{"id":"CVE-2026-90178","state":"PUBLISHED","title":"hwmon: (coretemp) Fix core_data leak on CPUs without PTS","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nhwmon: (coretemp) Fix core_data leak on CPUs without PTS\n\npdata->core_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->pkg_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->core_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->core_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.","publishedAt":"2026-09-17T16:07:03.759Z","updatedAt":"2026-10-19T08:59:15.321Z","severity":null,"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"1a793caf6f6991716cb07583ed7c27de84ef0cba","status":"affected","lessThan":"dc0d79b1be384e7f6a2308356afd10dcf3bf940f","versionType":"git"},{"version":"1a793caf6f6991716cb07583ed7c27de84ef0cba","status":"affected","lessThan":"86c1617b7d4b001b20a71deda3c791538a4fa6aa","versionType":"git"},{"version":"1a793caf6f6991716cb07583ed7c27de84ef0cba","status":"affected","lessThan":"9b23a010a1e8232974617c412cb9f578f3378b70","versionType":"git"},{"version":"1a793caf6f6991716cb07583ed7c27de84ef0cba","status":"affected","lessThan":"0cd8450c257faa0cece0e0c43d3b55d1a389acc7","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/hwmon/coretemp.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"6.9","status":"affected"},{"version":"0","status":"unaffected","lessThan":"6.9","versionType":"semver"},{"version":"6.12.110","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.52","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.2.6","status":"unaffected","lessThanOrEqual":"7.2.*","versionType":"semver"},{"version":"7.3","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/hwmon/coretemp.c"]}],"references":["https://git.kernel.org/stable/c/dc0d79b1be384e7f6a2308356afd10dcf3bf940f","https://git.kernel.org/stable/c/86c1617b7d4b001b20a71deda3c791538a4fa6aa","https://git.kernel.org/stable/c/9b23a010a1e8232974617c412cb9f578f3378b70","https://git.kernel.org/stable/c/0cd8450c257faa0cece0e0c43d3b55d1a389acc7"],"weaknesses":[],"ingestedAt":"2026-10-29T20:13:34.582Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/90xxx/CVE-2026-90178.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-90178","state":"PUBLISHED","datePublished":"2026-09-17T16:07:03.759Z","dateUpdated":"2026-10-19T08:59:15.321Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-09-11T19:38:34.791Z"},"containers":{"cna":{"title":"hwmon: (coretemp) Fix core_data leak on CPUs without PTS","descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nhwmon: (coretemp) Fix core_data leak on CPUs without PTS\n\npdata->core_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->pkg_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->core_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->core_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."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"1a793caf6f6991716cb07583ed7c27de84ef0cba","status":"affected","lessThan":"dc0d79b1be384e7f6a2308356afd10dcf3bf940f","versionType":"git"},{"version":"1a793caf6f6991716cb07583ed7c27de84ef0cba","status":"affected","lessThan":"86c1617b7d4b001b20a71deda3c791538a4fa6aa","versionType":"git"},{"version":"1a793caf6f6991716cb07583ed7c27de84ef0cba","status":"affected","lessThan":"9b23a010a1e8232974617c412cb9f578f3378b70","versionType":"git"},{"version":"1a793caf6f6991716cb07583ed7c27de84ef0cba","status":"affected","lessThan":"0cd8450c257faa0cece0e0c43d3b55d1a389acc7","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/hwmon/coretemp.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"6.9","status":"affected"},{"version":"0","status":"unaffected","lessThan":"6.9","versionType":"semver"},{"version":"6.12.110","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.52","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.2.6","status":"unaffected","lessThanOrEqual":"7.2.*","versionType":"semver"},{"version":"7.3","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/hwmon/coretemp.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/dc0d79b1be384e7f6a2308356afd10dcf3bf940f"},{"url":"https://git.kernel.org/stable/c/86c1617b7d4b001b20a71deda3c791538a4fa6aa"},{"url":"https://git.kernel.org/stable/c/9b23a010a1e8232974617c412cb9f578f3378b70"},{"url":"https://git.kernel.org/stable/c/0cd8450c257faa0cece0e0c43d3b55d1a389acc7"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-10-19T08:59:15.321Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.9","versionEndExcluding":"6.12.110"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.9","versionEndExcluding":"6.18.52"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.9","versionEndExcluding":"7.2.6"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.9","versionEndExcluding":"7.3"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}}}}}