{"id":"CVE-2026-90178","summary":"hwmon: (coretemp) Fix core_data leak on CPUs without PTS","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nhwmon: (coretemp) Fix core_data leak on CPUs without PTS\n\npdata-\u003ecore_data is allocated in init_temp_data() when the first core\ntemp_data of a package is created, but it is only released from\ndestroy_temp_data(), and only in the branch that handles the package\ntemp_data.\n\nPackage temp_data is created solely when the CPU supports\nX86_FEATURE_PTS. On a CPU without it, coretemp_cpu_online() never calls\ncoretemp_add_core() with pkg_flag set, so pdata-\u003epkg_data stays NULL.\ncoretemp_cpu_offline() then skips the removal of the package interface,\ndestroy_temp_data() is never called for package data, and the array is\nstill allocated when coretemp_device_remove() frees the platform data\nthat pointed at it.\n\nRelease the array in coretemp_device_remove(). destroy_temp_data() sets\npdata-\u003ecore_data to NULL when it frees it, so the added kfree() is a\nno-op on CPUs that do have PTS.\n\nTested on an Intel Core i5-1135G7. The driver was instrumented to log\nevery allocation and release of pdata-\u003ecore_data, and the PTS check in\ncoretemp_cpu_online() was patched out to emulate a CPU without package\nthermal support. Without this change the array was allocated and never\nreleased, and coretemp_device_remove() still saw a non-NULL pointer.\nWith it the array is released and the pointer accounting balances. On an\nunmodified build the release still happens via the package temp_data and\nthe added kfree() sees NULL, with no slab warnings over repeated module\nload and unload cycles.","modified":"2026-09-19T03:47:28.762768288Z","published":"2026-09-17T16:07:03.759Z","database_specific":{"cna_assigner":"Linux","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/90xxx/CVE-2026-90178.json"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/0cd8450c257faa0cece0e0c43d3b55d1a389acc7"},{"type":"WEB","url":"https://git.kernel.org/stable/c/86c1617b7d4b001b20a71deda3c791538a4fa6aa"},{"type":"WEB","url":"https://git.kernel.org/stable/c/9b23a010a1e8232974617c412cb9f578f3378b70"},{"type":"WEB","url":"https://git.kernel.org/stable/c/dc0d79b1be384e7f6a2308356afd10dcf3bf940f"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/90xxx/CVE-2026-90178.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-90178"},{"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":"1a793caf6f6991716cb07583ed7c27de84ef0cba"},{"fixed":"dc0d79b1be384e7f6a2308356afd10dcf3bf940f"},{"fixed":"86c1617b7d4b001b20a71deda3c791538a4fa6aa"},{"fixed":"9b23a010a1e8232974617c412cb9f578f3378b70"},{"fixed":"0cd8450c257faa0cece0e0c43d3b55d1a389acc7"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-90178.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"6.9.0"},{"fixed":"6.12.110"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.13.0"},{"fixed":"6.18.52"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.19.0"},{"fixed":"7.2.6"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-90178.json"}}],"schema_version":"1.9.0"}