High · published February 27, 2025
In the Linux kernel, the following vulnerability has been resolved:
padata: avoid UAF for reorder_work
Although the previous patch can avoid ps and ps UAF for _do_serial, it
can not avoid potential UAF issue for reorder_work. This issue can
happen just as below:
crypto_request crypto_request crypto_del_alg
padata_do_serial
...
padata_reorder
// processes all remaining
// requests then breaks
while (1) {
if (!padata)
break;
...
}
padata_do_serial
// new request added
list_add
// sees the new request
queue_work(reorder_work)
padata_reorder
queue_work_on(squeue->work)
...
<kworker context>
padata_serial_worker
// completes new request,
// no more outstanding
// requests
crypto_del_alg
// free pd
<kworker context>
invoke_padata_reorder
// UAF of pd
To avoid UAF for 'reorder_work', get 'pd' ref before put 'reorder_work'
into the 'serial_wq' and put 'pd' ref until the 'serial_wq' finish.
| Product | Versions | Fixed in |
|---|---|---|
| linux/linux_kernel | ≥ 5.4.19, < 5.5 | 5.5 |
| linux/linux_kernel | ≥ 5.5.3, < 5.10.235 | 5.10.235 |
| linux/linux_kernel | ≥ 5.11, < 5.15.79 | 5.15.79 |
| linux/linux_kernel | ≥ 5.16, < 6.1.129 | 6.1.129 |
| linux/linux_kernel | ≥ 6.2, < 6.6.76 | 6.6.76 |
| linux/linux_kernel | ≥ 6.7, < 6.12.13 | 6.12.13 |
| linux/linux_kernel | ≥ 6.13, < 6.13.2 | 6.13.2 |