CVE-2025-40112

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2025-40112", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2025-04-16T07:20:57.167Z", "datePublished": "2025-11-12T10:23:16.690Z", "dateUpdated": "2026-08-05T12:07:52.886Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T12:07:52.886Z"}, "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 Niagara\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 and a broken epilogue in the exception handlers. This will\nprevent crashes and ensure correct return values of copy_from_user and\ncopy_to_user in the faulting case. The behaviour of memcpy stays unchanged."}], "metrics": [{"cvssV3_1": {"version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "baseScore": 7.8, "baseSeverity": "HIGH"}, "scenarios": [{"lang": "en", "value": "AV:L - The fault must occur on the calling process's own user-space buffer during a syscall, so the attacker needs local execution to issue syscalls with a deliberately unmapped/PROT_NONE user address. No remote or adjacent-network path can drive copy_from_user/copy_to_user faults on behalf of another task.\nAC:L - The attacker fully controls every precondition \u2014 mmap a buffer, punch a PROT_NONE/unmapped page, and pick the length and alignment that steer the copy into the buggy 16-byte or unaligned loop; the broken __restore_asi epilogue is hit on every fault regardless. No race, no memory-layout luck, and the Niagara copy routines are auto-selected by CPU type with no special kernel config.\nPR:L - Any unprivileged local user can pass a partially-invalid user pointer to ordinary syscalls such as read(), write(), sendmsg() or ioctl(); no capability, namespace or filesystem privilege is involved.\nUI:N - The attacking process triggers the faulting copy entirely on its own via a syscall; no action by another user or administrator is needed.\nS:U - The corruption is confined to the kernel of the running system \u2014 no hypervisor, IOMMU or sandbox boundary is crossed.\nC:H - The under-reported remainder leaves 8\u201316 bytes of the kernel destination buffer unzeroed by _inline_copy_from_user()'s memset and treated as valid user data, repeatedly leaking stale kernel heap/stack contents into buffers that syscalls process or write back; the missing register-window restore additionally exposes kernel pointers as the copy's return value.\nI:H - The dead `restore` makes raw_copy_from_user return a destination pointer instead of a byte count, so memset(to + (n - res), 0, res) becomes an unbounded out-of-bounds kernel write, and the unpopped register window leaves the caller with a corrupted %sp/%fp and a wrong saved return address \u2014 memory corruption with attacker-influenced pointers and hijackable control flow.\nA:H - Returning without restoring the register window desynchronizes the entire SPARC window stack and the caller's stack frame, and the giant memset length guarantees a wild write; the result is an immediate kernel oops/panic on every triggered fault, trivially repeatable by an unprivileged user."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["arch/sparc/lib/NGmemcpy.S"], "versions": [{"version": "7ae3aaf53f1695877ccd5ebbc49ea65991e41f1e", "lessThan": "05440320ea3e249d5f984918f2bf51210c1a7c03", "status": "affected", "versionType": "git"}, {"version": "7ae3aaf53f1695877ccd5ebbc49ea65991e41f1e", "lessThan": "7823fc4d8ab5e57f8db7806ff2530c03c166c4bb", "status": "affected", "versionType": "git"}, {"version": "7ae3aaf53f1695877ccd5ebbc49ea65991e41f1e", "lessThan": "37547d8e6eba87507279ee3dfddfd9dc46335454", "status": "affected", "versionType": "git"}, {"version": "7ae3aaf53f1695877ccd5ebbc49ea65991e41f1e", "lessThan": "a365ee556e45f780ee322b349a06efdad0c1458f", "status": "affected", "versionType": "git"}, {"version": "7ae3aaf53f1695877ccd5ebbc49ea65991e41f1e", "lessThan": "8cdeb5e482d3fdce7e825444b6ca3865e24c0228", "status": "affected", "versionType": "git"}, {"version": "7ae3aaf53f1695877ccd5ebbc49ea65991e41f1e", "lessThan": "a90ce516a73dbe087f9bf3dbf311301a58d125c6", "status": "affected", "versionType": "git"}, {"version": "7ae3aaf53f1695877ccd5ebbc49ea65991e41f1e", "lessThan": "088c5098ec6d6b0396edfbf3dad3e81de8469c1c", "status": "affected", "versionType": "git"}, {"version": "7ae3aaf53f1695877ccd5ebbc49ea65991e41f1e", "lessThan": "0b67c8fc10b13a9090340c5f8a37d308f4e1571c", "status": "affected", "versionType": "git"}, {"version": "bfc8be6593097cb074d3912ba2f27565cfbb7d6e", "status": "affected", "versionType": "git"}, {"version": "a15859f9d8396cce7c55ccdb7e75f70f14cbc349", "status": "affected", "versionType": "git"}, {"version": "4.4.34", "lessThan": "4.5", "status": "affected", "versionType": "semver"}, {"version": "4.8.10", "lessThan": "4.9", "status": "affected", "versionType": "semver"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["arch/sparc/lib/NGmemcpy.S"], "versions": [{"version": "4.9", "status": "affected"}, {"version": "0", "lessThan": "4.9", "status": "unaffected", "versionType": "semver"}, {"version": "5.4.301", "lessThanOrEqual": "5.4.*", "status": "unaffected", "versionType": "semver"}, {"version": "5.10.246", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver"}, {"version": "5.15.195", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.1.156", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.6.112", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.53", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.17.3", "lessThanOrEqual": "6.17.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.18", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix"}]}], "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"}, 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copy_{from_to}_user for Niagara", "x_generator": {"engine": "bippy-1.2.0"}}}}

{}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["arch/sparc/lib/NGmemcpy.S"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "05440320ea3e249d5f984918f2bf51210c1a7c03", "status": "affected", "version": "7ae3aaf53f1695877ccd5ebbc49ea65991e41f1e", "versionType": "git"}, {"lessThan": "7823fc4d8ab5e57f8db7806ff2530c03c166c4bb", "status": "affected", "version": "7ae3aaf53f1695877ccd5ebbc49ea65991e41f1e", "versionType": "git"}, {"lessThan": "37547d8e6eba87507279ee3dfddfd9dc46335454", "status": "affected", "version": "7ae3aaf53f1695877ccd5ebbc49ea65991e41f1e", "versionType": "git"}, {"lessThan": "a365ee556e45f780ee322b349a06efdad0c1458f", "status": "affected", "version": "7ae3aaf53f1695877ccd5ebbc49ea65991e41f1e", "versionType": "git"}, {"lessThan": "8cdeb5e482d3fdce7e825444b6ca3865e24c0228", "status": "affected", "version": "7ae3aaf53f1695877ccd5ebbc49ea65991e41f1e", "versionType": "git"}, {"lessThan": "a90ce516a73dbe087f9bf3dbf311301a58d125c6", "status": "affected", "version": "7ae3aaf53f1695877ccd5ebbc49ea65991e41f1e", "versionType": "git"}, {"lessThan": "088c5098ec6d6b0396edfbf3dad3e81de8469c1c", "status": "affected", "version": "7ae3aaf53f1695877ccd5ebbc49ea65991e41f1e", "versionType": "git"}, {"lessThan": "0b67c8fc10b13a9090340c5f8a37d308f4e1571c", "status": "affected", "version": "7ae3aaf53f1695877ccd5ebbc49ea65991e41f1e", "versionType": "git"}, {"status": "affected", "version": "bfc8be6593097cb074d3912ba2f27565cfbb7d6e", "versionType": "git"}, {"status": "affected", "version": "a15859f9d8396cce7c55ccdb7e75f70f14cbc349", "versionType": "git"}, {"lessThan": "4.5", "status": "affected", "version": "4.4.34", "versionType": "semver"}, {"lessThan": "4.9", "status": "affected", "version": "4.8.10", "versionType": "semver"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["arch/sparc/lib/NGmemcpy.S"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "4.9"}, {"lessThan": "4.9", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "5.4.*", "status": "unaffected", "version": "5.4.301", "versionType": "semver"}, {"lessThanOrEqual": "5.10.*", "status": "unaffected", "version": "5.10.246", "versionType": "semver"}, {"lessThanOrEqual": "5.15.*", "status": "unaffected", "version": "5.15.195", "versionType": "semver"}, {"lessThanOrEqual": "6.1.*", "status": "unaffected", "version": "6.1.156", "versionType": "semver"}, {"lessThanOrEqual": "6.6.*", "status": "unaffected", "version": "6.6.112", "versionType": "semver"}, {"lessThanOrEqual": "6.12.*", "status": "unaffected", "version": "6.12.53", "versionType": "semver"}, {"lessThanOrEqual": "6.17.*", "status": "unaffected", "version": "6.17.3", "versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "6.18", "versionType": "original_commit_for_fix"}]}], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "cveTags": [], "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 Niagara\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 and a broken epilogue in the exception handlers. This will\nprevent crashes and ensure correct return values of copy_from_user and\ncopy_to_user in the faulting case. The behaviour of memcpy stays unchanged."}, {"lang": "es", "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nsparc: corrige el informe preciso de excepciones en copy_{from_to}_user para Niagara\n\nEl commit referenciado introdujo manejadores de excepciones en referencias de memoria de espacio de usuario en copy_from_user y copy_to_user. Estos manejadores regresan de la funci\u00f3n respectiva y calculan los bytes restantes por copiar utilizando el contenido actual del registro. Este commit corrige un par de c\u00e1lculos err\u00f3neos y un ep\u00edlogo roto en los manejadores de excepciones. Esto evitar\u00e1 fallos y asegurar\u00e1 valores de retorno correctos de copy_from_user y copy_to_user en el caso de fallo. El comportamiento de memcpy permanece sin cambios."}], "id": "CVE-2025-40112", "lastModified": "2026-10-19T21:10:00.160", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 7.8, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 5.9, "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary"}]}, "published": "2025-11-12T11:15:40.460", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/05440320ea3e249d5f984918f2bf51210c1a7c03"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/088c5098ec6d6b0396edfbf3dad3e81de8469c1c"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/0b67c8fc10b13a9090340c5f8a37d308f4e1571c"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/37547d8e6eba87507279ee3dfddfd9dc46335454"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/7823fc4d8ab5e57f8db7806ff2530c03c166c4bb"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/8cdeb5e482d3fdce7e825444b6ca3865e24c0228"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/a365ee556e45f780ee322b349a06efdad0c1458f"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/a90ce516a73dbe087f9bf3dbf311301a58d125c6"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Deferred"}

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{"created": "2025-11-12T22:12:43.035612+00:00", "updated": "2025-11-12T22:12:43.035640+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}