{"id":"CVE-2026-90178","title":"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 i…","summary":"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 i…","severity":"medium","vendor":"Linux","product":"Linux","affected":["Linux >= 1a793caf6f6991716cb07583ed7c27de84ef0cba < dc0d79b1be384e7f6a2308356afd10dcf3bf940f","Linux >= 1a793caf6f6991716cb07583ed7c27de84ef0cba < 86c1617b7d4b001b20a71deda3c791538a4fa6aa","Linux >= 1a793caf6f6991716cb07583ed7c27de84ef0cba < 9b23a010a1e8232974617c412cb9f578f3378b70","Linux >= 1a793caf6f6991716cb07583ed7c27de84ef0cba < 0cd8450c257faa0cece0e0c43d3b55d1a389acc7","Linux 6.9"],"published":"2026-09-17","updated":"2026-09-17","sourceUpdated":"2026-09-17T17:17:11.807","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-90178","references":[{"url":"https://git.kernel.org/stable/c/0cd8450c257faa0cece0e0c43d3b55d1a389acc7","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/86c1617b7d4b001b20a71deda3c791538a4fa6aa","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/9b23a010a1e8232974617c412cb9f578f3378b70","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/dc0d79b1be384e7f6a2308356afd10dcf3bf940f","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-90178.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-90178"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2536686"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-90178"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-90178"},{"url":"https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-90178.mbox"}],"tags":["nvd","cve.org","csaf","vex","red-hat"],"ingestedAt":"2026-09-17T16:21:47.867Z","epss":0.00168,"epssPercentile":0.06016,"cvss":5.5,"cvssVector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","cvssSource":"vendor","cwe":["CWE-772"],"slug":"CVE-2026-90178","body":"## Overview\n\nIn 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.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.\n\n## Vendor advisories\n\n- **Red Hat VEX** · Low · affected: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 6 · no fix planned: Red Hat Enterprise Linux 6, Red Hat Enterprise Linux 10 · updated 2026-09-30 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-90178.json)","depth":"sunlit","depthScore":30,"depthScoreParts":{"impact":30.3,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[{"seq":214163,"id":"CVE-2026-90178","ts":1790841317142,"field":"cvss","old":null,"new":"5.5"},{"seq":214162,"id":"CVE-2026-90178","ts":1790841317142,"field":"severity","old":"none","new":"medium"}]}