CVE-2022-48821: Linux Kernel

High severity, CVSS 7.8. EPSS: 0.3% chance of exploitation in the next 30 days.

In the Linux kernel, the following vulnerability has been resolved: misc: fastrpc: avoid double fput() on failed usercopy If the copy back to userland fails for the FASTRPC_IOCTL_ALLOC_DMA_BUFF ioctl(), we shouldn't assume that 'buf->dmabuf' is still valid. In fact, dma_buf_fd() called fd_install() before, i.e. "consumed" one reference, leaving us with none. Calling dma_buf_put() will therefore put a reference we no longer own, leading to a valid file descritor table entry for an already released 'file' object which is a straight use-after-free. Simply avoid calling dma_buf_put() and rely on the process exit code to do the necessary cleanup, if needed, i.e. if the file descriptor is still valid.

Affected products

• Linux Linux Kernel: from 5.1, before 5.4.180 (fixed in 5.4.180); from 5.5, before 5.10.101 (fixed in 5.10.101); from 5.11, before 5.15.24 (fixed in 5.15.24); from 5.16, before 5.16.10 (fixed in 5.16.10); version 5.17 only

Published 2024-07-16. Last modified 2026-08-04.