Linux Kernel up to 7.0.11 pch_uart dma_handle_rx null pointer dereference

CVSS Meta Temp Score
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CTI Interest Score
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9.5$0-$5k0.00

Summaryinfo

A vulnerability classified as very critical was found in Linux Kernel up to 7.0.11. Impacted is the function dma_handle_rx of the component pch_uart. Such manipulation leads to null pointer dereference. This vulnerability is referenced as CVE-2026-64234. It is possible to launch the attack remotely. No exploit is available. Upgrading the affected component is advised.

Detailsinfo

A vulnerability, which was classified as very critical, has been found in Linux Kernel up to 7.0.11. Affected by this issue is the function dma_handle_rx of the component pch_uart. The manipulation with an unknown input leads to a null pointer dereference vulnerability. Using CWE to declare the problem leads to CWE-476. A NULL pointer dereference occurs when the application dereferences a pointer that it expects to be valid, but is NULL, typically causing a crash or exit. Impacted is confidentiality, integrity, and availability. CVE summarizes:

In the Linux kernel, the following vulnerability has been resolved: tty: serial: pch_uart: add check for dma_alloc_coherent() Add a check for dma_alloc_coherent() failure to prevent a potential NULL pointer dereference in dma_handle_rx(). Properly release DMA channels and the PCI device reference using a goto ladder if the allocation fails.

The advisory is available at git.kernel.org. This vulnerability is handled as CVE-2026-64234 since 07/19/2026. The exploitation is known to be easy. The attack may be launched remotely. Technical details are known, but there is no available exploit. The structure of the vulnerability defines a possible price range of USD $0-$5k at the moment (estimation calculated on 08/30/2026).

Upgrading to version 5.10.259, 5.15.210, 6.1.176, 6.6.143, 6.12.93, 6.18.35 or 7.0.12 eliminates this vulnerability. Applying the patch 760df81763b391bb5f0dcb0b7597b736da753ae4/5f2e2a240dc1846e049bc67e9c3cdf5b031d08bf/daea997bb244aeb50cbb2e5e075fb446a6cf068f/6dd5c0ea139b586ad5a091677056dafd405cfe82/d846df2dfbc2469a688833b4cc4f8aa80672bde8/66f8bfea055b23719b4fd6ce207c44de37d82a59/d8d53a343ebe74274ca17b1e1993042e99f8c863/6fe472c1bbbe238e91141f7cabc1226e96a60d43 is able to eliminate this problem. The best possible mitigation is suggested to be upgrading to the latest version.

The vulnerability is also documented in the vulnerability database at CERT Bund (WID-SEC-2026-2527). If you want to get best quality of vulnerability data, you may have to visit VulDB.

Affected

  • Debian Linux
  • Amazon Linux 2
  • Red Hat Enterprise Linux
  • Red Hat OpenShift
  • RESF Rocky Linux
  • SUSE Linux
  • Ubuntu Linux
  • Oracle Linux
  • Open Source Linux Kernel

Productinfo

Type

Vendor

Name

Version

License

Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 9.9
VulDB Meta Temp Score: 9.5

VulDB Base Score: 9.9
VulDB Temp Score: 9.5
VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv2info

AVACAuCIA
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💳💳💳💳💳💳
💳💳💳💳💳💳
VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Null pointer dereference
CWE: CWE-476 / CWE-404
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Status: Not defined

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

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Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: Kernel 5.10.259/5.15.210/6.1.176/6.6.143/6.12.93/6.18.35/7.0.12
Patch: 760df81763b391bb5f0dcb0b7597b736da753ae4/5f2e2a240dc1846e049bc67e9c3cdf5b031d08bf/daea997bb244aeb50cbb2e5e075fb446a6cf068f/6dd5c0ea139b586ad5a091677056dafd405cfe82/d846df2dfbc2469a688833b4cc4f8aa80672bde8/66f8bfea055b23719b4fd6ce207c44de37d82a59/d8d53a343ebe74274ca17b1e1993042e99f8c863/6fe472c1bbbe238e91141f7cabc1226e96a60d43

Timelineinfo

07/19/2026 CVE reserved
07/24/2026 +5 days Advisory disclosed
07/24/2026 +0 days VulDB entry created
08/30/2026 +37 days VulDB entry last update

Sourcesinfo

Vendor: kernel.org

Advisory: git.kernel.org
Status: Confirmed

CVE: CVE-2026-64234 (🔒)
GCVE (CVE): GCVE-0-2026-64234
GCVE (VulDB): GCVE-100-382970
CERT Bund: WID-SEC-2026-2527 - Linux Kernel: Mehrere Schwachstellen

Entryinfo

Created: 07/24/2026 18:43
Updated: 08/30/2026 20:29
Changes: 07/24/2026 18:43 (59), 07/28/2026 03:50 (7), 07/29/2026 23:11 (1), 08/30/2026 20:29 (1)
Complete: 🔍
Cache ID: 216::103

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