CVE-2026-64234

Local kernel crash via unchecked DMA allocation

Published Jul 24, 2026 · Updated Jul 24, 2026

NULL pointer dereference in the Linux Kernel pch_uart driver allows local users to crash the kernel during receive DMA setup. The driver fails to check whether dma_alloc_coherent() returned NULL before dma_handle_rx() uses the receive buffer. Reachability requires local access, the EG20T PCH UART driver on compatible hardware, and a failed DMA allocation; only a kernel crash is documented.

CVSS severity5.5
Medium
EPSS probability0.11%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

NULL pointer dereference in the Linux Kernel pch_uart driver allows local users to crash the kernel during receive DMA setup. The driver fails to check whether dma_alloc_coherent() returned NULL before dma_handle_rx() uses the receive buffer. Reachability requires local access, the EG20T PCH UART driver on compatible hardware, and a failed DMA allocation; only a kernel crash is documented.

The record

CVE
CVE-2026-64234
Published
Jul 24, 2026
Updated
Jul 24, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
CWE-476, T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Jul 24, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 24, 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=2.6.38
  2. Affected versionversion=3c6a483275f47a2ef7119309ad3d791c10cf30da <5f2e2a240dc1846e049bc67e9c3cdf5b031d08bf
  3. Affected versionversion=3c6a483275f47a2ef7119309ad3d791c10cf30da <66f8bfea055b23719b4fd6ce207c44de37d82a59
  4. Affected versionversion=3c6a483275f47a2ef7119309ad3d791c10cf30da <6dd5c0ea139b586ad5a091677056dafd405cfe82
  5. Affected versionversion=3c6a483275f47a2ef7119309ad3d791c10cf30da <6fe472c1bbbe238e91141f7cabc1226e96a60d43
  6. Affected versionversion=3c6a483275f47a2ef7119309ad3d791c10cf30da <760df81763b391bb5f0dcb0b7597b736da753ae4
  7. Affected versionversion=3c6a483275f47a2ef7119309ad3d791c10cf30da <d846df2dfbc2469a688833b4cc4f8aa80672bde8
  8. Affected versionversion=3c6a483275f47a2ef7119309ad3d791c10cf30da <d8d53a343ebe74274ca17b1e1993042e99f8c863
  9. Affected versionversion=3c6a483275f47a2ef7119309ad3d791c10cf30da <daea997bb244aeb50cbb2e5e075fb446a6cf068f

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=2.6.38; version=3c6a483275f47a2ef7119309ad3d791c10cf30da <5f2e2a240dc1846e049bc67e9c3cdf5b031d08bf; version=3c6a483275f47a2ef7119309ad3d791c10cf30da <66f8bfea055b23719b4fd6ce207c44de37d82a59; version=3c6a483275f47a2ef7119309ad3d791c10cf30da <6dd5c0ea139b586ad5a091677056dafd405cfe82; version=3c6a483275f47a2ef7119309ad3d791c10cf30da <6fe472c1bbbe238e91141f7cabc1226e96a60d43; version=3c6a483275f47a2ef7119309ad3d791c10cf30da <760df81763b391bb5f0dcb0b7597b736da753ae4; version=3c6a483275f47a2ef7119309ad3d791c10cf30da <d846df2dfbc2469a688833b4cc4f8aa80672bde8; version=3c6a483275f47a2ef7119309ad3d791c10cf30da <d8d53a343ebe74274ca17b1e1993042e99f8c863; version=3c6a483275f47a2ef7119309ad3d791c10cf30da <daea997bb244aeb50cbb2e5e075fb446a6cf068f

Published CVSS scores

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

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-476NULL Pointer Dereference
T1499Endpoint Denial of Service

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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