CVE-2022-49755

Kernel memory corruption via FunctionFS use-after-free

Published Mar 27, 2025 · Updated Aug 5, 2026

Use-after-free in Linux kernel FunctionFS 2.6.35 through 6.1.8 allows local users to corrupt kernel memory during a fast composition switch. ffs_ep0_queue_wait retains ep0req while functionfs_unbind can free it and set it to NULL without serialization, so a concurrent endpoint-zero read or write dereferences freed memory. Exploitation requires local low-privileged access and a FunctionFS gadget undergoing a rapid composition change, with resulting compromise of kernel confidentiality, integrity, and availability.

CVSS severity7.8
High
EPSS probability0.23%
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 2.6.35 through 6.1.8 allows local users to corrupt kernel memory during a fast composition switch. ffs_ep0_queue_wait retains ep0req while functionfs_unbind can free it and set it to NULL without serialization, so a concurrent endpoint-zero read or write dereferences freed memory. Exploitation requires local low-privileged access and a FunctionFS gadget undergoing a rapid composition change, with resulting compromise of kernel confidentiality, integrity, and availability.

The record

CVE
CVE-2022-49755
Published
Mar 27, 2025
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. Mar 27, 2025CVE 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=2.6.35
  2. Affected versionversion=ddf8abd2599491cbad959c700b90ba72a5dce8d0 <6a19da111057f69214b97c62fb0ac59023970850
  3. Affected versionversion=ddf8abd2599491cbad959c700b90ba72a5dce8d0 <6aee197b7fbcd61596a78b47d553f2f99111f217
  4. Affected versionversion=ddf8abd2599491cbad959c700b90ba72a5dce8d0 <6dd9ea05534f323668db94fcc2726c7a84547e78
  5. Affected versionversion=ddf8abd2599491cbad959c700b90ba72a5dce8d0 <a8d40942df074f4ebcb9bd3413596d92f323b064
  6. Affected versionversion=ddf8abd2599491cbad959c700b90ba72a5dce8d0 <ae8e136bcaae96163b5821984de1036efc9abb1a
  7. Affected versionversion=ddf8abd2599491cbad959c700b90ba72a5dce8d0 <e9036e951f93fb8d7b5e9d6e2c7f94a4da312ae4
  8. Affected versionversion=ddf8abd2599491cbad959c700b90ba72a5dce8d0 <facf353c9e8d7885b686d9a4b173d4e0af6441d2

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=2.6.35; version=ddf8abd2599491cbad959c700b90ba72a5dce8d0 <6a19da111057f69214b97c62fb0ac59023970850; version=ddf8abd2599491cbad959c700b90ba72a5dce8d0 <6aee197b7fbcd61596a78b47d553f2f99111f217; version=ddf8abd2599491cbad959c700b90ba72a5dce8d0 <6dd9ea05534f323668db94fcc2726c7a84547e78; version=ddf8abd2599491cbad959c700b90ba72a5dce8d0 <a8d40942df074f4ebcb9bd3413596d92f323b064; version=ddf8abd2599491cbad959c700b90ba72a5dce8d0 <ae8e136bcaae96163b5821984de1036efc9abb1a; version=ddf8abd2599491cbad959c700b90ba72a5dce8d0 <e9036e951f93fb8d7b5e9d6e2c7f94a4da312ae4; version=ddf8abd2599491cbad959c700b90ba72a5dce8d0 <facf353c9e8d7885b686d9a4b173d4e0af6441d2

Published CVSS scores

7.8CISA ADP VulnrichmentCVSS: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

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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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