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Echo: linux: security update to 6.1.176-1

high Tenable Cloud Security Plugin ID 460948

Description

There are packages installed that are affected by a vulnerability referenced in the following CVE:

 - 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.
 (CVE-2026-46064)

Solution

Update the linux library and its related packages to version 6.1.176-1 or later.

See Also

https://advisory.echohq.com/cve/CVE-2026-46064

Plugin Details

Severity: High

ID: 460948

Version: Revision 1.1

Type: Local

Published: 10/2/2026

Updated: 10/2/2026

Risk Information

VPR

Risk Factor: Medium

Score: 4.3

Percentile: 53.64

CVSS v2

Risk Factor: Medium

Base Score: 6.2

Temporal Score: 4.6

Vector: CVSS2#AV:L/AC:L/Au:S/C:C/I:N/A:C

CVSS Score Source: CVE-2026-46064

CVSS v3

Risk Factor: High

Base Score: 7.1

Temporal Score: 6.2

Vector: CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H

Temporal Vector: CVSS:3.0/E:U/RL:O/RC:C

Vulnerability Information

Exploit Ease: No known exploits are available

Patch Publication Date: 5/28/2026

Vulnerability Publication Date: 5/27/2026

Reference Information

CVE: CVE-2026-46064