CVE-2022-49775Public exploit

Local privilege escalation via CDG double-free

Published May 1, 2025 · Updated Aug 5, 2026

A double-free in the TCP CDG congestion-control code in Linux allows local users to corrupt kernel memory through an MPTCP socket. tcp_cdg_release() frees the CDG gradients allocation without clearing its pointer, so a later disconnect can release the same allocation again. Local access capable of creating an MPTCP socket and selecting CDG is required; exploitation can panic the kernel or enable arbitrary kernel code execution.

CVSS severity7.8
High
EPSS probability0.20%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

A double-free in the TCP CDG congestion-control code in Linux allows local users to corrupt kernel memory through an MPTCP socket. tcp_cdg_release() frees the CDG gradients allocation without clearing its pointer, so a later disconnect can release the same allocation again. Local access capable of creating an MPTCP socket and selecting CDG is required; exploitation can panic the kernel or enable arbitrary kernel code execution.

The record

CVE
CVE-2022-49775
Published
May 1, 2025
Updated
Aug 5, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-415, T1068
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. May 1, 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=2b0a8c9eee81882fc0001ccf6d9af62cdc682f9e <0b19171439016a8e4c97eafe543670ac86e2b8fe
  2. Affected versionversion=2b0a8c9eee81882fc0001ccf6d9af62cdc682f9e <1b639be27cbf428a5ca01dcf8b5d654194c956f8
  3. Affected versionversion=2b0a8c9eee81882fc0001ccf6d9af62cdc682f9e <35309be06b6feded2ab2cafbc2bca8534c2fa41e
  4. Affected versionversion=2b0a8c9eee81882fc0001ccf6d9af62cdc682f9e <4026033907cc6186d86b48daa4a252c860db2536
  5. Affected versionversion=2b0a8c9eee81882fc0001ccf6d9af62cdc682f9e <72e560cb8c6f80fc2b4afc5d3634a32465e13a51
  6. Affected versionversion=2b0a8c9eee81882fc0001ccf6d9af62cdc682f9e <78be2ee0112409ae4e9ee9e326151e0559b3d239
  7. Affected versionversion=2b0a8c9eee81882fc0001ccf6d9af62cdc682f9e <9e481d87349d2282f400ee1d010a169c99f766b8
  8. Affected versionversion=2b0a8c9eee81882fc0001ccf6d9af62cdc682f9e <b49026d9c86f35a4c5bfb8d7345c9c4379828c6b
  9. Affected versionversion=4.2

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=2b0a8c9eee81882fc0001ccf6d9af62cdc682f9e <0b19171439016a8e4c97eafe543670ac86e2b8fe; version=2b0a8c9eee81882fc0001ccf6d9af62cdc682f9e <1b639be27cbf428a5ca01dcf8b5d654194c956f8; version=2b0a8c9eee81882fc0001ccf6d9af62cdc682f9e <35309be06b6feded2ab2cafbc2bca8534c2fa41e; version=2b0a8c9eee81882fc0001ccf6d9af62cdc682f9e <4026033907cc6186d86b48daa4a252c860db2536; version=2b0a8c9eee81882fc0001ccf6d9af62cdc682f9e <72e560cb8c6f80fc2b4afc5d3634a32465e13a51; version=2b0a8c9eee81882fc0001ccf6d9af62cdc682f9e <78be2ee0112409ae4e9ee9e326151e0559b3d239; version=2b0a8c9eee81882fc0001ccf6d9af62cdc682f9e <9e481d87349d2282f400ee1d010a169c99f766b8; version=2b0a8c9eee81882fc0001ccf6d9af62cdc682f9e <b49026d9c86f35a4c5bfb8d7345c9c4379828c6b; version=4.2

Published CVSS scores

7.8Linux kernel CVE teamCVSS: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 exploitPublished

Weakness, pattern, technique

CWE-415Double Free
T1068Exploitation for Privilege Escalation

Public exploit references

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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