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

2024-03-2909:13:45

Linux

github.com

linux kernel

vulnerability

use-after-free

AI Score

Confidence

Low

SSVC

Exploitation

none

Automatable

Technical Impact

total

JSON

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)

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.

ADP Affected

[
  {
    "cpes": [
      "cpe:2.3:o:linux:linux_kernel:-:*:*:*:*:*:*:*"
    ],
    "vendor": "linux",
    "product": "linux_kernel",
    "versions": [
      {
        "status": "affected",
        "version": "9f5e8eee5cfe",
        "lessThan": "610dbd8ac271",
        "versionType": "custom"
      },
      {
        "status": "affected",
        "version": "9f5e8eee5cfe",
        "lessThan": "246f80a0b17f",
        "versionType": "custom"
      },
      {
        "status": "affected",
        "version": "2.6.20"
      },
      {
        "status": "unaffected",
        "version": "0",
        "lessThan": "2.6.20",
        "versionType": "custom"
      },
      {
        "status": "unaffected",
        "version": "6.54",
        "versionType": "custom",
        "lessThanOrEqual": "6.6"
      },
      {
        "status": "unaffected",
        "version": "0",
        "versionType": "custom",
        "lessThanOrEqual": "6.6"
      }
    ],
    "defaultStatus": "unknown"
  }
]