CVE-2022-48822

Kernel memory corruption via FunctionFS epfile race

Published Jul 16, 2024 · Updated Aug 5, 2026

Use-after-free in Linux kernel FunctionFS allows local users to corrupt kernel memory through concurrent endpoint teardown. During ffs_func_eps_disable, ffs_epfile_release can destroy ffs->epfiles and its read buffer before the first path acquires the spinlock, leaving a stale epfile pointer that frees the buffer again. The race requires local access to an active FunctionFS gadget during composition switching; a successful trigger causes a kernel crash or altered kernel execution.

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 Linux kernel FunctionFS allows local users to corrupt kernel memory through concurrent endpoint teardown. During ffs_func_eps_disable, ffs_epfile_release can destroy ffs->epfiles and its read buffer before the first path acquires the spinlock, leaving a stale epfile pointer that frees the buffer again. The race requires local access to an active FunctionFS gadget during composition switching; a successful trigger causes a kernel crash or altered kernel execution.

The record

CVE
CVE-2022-48822
Published
Jul 16, 2024
Updated
Aug 5, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-416, 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=4.8.10 <4.9
  2. Affected versionversion=4.9
  3. Affected versionversion=5cd8f6788ff34999dbd4cbec81a6adfc215e1e60
  4. Affected versionversion=a9e6f83c2df199187a5248f824f31b6787ae23ae <0042178a69eb77a979e36a50dcce9794a3140ef8
  5. Affected versionversion=a9e6f83c2df199187a5248f824f31b6787ae23ae <32048f4be071f9a6966744243f1786f45bb22dc2
  6. Affected versionversion=a9e6f83c2df199187a5248f824f31b6787ae23ae <3e078b18753669615301d946297bafd69294ad2c
  7. Affected versionversion=a9e6f83c2df199187a5248f824f31b6787ae23ae <72a8aee863af099d4434314c4536d6c9a61dcf3c
  8. Affected versionversion=a9e6f83c2df199187a5248f824f31b6787ae23ae <c9fc422c9a43e3d58d246334a71f3390401781dc
  9. Affected versionversion=a9e6f83c2df199187a5248f824f31b6787ae23ae <cfe5f6fd335d882bcc829a1c8a7d462a455c626e
  10. Affected versionversion=a9e6f83c2df199187a5248f824f31b6787ae23ae <ebe2b1add1055b903e2acd86b290a85297edc0b3

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=4.8.10 <4.9; version=4.9; version=5cd8f6788ff34999dbd4cbec81a6adfc215e1e60; version=a9e6f83c2df199187a5248f824f31b6787ae23ae <0042178a69eb77a979e36a50dcce9794a3140ef8; version=a9e6f83c2df199187a5248f824f31b6787ae23ae <32048f4be071f9a6966744243f1786f45bb22dc2; version=a9e6f83c2df199187a5248f824f31b6787ae23ae <3e078b18753669615301d946297bafd69294ad2c; version=a9e6f83c2df199187a5248f824f31b6787ae23ae <72a8aee863af099d4434314c4536d6c9a61dcf3c; version=a9e6f83c2df199187a5248f824f31b6787ae23ae <c9fc422c9a43e3d58d246334a71f3390401781dc; version=a9e6f83c2df199187a5248f824f31b6787ae23ae <cfe5f6fd335d882bcc829a1c8a7d462a455c626e; version=a9e6f83c2df199187a5248f824f31b6787ae23ae <ebe2b1add1055b903e2acd86b290a85297edc0b3

Published CVSS scores

7.8kernel.orgCVSS: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 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-416Use After Free
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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