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CVE-2025-40201— kernel/sys.c: fix the racy usage of task_lock(tsk->group_leader) in sys_prlimit64() paths

EPSS 0.03% · P9
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I. Basic Information for CVE-2025-40201

Vulnerability Information
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Vulnerability Title
kernel/sys.c: fix the racy usage of task_lock(tsk->group_leader) in sys_prlimit64() paths
Source: NVD (National Vulnerability Database)
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: kernel/sys.c: fix the racy usage of task_lock(tsk->group_leader) in sys_prlimit64() paths The usage of task_lock(tsk->group_leader) in sys_prlimit64()->do_prlimit() path is very broken. sys_prlimit64() does get_task_struct(tsk) but this only protects task_struct itself. If tsk != current and tsk is not a leader, this process can exit/exec and task_lock(tsk->group_leader) may use the already freed task_struct. Another problem is that sys_prlimit64() can race with mt-exec which changes ->group_leader. In this case do_prlimit() may take the wrong lock, or (worse) ->group_leader may change between task_lock() and task_unlock(). Change sys_prlimit64() to take tasklist_lock when necessary. This is not nice, but I don't see a better fix for -stable.
Source: NVD (National Vulnerability Database)
CVSS Information
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Type
N/A
Source: NVD (National Vulnerability Database)
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，该漏洞源于任务锁竞争条件，可能导致进程管理错误。
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

VendorProductAffected VersionsCPESubscribe
LinuxLinux 18c91bb2d87268d23868bf13508f5bc9cf04e89a ~ 1bc0d9315ef5296abb2c9fd840336255850ded18 -
LinuxLinux 5.18 -

II. Public POCs for CVE-2025-40201

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III. Intelligence Information for CVE-2025-40201

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Same Patch Batch · Linux · 2025-11-12 · 96 CVEs total

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CVE-2025-40179ext4: verify orphan file size is not too big
CVE-2025-40180mailbox: zynqmp-ipi: Fix out-of-bounds access in mailbox cleanup loop
CVE-2025-40181x86/kvm: Force legacy PCI hole to UC when overriding MTRRs for TDX/SNP
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CVE-2025-40182crypto: skcipher - Fix reqsize handling

Showing top 20 of 96 CVEs. View all on vendor page → →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2025-40201

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