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.
OS | Version | Architecture | Package | Version | Filename |
---|---|---|---|---|---|
ubuntu | 20.04 | noarch | linux | < any | UNKNOWN |
ubuntu | 22.04 | noarch | linux | < any | UNKNOWN |
ubuntu | 20.04 | noarch | linux-aws | < any | UNKNOWN |
ubuntu | 22.04 | noarch | linux-aws | < any | UNKNOWN |
ubuntu | 20.04 | noarch | linux-aws-5.15 | < any | UNKNOWN |
ubuntu | 22.04 | noarch | linux-aws-6.5 | < any | UNKNOWN |
ubuntu | 20.04 | noarch | linux-azure | < any | UNKNOWN |
ubuntu | 22.04 | noarch | linux-azure | < any | UNKNOWN |
ubuntu | 20.04 | noarch | linux-azure-5.15 | < any | UNKNOWN |
ubuntu | 22.04 | noarch | linux-azure-6.5 | < any | UNKNOWN |
git.kernel.org/linus/246f80a0b17f8f582b2c0996db02998239057c65 (6.6-rc1)
git.kernel.org/stable/c/246f80a0b17f8f582b2c0996db02998239057c65
git.kernel.org/stable/c/610dbd8ac271aa36080aac50b928d700ee3fe4de
launchpad.net/bugs/cve/CVE-2023-52629
nvd.nist.gov/vuln/detail/CVE-2023-52629
security-tracker.debian.org/tracker/CVE-2023-52629
www.cve.org/CVERecord?id=CVE-2023-52629