CVE-2026-23243

HIGH EPSS 2.6%
Published Mar 18, 20263mo ago · Modified Jun 17, 20261w ago
7.8 CVSS 3.1
High
Find Similar
Published Mar 18, 2026 3mo ago
Last Modified Jun 17, 2026 1w ago

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 Details

Base Score
7.8
Exploitability
1.8
Impact
5.9
Vector string
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Attack Vector Local
Attack Complexity Low
Privileges Required Low
User Interaction None
Scope Unchanged
Confidentiality High
Integrity High
Availability High

Threat Intelligence

EPSS Exploit Probability
2.6% percentile
Exploit & Patch Status
No Known Exploit
Patch Available

Weaknesses 1

CWE-787 Out-of-bounds Write Memory Safety

Affected Products 8

VendorProductVersionRange
linuxlinux_kernel*≥2.6.24.1  –  <5.10.252
linuxlinux_kernel*≥5.11  –  <5.15.202
linuxlinux_kernel*≥5.16  –  <6.1.165
linuxlinux_kernel*≥6.2  –  <6.6.128
linuxlinux_kernel*≥6.7  –  <6.12.75
linuxlinux_kernel*≥6.13  –  <6.18.14
linuxlinux_kernel*≥6.19  –  <6.19.4
linuxlinux_kernel2.6.24any

References 8

  • git.kernel.org https://git.kernel.org/stable/c/1371ef6b1ecf3676b8942f5dfb3634fb0648128e
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/205955f29c26330b1dc7fdeadd5bb97c38e26f56
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/362e45fd9069ffa1523f9f1633b606ebf72060d7
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/52ab82cc5cf8ada5c3fb6ffe8f32fdb2fc27a34b
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/5551b02fdbfd85a325bb857f3a8f9c9f33397ed2
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/6eb2919474ca105c5b13d19574e25f0ddcf19ca2
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/9c80d688f402539dfc8f336de1380d6b4ee14316
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/a6a3e4af10993cb9e4b8f0548680aba0ab5f3b0d
    Patch

Remediation

  • git.kernel.org https://git.kernel.org/stable/c/1371ef6b1ecf3676b8942f5dfb3634fb0648128e
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/205955f29c26330b1dc7fdeadd5bb97c38e26f56
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/362e45fd9069ffa1523f9f1633b606ebf72060d7
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/52ab82cc5cf8ada5c3fb6ffe8f32fdb2fc27a34b
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/5551b02fdbfd85a325bb857f3a8f9c9f33397ed2
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/6eb2919474ca105c5b13d19574e25f0ddcf19ca2
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/9c80d688f402539dfc8f336de1380d6b4ee14316
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/a6a3e4af10993cb9e4b8f0548680aba0ab5f3b0d
    Patch