Linux Kernel up to 5.10.177/5.15.106/6.1.23/6.2.10 Vmbus Interrupt Service relid2channel null pointer dereference

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5.5$0-$5k0.00

Summaryinfo

A vulnerability labeled as critical has been found in Linux Kernel up to 5.10.177/5.15.106/6.1.23/6.2.10. This affects the function relid2channel of the component Vmbus Interrupt Service. Executing a manipulation can lead to null pointer dereference. This vulnerability is handled as CVE-2023-53273. There is not any exploit available. The affected component should be upgraded.

Detailsinfo

A vulnerability was found in Linux Kernel up to 5.10.177/5.15.106/6.1.23/6.2.10. It has been declared as critical. This vulnerability affects the function relid2channel of the component Vmbus Interrupt Service. The manipulation with an unknown input leads to a null pointer dereference vulnerability. The CWE definition for the vulnerability is 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. As an impact it is known to affect availability. CVE summarizes:

In the Linux kernel, the following vulnerability has been resolved: Drivers: vmbus: Check for channel allocation before looking up relids relid2channel() assumes vmbus channel array to be allocated when called. However, in cases such as kdump/kexec, not all relids will be reset by the host. When the second kernel boots and if the guest receives a vmbus interrupt during vmbus driver initialization before vmbus_connect() is called, before it finishes, or if it fails, the vmbus interrupt service routine is called which in turn calls relid2channel() and can cause a null pointer dereference. Print a warning and error out in relid2channel() for a channel id that's invalid in the second kernel.

The advisory is shared for download at git.kernel.org. This vulnerability was named CVE-2023-53273 since 09/16/2025. There are known technical details, but no exploit is available.

The vulnerability scanner Nessus provides a plugin with the ID 265202 (Linux Distros Unpatched Vulnerability : CVE-2023-53273), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 5.10.178, 5.15.107, 6.1.24 or 6.2.11 eliminates this vulnerability. Applying the patch 176c6b4889195fbe7016d9401175b48c5c9edf68/c373e49fbb87aa177819866ed9194ebc5414dfd6/8c3f0ae5435fd20bb1e3a8308488aa6ac33151ee/a5c44f3446a0565139b7d8abc78f58b86c398123/1eb65c8687316c65140b48fad27133d583178e15 is able to eliminate this problem. The bugfix is ready for download at git.kernel.org. The best possible mitigation is suggested to be upgrading to the latest version.

The vulnerability is also documented in the databases at Tenable (265202) and CERT Bund (WID-SEC-2025-2053). VulDB is the best source for vulnerability data and more expert information about this specific topic.

Affected

  • Debian Linux
  • Amazon Linux 2
  • Red Hat Enterprise Linux
  • Ubuntu Linux
  • SUSE Linux
  • Oracle Linux
  • IBM QRadar SIEM
  • SUSE openSUSE
  • Open Source Linux Kernel
  • RESF Rocky Linux
  • Dell Secure Connect Gateway
  • F5 F5OS

Productinfo

Type

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Name

Version

License

Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 5.6
VulDB Meta Temp Score: 5.5

VulDB Base Score: 5.7
VulDB Temp Score: 5.5
VulDB Vector: 🔒
VulDB Reliability: 🔍

NVD Base Score: 5.5
NVD Vector: 🔒

CVSSv2info

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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: Partially
Local: Yes
Remote: Partially

Availability: 🔒
Status: Not defined

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

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Nessus ID: 265202
Nessus Name: Linux Distros Unpatched Vulnerability : CVE-2023-53273

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: Kernel 5.10.178/5.15.107/6.1.24/6.2.11
Patch: 176c6b4889195fbe7016d9401175b48c5c9edf68/c373e49fbb87aa177819866ed9194ebc5414dfd6/8c3f0ae5435fd20bb1e3a8308488aa6ac33151ee/a5c44f3446a0565139b7d8abc78f58b86c398123/1eb65c8687316c65140b48fad27133d583178e15

Timelineinfo

09/16/2025 Advisory disclosed
09/16/2025 +0 days CVE reserved
09/16/2025 +0 days VulDB entry created
01/11/2026 +117 days VulDB entry last update

Sourcesinfo

Vendor: kernel.org

Advisory: git.kernel.org
Status: Confirmed

CVE: CVE-2023-53273 (🔒)
GCVE (CVE): GCVE-0-2023-53273
GCVE (VulDB): GCVE-100-324376
CERT Bund: WID-SEC-2025-2053 - Linux Kernel: Mehrere Schwachstellen

Entryinfo

Created: 09/16/2025 14:05
Updated: 01/11/2026 09:17
Changes: 09/16/2025 14:05 (59), 09/19/2025 22:31 (2), 12/03/2025 20:19 (10), 12/29/2025 09:03 (7), 01/11/2026 09:17 (1)
Complete: 🔍
Cache ID: 216::103

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