udmabuf: validate ubuf->pagecount
3Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackepss 0.2%
exploitation probability
0.2%top 86% of all CVEs
observed exploitation
nono source reports it
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().
Affected products
Linux · LinuxReferences
https://git.kernel.org/stable/c/2b6dd600dd72573c23ea180b5b0b2f1813405882https://git.kernel.org/stable/c/5d50f851dd307c07ca5591297093f19967c834a9https://git.kernel.org/stable/c/811b667cefbea9cb7511a874b169d6a92907137ehttps://git.kernel.org/stable/c/9e9b4a269f84d3230f2af84ff42322db676440d9https://git.kernel.org/stable/c/a3728d32fc61eb0fe283cb8ff60b2c8f751e2202https://git.kernel.org/stable/c/b267a8118c2b171bf7d67b90ed64154eeab9fae0