CVE-2026-43406
Linux Kernel out-of-bounds read
- Published8 May 2026
Description
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.
CVSS 3.1 breakdown
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:HAffected products
Remediation
- https://git.kernel.org/stable/c/035867ae6f18df0aeedb2a57a5b74091bd4e3fe8
- https://git.kernel.org/stable/c/50156622eb0888e62541d715a98584480a1bc7cb
- https://git.kernel.org/stable/c/69fb5d91bba44ecf7eb80530b85fa4fb028921d5
- https://git.kernel.org/stable/c/69fe5af33fa3806f398d21c081d73c66e5523bc2
- https://git.kernel.org/stable/c/75582aaa580c11aed4c7731cad6b068b700e7efb
- https://git.kernel.org/stable/c/76ccf21a12c5f6d6790bc32c7da82446d877b2f4
References
- https://git.kernel.org/stable/c/035867ae6f18df0aeedb2a57a5b74091bd4e3fe8
- https://git.kernel.org/stable/c/50156622eb0888e62541d715a98584480a1bc7cb
- https://git.kernel.org/stable/c/69fb5d91bba44ecf7eb80530b85fa4fb028921d5
- https://git.kernel.org/stable/c/69fe5af33fa3806f398d21c081d73c66e5523bc2
- https://git.kernel.org/stable/c/75582aaa580c11aed4c7731cad6b068b700e7efb
- https://git.kernel.org/stable/c/76ccf21a12c5f6d6790bc32c7da82446d877b2f4
- https://git.kernel.org/stable/c/dbd857a9e1e33ea71eaf3e211877027e533770d1
Related CVEs
Recent high-severity vulnerabilities sharing a weakness type.
Frequently asked
Is CVE-2026-43406 being actively exploited?
CVE-2026-43406 is not in the CISA KEV catalog. Its EPSS exploit probability is 0.72%.
How severe is CVE-2026-43406?
CVE-2026-43406 has a CVSS 3.1 base score of 9.1, rated critical. EPSS estimates a 0.72% probability of exploitation.
Which products are affected by CVE-2026-43406?
Affected products include Linux Kernel.
How do I fix CVE-2026-43406?
Upgrade affected software to a fixed version, for example Linux Kernel 5.15.203 or later, then confirm no affected versions remain in your inventory.
How Secuno handles this
Secuno correlates vulnerabilities like CVE-2026-43406 against the real software inventory on every managed device, every day. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.
Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.