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Echo: linux: security update to 6.12.85-1

high Tenable Self-Hosted Container Security Plugin ID 462062

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: ksmbd: validate response sizes in
 ipc_validate_msg() ipc_validate_msg() computes the expected message size for each response type by adding
 (or multiplying) attacker-controlled fields from the daemon response to a fixed struct size in unsigned
 int arithmetic. Three cases can overflow: KSMBD_EVENT_RPC_REQUEST: msg_sz = sizeof(struct
 ksmbd_rpc_command) + resp->payload_sz; KSMBD_EVENT_SHARE_CONFIG_REQUEST: msg_sz = sizeof(struct
 ksmbd_share_config_response) + resp->payload_sz; KSMBD_EVENT_LOGIN_REQUEST_EXT: msg_sz = sizeof(struct
 ksmbd_login_response_ext) + resp->ngroups * sizeof(gid_t); resp->payload_sz is __u32 and resp->ngroups is
 __s32. Each addition can wrap in unsigned int; the multiplication by sizeof(gid_t) mixes signed and
 size_t, so a negative ngroups is converted to SIZE_MAX before the multiply. A wrapped value of msg_sz that
 happens to equal entry->msg_sz bypasses the size check on the next line, and downstream consumers
 (smb2pdu.c:6742 memcpy using rpc_resp->payload_sz, kmemdup in ksmbd_alloc_user using resp_ext->ngroups)
 then trust the unverified length. Use check_add_overflow() on the RPC_REQUEST and SHARE_CONFIG_REQUEST
 paths to detect integer overflow without constraining functional payload size; userspace ksmbd-tools grows
 NDR responses in 4096-byte chunks for calls like NetShareEnumAll, so a hard transport cap is unworkable on
 the response side. For LOGIN_REQUEST_EXT, reject resp->ngroups outside the signed [0, NGROUPS_MAX] range
 up front and report the error from ipc_validate_msg() so it fires at the IPC boundary; with that bound the
 subsequent multiplication and addition stay well below UINT_MAX. The now-redundant ngroups check and
 pr_err in ksmbd_alloc_user() are removed. This is the response-side analogue of aab98e2dbd64 ("ksmbd: fix
 integer overflows on 32 bit systems"), which hardened the request side. (CVE-2026-31707)

Solution

Update the linux library and its related packages to version 6.12.85-1 or later.

See Also

https://advisory.echohq.com/cve/CVE-2026-31707

Plugin Details

Severity: High

ID: 462062

Version: Revision 1.1

Type: Local

Published: 10/2/2026

Updated: 10/2/2026

Risk Information

VPR

Risk Factor: Medium

Score: 4.3

Percentile: 53.62

CVSS v2

Risk Factor: Medium

Base Score: 6.2

Temporal Score: 4.6

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

CVSS Score Source: CVE-2026-31707

CVSS v3

Risk Factor: High

Base Score: 7.1

Temporal Score: 6.2

Vector: CVSS:3.0/AV:L/AC:L/PR:L/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: 5/2/2026

Vulnerability Publication Date: 5/1/2026

Reference Information

CVE: CVE-2026-31707