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

2024-03-2909:13:45

Linux

www.cve.org

linux kernel

vulnerability

use-after-free

bug

worker

timer

mitigation

6.9 Medium

AI Score

Confidence

Low

0.0004 Low

EPSS

Percentile

9.1%

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.

CNA Affected

[
  {
    "product": "Linux",
    "vendor": "Linux",
    "defaultStatus": "unaffected",
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "programFiles": [
      "arch/sh/drivers/push-switch.c"
    ],
    "versions": [
      {
        "version": "9f5e8eee5cfe",
        "lessThan": "610dbd8ac271",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "9f5e8eee5cfe",
        "lessThan": "246f80a0b17f",
        "status": "affected",
        "versionType": "git"
      }
    ]
  },
  {
    "product": "Linux",
    "vendor": "Linux",
    "defaultStatus": "affected",
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "programFiles": [
      "arch/sh/drivers/push-switch.c"
    ],
    "versions": [
      {
        "version": "2.6.20",
        "status": "affected"
      },
      {
        "version": "0",
        "lessThan": "2.6.20",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "6.5.4",
        "lessThanOrEqual": "6.5.*",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "6.6",
        "lessThanOrEqual": "*",
        "status": "unaffected",
        "versionType": "original_commit_for_fix"
      }
    ]
  }
]