Description (CNA)
In the Linux kernel, the following vulnerability has been resolved: net: devmem: reject dma-buf bind with non-page-aligned size or SG length net_devmem_bind_dmabuf() trusts dmabuf->size and sg_dma_len() to be PAGE_SIZE multiples without checking: - tx_vec is sized dmabuf->size / PAGE_SIZE, and net_devmem_get_niov_at() only bounds-checks virt_addr < dmabuf->size before indexing tx_vec[virt_addr / PAGE_SIZE]. With size = N*PAGE_SIZE + r (1 <= r < PAGE_SIZE), sendmsg() at iov_base = N*PAGE_SIZE passes the bound check and reads tx_vec[N] -- one past. - owner->area.num_niovs = len / PAGE_SIZE while gen_pool_add_owner() covers the full byte len, so a non-page-multiple non-final sg desyncs num_niovs from the gen_pool region for every later sg, on both RX and TX. dma-buf does not require page-aligned sizes, so the bind path has to enforce what its own indexing assumes. Reject both with -EINVAL. The size check is TX-only (only tx_vec is sized off dmabuf->size); the SG-length check covers both directions.
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected bd61848900bff597764238f3a8ec67c815cd316e before 134c517dfa63203287b2aad6558017f42435a02e; affected bd61848900bff597764238f3a8ec67c815cd316e before d5008e4e4ee6b739256b796702a7d1aae1b5c3b4; affected bd61848900bff597764238f3a8ec67c815cd316e before 4eb82ba543421e9e38cc14e4e82058b78850df50 |
| Linux / Linux | affected 6.16; unaffected 0 before 6.16; unaffected 6.18.35 through 6.18.*; unaffected 7.0.11 through 7.0.*; unaffected 7.1 through * |
CWE
No CWE identifiers supplied.