In the Linux kernel, the following vulnerability has been resolved:
ibmasm: fix heap over-read in ibmasm_send_i2o_message()
The ibmasm_send_i2o_message() function uses get_dot_command_size() to
compute the byte count for memcpy_toio(), but this value is derived from
user-controlled fields in the dot_command_header (command_size: u8,
data_size: u16) and is never validated against the actual allocation size.
A root user can write a small buffer with inflated header fields, causing
memcpy_toio() to read up to ~65 KB past the end of the allocation into
adjacent kernel heap, which is then forwarded to the service processor
over MMIO.
Silently clamping the copy size is not sufficient: if the header fields
claim a larger size than the buffer, the SP receives a dot command whose
own header is inconsistent with the I2O message length, which can cause
the SP to desynchronize. Reject such commands outright by returning
failure.
Validate command_size before calling get_mfa_inbound() to avoid leaking
an I2O message frame: reading INBOUND_QUEUE_PORT dequeues a hardware
frame from the controller's free pool, and returning without a
corresponding set_mfa_inbound() call would permanently exhaust it.
Additionally, clamp command_size to I2O_COMMAND_SIZE before the
memcpy_toio() so the MMIO write stays within the I2O message frame,
consistent with the clamping already performed by outgoing_message_size()
for the header field.
References
Configurations
Configuration 1 (hide)
|
History
24 Jun 2026, 17:08
| Type | Values Removed | Values Added |
|---|---|---|
| First Time |
Linux linux Kernel
Linux |
|
| CVSS |
v2 : v3 : |
v2 : unknown
v3 : 7.1 |
| References | () https://git.kernel.org/stable/c/9aad71144fa3682cca3837a06c8623016790e7ec - Patch | |
| References | () https://git.kernel.org/stable/c/9e8f6c9d4ecddda2f28baa1678340286cff3969c - Patch | |
| References | () https://git.kernel.org/stable/c/b870f652877bfbe321bd0f4096fc37a93296f7b6 - Patch | |
| References | () https://git.kernel.org/stable/c/c1c2417c60dbdca5ebb00462f21ee71c2d7f7083 - Patch | |
| References | () https://git.kernel.org/stable/c/ca1c857e2bb74a9fc0606128334f85316d57067b - Patch | |
| References | () https://git.kernel.org/stable/c/ce57fa439bd1b5d664f334a0c3e3f0e42abb0153 - Patch | |
| References | () https://git.kernel.org/stable/c/fd19eb1c75047a4ed4e855f56cafd704dc3914e0 - Patch | |
| References | () https://git.kernel.org/stable/c/fe31722b0194ff76bf8b461e8bf97a2081147787 - Patch | |
| CWE | CWE-125 | |
| CPE | cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* cpe:2.3:o:linux:linux_kernel:2.6.12:-:*:*:*:*:*:* cpe:2.3:o:linux:linux_kernel:2.6.12:rc4:*:*:*:*:*:* cpe:2.3:o:linux:linux_kernel:2.6.12:rc5:*:*:*:*:*:* cpe:2.3:o:linux:linux_kernel:2.6.12:rc2:*:*:*:*:*:* cpe:2.3:o:linux:linux_kernel:2.6.12:rc3:*:*:*:*:*:* |
01 Jun 2026, 17:17
| Type | Values Removed | Values Added |
|---|---|---|
| References |
|
27 May 2026, 14:17
| Type | Values Removed | Values Added |
|---|---|---|
| New CVE |
Information
Published : 2026-05-27 14:17
Updated : 2026-06-24 17:08
NVD link : CVE-2026-46064
Mitre link : CVE-2026-46064
CVE.ORG link : CVE-2026-46064
JSON object : View
Products Affected
linux
- linux_kernel
CWE
CWE-125
Out-of-bounds Read