CVE-2022-48821

Kernel-memory corruption via stale FastRPC descriptor

Published Jul 16, 2024 · Updated Aug 5, 2026

Use-after-free in FastRPC in affected Linux kernels allows local users to corrupt kernel memory or crash the system through a DMA-buffer ioctl. On a failed user-space copy for FASTRPC_IOCTL_ALLOC_DMA_BUFF, the error path calls dma_buf_put() after dma_buf_fd() consumed the reference. Local low-privilege access to the FastRPC device is required, with no network exposure or user interaction involved.

CVSS severity7.8
High
EPSS probability0.27%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Use-after-free in FastRPC in affected Linux kernels allows local users to corrupt kernel memory or crash the system through a DMA-buffer ioctl. On a failed user-space copy for FASTRPC_IOCTL_ALLOC_DMA_BUFF, the error path calls dma_buf_put() after dma_buf_fd() consumed the reference. Local low-privilege access to the FastRPC device is required, with no network exposure or user interaction involved.

The record

CVE
CVE-2022-48821
Published
Jul 16, 2024
Updated
Aug 5, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1068
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Jul 16, 2024CVE publishedPublication date reported by the CVE source.
  2. Aug 5, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=5.1
  2. Affected versionversion=6cffd79504ce040f460831030d3069fa1c99bb71 <46963e2e0629cb31c96b1d47ddd89dc3d8990b34
  3. Affected versionversion=6cffd79504ce040f460831030d3069fa1c99bb71 <4e6fd2b5fcf8e7119305a6042bd92e7f2b9ed215
  4. Affected versionversion=6cffd79504ce040f460831030d3069fa1c99bb71 <76f85c307ef9f10aa2cef1b1d5ee654c1f3345fc
  5. Affected versionversion=6cffd79504ce040f460831030d3069fa1c99bb71 <a5ce7ee5fcc07583159f54ab4af5164de00148f5
  6. Affected versionversion=6cffd79504ce040f460831030d3069fa1c99bb71 <e4382d0a39f9a1e260d62fdc079ddae5293c037d

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=5.1; version=6cffd79504ce040f460831030d3069fa1c99bb71 <46963e2e0629cb31c96b1d47ddd89dc3d8990b34; version=6cffd79504ce040f460831030d3069fa1c99bb71 <4e6fd2b5fcf8e7119305a6042bd92e7f2b9ed215; version=6cffd79504ce040f460831030d3069fa1c99bb71 <76f85c307ef9f10aa2cef1b1d5ee654c1f3345fc; version=6cffd79504ce040f460831030d3069fa1c99bb71 <a5ce7ee5fcc07583159f54ab4af5164de00148f5; version=6cffd79504ce040f460831030d3069fa1c99bb71 <e4382d0a39f9a1e260d62fdc079ddae5293c037d

Published CVSS scores

7.8UbuntuCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1068Exploitation for Privilege Escalation

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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