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Review reviewHigh

CVE-2022-48821

Linux Linux, linux kernel

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 o...

CVSS
7.8
EPSS
0.27%
19.1% percentile
CISA KEV
Not listed
Published
2024.07.16
PRIORITY ASSESSMENT

Review review

The CVSS severity warrants an early asset and exposure review.

Known exploitationNot established by KEV
Exploit probability0.27%
Technical severityCVSS 7.8

Vulnerability overview

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 o...

Affected product and versions

Product
Linux Linux, linux kernel
Affected versions
>= 6cffd79504ce040f460831030d3069fa1c99bb71 < 4e6fd2b5fcf8e7119305a6042bd92e7f2b9ed215, >= 6cffd79504ce040f460831030d3069fa1c99bb71 < a5ce7ee5fcc07583159f54ab4af5164de00148f5, >= 6cffd79504ce040f460831030d3069fa1c99bb71 < e4382d0a39f9a1e260d62fdc079ddae5293c037d, >= 6cffd79504ce040f460831030d3069fa1c99bb71 < 76f85c307ef9f10aa2cef1b1d5ee654c1f3345fc, >= 6cffd79504ce040f460831030d3069fa1c99bb71 < 46963e2e0629cb31c96b1d47ddd89dc3d8990b34, >= 5.1, >= 5.1 < 5.4.180, >= 5.5 < 5.10.101, >= 5.11 < 5.15.24, >= 5.16 < 5.16.10, 5.17
Fixed versions
5.4.180, 5.10.101, 5.15.24, 5.16.10

Recommended response sequence

Confirm exposure before applying a vendor-supported change.

Full remediation guide
  1. 1
    Identify

    Confirm that Linux Linux, linux kernel and an affected version are present.

  2. 2
    Prioritize

    Combine exploitation signals with asset exposure and business criticality.

  3. 3
    Remediate

    Follow the vendor advisory or supported update path and preserve rollback options.

  4. 4
    Verify

    Recheck the version, service health, access paths, and relevant logs.

Technical data

CVSS vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CWE
CWE-416
CVE-2022-48821 — Linux Linux, linux kernel | SECUFOCUS NOW