Detections
Analytics

Echo: linux: security update to 6.1.170-1

high Tenable Cloud Security Plugin ID 464745

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: nfsd: fix heap overflow in NFSv4.0
 LOCK replay cache The NFSv4.0 replay cache uses a fixed 112-byte inline buffer
 (rp_ibuf[NFSD4_REPLAY_ISIZE]) to store encoded operation responses. This size was calculated based on OPEN
 responses and does not account for LOCK denied responses, which include the conflicting lock owner as a
 variable-length field up to 1024 bytes (NFS4_OPAQUE_LIMIT). When a LOCK operation is denied due to a
 conflict with an existing lock that has a large owner, nfsd4_encode_operation() copies the full encoded
 response into the undersized replay buffer via read_bytes_from_xdr_buf() with no bounds check. This
 results in a slab-out-of-bounds write of up to 944 bytes past the end of the buffer, corrupting adjacent
 heap memory. This can be triggered remotely by an unauthenticated attacker with two cooperating NFSv4.0
 clients: one sets a lock with a large owner string, then the other requests a conflicting lock to provoke
 the denial. We could fix this by increasing NFSD4_REPLAY_ISIZE to allow for a full opaque, but that would
 increase the size of every stateowner, when most lockowners are not that large. Instead, fix this by
 checking the encoded response length against NFSD4_REPLAY_ISIZE before copying into the replay buffer. If
 the response is too large, set rp_buflen to 0 to skip caching the replay payload. The status is still
 cached, and the client already received the correct response on the original request. (CVE-2026-31402)

Solution

Update the linux library and its related packages to version 6.1.170-1 or later.

See Also

https://advisory.echohq.com/cve/CVE-2026-31402

Plugin Details

Severity: High

ID: 464745

Version: Revision 1.1

Type: Local

Published: 10/2/2026

Updated: 10/2/2026

Risk Information

VPR

Risk Factor: High

Score: 7.6

Percentile: 98.25

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-2026-31402

CVSS v3

Risk Factor: High

Base Score: 7.8

Temporal Score: 6.8

Vector: CVSS:3.0/AV:L/AC:L/PR:L/UI:N/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: 5/1/2026

Vulnerability Publication Date: 4/3/2026

Reference Information

CVE: CVE-2026-31402