CVE-2026-72474

Local denial of service via softirq memory unmapping

Published Aug 15, 2026 · Updated Aug 15, 2026

Denial of service in the Linux dma-axi-dmac driver allows local users to crash affected systems during DMA descriptor cleanup. The axi_dmac_free_desc() path calls dma_free_coherent() for remapped descriptor memory in softirq context, causing vunmap() to trigger a kernel BUG(). Reachability requires the Axi-DMAC IP on an architecture such as arm64 or MicroBlaze with DMA_DIRECT_REMAP and no usable direct DMA pool; the reported consequence is a system crash.

CVSS severity5.5
Medium
EPSS probability0.21%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Denial of service in the Linux dma-axi-dmac driver allows local users to crash affected systems during DMA descriptor cleanup. The axi_dmac_free_desc() path calls dma_free_coherent() for remapped descriptor memory in softirq context, causing vunmap() to trigger a kernel BUG(). Reachability requires the Axi-DMAC IP on an architecture such as arm64 or MicroBlaze with DMA_DIRECT_REMAP and no usable direct DMA pool; the reported consequence is a system crash.

The record

CVE
CVE-2026-72474
Published
Aug 15, 2026
Updated
Aug 15, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-663, T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 15, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 15, 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=3f8fd25936ee5f52596f10d420f650c5b5e3285f <65e82fa24965b2eb6ad9412f6c530ed9a50a625f
  2. Affected versionversion=3f8fd25936ee5f52596f10d420f650c5b5e3285f <9e942c8579130e62734c14338e9f451780669164
  3. Affected versionversion=3f8fd25936ee5f52596f10d420f650c5b5e3285f <a4f41ceecfe68e117bae9c76c5ebc5e2b353fa56
  4. Affected versionversion=3f8fd25936ee5f52596f10d420f650c5b5e3285f <c0e6bb2b0408fcac6382158ee2bd9fdc45eceee9
  5. Affected versionversion=6.8

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=3f8fd25936ee5f52596f10d420f650c5b5e3285f <65e82fa24965b2eb6ad9412f6c530ed9a50a625f; version=3f8fd25936ee5f52596f10d420f650c5b5e3285f <9e942c8579130e62734c14338e9f451780669164; version=3f8fd25936ee5f52596f10d420f650c5b5e3285f <a4f41ceecfe68e117bae9c76c5ebc5e2b353fa56; version=3f8fd25936ee5f52596f10d420f650c5b5e3285f <c0e6bb2b0408fcac6382158ee2bd9fdc45eceee9; version=6.8

Published CVSS scores

5.5Red HatCVSS: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

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-663Use of a Non-reentrant Function in a Concurrent Context
T1499Endpoint Denial of Service

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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