CVE-2022-49336

Local privilege escalation via double mapping removal

Published Feb 26, 2025 · Updated Aug 5, 2026

Use-after-free in the Linux kernel etnaviv driver allows local users to escalate privileges by racing mapping reaping against buffer closure. The etnaviv_iommu_unmap_gem path fails to stop after another thread reaps a mapping, causing repeated list removal and context reference release. Access to an etnaviv DRM render node is required; exploitation can disclose or overwrite kernel memory, hijack control flow, or panic the host.

CVSS severity7.8
High
EPSS probability0.28%
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 etnaviv driver allows local users to escalate privileges by racing mapping reaping against buffer closure. The etnaviv_iommu_unmap_gem path fails to stop after another thread reaps a mapping, causing repeated list removal and context reference release. Access to an etnaviv DRM render node is required; exploitation can disclose or overwrite kernel memory, hijack control flow, or panic the host.

The record

CVE
CVE-2022-49336
Published
Feb 26, 2025
Updated
Aug 5, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1068
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Feb 26, 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

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=4.5
  2. Affected versionversion=a8c21a5451d831e67b7a6fb910f9ca8bc7b43554 <03bd455a79f69d97fee3e3b212ab754442f10e5c
  3. Affected versionversion=a8c21a5451d831e67b7a6fb910f9ca8bc7b43554 <19323b3671a85788569d15685c8f83a05ec48cbb
  4. Affected versionversion=a8c21a5451d831e67b7a6fb910f9ca8bc7b43554 <436cff507f2a41230baacc3e2ef1d3b2d2653f40
  5. Affected versionversion=a8c21a5451d831e67b7a6fb910f9ca8bc7b43554 <461c0fdf9434188875da9f10cfc86065866bb797
  6. Affected versionversion=a8c21a5451d831e67b7a6fb910f9ca8bc7b43554 <64f4edec081cb7c97c5e928529d0e1b0dbbffb83
  7. Affected versionversion=a8c21a5451d831e67b7a6fb910f9ca8bc7b43554 <e168c25526cd0368af098095c2ded4a008007e1b

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=4.5; version=a8c21a5451d831e67b7a6fb910f9ca8bc7b43554 <03bd455a79f69d97fee3e3b212ab754442f10e5c; version=a8c21a5451d831e67b7a6fb910f9ca8bc7b43554 <19323b3671a85788569d15685c8f83a05ec48cbb; version=a8c21a5451d831e67b7a6fb910f9ca8bc7b43554 <436cff507f2a41230baacc3e2ef1d3b2d2653f40; version=a8c21a5451d831e67b7a6fb910f9ca8bc7b43554 <461c0fdf9434188875da9f10cfc86065866bb797; version=a8c21a5451d831e67b7a6fb910f9ca8bc7b43554 <64f4edec081cb7c97c5e928529d0e1b0dbbffb83; version=a8c21a5451d831e67b7a6fb910f9ca8bc7b43554 <e168c25526cd0368af098095c2ded4a008007e1b

Published CVSS scores

7.8kernel.orgCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
5.5NIST NVDCVSS: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

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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

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

See the directory against your own environment.

Your stack

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