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CVE-2023-2235— Use-after-free in Linux kernel's Performance Events subsystem

Quick assessment

Affected
Linux Linux Kernel
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 Performance Events 系统存在释放后重用漏洞，可被利用实现本地提权。

CVSS 7.8 · High EPSS 0.25% · P17

Possible ATT&CK Techniques 1 AI

T1068 · Exploitation for Privilege Escalation

Affected Version Matrix 1

VendorProduct Version RangeStatus
Linux Linux Kernel 5.13< 6.3 affected
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I. Basic Information for CVE-2023-2235

Vulnerability Information
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Vulnerability Title
Use-after-free in Linux kernel's Performance Events subsystem
Source: CVE Program / CVE List V5
Vulnerability Description
A use-after-free vulnerability in the Linux Kernel Performance Events system can be exploited to achieve local privilege escalation. The perf_group_detach function did not check the event's siblings' attach_state before calling add_event_to_groups(), but remove_on_exec made it possible to call list_del_event() on before detaching from their group, making it possible to use a dangling pointer causing a use-after-free vulnerability. We recommend upgrading past commit fd0815f632c24878e325821943edccc7fde947a2.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
释放后使用
Source: CVE Program / CVE List V5
Vulnerability Title
Linux kernel 资源管理错误漏洞
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 Performance Events 系统存在释放后重用漏洞，可被利用实现本地提权。
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 Kernel 5.13 ~ 6.3 -

II. Public POCs for CVE-2023-2235

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III. Intelligence Information for CVE-2023-2235

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Patches & Fixes for CVE-2023-2235 (1)

Other References for CVE-2023-2235 (1)

IV. Related Vulnerabilities

Same product: Linux Kernel
Same vendor: Linux
Same weakness: CWE-416

V. Comments for CVE-2023-2235

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