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Echo: linux: security update to 6.1.162-1

medium Tenable Self-Hosted Container Security Plugin ID 457796

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: ksm: use range-walk function to jump
 over holes in scan_get_next_rmap_item Currently, scan_get_next_rmap_item() walks every page address in a
 VMA to locate mergeable pages. This becomes highly inefficient when scanning large virtual memory areas
 that contain mostly unmapped regions, causing ksmd to use large amount of cpu without deduplicating much
 pages. This patch replaces the per-address lookup with a range walk using walk_page_range(). The range
 walker allows KSM to skip over entire unmapped holes in a VMA, avoiding unnecessary lookups. This problem
 was previously discussed in [1]. Consider the following test program which creates a 32 TiB mapping in the
 virtual address space but only populates a single page: #include <unistd.h> #include <stdio.h> #include
 <sys/mman.h> /* 32 TiB */ const size_t size = 32ul * 1024 * 1024 * 1024 * 1024; int main() { char *area =
 mmap(NULL, size, PROT_READ | PROT_WRITE, MAP_NORESERVE | MAP_PRIVATE | MAP_ANON, -1, 0); if (area ==
 MAP_FAILED) { perror("mmap() failed\n"); return -1; } /* Populate a single page such that we get an
 anon_vma. */ *area = 0; /* Enable KSM. */ madvise(area, size, MADV_MERGEABLE); pause(); return 0; } $
 ./ksm-sparse & $ echo 1 > /sys/kernel/mm/ksm/run Without this patch ksmd uses 100% of the cpu for a long
 time (more then 1 hour in my test machine) scanning all the 32 TiB virtual address space that contain only
 one mapped page. This makes ksmd essentially deadlocked not able to deduplicate anything of value. With
 this patch ksmd walks only the one mapped page and skips the rest of the 32 TiB virtual address space,
 making the scan fast using little cpu. (CVE-2025-68211)

Solution

Update the linux library and its related packages to version 6.1.162-1 or later.

See Also

https://advisory.echohq.com/cve/CVE-2025-68211

Plugin Details

Severity: Medium

ID: 457796

Version: Revision 1.1

Type: Local

Published: 10/2/2026

Updated: 10/2/2026

Risk Information

VPR

Risk Factor: Medium

Score: 5

Percentile: 93.19

CVSS v2

Risk Factor: Medium

Base Score: 4.6

Temporal Score: 3.4

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

CVSS Score Source: CVE-2025-68211

CVSS v3

Risk Factor: Medium

Base Score: 5.5

Temporal Score: 4.8

Vector: CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:N/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: 12/16/2025

Vulnerability Publication Date: 12/16/2025

Reference Information

CVE: CVE-2025-68211