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CVE-2026-23243

7.8 · HIGH

In the Linux kernel, the following vulnerability has been resolved: RDMA/umad: Reject negative data_len in ib_umad_write ib_umad_write computes data_len from user-controlled count and the MAD hea…

Published Mar 18, 2026CWE-787EPSS 0.14%

Overview

CVE-2026-23243 is a high-severity vulnerability. It was published on March 18, 2026 and has a CVSS 3.1 base score of 7.8 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.8, rated HIGH. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

Technical description

In the Linux kernel, the following vulnerability has been resolved:

RDMA/umad: Reject negative data_len in ib_umad_write

ib_umad_write computes data_len from user-controlled count and the

MAD header sizes. With a mismatched user MAD header size and RMPP

header length, data_len can become negative and reach ib_create_send_mad().

This can make the padding calculation exceed the segment size and trigger

an out-of-bounds memset in alloc_send_rmpp_list().

Add an explicit check to reject negative data_len before creating the

send buffer.

KASAN splat:

[ 211.363464] BUG: KASAN: slab-out-of-bounds in ib_create_send_mad+0xa01/0x11b0

[ 211.364077] Write of size 220 at addr ffff88800c3fa1f8 by task spray_thread/102

[ 211.365867] ib_create_send_mad+0xa01/0x11b0

[ 211.365887] ib_umad_write+0x853/0x1c80

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Refgit.kernel.org/stable/c/1371ef6b1ecf3676b8942f5dfb3634fb0648128eRefgit.kernel.org/stable/c/205955f29c26330b1dc7fdeadd5bb97c38e26f56Refgit.kernel.org/stable/c/362e45fd9069ffa1523f9f1633b606ebf72060d7Refgit.kernel.org/stable/c/52ab82cc5cf8ada5c3fb6ffe8f32fdb2fc27a34bRefgit.kernel.org/stable/c/5551b02fdbfd85a325bb857f3a8f9c9f33397ed2Refgit.kernel.org/stable/c/6eb2919474ca105c5b13d19574e25f0ddcf19ca2Refgit.kernel.org/stable/c/9c80d688f402539dfc8f336de1380d6b4ee14316Refgit.kernel.org/stable/c/a6a3e4af10993cb9e4b8f0548680aba0ab5f3b0dRefcert-portal.siemens.com/productcert/html/ssa-019113.htmlRefcert-portal.siemens.com/productcert/html/ssa-082556.html

How CyberStrike helps

Frequently asked questions

What is CVE-2026-23243?

CVE-2026-23243 is a high-severity vulnerability. It was published on March 18, 2026 and has a CVSS 3.1 base score of 7.8 (HIGH).

How severe is CVE-2026-23243?

This vulnerability has a CVSS 3.1 base score of 7.8, rated HIGH. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2026-23243?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2026-23243?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-23243 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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