{"cve":"CVE-2025-71102","nvd":{"published":"2026-01-14T15:15:59.210","modified":"2026-06-17T10:03:40.040","status":"Analyzed","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nscs: fix a wrong parameter in __scs_magic\n\n__scs_magic() needs a 'void *' variable, but a 'struct task_struct *' is\ngiven.  'task_scs(tsk)' is the starting address of the task's shadow call\nstack, and '__scs_magic(task_scs(tsk))' is the end address of the task's\nshadow call stack.  Here should be '__scs_magic(task_scs(tsk))'.\n\nThe user-visible effect of this bug is that when CONFIG_DEBUG_STACK_USAGE\nis enabled, the shadow call stack usage checking function\n(scs_check_usage) would scan an incorrect memory range.  This could lead\n\n1. **Inaccurate stack usage reporting**: The function would calculate\n   wrong usage statistics for the shadow call stack, potentially showing\n   incorrect value in kmsg.\n\n2. **Potential kernel crash**: If the value of __scs_magic(tsk)is\n   greater than that of __scs_magic(task_scs(tsk)), the for loop may\n   access unmapped memory, potentially causing a kernel panic.  However,\n   this scenario is unlikely because task_struct is allocated via the slab\n   allocator (which typically returns lower addresses), while the shadow\n   call stack returned by task_scs(tsk) is allocated via vmalloc(which\n   typically returns higher addresses).\n\nHowever, since this is purely a debugging feature\n(CONFIG_DEBUG_STACK_USAGE), normal production systems should be not\nunaffected.  The bug only impacts developers and testers who are actively\ndebugging stack usage with this configuration enabled.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","score":5.5},"cwes":[],"references":["https://git.kernel.org/stable/c/062774439d442882b44f5eab8c256ad3423ef284","https://git.kernel.org/stable/c/08bd4c46d5e63b78e77f2605283874bbe868ab19","https://git.kernel.org/stable/c/1727e8bd69103a68963a5613a0ddb6d8d37df5d3","https://git.kernel.org/stable/c/57ba40b001be27786d0570dd292289df748b306b","https://git.kernel.org/stable/c/9ef28943471a16e4f9646bc3e8e2de148e7d8d7b"],"products":["linux:linux_kernel"],"source":"nvd","synced_at":"2026-10-19T22:19:41.481987139+00:00"},"epss":{"cve":"CVE-2025-71102","score":0.00147,"percentile":0.03885,"date":"2026-10-31"},"kev":null,"osv":[],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}