Description (CNA)
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) * stack corruption here * 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.
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected 11a347fb6cef62ce47e84b97c45f2b2497c7593b before 49b0a6ab8e528a0c1c50e37cef9b9c7c121365f2; affected 11a347fb6cef62ce47e84b97c45f2b2497c7593b before f7447286363dc1e410bf30b87d75168f3519f9cc; affected 11a347fb6cef62ce47e84b97c45f2b2497c7593b before f807a6bf2005740fa26b4f59c4a003dc966b9afd; affected 11a347fb6cef62ce47e84b97c45f2b2497c7593b before 1bb7ff4204b6d4927e982cd256286c09ed4fd8ca |
| Linux / Linux | affected 6.8; unaffected 0 before 6.8; unaffected 6.12.23 through 6.12.*; unaffected 6.13.11 through 6.13.*; unaffected 6.14.2 through 6.14.*; unaffected 6.15 through * |
CWE
No CWE identifiers supplied.
References
- https://git.kernel.org/stable/c/49b0a6ab8e528a0c1c50e37cef9b9c7c121365f2
- https://git.kernel.org/stable/c/f7447286363dc1e410bf30b87d75168f3519f9cc
- https://git.kernel.org/stable/c/f807a6bf2005740fa26b4f59c4a003dc966b9afd
- https://git.kernel.org/stable/c/1bb7ff4204b6d4927e982cd256286c09ed4fd8ca
ADP enrichment
No English description supplied.
No references supplied.