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Echo: linux: security update to 6.1.176-1

medium Tenable Self-Hosted Container Security Plugin ID 465301

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: validate rx
 pkt_type header length virtbt_rx_handle() reads the leading pkt_type byte from the RX skb and forwards the
 remainder to hci_recv_frame() for every event/ACL/SCO/ISO type, without checking that the remaining
 payload is at least the fixed HCI header for that type. After the preceding patch bounds the backend-
 supplied used.len to [1, VIRTBT_RX_BUF_SIZE], a one-byte completion still reaches hci_recv_frame() with
 skb->len already pulled to 0. If the byte happened to be HCI_ACLDATA_PKT, the ACL-vs-ISO classification
 fast-path in hci_dev_classify_pkt_type() dereferences hci_acl_hdr(skb)->handle whenever the HCI device has
 an active CIS_LINK, BIS_LINK, or PA_LINK connection, reading two bytes of uninitialized RX-buffer data.
 The same hazard exists for every packet type the driver accepts because none of the switch cases in
 virtbt_rx_handle() check skb->len against the per-type minimum HCI header size before handing the frame to
 the core. After stripping pkt_type, require skb->len to cover the fixed header size for the selected type
 (event 2, ACL 4, SCO 3, ISO 4) before calling hci_recv_frame(); drop ratelimited otherwise. Unknown
 pkt_type values still take the original kfree_skb() default path. Use bt_dev_err_ratelimited() because
 both the length and pkt_type values come from an untrusted backend that can otherwise flood the kernel
 log. (CVE-2026-46186)

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-2026-46186

Plugin Details

Severity: Medium

ID: 465301

Version: Revision 1.1

Type: Local

Published: 10/2/2026

Updated: 10/2/2026

Risk Information

VPR

Risk Factor: Low

Score: 3

Percentile: 23.75

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-2026-46186

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: 5/28/2026

Vulnerability Publication Date: 5/28/2026

Reference Information

CVE: CVE-2026-46186