{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2025-71102", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-01-13T15:30:19.651Z", "datePublished": "2026-01-14T15:05:52.389Z", "dateUpdated": "2026-01-14T15:05:52.389Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-01-14T15:05:52.389Z"}, "descriptions": [{"lang": "en", "value": "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."}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["kernel/scs.c"], "versions": [{"version": "5bbaf9d1fcb9be696ee9a61636ab6803556c70f2", "lessThan": "57ba40b001be27786d0570dd292289df748b306b", "status": "affected", "versionType": "git"}, {"version": "5bbaf9d1fcb9be696ee9a61636ab6803556c70f2", "lessThan": "062774439d442882b44f5eab8c256ad3423ef284", "status": "affected", "versionType": "git"}, {"version": "5bbaf9d1fcb9be696ee9a61636ab6803556c70f2", "lessThan": "9ef28943471a16e4f9646bc3e8e2de148e7d8d7b", "status": "affected", "versionType": "git"}, {"version": "5bbaf9d1fcb9be696ee9a61636ab6803556c70f2", "lessThan": "a19fb3611e4c06624fc0f83ef19f4fb8d57d4751", "status": "affected", "versionType": "git"}, {"version": "5bbaf9d1fcb9be696ee9a61636ab6803556c70f2", "lessThan": "08bd4c46d5e63b78e77f2605283874bbe868ab19", "status": "affected", "versionType": "git"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["kernel/scs.c"], "versions": [{"version": "5.8", "status": "affected"}, {"version": "0", "lessThan": "5.8", "status": "unaffected", "versionType": "semver"}, {"version": "6.1.160", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.6.120", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.64", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.3", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.19-rc1", "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": "5.8", "versionEndExcluding": "6.1.160"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.8", "versionEndExcluding": "6.6.120"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.8", "versionEndExcluding": "6.12.64"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.8", "versionEndExcluding": "6.18.3"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.8", "versionEndExcluding": "6.19-rc1"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/57ba40b001be27786d0570dd292289df748b306b"}, {"url": "https://git.kernel.org/stable/c/062774439d442882b44f5eab8c256ad3423ef284"}, {"url": "https://git.kernel.org/stable/c/9ef28943471a16e4f9646bc3e8e2de148e7d8d7b"}, {"url": "https://git.kernel.org/stable/c/a19fb3611e4c06624fc0f83ef19f4fb8d57d4751"}, {"url": "https://git.kernel.org/stable/c/08bd4c46d5e63b78e77f2605283874bbe868ab19"}], "title": "scs: fix a wrong parameter in __scs_magic", "x_generator": {"engine": "bippy-1.2.0"}}}}

{}

{"cveTags": [], "descriptions": [{"lang": "en", "value": "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."}], "id": "CVE-2025-71102", "lastModified": "2026-01-14T16:25:12.057", "metrics": {}, "published": "2026-01-14T15:15:59.210", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/062774439d442882b44f5eab8c256ad3423ef284"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/08bd4c46d5e63b78e77f2605283874bbe868ab19"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/57ba40b001be27786d0570dd292289df748b306b"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/9ef28943471a16e4f9646bc3e8e2de148e7d8d7b"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/a19fb3611e4c06624fc0f83ef19f4fb8d57d4751"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Awaiting Analysis"}

{}

{}