CVE-2025-38001
MEDIUMLinux Kernel 5.0.1-6.15.0 Use-After-Free and Infinite Loop via HFSC and NETEM
Title source: llmExploitation Summary
EIP tracks 5 public exploits for CVE-2025-38001. PoCs published by 0xdevil, khoatran107, aexdyhaxor.
AI-analyzed exploit summary This is a Linux kernel exploit for CVE-2025-38001, targeting a use-after-free vulnerability in the HFSC (Hierarchical Fair Service Curve) qdisc implementation. The exploit leverages RBTree manipulations to achieve arbitrary code execution, with support for multiple kernel versions including LTS 6.6 and COS 6.1.
Description
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/?id=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/netdev/8DuRWwfqjoRDLDmBMlIfbrsZg9Gx50DHJc1ilxsEBNe2D6NMoigR_eIRIG0LOjMc3r10nUUZtArXx4oZBIdUfZQrwjcQhdinnMis_0G7VEk=@willsroot.io/T/#u
Exploits (5)
This is a Linux kernel exploit for CVE-2025-38001, targeting a use-after-free vulnerability in the HFSC (Hierarchical Fair Service Curve) qdisc implementation. The exploit leverages RBTree manipulations to achieve arbitrary code execution, with support for multiple kernel versions including LTS 6.6 and COS 6.1.
This repository contains a proof-of-concept exploit for CVE-2025-38001, targeting a vulnerability in the Linux kernel's HFSC (Hierarchical Fair Service Curve) scheduler. The exploit appears to focus on a memory corruption or logic flaw in the `hfsc_class` structure, particularly around the `cl_nactive` field.
This repository contains a functional exploit for CVE-2025-38001, targeting a use-after-free vulnerability in the Linux Kernel's HFSC (Hierarchical Fair Service Curve) RBTree implementation. The exploit demonstrates privilege escalation by manipulating kernel memory structures to achieve root access.
This repository provides a working proof-of-concept exploit for CVE-2025-41744, which involves the use of a default cryptographic key in Sprecher Automation SPRECON-E-C devices. The exploit includes tools to intercept and decrypt network traffic using the hardcoded AES-256 key.
References (12)
Scores
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H