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National Vulnerability Database

National Vulnerability Database

NVD

National Vulnerability Database
  1. Vulnerabilities

CVE-2026-23243 Detail

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


Metrics

 
NVD enrichment efforts reference publicly available information to associate vector strings. CVSS information contributed by other sources is also displayed.
CVSS 4.0 Severity and Vector Strings:

NIST CVSS score
NIST: NVD
N/A
NVD assessment not yet provided.

References to Advisories, Solutions, and Tools

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URL Source(s) Tag(s)
https://git.kernel.org/stable/c/1371ef6b1ecf3676b8942f5dfb3634fb0648128e kernel.org Patch 
https://git.kernel.org/stable/c/205955f29c26330b1dc7fdeadd5bb97c38e26f56 kernel.org Patch 
https://git.kernel.org/stable/c/362e45fd9069ffa1523f9f1633b606ebf72060d7 kernel.org Patch 
https://git.kernel.org/stable/c/52ab82cc5cf8ada5c3fb6ffe8f32fdb2fc27a34b kernel.org Patch 
https://git.kernel.org/stable/c/5551b02fdbfd85a325bb857f3a8f9c9f33397ed2 kernel.org Patch 
https://git.kernel.org/stable/c/6eb2919474ca105c5b13d19574e25f0ddcf19ca2 kernel.org Patch 
https://git.kernel.org/stable/c/9c80d688f402539dfc8f336de1380d6b4ee14316 kernel.org Patch 
https://git.kernel.org/stable/c/a6a3e4af10993cb9e4b8f0548680aba0ab5f3b0d kernel.org Patch 

Weakness Enumeration

CWE-ID CWE Name Source
CWE-787 Out-of-bounds Write cwe source acceptance level NIST  

Known Affected Software Configurations Switch to CPE 2.2

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Change History

3 change records found show changes

Quick Info

CVE Dictionary Entry:
CVE-2026-23243
NVD Published Date:
03/18/2026
NVD Last Modified:
05/21/2026
Source:
kernel.org