CVE-2025-71102 (GCVE-0-2025-71102)

Vulnerability from cvelistv5 – Published: 2026-01-14 15:05 – Updated: 2026-05-11 21:54
VLAI
Title
scs: fix a wrong parameter in __scs_magic
Summary
In the Linux kernel, the following vulnerability has been resolved: scs: fix a wrong parameter in __scs_magic __scs_magic() needs a 'void *' variable, but a 'struct task_struct *' is given. 'task_scs(tsk)' is the starting address of the task's shadow call stack, and '__scs_magic(task_scs(tsk))' is the end address of the task's shadow call stack. Here should be '__scs_magic(task_scs(tsk))'. The user-visible effect of this bug is that when CONFIG_DEBUG_STACK_USAGE is enabled, the shadow call stack usage checking function (scs_check_usage) would scan an incorrect memory range. This could lead 1. **Inaccurate stack usage reporting**: The function would calculate wrong usage statistics for the shadow call stack, potentially showing incorrect value in kmsg. 2. **Potential kernel crash**: If the value of __scs_magic(tsk)is greater than that of __scs_magic(task_scs(tsk)), the for loop may access unmapped memory, potentially causing a kernel panic. However, this scenario is unlikely because task_struct is allocated via the slab allocator (which typically returns lower addresses), while the shadow call stack returned by task_scs(tsk) is allocated via vmalloc(which typically returns higher addresses). However, since this is purely a debugging feature (CONFIG_DEBUG_STACK_USAGE), normal production systems should be not unaffected. The bug only impacts developers and testers who are actively debugging stack usage with this configuration enabled.
Severity
5.5 (Medium)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 5bbaf9d1fcb9be696ee9a61636ab6803556c70f2 , < 1727e8bd69103a68963a5613a0ddb6d8d37df5d3 (git)
Affected: 5bbaf9d1fcb9be696ee9a61636ab6803556c70f2 , < cfdf6250b63b953b1d8e60814c8ca96c6f9d1c8c (git)
Affected: 5bbaf9d1fcb9be696ee9a61636ab6803556c70f2 , < 57ba40b001be27786d0570dd292289df748b306b (git)
Affected: 5bbaf9d1fcb9be696ee9a61636ab6803556c70f2 , < 062774439d442882b44f5eab8c256ad3423ef284 (git)
Affected: 5bbaf9d1fcb9be696ee9a61636ab6803556c70f2 , < 9ef28943471a16e4f9646bc3e8e2de148e7d8d7b (git)
Affected: 5bbaf9d1fcb9be696ee9a61636ab6803556c70f2 , < a19fb3611e4c06624fc0f83ef19f4fb8d57d4751 (git)
Affected: 5bbaf9d1fcb9be696ee9a61636ab6803556c70f2 , < 08bd4c46d5e63b78e77f2605283874bbe868ab19 (git)
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Linux Linux Affected: 5.8
Unaffected: 0 , < 5.8 (semver)
Unaffected: 5.10.248 , ≤ 5.10.* (semver)
Unaffected: 5.15.198 , ≤ 5.15.* (semver)
Unaffected: 6.1.160 , ≤ 6.1.* (semver)
Unaffected: 6.6.120 , ≤ 6.6.* (semver)
Unaffected: 6.12.64 , ≤ 6.12.* (semver)
Unaffected: 6.18.3 , ≤ 6.18.* (semver)
Unaffected: 6.19 , ≤ * (original_commit_for_fix)
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}


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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

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  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
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  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
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