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CVE-2025-71102— scs: fix a wrong parameter in __scs_magic

Quick assessment

Affected
Linux Linux
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于__scs_magic函数参数错误，可能导致不准确的堆栈使用报告或内核崩溃。

AI Predicted 5.5 Difficulty: Moderate EPSS 0.15% · P4

Possible ATT&CK Techniques 1 AI

T1003 · OS Credential Dumping

Affected Version Matrix 16

VendorProduct Version RangeStatus
Linux Linux 5bbaf9d1fcb9be696ee9a61636ab6803556c70f2< 1727e8bd69103a68963a5613a0ddb6d8d37df5d3 affected
5bbaf9d1fcb9be696ee9a61636ab6803556c70f2< cfdf6250b63b953b1d8e60814c8ca96c6f9d1c8c affected
5bbaf9d1fcb9be696ee9a61636ab6803556c70f2< 57ba40b001be27786d0570dd292289df748b306b affected
5bbaf9d1fcb9be696ee9a61636ab6803556c70f2< 062774439d442882b44f5eab8c256ad3423ef284 affected
5bbaf9d1fcb9be696ee9a61636ab6803556c70f2< 9ef28943471a16e4f9646bc3e8e2de148e7d8d7b affected
5bbaf9d1fcb9be696ee9a61636ab6803556c70f2< a19fb3611e4c06624fc0f83ef19f4fb8d57d4751 affected
5bbaf9d1fcb9be696ee9a61636ab6803556c70f2< 08bd4c46d5e63b78e77f2605283874bbe868ab19 affected
5.8 affected
… +8 more rows
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I. Basic Information for CVE-2025-71102

Vulnerability Information
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Vulnerability Title
scs: fix a wrong parameter in __scs_magic
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
Vulnerability Title
Linux kernel 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于__scs_magic函数参数错误，可能导致不准确的堆栈使用报告或内核崩溃。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Linux Linux 5bbaf9d1fcb9be696ee9a61636ab6803556c70f2 ~ 1727e8bd69103a68963a5613a0ddb6d8d37df5d3 -
Linux Linux 5.8 -

II. Public POCs for CVE-2025-71102

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III. Intelligence Information for CVE-2025-71102

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Same Patch Batch · Linux · 2026-01-14 · 43 CVEs total

CVE-2025-71116 9.1 CRITICAL libceph: make decode_pool() more resilient against corrupted osdmaps
CVE-2025-71112 8.8 HIGH net: hns3: add VLAN id validation before using
CVE-2025-71130 7.8 HIGH drm/i915/gem: Zero-initialize the eb.vma array in i915_gem_do_execbuffer
CVE-2025-71120 7.5 HIGH SUNRPC: svcauth_gss: avoid NULL deref on zero length gss_token in gss_read_proxy_verf
CVE-2025-71126 7.5 HIGH mptcp: avoid deadlock on fallback while reinjecting
CVE-2025-71128 7.5 HIGH erspan: Initialize options_len before referencing options.
CVE-2025-71131 7.5 HIGH crypto: seqiv - Do not use req->iv after crypto_aead_encrypt
CVE-2025-71132 7.5 HIGH smc91x: fix broken irq-context in PREEMPT_RT
CVE-2025-71127 7.1 HIGH wifi: mac80211: Discard Beacon frames to non-broadcast address
CVE-2025-71136 7.1 HIGH media: adv7842: Avoid possible out-of-bounds array accesses in adv7842_cp_log_status()
CVE-2025-71109 7.1 HIGH MIPS: ftrace: Fix memory corruption when kernel is located beyond 32 bits
CVE-2025-71108 usb: typec: ucsi: Handle incorrect num_connectors capability
CVE-2025-71111 hwmon: (w83791d) Convert macros to functions to avoid TOCTOU
CVE-2025-71105 f2fs: use global inline_xattr_slab instead of per-sb slab cache
CVE-2025-71115 um: init cpu_tasks[] earlier
CVE-2025-71104 KVM: x86: Fix VM hard lockup after prolonged inactivity with periodic HV timer
CVE-2025-71117 block: Remove queue freezing from several sysfs store callbacks
CVE-2025-71118 ACPICA: Avoid walking the Namespace if start_node is NULL
CVE-2025-71103 drm/msm: adreno: fix deferencing ifpc_reglist when not declared
CVE-2025-71106 fs: PM: Fix reverse check in filesystems_freeze_callback()

Showing top 20 of 43 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2025-71102

Anonymous User
2026-01-15 06:08:19

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