CVE-2022-48821

HIGH EPSS 18.7%
Published Jul 16, 20241y ago · Modified Jun 17, 20261w ago
7.8 CVSS 3.1
High
Find Similar
Published Jul 16, 2024 1y ago
Last Modified Jun 17, 2026 1w ago

Description

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.

CVSS Details

Base Score
7.8
Exploitability
1.8
Impact
5.9
Vector string
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Attack Vector Local
Attack Complexity Low
Privileges Required Low
User Interaction None
Scope Unchanged
Confidentiality High
Integrity High
Availability High

Threat Intelligence

EPSS Exploit Probability
18.7% percentile
Exploit & Patch Status
No Known Exploit
Patch Available

Weaknesses 1

CWE-416 Use After Free Memory Safety

Affected Products 7

VendorProductVersionRange
linuxlinux_kernel*≥5.1  –  <5.4.180
linuxlinux_kernel*≥5.5  –  <5.10.101
linuxlinux_kernel*≥5.11  –  <5.15.24
linuxlinux_kernel*≥5.16  –  <5.16.10
linuxlinux_kernel5.17any
linuxlinux_kernel5.17any
linuxlinux_kernel5.17any

References 5

  • git.kernel.org https://git.kernel.org/stable/c/46963e2e0629cb31c96b1d47ddd89dc3d8990b34
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/4e6fd2b5fcf8e7119305a6042bd92e7f2b9ed215
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/76f85c307ef9f10aa2cef1b1d5ee654c1f3345fc
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/a5ce7ee5fcc07583159f54ab4af5164de00148f5
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/e4382d0a39f9a1e260d62fdc079ddae5293c037d
    Patch

Remediation

  • git.kernel.org https://git.kernel.org/stable/c/46963e2e0629cb31c96b1d47ddd89dc3d8990b34
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/4e6fd2b5fcf8e7119305a6042bd92e7f2b9ed215
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/76f85c307ef9f10aa2cef1b1d5ee654c1f3345fc
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/a5ce7ee5fcc07583159f54ab4af5164de00148f5
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/e4382d0a39f9a1e260d62fdc079ddae5293c037d
    Patch