CVE-2021-47649

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().

The following products are affected by CVE-2021-47649 vulnerability.

Here, you will find a curated list of external links that provide in-depth information to CVE-2021-47649.

URL	Resource
https://git.kernel.org/stable/c/2b6dd600dd72573c23ea180b5b0b2f1813405882
https://git.kernel.org/stable/c/5d50f851dd307c07ca5591297093f19967c834a9
https://git.kernel.org/stable/c/811b667cefbea9cb7511a874b169d6a92907137e
https://git.kernel.org/stable/c/9e9b4a269f84d3230f2af84ff42322db676440d9
https://git.kernel.org/stable/c/a3728d32fc61eb0fe283cb8ff60b2c8f751e2202
https://git.kernel.org/stable/c/b267a8118c2b171bf7d67b90ed64154eeab9fae0
https://lore.kernel.org/linux-cve-announce/2025022649-CVE-2021-47649-f358@gregkh/T
https://nvd.nist.gov/vuln/detail/CVE-2021-47649
https://www.cve.org/CVERecord?id=CVE-2021-47649