CVE-2026-23243

  1. OpenCVE
  2. Vulnerabilities (CVE)
  3. CVE-2026-23243
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

7.8 /10

CVSS v3 : HIGH

V3 Legend

Vector :

Exploitability : 1.8 / Impact : 5.9

Attack Vector LOCAL

Attack Complexity LOW

Privileges Required LOW

User Interaction NONE

Confidentiality Impact HIGH

Integrity Impact HIGH

Availability Impact HIGH

Scope UNCHANGED

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

Configuration 1 (hide)

OR cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:2.6.24:-:*:*:*:*:*:*
History

21 May 2026, 15:52

Type Values Removed Values Added
References () https://git.kernel.org/stable/c/1371ef6b1ecf3676b8942f5dfb3634fb0648128e - () https://git.kernel.org/stable/c/1371ef6b1ecf3676b8942f5dfb3634fb0648128e - Patch
References () https://git.kernel.org/stable/c/205955f29c26330b1dc7fdeadd5bb97c38e26f56 - () https://git.kernel.org/stable/c/205955f29c26330b1dc7fdeadd5bb97c38e26f56 - Patch
References () https://git.kernel.org/stable/c/362e45fd9069ffa1523f9f1633b606ebf72060d7 - () https://git.kernel.org/stable/c/362e45fd9069ffa1523f9f1633b606ebf72060d7 - Patch
References () https://git.kernel.org/stable/c/52ab82cc5cf8ada5c3fb6ffe8f32fdb2fc27a34b - () https://git.kernel.org/stable/c/52ab82cc5cf8ada5c3fb6ffe8f32fdb2fc27a34b - Patch
References () https://git.kernel.org/stable/c/5551b02fdbfd85a325bb857f3a8f9c9f33397ed2 - () https://git.kernel.org/stable/c/5551b02fdbfd85a325bb857f3a8f9c9f33397ed2 - Patch
References () https://git.kernel.org/stable/c/6eb2919474ca105c5b13d19574e25f0ddcf19ca2 - () https://git.kernel.org/stable/c/6eb2919474ca105c5b13d19574e25f0ddcf19ca2 - Patch
References () https://git.kernel.org/stable/c/9c80d688f402539dfc8f336de1380d6b4ee14316 - () https://git.kernel.org/stable/c/9c80d688f402539dfc8f336de1380d6b4ee14316 - Patch
References () https://git.kernel.org/stable/c/a6a3e4af10993cb9e4b8f0548680aba0ab5f3b0d - () https://git.kernel.org/stable/c/a6a3e4af10993cb9e4b8f0548680aba0ab5f3b0d - Patch
CWE CWE-787
First Time Linux linux Kernel
Linux
CPE cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:2.6.24:-:*:*:*:*:*:*

02 Apr 2026, 15:16

Type Values Removed Values Added
CVSS v2 : unknown
v3 : unknown 		v2 : unknown
v3 : 7.8
Summary
  • (es) En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta: RDMA/umad: Rechazar data_len negativo en ib_umad_write ib_umad_write calcula data_len a partir de un conteo controlado por el usuario y los tamaños de encabezado MAD. Con un tamaño de encabezado MAD de usuario no coincidente y una longitud de encabezado RMPP, data_len puede volverse negativo y alcanzar ib_create_send_mad(). Esto puede hacer que el cálculo de relleno exceda el tamaño del segmento y desencadenar un memset fuera de límites en alloc_send_rmpp_list(). Se añade una verificación explícita para rechazar data_len negativo antes de crear el búfer de envío. KASAN splat: [ 211.363464] ERROR: KASAN: slab-out-of-bounds en ib_create_send_mad+0xa01/0x11b0 [ 211.364077] Escritura de tamaño 220 en la dirección ffff88800c3fa1f8 por la tarea spray_thread/102 [ 211.365867] ib_create_send_mad+0xa01/0x11b0 [ 211.365887] ib_umad_write+0x853/0x1c80

18 Mar 2026, 11:16

Type Values Removed Values Added
New CVE
Information

Published : 2026-03-18 11:16

Updated : 2026-05-21 15:52

NVD link : CVE-2026-23243

Mitre link : CVE-2026-23243

CVE.ORG link : CVE-2026-23243

JSON object : View

Products Affected

linux

  • linux_kernel
CWE
CWE-787

Out-of-bounds Write