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Echo: linux: security update to 6.1.176-1

high Tenable Self-Hosted Container Security Plugin ID 459074

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: fbdev: udlfb: add vm_ops to
 dlfb_ops_mmap to prevent use-after-free dlfb_ops_mmap() uses remap_pfn_range() to map vmalloc framebuffer
 pages to userspace but sets no vm_ops on the VMA. This means the kernel cannot track active mmaps. When
 dlfb_realloc_framebuffer() replaces the backing buffer via FBIOPUT_VSCREENINFO, existing mmap PTEs are not
 invalidated. On USB disconnect, dlfb_ops_destroy() calls vfree() on the old pages while userspace PTEs
 still reference them, resulting in a use-after-free: the process retains read/write access to freed kernel
 pages. Add vm_operations_struct with open/close callbacks that maintain an atomic mmap_count on struct
 dlfb_data. In dlfb_realloc_framebuffer(), check mmap_count and return -EBUSY if the buffer is currently
 mapped, preventing buffer replacement while userspace holds stale PTEs. Tested with PoC using dummy_hcd +
 raw_gadget USB device emulation. (CVE-2026-43497)

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-2026-43497

Plugin Details

Severity: High

ID: 459074

Version: Revision 1.1

Type: Local

Published: 10/2/2026

Updated: 10/2/2026

Risk Information

VPR

Risk Factor: Medium

Score: 4.9

Percentile: 58.14

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-2026-43497

CVSS v3

Risk Factor: High

Base Score: 7.3

Temporal Score: 6.4

Vector: CVSS:3.0/AV:L/AC:L/PR:L/UI:R/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: 5/22/2026

Vulnerability Publication Date: 5/21/2026

Reference Information

CVE: CVE-2026-43497