LinuxCVELIST:CVE-2023-52629CVE-2023-52629 sh: push-switch: Reorder cleanup operations to avoid use-after-free bug
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.
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"
}
]
}
]Related
