Detections
Analytics

Echo: linux: security update to 6.1.170-1

critical Tenable Self-Hosted Container Security Plugin ID 461795

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: net/tls: fix use-after-free in -EBUSY
 error path of tls_do_encryption The -EBUSY handling in tls_do_encryption(), introduced by commit
 859054147318 ("net: tls: handle backlogging of crypto requests"), has a use-after-free due to double
 cleanup of encrypt_pending and the scatterlist entry. When crypto_aead_encrypt() returns -EBUSY, the
 request is enqueued to the cryptd backlog and the async callback tls_encrypt_done() will be invoked upon
 completion. That callback unconditionally restores the scatterlist entry (sge->offset, sge->length) and
 decrements ctx->encrypt_pending. However, if tls_encrypt_async_wait() returns an error, the synchronous
 error path in tls_do_encryption() performs the same cleanup again, double-decrementing encrypt_pending and
 double-restoring the scatterlist. The double-decrement corrupts the encrypt_pending sentinel (initialized
 to 1), making tls_encrypt_async_wait() permanently skip the wait for pending async callbacks. A subsequent
 sendmsg can then free the tls_rec via bpf_exec_tx_verdict() while a cryptd callback is still pending,
 resulting in a use-after-free when the callback fires on the freed record. Fix this by skipping the
 synchronous cleanup when the -EBUSY async wait returns an error, since the callback has already handled
 encrypt_pending and sge restoration. (CVE-2026-31533)

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-2026-31533

Plugin Details

Severity: Critical

ID: 461795

Version: Revision 1.1

Type: Local

Published: 10/2/2026

Updated: 10/2/2026

Risk Information

VPR

Risk Factor: Medium

Score: 6.9

Percentile: 96.92

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-2026-31533

CVSS v3

Risk Factor: Critical

Base Score: 9.8

Temporal Score: 8.5

Vector: CVSS:3.0/AV:N/AC:L/PR:N/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: 4/23/2026

Reference Information

CVE: CVE-2026-31533