aee2e2c2a58b3"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"0"},{"last_affected":"1c7e17b1c4d60cc5aa575460f7efb73686dd3b39"},{"last_affected":"ac663c54f40b2830b1ca32d1ae9d683fe248b14c"}]}],"database_specific":{"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2025-40124.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"4.9.0"},{"fixed":"5.4.301"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.5.0"},{"fixed":"5.10.246"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.11.0"},{"fixed":"5.15.195"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.16.0"},{"fixed":"6.1.156"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.2.0"},{"fixed":"6.6.112"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.7.0"},{"fixed":"6.12.53"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.13.0"},{"fixed":"6.17.3"}]}],"database_specific":{"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2025-40124.json"}}],"schema_version":"1.7.5"}