PT-2026-26046 · Linux+1 · Linux Kernel+1
Jann Horn
·
Published
2026-01-01
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Updated
2026-05-28
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CVE-2026-23243
CVSS v3.1
7.8
High
| Vector | AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |
Name of the Vulnerable Software and Affected Versions
Linux kernel (affected versions not specified)
Description
An issue exists in the Linux kernel’s RDMA/umad component where a negative
data len value can occur in the ib umad write function. This happens when there is a mismatch between the user-controlled MAD header size and the RMPP header length. The negative data len can then lead to an out-of-bounds write in the alloc send rmpp list() function via an incorrect padding calculation within ib create send mad(). The issue is addressed by adding a check to reject negative data len values before creating the send buffer. The function ib umad write computes data len from a user-controlled count and MAD header sizes.Recommendations
At the moment, there is no information about a newer version that contains a fix for this vulnerability.
Exploit
Memory Corruption
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Weakness Enumeration
Related Identifiers
Affected Products
Linux Kernel
Rocky Linux