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Echo: linux: security update to 6.1.133-1

high Tenable Self-Hosted Container Security Plugin ID 461966

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: x86/microcode/AMD: Fix out-of-bounds
 on systems with CPU-less NUMA nodes Currently, load_microcode_amd() iterates over all NUMA nodes,
 retrieves their CPU masks and unconditionally accesses per-CPU data for the first CPU of each mask.
 According to Documentation/admin-guide/mm/numaperf.rst: "Some memory may share the same node as a CPU, and
 others are provided as memory only nodes." Therefore, some node CPU masks may be empty and wouldn't have a
 "first CPU". On a machine with far memory (and therefore CPU-less NUMA nodes): - cpumask_of_node(nid) is 0
 - cpumask_first(0) is CONFIG_NR_CPUS - cpu_data(CONFIG_NR_CPUS) accesses the cpu_info per-CPU array at an
 index that is 1 out of bounds This does not have any security implications since flashing microcode is a
 privileged operation but I believe this has reliability implications by potentially corrupting memory
 while flashing a microcode update. When booting with CONFIG_UBSAN_BOUNDS=y on an AMD machine that flashes
 a microcode update. I get the following splat: UBSAN: array-index-out-of-bounds in
 arch/x86/kernel/cpu/microcode/amd.c:X:Y index 512 is out of range for type 'unsigned long[512]' [...] Call
 Trace: dump_stack __ubsan_handle_out_of_bounds load_microcode_amd request_microcode_amd reload_store
 kernfs_fop_write_iter vfs_write ksys_write do_syscall_64 entry_SYSCALL_64_after_hwframe Change the loop to
 go over only NUMA nodes which have CPUs before determining whether the first CPU on the respective node
 needs microcode update. [ bp: Massage commit message, fix typo. ] (CVE-2025-21991)

Solution

Update the linux library and its related packages to version 6.1.133-1 or later.

See Also

https://advisory.echohq.com/cve/CVE-2025-21991

Plugin Details

Severity: High

ID: 461966

Version: Revision 1.1

Type: Local

Published: 10/2/2026

Updated: 10/2/2026

Risk Information

VPR

Risk Factor: Medium

Score: 4.9

Percentile: 57.12

CVSS v2

Risk Factor: Medium

Base Score: 6.8

Temporal Score: 5

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

CVSS Score Source: CVE-2025-21991

CVSS v3

Risk Factor: High

Base Score: 7.8

Temporal Score: 6.8

Vector: CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/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: 1/28/2026

Vulnerability Publication Date: 4/2/2025

Reference Information

CVE: CVE-2025-21991