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Echo: linux: security update to 6.1.170-1

high Tenable Cloud Security Plugin ID 462198

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: xen/privcmd: fix double free via VMA
 splitting privcmd_vm_ops defines .close (privcmd_close), but neither .may_split nor .open. When userspace
 does a partial munmap() on a privcmd mapping, the kernel splits the VMA via __split_vma(). Since may_split
 is NULL, the split is allowed. vm_area_dup() copies vm_private_data (a pages array allocated in
 alloc_empty_pages()) into the new VMA without any fixup, because there is no .open callback. Both VMAs now
 point to the same pages array. When the unmapped portion is closed, privcmd_close() calls: -
 xen_unmap_domain_gfn_range() - xen_free_unpopulated_pages() - kvfree(pages) The surviving VMA still holds
 the dangling pointer. When it is later destroyed, the same sequence runs again, which leads to a double
 free. Fix this issue by adding a .may_split callback denying the VMA split. This is XSA-487 /
 CVE-2026-31787 (CVE-2026-31787)

Solution

Update the linux library and its related packages to version 6.1.170-1 or later.

See Also

https://advisory.echohq.com/cve/CVE-2026-31787

Plugin Details

Severity: High

ID: 462198

Version: Revision 1.1

Type: Local

Published: 10/2/2026

Updated: 10/2/2026

Risk Information

VPR

Risk Factor: Medium

Score: 4.9

Percentile: 57.92

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-2026-31787

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: 5/1/2026

Vulnerability Publication Date: 4/30/2026

Reference Information

CVE: CVE-2026-31787