CVE-2022-48821

2024-07-1612:15:06

Linux

web.nvd.nist.gov

linux kernel

fastrpc

usercopy vulnerability

AI Score

6.7

Confidence

Low

EPSS

Percentile

16.0%

JSON

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 configurations

Vulners

Node

linuxlinux_kernelRange5.1–5.4.180

linuxlinux_kernelRange5.5.0–5.10.101

linuxlinux_kernelRange5.11.0–5.15.24

linuxlinux_kernelRange5.16.0–5.16.10

linuxlinux_kernelRange5.17.0≥

VendorProductVersionCPE
linuxlinux_kernel*cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*

Vendor	Product	Version	CPE
linux	linux_kernel	*	cpe:2.3:o:linux:linux_kernel::::::::

CNA Affected

[
  {
    "product": "Linux",
    "vendor": "Linux",
    "defaultStatus": "unaffected",
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "programFiles": [
      "drivers/misc/fastrpc.c"
    ],
    "versions": [
      {
        "version": "6cffd79504ce",
        "lessThan": "4e6fd2b5fcf8",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "6cffd79504ce",
        "lessThan": "a5ce7ee5fcc0",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "6cffd79504ce",
        "lessThan": "e4382d0a39f9",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "6cffd79504ce",
        "lessThan": "76f85c307ef9",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "6cffd79504ce",
        "lessThan": "46963e2e0629",
        "status": "affected",
        "versionType": "git"
      }
    ]
  },
  {
    "product": "Linux",
    "vendor": "Linux",
    "defaultStatus": "affected",
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "programFiles": [
      "drivers/misc/fastrpc.c"
    ],
    "versions": [
      {
        "version": "5.1",
        "status": "affected"
      },
      {
        "version": "0",
        "lessThan": "5.1",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "5.4.180",
        "lessThanOrEqual": "5.4.*",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "5.10.101",
        "lessThanOrEqual": "5.10.*",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "5.15.24",
        "lessThanOrEqual": "5.15.*",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "5.16.10",
        "lessThanOrEqual": "5.16.*",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "5.17",
        "lessThanOrEqual": "*",
        "status": "unaffected",
        "versionType": "original_commit_for_fix"
      }
    ]
  }
]