CVE-2026-23243

Advisory lineage Upstream: 0 Downstream: 28
Analyzed
Published: 18 Mar 2026, 10:05
Last modified:11 May 2026, 22:03

Vulnerability Summary

Overall Risk (default)
medium
31/100
CVSS Score
7.8 HIGH
v3.1 (cve.org)
EPSS Score
0.02% LOW
0% probability 0.00%
KEV
Not listed
Ransomware
No reports
Public exploits
None found
Dark Web
Not detected

Timeline

18 Mar 2026, 10:05
Published
Vulnerability first disclosed
11 May 2026, 22:03
Last Modified
Vulnerability information updated

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

CVSS Metrics

  • v3.1•HIGH•Score: 7.8CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

EPSS Trends

Current EPSS score: 0.02%• Percentile: 6%

Techniques & Countermeasures

  • CWE-787•Out-of-bounds Write

    The product writes data past the end, or before the beginning, of the intended buffer.

Affected Systems

  • linux•linux

    ≥ 2be8e3ee8efd6f99ce454115c29d09750915021a, < 1371ef6b1ecf3676b8942f5dfb3634fb0648128e | ≥ 2be8e3ee8efd6f99ce454115c29d09750915021a, < 362e45fd9069ffa1523f9f1633b606ebf72060d7 | ≥ 2be8e3ee8efd6f99ce454115c29d09750915021a, < 6eb2919474ca105c5b13d19574e25f0ddcf19ca2 | ≥ 2be8e3ee8efd6f99ce454115c29d09750915021a, < a6a3e4af10993cb9e4b8f0548680aba0ab5f3b0d | ≥ 2be8e3ee8efd6f99ce454115c29d09750915021a, < 9c80d688f402539dfc8f336de1380d6b4ee14316 | ≥ 2be8e3ee8efd6f99ce454115c29d09750915021a, < 205955f29c26330b1dc7fdeadd5bb97c38e26f56 | ≥ 2be8e3ee8efd6f99ce454115c29d09750915021a, < 52ab82cc5cf8ada5c3fb6ffe8f32fdb2fc27a34b | ≥ 2be8e3ee8efd6f99ce454115c29d09750915021a, < 5551b02fdbfd85a325bb857f3a8f9c9f33397ed2 | 2.6.24

  • linux•linux_kernel

    ≥ 2.6.24.1, < 5.10.252 | ≥ 5.11, < 5.15.202 | ≥ 5.16, < 6.1.165 | ≥ 6.2, < 6.6.128 | ≥ 6.7, < 6.12.75 | ≥ 6.13, < 6.18.14 | ≥ 6.19, < 6.19.4 | 2.6.24

References (8)