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Echo: linux: security update to 6.1.176-1

high Tenable Cloud Security Plugin ID 457084

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: Bluetooth: virtio_bt: clamp rx length
 before skb_put virtbt_rx_work() calls skb_put(skb, len) where len comes directly from virtqueue_get_buf()
 with no validation against the buffer we posted to the device. The RX skb is allocated in
 virtbt_add_inbuf() and exposed to virtio as exactly 1000 bytes via sg_init_one(). Checking len against
 skb_tailroom(skb) is not sufficient because alloc_skb() can leave more tailroom than the 1000 bytes
 actually handed to the device. A malicious or buggy backend can therefore report used.len between 1001 and
 skb_tailroom(skb), causing skb_put() to include uninitialized kernel heap bytes that were never written by
 the device. The same path also accepts len == 0, in which case skb_put(skb, 0) leaves the skb empty but
 virtbt_rx_handle() still reads the pkt_type byte from skb->data, consuming uninitialized memory. Define
 VIRTBT_RX_BUF_SIZE once and reuse it in alloc_skb() and sg_init_one(), and gate virtbt_rx_work() on that
 same constant so the bound checked matches the buffer actually exposed to the device. Reject used.len == 0
 in the same gate so an empty completion can no longer reach virtbt_rx_handle(). Use
 bt_dev_err_ratelimited() because the length value comes from an untrusted backend that can otherwise flood
 the kernel log. Same class of bug as commit c04db81cd028 ("net/9p: Fix buffer overflow in USB transport
 layer"), which hardened the USB 9p transport against unchecked device-reported length. (CVE-2026-46123)

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-2026-46123

Plugin Details

Severity: High

ID: 457084

Version: Revision 1.1

Type: Local

Published: 10/2/2026

Updated: 10/2/2026

Risk Information

VPR

Risk Factor: Medium

Score: 4.3

Percentile: 53.63

CVSS v2

Risk Factor: Medium

Base Score: 6.6

Temporal Score: 4.9

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

CVSS Score Source: CVE-2026-46123

CVSS v3

Risk Factor: High

Base Score: 7.7

Temporal Score: 6.7

Vector: CVSS:3.0/AV:L/AC:L/PR:N/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: 5/28/2026

Reference Information

CVE: CVE-2026-46123