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Echo: linux: security update to 6.1.176-1

high Tenable Cloud Security Plugin ID 460568

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: usbip: validate number_of_packets in
 usbip_pack_ret_submit() When a USB/IP client receives a RET_SUBMIT response, usbip_pack_ret_submit()
 unconditionally overwrites urb->number_of_packets from the network PDU. This value is subsequently used as
 the loop bound in usbip_recv_iso() and usbip_pad_iso() to iterate over urb->iso_frame_desc[], a flexible
 array whose size was fixed at URB allocation time based on the *original* number_of_packets from the
 CMD_SUBMIT. A malicious USB/IP server can set number_of_packets in the response to a value larger than
 what was originally submitted, causing a heap out-of-bounds write when usbip_recv_iso() writes to
 urb->iso_frame_desc[i] beyond the allocated region. KASAN confirmed this with kernel 7.0.0-rc5: BUG:
 KASAN: slab-out-of-bounds in usbip_recv_iso+0x46a/0x640 Write of size 4 at addr ffff888106351d40 by task
 vhci_rx/69 The buggy address is located 0 bytes to the right of allocated 320-byte region
 [ffff888106351c00, ffff888106351d40) The server side (stub_rx.c) and gadget side (vudc_rx.c) already
 validate number_of_packets in the CMD_SUBMIT path since commits c6688ef9f297 ("usbip: fix stub_rx: harden
 CMD_SUBMIT path to handle malicious input") and b78d830f0049 ("usbip: fix vudc_rx: harden CMD_SUBMIT path
 to handle malicious input"). The server side validates against USBIP_MAX_ISO_PACKETS because no URB exists
 yet at that point. On the client side we have the original URB, so we can use the tighter bound: the
 response must not exceed the original number_of_packets. This mirrors the existing validation of
 actual_length against transfer_buffer_length in usbip_recv_xbuff(), which checks the response value
 against the original allocation size. Kelvin Mbogo's series ("usb: usbip: fix integer overflow in
 usbip_recv_iso()", v2) hardens the receive-side functions themselves; this patch complements that work by
 catching the bad value at its source -- in usbip_pack_ret_submit() before the overwrite -- and using the
 tighter per-URB allocation bound rather than the global USBIP_MAX_ISO_PACKETS limit. Fix this by checking
 rpdu->number_of_packets against urb->number_of_packets in usbip_pack_ret_submit() before the overwrite. On
 violation, clamp to zero so that usbip_recv_iso() and usbip_pad_iso() safely return early.
 (CVE-2026-31607)

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-2026-31607

Plugin Details

Severity: High

ID: 460568

Version: Revision 1.1

Type: Local

Published: 10/2/2026

Updated: 10/2/2026

Risk Information

VPR

Risk Factor: Medium

Score: 6.5

Percentile: 96.89

CVSS v2

Risk Factor: Critical

Base Score: 10

Temporal Score: 7.4

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

CVSS Score Source: CVE-2026-31607

CVSS v3

Risk Factor: High

Base Score: 7.3

Temporal Score: 6.4

Vector: CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:L/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: 4/24/2026

Reference Information

CVE: CVE-2026-31607