Vulnerability 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().
CVSS Score
MEDIUM
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Linux | Linux Kernel | >= 4.20, < 5.4.189 |
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
FAQ
What is CVE-2021-47649?
CVE-2021-47649 is a vulnerability with a CVSS score of 5.5 (MEDIUM). 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 ==...
How severe is CVE-2021-47649?
CVE-2021-47649 has been rated MEDIUM with a CVSS base score of 5.5/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2021-47649?
Check the references section above for vendor advisories and patch information. Affected products include: Linux Linux Kernel.