What is CVE-2022-48821?

CVE-2022-48821 is a High severity Linux kernel vulnerability with a CVSS score of 7.8 out of 10, classified as a Use After Free flaw (CWE-416), affecting Linux kernel versions from 5.1 onward and patched in 5.4.180, 5.10.101, 5.15.24 and others. CVE-2022-48821 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

What is the CVSS score for CVE-2022-48821?

CVE-2022-48821 has a CVSS score of 7.8 out of 10, rated High severity. The vector string is CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.

Is there a patch available for CVE-2022-48821?

Yes, CVE-2022-48821 has been patched. Fixed versions include 5.4.180, 5.10.101, 5.15.24 and others. If you are running Linux kernel 5.1 or later up to the fix versions, apply the relevant patch for your kernel branch.

Is CVE-2022-48821 actively exploited?

CVE-2022-48821 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

What is Use After Free (CWE-416)?

The product references memory after it has been freed, which may cause it to crash, use unexpected values, or execute code. See MITRE CWE for full details: https://cwe.mitre.org/data/definitions/416.html

CVE-2022-48821

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 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.

Package Linux Kernel

Published 2024-07-16

Last modified 2025-09-25

CVSS version 3.1

Patch available

Yes

CVSS 3.1 score

7.8

out of 10

High

Attack Vector

Local

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Vector string

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Weakness type

CWE-416

CVE-2022-48821 is a Use After Free vulnerability

What is Use After Free?

The product references memory after it has been freed, which may cause it to crash, use unexpected values, or execute code. Learn more on MITRE CWE

Affected versions

Linux kernel versions 5.1 and later are affected. Fixed in 5.4.180, 5.10.101, 5.15.24, 5.16.10, 5.17 and their respective stable series.

Affected from

≥ 5.1

Fixed in

✓ 5.4.180 5.4.x ✓ 5.10.101 5.10.x ✓ 5.15.24 5.15.x ✓ 5.16.10 5.16.x ✓ 5.17

References

5 total

Kernel Git
https://git.kernel.org/stable/c/46963e2e0629cb31c96b1d47ddd89dc3d8990b34

Patch
Kernel Git
https://git.kernel.org/stable/c/4e6fd2b5fcf8e7119305a6042bd92e7f2b9ed215

Patch
Kernel Git
https://git.kernel.org/stable/c/76f85c307ef9f10aa2cef1b1d5ee654c1f3345fc

Patch
Kernel Git
https://git.kernel.org/stable/c/a5ce7ee5fcc07583159f54ab4af5164de00148f5

Patch
Kernel Git
https://git.kernel.org/stable/c/e4382d0a39f9a1e260d62fdc079ddae5293c037d

Patch

Details

CVE ID CVE-2022-48821

Severity High

CVSS score 7.8 / 10

CVSS version 3.1

Published 2024-07-16

Modified 2025-09-25

KEV No

Patch

Yes

Package linux

Frequently asked questions

What is CVE-2022-48821?

CVE-2022-48821 is a High severity Linux kernel vulnerability with a CVSS score of 7.8 out of 10 , classified as an Use After Free flaw (CWE-416) . It affects Linux kernel versions from 5.1 onward and has been patched in 5.4.180, 5.10.101, 5.15.24 and others. CVE-2022-48821 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.
What is the CVSS score for CVE-2022-48821?

CVE-2022-48821 has a CVSS score of 7.8 out of 10, rated High severity (CVSS 3.1). The vector string is CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.
Is there a patch available for CVE-2022-48821?

Yes. CVE-2022-48821 has been patched. Fixed versions include 5.4.180, 5.10.101, 5.15.24 and others. If you are running Linux kernel 5.1 or later up to the fix versions, apply the relevant patch for your kernel branch.
Is CVE-2022-48821 actively exploited?

No. CVE-2022-48821 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.