CVE-2022-1055

Local privilege escalation via stale replay pointers

Published Mar 29, 2022 · Updated Jul 29, 2026

Use-after-free in tc_new_tfilter in Linux Kernel allows local users to escalate privileges through crafted traffic-control operations. When tc_new_tfilter jumps to its replay label, it retains q and chain pointers that can reference freed objects instead of clearing them before reuse. Exploitation requires local low-privileged access and enabled unprivileged user namespaces; successful memory corruption grants elevated kernel privileges.

CVSS severity8.6
High
EPSS probability0.50%
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 tc_new_tfilter in Linux Kernel allows local users to escalate privileges through crafted traffic-control operations. When tc_new_tfilter jumps to its replay label, it retains q and chain pointers that can reference freed objects instead of clearing them before reuse. Exploitation requires local low-privileged access and enabled unprivileged user namespaces; successful memory corruption grants elevated kernel privileges.

The record

CVE
CVE-2022-1055
Published
Mar 29, 2022
Updated
Jul 29, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
CWE-416, T1068
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Mar 29, 2022CVE publishedPublication date reported by the CVE source.
  2. Jul 29, 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=0 <5.17_rc3
  2. Affected versionversion=5.1.0 <5.4.177
  3. Affected versionversion=5.11.0 <5.15.20
  4. Affected versionversion=5.16.0 <5.16.6
  5. Affected versionversion=5.5.0 <5.10.97

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=0 <5.17_rc3; version=5.1.0 <5.4.177; version=5.11.0 <5.15.20; version=5.16.0 <5.16.6; version=5.5.0 <5.10.97

Published CVSS scores

8.6Google Inc.CVSS:4.0/AV:L/AC:H/AT:N/PR:L/UI:N/VC:H/VI:H/VA:N/SC:H/SI:H/SA:N

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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

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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