CVE-2022-48858

Local use-after-free via command-flush race

Published Jul 16, 2024 · Updated Aug 5, 2026

A race condition in the Linux kernel's mlx5 driver allows local users to trigger a command-entry use-after-free during command flushing. The flush path can acquire a reference after another process drops the entry's last reference but before its index is released because the operations lack a shared spin lock. Reachability requires the mlx5 driver and concurrent command release and firmware-fatal flushing; the documented result is a refcount warning and use-after-free.

CVSS severity7.0
High
EPSS probability0.18%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

A race condition in the Linux kernel's mlx5 driver allows local users to trigger a command-entry use-after-free during command flushing. The flush path can acquire a reference after another process drops the entry's last reference but before its index is released because the operations lack a shared spin lock. Reachability requires the mlx5 driver and concurrent command release and firmware-fatal flushing; the documented result is a refcount warning and use-after-free.

The record

CVE
CVE-2022-48858
Published
Jul 16, 2024
Updated
Aug 5, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-362, CWE-416
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Jul 16, 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=073fff8102062cd675170ceb54d90da22fe7e668 <1a4017926eeea56c7540cc41b42106746ee8a0ee
  2. Affected versionversion=50b2412b7e7862c5af0cbf4b10d93bc5c712d021 <0401bfb27a91d7bdd74b1635c1aae57cbb128da6
  3. Affected versionversion=50b2412b7e7862c5af0cbf4b10d93bc5c712d021 <063bd355595428750803d8736a9bb7c8db67d42d
  4. Affected versionversion=50b2412b7e7862c5af0cbf4b10d93bc5c712d021 <7c519f769f555ff7d9d4ccba3497bbb589df360a
  5. Affected versionversion=50b2412b7e7862c5af0cbf4b10d93bc5c712d021 <f3331bc17449f15832c31823f27573f4c0e13e5f
  6. Affected versionversion=5.4.71 <5.4.185
  7. Affected versionversion=5.8.15 <5.9
  8. Affected versionversion=5.9
  9. Affected versionversion=da87ea137373689dec9d3fafa34a57787320a4b3

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=073fff8102062cd675170ceb54d90da22fe7e668 <1a4017926eeea56c7540cc41b42106746ee8a0ee; version=50b2412b7e7862c5af0cbf4b10d93bc5c712d021 <0401bfb27a91d7bdd74b1635c1aae57cbb128da6; version=50b2412b7e7862c5af0cbf4b10d93bc5c712d021 <063bd355595428750803d8736a9bb7c8db67d42d; version=50b2412b7e7862c5af0cbf4b10d93bc5c712d021 <7c519f769f555ff7d9d4ccba3497bbb589df360a; version=50b2412b7e7862c5af0cbf4b10d93bc5c712d021 <f3331bc17449f15832c31823f27573f4c0e13e5f; version=5.4.71 <5.4.185; version=5.8.15 <5.9; version=5.9; version=da87ea137373689dec9d3fafa34a57787320a4b3

Published CVSS scores

7.0NIST NVDCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
7.0Amazon LinuxCVSS:3.1/AV:L/AC:H/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 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-362Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')
CWE-416Use After Free

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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