Total vulnerabilities in the database
In the Linux kernel, the following vulnerability has been resolved:
exfat: fix random stack corruption after get_block
When get_block is called with a buffer_head allocated on the stack, such as do_mpage_readpage, stack corruption due to buffer_head UAF may occur in the following race condition situation.
<CPU 0> <CPU 1>
mpage_read_folio <<bh on stack>> do_mpage_readpage exfat_get_block bh_read __bh_read get_bh(bh) submit_bh wait_on_buffer ... end_buffer_read_sync __end_buffer_read_notouch unlock_buffer <<keep going>> ... ... ... ... <<bh is not valid out of mpage_read_folio>> . . another_function <<variable A on stack>> put_bh(bh) atomic_dec(bh->b_count)
This patch returns -EAGAIN if a folio does not have buffers when bh_read needs to be called. By doing this, the caller can fallback to functions like block_read_full_folio(), create a buffer_head in the folio, and then call get_block again.
Let's do not call bh_read() with on-stack buffer_head.
| Software | From | Fixed in |
|---|---|---|
| linux / linux_kernel | 6.13 | 6.13.11 |
| linux / linux_kernel | 6.14 | 6.14.2 |
| linux / linux_kernel | 6.8 | 6.12.23 |