CVE-2022-49307

Kernel fault via unchecked netdev cleanup

Published Feb 26, 2025 · Updated May 11, 2026

A null-pointer dereference in the Linux synclink_gt driver allows local users to trigger a kernel fault during module cleanup. If alloc_hdlcdev() fails, slgt_cleanup() passes a null info->netdev pointer to unregister_hdlc_device() instead of checking it first. Reaching the cleanup path requires permission to remove the synclink_gt kernel module, and the reported consequence is a general protection fault.

CVSS severity5.5
Medium
EPSS probability0.29%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

A null-pointer dereference in the Linux synclink_gt driver allows local users to trigger a kernel fault during module cleanup. If alloc_hdlcdev() fails, slgt_cleanup() passes a null info->netdev pointer to unregister_hdlc_device() instead of checking it first. Reaching the cleanup path requires permission to remove the synclink_gt kernel module, and the reported consequence is a general protection fault.

The record

CVE
CVE-2022-49307
Published
Feb 26, 2025
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-476, T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Feb 26, 2025CVE publishedPublication date reported by the CVE source.
  2. May 11, 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=2.6.16
  2. Affected versionversion=705b6c7b34f2621f95f606d0e683daa10cdb8eb9 <078212ad15dbd88840c82c97f12c93d83703c8fd
  3. Affected versionversion=705b6c7b34f2621f95f606d0e683daa10cdb8eb9 <1ceb4ca9543a8a788febf6bc8dad2e605e172d5e
  4. Affected versionversion=705b6c7b34f2621f95f606d0e683daa10cdb8eb9 <50c341f9a2adc4c32a8ad5a39eb99d9c4a419e0d
  5. Affected versionversion=705b6c7b34f2621f95f606d0e683daa10cdb8eb9 <689ca31c542687709ba21ec2195c1fbce34fd029
  6. Affected versionversion=705b6c7b34f2621f95f606d0e683daa10cdb8eb9 <8a95696bdc0e13f8980f05b54a3b9081963d1256
  7. Affected versionversion=705b6c7b34f2621f95f606d0e683daa10cdb8eb9 <ba08cbc5b53e151d0acf1930fb526fc65b7f3e65
  8. Affected versionversion=705b6c7b34f2621f95f606d0e683daa10cdb8eb9 <d68d5e68b7f64de7170f8e04dd9b995c36b2c71c
  9. Affected versionversion=705b6c7b34f2621f95f606d0e683daa10cdb8eb9 <ddd67751ab86c6a65f95c35293c42f85a42ac05d
  10. Affected versionversion=705b6c7b34f2621f95f606d0e683daa10cdb8eb9 <f6e07eb7ebec53ffe81fc2489589320fbe4a6b75

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=2.6.16; version=705b6c7b34f2621f95f606d0e683daa10cdb8eb9 <078212ad15dbd88840c82c97f12c93d83703c8fd; version=705b6c7b34f2621f95f606d0e683daa10cdb8eb9 <1ceb4ca9543a8a788febf6bc8dad2e605e172d5e; version=705b6c7b34f2621f95f606d0e683daa10cdb8eb9 <50c341f9a2adc4c32a8ad5a39eb99d9c4a419e0d; version=705b6c7b34f2621f95f606d0e683daa10cdb8eb9 <689ca31c542687709ba21ec2195c1fbce34fd029; version=705b6c7b34f2621f95f606d0e683daa10cdb8eb9 <8a95696bdc0e13f8980f05b54a3b9081963d1256; version=705b6c7b34f2621f95f606d0e683daa10cdb8eb9 <ba08cbc5b53e151d0acf1930fb526fc65b7f3e65; version=705b6c7b34f2621f95f606d0e683daa10cdb8eb9 <d68d5e68b7f64de7170f8e04dd9b995c36b2c71c; version=705b6c7b34f2621f95f606d0e683daa10cdb8eb9 <ddd67751ab86c6a65f95c35293c42f85a42ac05d; version=705b6c7b34f2621f95f606d0e683daa10cdb8eb9 <f6e07eb7ebec53ffe81fc2489589320fbe4a6b75

Published CVSS scores

5.5CISA ADPCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/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

CWE-476NULL Pointer Dereference
T1499.004Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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