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CVE-2023-52629— sh: push-switch: Reorder cleanup operations to avoid use-after-free bug

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，该漏洞源于内存释放后重用。

AI Predicted 6.5 Difficulty: Hard EPSS 0.25% · P16

Possible ATT&CK Techniques 1 AI

T1068 · Exploitation for Privilege Escalation

Affected Version Matrix 8

VendorProduct Version RangeStatus
Linux Linux 9f5e8eee5cfe1328660c71812d87c2a67bda389f< ff635d1f143b55fa005e9e43b16e6d8f677e90a5 affected
9f5e8eee5cfe1328660c71812d87c2a67bda389f< 610dbd8ac271aa36080aac50b928d700ee3fe4de affected
9f5e8eee5cfe1328660c71812d87c2a67bda389f< 246f80a0b17f8f582b2c0996db02998239057c65 affected
2.6.20 affected
< 2.6.20 unaffected
6.1.189≤ 6.1.* unaffected
6.5.4≤ 6.5.* unaffected
6.6≤ * unaffected
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I. Basic Information for CVE-2023-52629

Vulnerability Information
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Vulnerability Title
sh: push-switch: Reorder cleanup operations to avoid use-after-free bug
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: sh: push-switch: Reorder cleanup operations to avoid use-after-free bug The original code puts flush_work() before timer_shutdown_sync() in switch_drv_remove(). Although we use flush_work() to stop the worker, it could be rescheduled in switch_timer(). As a result, a use-after-free bug can occur. The details are shown below: (cpu 0) | (cpu 1) switch_drv_remove() | flush_work() | ... | switch_timer // timer | schedule_work(&psw->work) timer_shutdown_sync() | ... | switch_work_handler // worker kfree(psw) // free | | psw->state = 0 // use This patch puts timer_shutdown_sync() before flush_work() to mitigate the bugs. As a result, the worker and timer will be stopped safely before the deallocate operations.
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，该漏洞源于内存释放后重用。
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 9f5e8eee5cfe1328660c71812d87c2a67bda389f ~ ff635d1f143b55fa005e9e43b16e6d8f677e90a5 -
Linux Linux 2.6.20 -

II. Public POCs for CVE-2023-52629

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III. Intelligence Information for CVE-2023-52629

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Patches & Fixes for CVE-2023-52629 (1)

Other References for CVE-2023-52629 (2)

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2023-52629

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