Linux Kernel up to 6.19.8 process_message_header out-of-bounds

CVSS Meta Temp Score
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Current Exploit Price (≈)
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CTI Interest Score
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6.2$0-$5k0.00

Summaryinfo

A vulnerability described as critical has been identified in Linux Kernel up to 6.19.8. The impacted element is the function process_message_header. Executing a manipulation can lead to out-of-bounds. This vulnerability appears as CVE-2026-43406. There is no available exploit. Upgrading the affected component is recommended.

Detailsinfo

A vulnerability was found in Linux Kernel up to 6.19.8. It has been declared as problematic. This vulnerability affects the function process_message_header. The manipulation with an unknown input leads to a out-of-bounds vulnerability. The CWE definition for the vulnerability is CWE-125. The product reads data past the end, or before the beginning, of the intended buffer. As an impact it is known to affect confidentiality. CVE summarizes:

In the Linux kernel, the following vulnerability has been resolved: libceph: prevent potential out-of-bounds reads in process_message_header() If the message frame is (maliciously) corrupted in a way that the length of the control segment ends up being less than the size of the message header or a different frame is made to look like a message frame, out-of-bounds reads may ensue in process_message_header(). Perform an explicit bounds check before decoding the message header.

The advisory is shared for download at git.kernel.org. This vulnerability was named CVE-2026-43406 since 05/01/2026. There are known technical details, but no exploit is available. The current price for an exploit might be approx. USD $0-$5k (estimation calculated on 06/27/2026).

The vulnerability scanner Nessus provides a plugin with the ID 323086 (SUSE SLED15: cluster-md-kmp-default / dlm-kmp-default / gfs2-kmp-default / etc (SUSE-SU-2026:2482-1)), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 5.15.203, 6.1.167, 6.6.130, 6.12.78, 6.18.19 or 6.19.9 eliminates this vulnerability. Applying the patch 76ccf21a12c5f6d6790bc32c7da82446d877b2f4/75582aaa580c11aed4c7731cad6b068b700e7efb/50156622eb0888e62541d715a98584480a1bc7cb/dbd857a9e1e33ea71eaf3e211877027e533770d1/69fe5af33fa3806f398d21c081d73c66e5523bc2/035867ae6f18df0aeedb2a57a5b74091bd4e3fe8/69fb5d91bba44ecf7eb80530b85fa4fb028921d5 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 vulnerability database at Tenable (323086). VulDB is the best source for vulnerability data and more expert information about this specific topic.

Productinfo

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CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 6.3
VulDB Meta Temp Score: 6.2

VulDB Base Score: 3.5
VulDB Temp Score: 3.4
VulDB Vector: 🔒
VulDB Reliability: 🔍

CNA Base Score: 9.1
CNA Vector (Linux): 🔒

CVSSv2info

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

Exploitinginfo

Class: Out-of-bounds
CWE: CWE-125 / CWE-119
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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Nessus ID: 323086
Nessus Name: SUSE SLED15: cluster-md-kmp-default / dlm-kmp-default / gfs2-kmp-default / etc (SUSE-SU-2026:2482-1)

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: Kernel 5.15.203/6.1.167/6.6.130/6.12.78/6.18.19/6.19.9
Patch: 76ccf21a12c5f6d6790bc32c7da82446d877b2f4/75582aaa580c11aed4c7731cad6b068b700e7efb/50156622eb0888e62541d715a98584480a1bc7cb/dbd857a9e1e33ea71eaf3e211877027e533770d1/69fe5af33fa3806f398d21c081d73c66e5523bc2/035867ae6f18df0aeedb2a57a5b74091bd4e3fe8/69fb5d91bba44ecf7eb80530b85fa4fb028921d5

Timelineinfo

05/01/2026 CVE reserved
05/08/2026 +7 days Advisory disclosed
05/08/2026 +0 days VulDB entry created
06/27/2026 +50 days VulDB entry last update

Sourcesinfo

Vendor: kernel.org

Advisory: git.kernel.org
Status: Confirmed

CVE: CVE-2026-43406 (🔒)
GCVE (CVE): GCVE-0-2026-43406
GCVE (VulDB): GCVE-100-362248

Entryinfo

Created: 05/08/2026 18:32
Updated: 06/27/2026 15:46
Changes: 05/08/2026 18:32 (58), 05/22/2026 01:37 (11), 06/27/2026 15:46 (2)
Complete: 🔍
Cache ID: 216::103

VulDB is the best source for vulnerability data and more expert information about this specific topic.

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