Linux Kernel up to 6.18.28/7.0.5/7.1-rc2 rxrpc rxrpc_input_call_event infinite loop

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6.9	$0-$5k	0.00

Summaryinfo

A vulnerability marked as critical has been reported in Linux Kernel up to 6.18.28/7.0.5/7.1-rc2. Affected by this issue is the function rxrpc_input_call_event of the component rxrpc. Performing a manipulation results in infinite loop. This vulnerability was named CVE-2026-43500. In addition, an exploit is available. It is suggested to upgrade the affected component.

Detailsinfo

A vulnerability classified as critical has been found in Linux Kernel up to 6.18.28/7.0.5/7.1-rc2. This affects the function rxrpc_input_call_event of the component rxrpc. The manipulation with an unknown input leads to a infinite loop vulnerability. CWE is classifying the issue as CWE-835. The product contains an iteration or loop with an exit condition that cannot be reached, i.e., an infinite loop. This is going to have an impact on availability. The summary by CVE is:

In the Linux kernel, the following vulnerability has been resolved: rxrpc: Also unshare DATA/RESPONSE packets when paged frags are present The DATA-packet handler in rxrpc_input_call_event() and the RESPONSE handler in rxrpc_verify_response() copy the skb to a linear one before calling into the security ops only when skb_cloned() is true. An skb that is not cloned but still carries externally-owned paged fragments (e.g. SKBFL_SHARED_FRAG set by splice() into a UDP socket via __ip_append_data, or a chained skb_has_frag_list()) falls through to the in-place decryption path, which binds the frag pages directly into the AEAD/skcipher SGL via skb_to_sgvec(). Extend the gate to also unshare when skb_has_frag_list() or skb_has_shared_frag() is true. This catches the splice-loopback vector and other externally-shared frag sources while preserving the zero-copy fast path for skbs whose frags are kernel-private (e.g. NIC page_pool RX, GRO). The OOM/trace handling already in place is reused.

It is possible to read the advisory at git.kernel.org. This vulnerability is uniquely identified as CVE-2026-43500 since 05/01/2026. The exploitability is told to be difficult. Technical details and a public exploit are known.

The exploit is shared for download at exploit-db.com. It is declared as proof-of-concept. The vulnerability scanner Nessus provides a plugin with the ID 313681 (SUSE SLES15 Security Update : kernel (SUSE-SU-2026:1778-1)), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 6.18.29, 7.0.6 or 7.1-rc3 eliminates this vulnerability. Applying the patch 3eae0f4f9f7206a4801efa5e0235c25bbd5a412c/d45179f8795222ce858770dc619abe51f9d24411/aa54b1d27fe0c2b78e664a34fd0fdf7cd1960d71 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 Exploit-DB (52585), Tenable (313681) and CERT Bund (WID-SEC-2026-1430). Be aware that VulDB is the high quality source for vulnerability data.

Affected

Debian Linux
Google Cloud Platform
Amazon Linux 2
Red Hat Enterprise Linux
Fedora Linux
Mitel MiCollab
Ubuntu Linux
SUSE Linux
Oracle Linux
QNAP NAS
SUSE openSUSE
RESF Rocky Linux
Microsoft Azure Linux
Open Source Linux Kernel
Red Hat OpenShift
Red Hat OpenStack
Nutanix Files
Nutanix Kubernetes Engine
Mitel OpenScape
Mitel Performance Analytics
Mitel SIP Phone
IBM QRadar SIEM
Moxa MXsecurity

Productinfo

Type

Operating System

Vendor

Linux

Name

Kernel

Version

License

open-source

Website

Vendor: https://www.kernel.org/

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 7.0
VulDB Meta Temp Score: 6.9

VulDB Base Score: 4.8
VulDB Temp Score: 4.3
VulDB Vector: 🔒
VulDB Reliability: 🔍

NVD Base Score: 7.8
NVD Vector: 🔒

CNA Base Score: 7.8
CNA Vector (Linux): 🔒

ADP CISA Base Score: 7.8
ADP CISA Vector: 🔒

CVSSv2info

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Vector	Complexity	Authentication	Confidentiality	Integrity	Availability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Infinite loop
CWE: CWE-835 / CWE-404
CAPEC: 🔒
ATT&CK: 🔒

Physical: Partially
Local: Yes
Remote: Partially

Availability: 🔒
Access: Public
Status: Proof-of-Concept
Download: 🔒

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

0-Day	Unlock	Unlock	Unlock	Unlock
Today	Unlock	Unlock	Unlock	Unlock

Nessus ID: 313681
Nessus Name: SUSE SLES15 Security Update : kernel (SUSE-SU-2026:1778-1)

Exploit-DB: 🔒

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: Kernel 6.18.29/7.0.6/7.1-rc3
Patch: 3eae0f4f9f7206a4801efa5e0235c25bbd5a412c/d45179f8795222ce858770dc619abe51f9d24411/aa54b1d27fe0c2b78e664a34fd0fdf7cd1960d71

Timelineinfo

05/01/2026 CVE reserved
05/11/2026 +10 days Advisory disclosed
05/11/2026 +0 days VulDB entry created
07/02/2026 +52 days VulDB entry last update

Sourcesinfo

Vendor: kernel.org

Advisory: git.kernel.org
Status: Confirmed

CVE: CVE-2026-43500 (🔒)
GCVE (CVE): GCVE-0-2026-43500
GCVE (VulDB): GCVE-100-362583
CERT Bund: WID-SEC-2026-1430 - Linux Kernel (Dirty Frag): Mehrere Schwachstellen ermöglichen Erlangen von Administratorrechten

scip Labs: https://www.scip.ch/en/?labs.20161013

Entryinfo

Created: 05/11/2026 09:55
Updated: 07/02/2026 19:25
Changes: 05/11/2026 09:55 (59), 05/11/2026 15:37 (2), 05/12/2026 15:04 (7), 05/18/2026 11:49 (20), 05/25/2026 23:05 (1), 05/28/2026 02:27 (11), 06/17/2026 13:02 (1), 06/25/2026 13:12 (1), 07/02/2026 19:25 (11)
Complete: 🔍
Cache ID: 216::103