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Google: sys-kernel/csql-kernel-6_1, sys-kernel/csql-kernel-6_6: security update to 18613.263.42

medium Tenable Self-Hosted Container Security Plugin ID 472295

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_sched: hfsc: Address reentrant
 enqueue adding class to eltree twice Savino says: "We are writing to report that this recent patch
 (141d34391abbb315d68556b7c67ad97885407547) [1] can be bypassed, and a UAF can still occur when HFSC is
 utilized with NETEM. The patch only checks the cl->cl_nactive field to determine whether it is the first
 insertion or not [2], but this field is only incremented by init_vf [3]. By using HFSC_RSC (which uses
 init_ed) [4], it is possible to bypass the check and insert the class twice in the eltree. Under normal
 conditions, this would lead to an infinite loop in hfsc_dequeue for the reasons we already explained in
 this report [5]. However, if TBF is added as root qdisc and it is configured with a very low rate, it can
 be utilized to prevent packets from being dequeued. This behavior can be exploited to perform subsequent
 insertions in the HFSC eltree and cause a UAF." To fix both the UAF and the infinite loop, with netem as
 an hfsc child, check explicitly in hfsc_enqueue whether the class is already in the eltree whenever the
 HFSC_RSC flag is set. [1] https://web.git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?i
 d=141d34391abbb315d68556b7c67ad97885407547 [2]
 https://elixir.bootlin.com/linux/v6.15-rc5/source/net/sched/sch_hfsc.c#L1572 [3]
 https://elixir.bootlin.com/linux/v6.15-rc5/source/net/sched/sch_hfsc.c#L677 [4]
 https://elixir.bootlin.com/linux/v6.15-rc5/source/net/sched/sch_hfsc.c#L1574 [5] https://lore.kernel.org/n
 etdev/8DuRWwfqjoRDLDmBMlIfbrsZg9Gx50DHJc1ilxsEBNe2D6NMoigR_eIRIG0LOjMc3r10nUUZtArXx4oZBIdUfZQrwjcQhdinnMis
 [email protected]/T/#u (CVE-2025-38001)

Solution

Update the sys-kernel/csql-kernel-6_1 library and its related packages to version 18613.263.42 or later.

See Also

https://storage.googleapis.com/cos-oval-vulnerability-feed/cos-117.oval.xml.tar.gz

Plugin Details

Severity: Medium

ID: 472295

Version: Revision 1.1

Type: Local

Published: 10/3/2026

Updated: 10/3/2026

Risk Information

VPR

Risk Factor: Medium

Score: 5.8

Percentile: 96.66

Vendor

Vendor Severity: LOW

CVSS v2

Risk Factor: Medium

Base Score: 4.6

Temporal Score: 3.6

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

CVSS Score Source: CVE-2025-38001

CVSS v3

Risk Factor: Medium

Base Score: 5.5

Temporal Score: 5

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

Temporal Vector: CVSS:3.0/E:P/RL:O/RC:C

Vulnerability Information

Exploit Available: true

Exploit Ease: Exploits are available

Vulnerability Publication Date: 6/6/2025

Reference Information

CVE: CVE-2025-38001