{"id":"CVE-2025-40126","state":"PUBLISHED","title":"sparc: fix accurate exception reporting in copy_{from_to}_user for UltraSPARC","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nsparc: fix accurate exception reporting in copy_{from_to}_user for UltraSPARC\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. This commit fixes a couple of bad\ncalculations. This will fix the return value of copy_from_user and\ncopy_to_user in the faulting case. The behaviour of memcpy stays unchanged.","publishedAt":"2025-11-12T10:23:20.460Z","updatedAt":"2026-05-23T16:01:29.763Z","severity":null,"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"cb736fdbb208eb3420f1a2eb2bfc024a6e9dcada","status":"affected","lessThan":"0bf3dc3a2156f1c5ddaba4b85d09767874634114","versionType":"git"},{"version":"cb736fdbb208eb3420f1a2eb2bfc024a6e9dcada","status":"affected","lessThan":"41c18baee66134e6ef786eb075c1b6adb22432b0","versionType":"git"},{"version":"cb736fdbb208eb3420f1a2eb2bfc024a6e9dcada","status":"affected","lessThan":"59424dc0d0e044b2eb007686a4724ddd91d57db5","versionType":"git"},{"version":"cb736fdbb208eb3420f1a2eb2bfc024a6e9dcada","status":"affected","lessThan":"9b137f277cc3297044aabd950f589e505d30104c","versionType":"git"},{"version":"cb736fdbb208eb3420f1a2eb2bfc024a6e9dcada","status":"affected","lessThan":"674ff598148a28bae0b5372339de56f2abf0b1d1","versionType":"git"},{"version":"cb736fdbb208eb3420f1a2eb2bfc024a6e9dcada","status":"affected","lessThan":"7de3a75bbc8465d816336c74d50109e73501efab","versionType":"git"},{"version":"cb736fdbb208eb3420f1a2eb2bfc024a6e9dcada","status":"affected","lessThan":"57c278500fce3cd4e1c540700c0b05426a958393","versionType":"git"},{"version":"cb736fdbb208eb3420f1a2eb2bfc024a6e9dcada","status":"affected","lessThan":"4fba1713001195e59cfc001ff1f2837dab877efb","versionType":"git"},{"version":"1731d90d8a558ecb20cdee0c2c001ae8e15c251d","status":"affected","versionType":"git"},{"version":"b0580eadc19ff3a617a7d07cfaf2a985153c114e","status":"affected","versionType":"git"},{"version":"4.4.34","status":"affected","lessThan":"4.5","versionType":"semver"},{"version":"4.8.10","status":"affected","lessThan":"4.9","versionType":"semver"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["arch/sparc/lib/U1memcpy.S"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"4.9","status":"affected"},{"version":"0","status":"unaffected","lessThan":"4.9","versionType":"semver"},{"version":"5.4.301","status":"unaffected","lessThanOrEqual":"5.4.*","versionType":"semver"},{"version":"5.10.246","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.195","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.156","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.112","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.53","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.17.3","status":"unaffected","lessThanOrEqual":"6.17.*","versionType":"semver"},{"version":"6.18","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["arch/sparc/lib/U1memcpy.S"]}],"references":["https://git.kernel.org/stable/c/0bf3dc3a2156f1c5ddaba4b85d09767874634114","https://git.kernel.org/stable/c/41c18baee66134e6ef786eb075c1b6adb22432b0","https://git.kernel.org/stable/c/59424dc0d0e044b2eb007686a4724ddd91d57db5","https://git.kernel.org/stable/c/9b137f277cc3297044aabd950f589e505d30104c","https://git.kernel.org/stable/c/674ff598148a28bae0b5372339de56f2abf0b1d1","https://git.kernel.org/stable/c/7de3a75bbc8465d816336c74d50109e73501efab","https://git.kernel.org/stable/c/57c278500fce3cd4e1c540700c0b05426a958393","https://git.kernel.org/stable/c/4fba1713001195e59cfc001ff1f2837dab877efb"],"weaknesses":[],"ingestedAt":"2026-10-29T20:09:09.358Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2025/40xxx/CVE-2025-40126.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2025-40126","state":"PUBLISHED","datePublished":"2025-11-12T10:23:20.460Z","dateUpdated":"2026-05-23T16:01:29.763Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2025-04-16T07:20:57.169Z"},"containers":{"cna":{"title":"sparc: fix accurate exception reporting in copy_{from_to}_user for UltraSPARC","descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nsparc: fix accurate exception reporting in copy_{from_to}_user for UltraSPARC\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. This commit fixes a couple of bad\ncalculations. This will fix the return value of copy_from_user and\ncopy_to_user in the faulting case. The behaviour of memcpy stays unchanged."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"cb736fdbb208eb3420f1a2eb2bfc024a6e9dcada","status":"affected","lessThan":"0bf3dc3a2156f1c5ddaba4b85d09767874634114","versionType":"git"},{"version":"cb736fdbb208eb3420f1a2eb2bfc024a6e9dcada","status":"affected","lessThan":"41c18baee66134e6ef786eb075c1b6adb22432b0","versionType":"git"},{"version":"cb736fdbb208eb3420f1a2eb2bfc024a6e9dcada","status":"affected","lessThan":"59424dc0d0e044b2eb007686a4724ddd91d57db5","versionType":"git"},{"version":"cb736fdbb208eb3420f1a2eb2bfc024a6e9dcada","status":"affected","lessThan":"9b137f277cc3297044aabd950f589e505d30104c","versionType":"git"},{"version":"cb736fdbb208eb3420f1a2eb2bfc024a6e9dcada","status":"affected","lessThan":"674ff598148a28bae0b5372339de56f2abf0b1d1","versionType":"git"},{"version":"cb736fdbb208eb3420f1a2eb2bfc024a6e9dcada","status":"affected","lessThan":"7de3a75bbc8465d816336c74d50109e73501efab","versionType":"git"},{"version":"cb736fdbb208eb3420f1a2eb2bfc024a6e9dcada","status":"affected","lessThan":"57c278500fce3cd4e1c540700c0b05426a958393","versionType":"git"},{"version":"cb736fdbb208eb3420f1a2eb2bfc024a6e9dcada","status":"affected","lessThan":"4fba1713001195e59cfc001ff1f2837dab877efb","versionType":"git"},{"version":"1731d90d8a558ecb20cdee0c2c001ae8e15c251d","status":"affected","versionType":"git"},{"version":"b0580eadc19ff3a617a7d07cfaf2a985153c114e","status":"affected","versionType":"git"},{"version":"4.4.34","status":"affected","lessThan":"4.5","versionType":"semver"},{"version":"4.8.10","status":"affected","lessThan":"4.9","versionType":"semver"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["arch/sparc/lib/U1memcpy.S"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"4.9","status":"affected"},{"version":"0","status":"unaffected","lessThan":"4.9","versionType":"semver"},{"version":"5.4.301","status":"unaffected","lessThanOrEqual":"5.4.*","versionType":"semver"},{"version":"5.10.246","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.195","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.156","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.112","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.53","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.17.3","status":"unaffected","lessThanOrEqual":"6.17.*","versionType":"semver"},{"version":"6.18","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["arch/sparc/lib/U1memcpy.S"]}],"references":[{"url":"https://git.kernel.org/stable/c/0bf3dc3a2156f1c5ddaba4b85d09767874634114"},{"url":"https://git.kernel.org/stable/c/41c18baee66134e6ef786eb075c1b6adb22432b0"},{"url":"https://git.kernel.org/stable/c/59424dc0d0e044b2eb007686a4724ddd91d57db5"},{"url":"https://git.kernel.org/stable/c/9b137f277cc3297044aabd950f589e505d30104c"},{"url":"https://git.kernel.org/stable/c/674ff598148a28bae0b5372339de56f2abf0b1d1"},{"url":"https://git.kernel.org/stable/c/7de3a75bbc8465d816336c74d50109e73501efab"},{"url":"https://git.kernel.org/stable/c/57c278500fce3cd4e1c540700c0b05426a958393"},{"url":"https://git.kernel.org/stable/c/4fba1713001195e59cfc001ff1f2837dab877efb"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-05-23T16:01:29.763Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.9","versionEndExcluding":"5.4.301"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.9","versionEndExcluding":"5.10.246"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.9","versionEndExcluding":"5.15.195"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.9","versionEndExcluding":"6.1.156"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.9","versionEndExcluding":"6.6.112"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.9","versionEndExcluding":"6.12.53"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.9","versionEndExcluding":"6.17.3"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.9","versionEndExcluding":"6.18"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.4.34"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:li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