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Bottlerocket: bottlerocket-kernel-5.15, kernel-5.15: security update to 5.15.178

high Tenable Self-Hosted Container Security Plugin ID 428122

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: sched: sch_cake: add bounds checks to
 host bulk flow fairness counts Even though we fixed a logic error in the commit cited below, syzbot still
 managed to trigger an underflow of the per-host bulk flow counters, leading to an out of bounds memory
 access. To avoid any such logic errors causing out of bounds memory accesses, this commit factors out all
 accesses to the per-host bulk flow counters to a series of helpers that perform bounds-checking before any
 increments and decrements. This also has the benefit of improving readability by moving the conditional
 checks for the flow mode into these helpers, instead of having them spread out throughout the code (which
 was the cause of the original logic error). As part of this change, the flow quantum calculation is
 consolidated into a helper function, which means that the dithering applied to the ost load scaling is now
 applied both in the DRR rotation and when a sparse flow's quantum is first initiated. The only user-
 visible effect of this is that the maximum packet size that can be sent while a flow stays sparse will now
 vary with +/- one byte in some cases. This should not make a noticeable difference in practice, and thus
 it's not worth complicating the code to preserve the old behaviour. (CVE-2025-21647)

Plugin Details

Severity: High

ID: 428122

Version: Revision 1.4

Type: Local

Published: 6/30/2025

Updated: 7/2/2026

Supported Sensors: Tenable Cloud Security, Tenable Self-Hosted Container Security

Risk Information

VPR

Risk Factor: Medium

Score: 4.3

Percentile: 53.06

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-2025-21647

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

Vulnerability Publication Date: 1/19/2025

Reference Information

CVE: CVE-2025-21647