CVE-2022-48726

Kernel crash via unlocked multicast traversal

Published Jun 20, 2024 · Updated Aug 5, 2026

Use-after-free in Linux kernel RDMA/ucma allows local users to crash the kernel through concurrent multicast leave and ID teardown. The ucma_destroy_private_ctx path scans multicast_table with xa_for_each without locking, so it reads a ucma_multicast object while another thread frees it. Reachability requires local access to the RDMA connection-manager device and concurrent operations on multicast contexts; the demonstrated consequence is a kernel crash.

CVSS severity7.8
High
EPSS probability0.24%
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 RDMA/ucma allows local users to crash the kernel through concurrent multicast leave and ID teardown. The ucma_destroy_private_ctx path scans multicast_table with xa_for_each without locking, so it reads a ucma_multicast object while another thread frees it. Reachability requires local access to the RDMA connection-manager device and concurrent operations on multicast contexts; the demonstrated consequence is a kernel crash.

The record

CVE
CVE-2022-48726
Published
Jun 20, 2024
Updated
Aug 5, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-416
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Jun 20, 2024CVE 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=5.10
  2. Affected versionversion=95fe51096b7adf1d1e7315c49c75e2f75f162584 <2923948ffe0835f7114e948b35bcc42bc9b3baa1
  3. Affected versionversion=95fe51096b7adf1d1e7315c49c75e2f75f162584 <36e8169ec973359f671f9ec7213547059cae972e
  4. Affected versionversion=95fe51096b7adf1d1e7315c49c75e2f75f162584 <75c610212b9f1756b9384911d3a2c347eee8031c
  5. Affected versionversion=95fe51096b7adf1d1e7315c49c75e2f75f162584 <ee2477e8ccd3d978eeac0dc5a981b286d9bb7b0a

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=5.10; version=95fe51096b7adf1d1e7315c49c75e2f75f162584 <2923948ffe0835f7114e948b35bcc42bc9b3baa1; version=95fe51096b7adf1d1e7315c49c75e2f75f162584 <36e8169ec973359f671f9ec7213547059cae972e; version=95fe51096b7adf1d1e7315c49c75e2f75f162584 <75c610212b9f1756b9384911d3a2c347eee8031c; version=95fe51096b7adf1d1e7315c49c75e2f75f162584 <ee2477e8ccd3d978eeac0dc5a981b286d9bb7b0a

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
7.8UbuntuCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
4.4NVDCVSS:3.1/AV:L/AC:L/PR:H/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 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

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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