CVE-2022-49500

Kernel panic via DMA into VMAP stacks

Published Feb 26, 2025 · Updated Aug 5, 2026

Improper DMA handling in Linux 5.18 through 5.18.2 allows physically proximate attackers to panic the kernel via wl1251 traffic. The wl1251 event, I/O, and transmit paths pass stack-backed buffers to DMA even though VMAP_STACK makes those addresses unsuitable for direct DMA mapping. The interface must use wl1251 hardware over SDIO or SPI with VMAP_STACK enabled; triggering the affected path interrupts the entire system.

CVSS severity9.8
Critical
EPSS probability0.27%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper DMA handling in Linux 5.18 through 5.18.2 allows physically proximate attackers to panic the kernel via wl1251 traffic. The wl1251 event, I/O, and transmit paths pass stack-backed buffers to DMA even though VMAP_STACK makes those addresses unsuitable for direct DMA mapping. The interface must use wl1251 hardware over SDIO or SPI with VMAP_STACK enabled; triggering the affected path interrupts the entire system.

The record

CVE
CVE-2022-49500
Published
Feb 26, 2025
Updated
Aug 5, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499.004
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

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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=5.18
  2. Affected versionversion=a1c510d0adc604bb143c86052bc5be48cbcfa17c <454744754cbf2c21b3fc7344e46e10bee2768094
  3. Affected versionversion=a1c510d0adc604bb143c86052bc5be48cbcfa17c <da03bbfbf5acd1ab0b074617e865ad1e8a5779ef

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=5.18; version=a1c510d0adc604bb143c86052bc5be48cbcfa17c <454744754cbf2c21b3fc7344e46e10bee2768094; version=a1c510d0adc604bb143c86052bc5be48cbcfa17c <da03bbfbf5acd1ab0b074617e865ad1e8a5779ef

Published CVSS scores

5.5NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
9.8LinuxCVSS:3.1/AV:A/AC:L/PR:N/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

T1499.004Application or System Exploitation

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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