CVE-2022-50650

Kernel privilege escalation via callback reference undertracking

Published Dec 9, 2025 · Updated Aug 5, 2026

Use-after-free in the Linux kernel BPF verifier allows local users to gain kernel privileges through a crafted eBPF program. The verifier models each synchronous for-each callback once, so it undertracks caller references that runtime iterations release repeatedly, causing refcount underflow and use-after-free. Loading the program requires CAP_BPF or equivalent rights; successful exploitation enables kernel memory disclosure, arbitrary writes, control-flow hijacking, or a kernel panic.

CVSS severity7.8
High
EPSS probability0.16%
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 the Linux kernel BPF verifier allows local users to gain kernel privileges through a crafted eBPF program. The verifier models each synchronous for-each callback once, so it undertracks caller references that runtime iterations release repeatedly, causing refcount underflow and use-after-free. Loading the program requires CAP_BPF or equivalent rights; successful exploitation enables kernel memory disclosure, arbitrary writes, control-flow hijacking, or a kernel panic.

The record

CVE
CVE-2022-50650
Published
Dec 9, 2025
Updated
Aug 5, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1068
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Dec 9, 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=5.13
  2. Affected versionversion=69c087ba6225b574afb6e505b72cb75242a3d844 <4ed5155043c97ac8912bcf67331df87c833fb067
  3. Affected versionversion=69c087ba6225b574afb6e505b72cb75242a3d844 <9d9d00ac29d0ef7ce426964de46fa6b380357d0a
  4. Affected versionversion=69c087ba6225b574afb6e505b72cb75242a3d844 <aed931fd3b6e28f19cc140ff90aa5046ee2aa4e1
  5. Affected versionversion=69c087ba6225b574afb6e505b72cb75242a3d844 <caa176c0953cdfd5ce500fb517ce1ea924a8bc4c

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=5.13; version=69c087ba6225b574afb6e505b72cb75242a3d844 <4ed5155043c97ac8912bcf67331df87c833fb067; version=69c087ba6225b574afb6e505b72cb75242a3d844 <9d9d00ac29d0ef7ce426964de46fa6b380357d0a; version=69c087ba6225b574afb6e505b72cb75242a3d844 <aed931fd3b6e28f19cc140ff90aa5046ee2aa4e1; version=69c087ba6225b574afb6e505b72cb75242a3d844 <caa176c0953cdfd5ce500fb517ce1ea924a8bc4c

Published CVSS scores

5.5Amazon LinuxCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
7.8CanonicalCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
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.

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

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

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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