Description
In the Linux kernel, the following vulnerability has been resolved:
udmabuf: validate ubuf->pagecount
Syzbot has reported GPF in sg_alloc_append_table_from_pages(). The problem was in ubuf->pages == ZERO_PTR.
ubuf->pagecount is calculated from arguments passed from user-space. If user creates udmabuf with list.size == 0 then ubuf->pagecount will be also equal to zero; it causes kmalloc_array() to return ZERO_PTR.
Fix it by validating ubuf->pagecount before passing it to kmalloc_array().
Metrics
CVSS 3.1 5.5/10
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:HAffected software
| Vendor | Product | Versions |
|---|---|---|
| Linux | Linux | >= fbb0de795078190a9834b3409e4b009cfb18a6d4, < 5d50f851dd307c07ca5591297093f19967c834a9; >= fbb0de795078190a9834b3409e4b009cfb18a6d4, < b267a8118c2b171bf7d67b90ed64154eeab9fae0; >= fbb0de795078190a9834b3409e4b009cfb18a6d4, < 811b667cefbea9cb7511a874b169d6a92907137e; >= fbb0de795078190a9834b3409e4b009cfb18a6d4, < a3728d32fc61eb0fe283cb8ff60b2c8f751e2202; >= fbb0de795078190a9834b3409e4b009cfb18a6d4, < 9e9b4a269f84d3230f2af84ff42322db676440d9; >= fbb0de795078190a9834b3409e4b009cfb18a6d4, < 2b6dd600dd72573c23ea180b5b0b2f1813405882 |
| Linux | Linux | 4.20 |
References
- https://git.kernel.org/stable/c/2b6dd600dd72573c23ea180b5b0b2f1813405882Patch
- https://git.kernel.org/stable/c/5d50f851dd307c07ca5591297093f19967c834a9Patch
- https://git.kernel.org/stable/c/811b667cefbea9cb7511a874b169d6a92907137ePatch
- https://git.kernel.org/stable/c/9e9b4a269f84d3230f2af84ff42322db676440d9Patch
- https://git.kernel.org/stable/c/a3728d32fc61eb0fe283cb8ff60b2c8f751e2202Patch
- https://git.kernel.org/stable/c/b267a8118c2b171bf7d67b90ed64154eeab9fae0Patch
Timeline
- Published
- Feb 26, 2025
- Last modified
- Jun 17, 2026
- NVD status
- Analyzed