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CVE-2022-48821

7.8 · HIGH

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 i…

Published Jul 16, 2024CWE-416EPSS 0.27%

Overview

CVE-2022-48821 is a high-severity vulnerability. It was published on July 16, 2024 and has a CVSS 3.1 base score of 7.8 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.8, rated HIGH. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

Technical 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.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Refgit.kernel.org/stable/c/46963e2e0629cb31c96b1d47ddd89dc3d8990b34Refgit.kernel.org/stable/c/4e6fd2b5fcf8e7119305a6042bd92e7f2b9ed215Refgit.kernel.org/stable/c/76f85c307ef9f10aa2cef1b1d5ee654c1f3345fcRefgit.kernel.org/stable/c/a5ce7ee5fcc07583159f54ab4af5164de00148f5Refgit.kernel.org/stable/c/e4382d0a39f9a1e260d62fdc079ddae5293c037dRefgit.kernel.org/stable/c/46963e2e0629cb31c96b1d47ddd89dc3d8990b34Refgit.kernel.org/stable/c/4e6fd2b5fcf8e7119305a6042bd92e7f2b9ed215Refgit.kernel.org/stable/c/76f85c307ef9f10aa2cef1b1d5ee654c1f3345fcRefgit.kernel.org/stable/c/a5ce7ee5fcc07583159f54ab4af5164de00148f5Refgit.kernel.org/stable/c/e4382d0a39f9a1e260d62fdc079ddae5293c037d

How CyberStrike helps

Frequently asked questions

What is CVE-2022-48821?

CVE-2022-48821 is a high-severity vulnerability. It was published on July 16, 2024 and has a CVSS 3.1 base score of 7.8 (HIGH).

How severe is CVE-2022-48821?

This vulnerability has a CVSS 3.1 base score of 7.8, rated HIGH. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2022-48821?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2022-48821?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2022-48821 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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