CVE-2025-38001

Katalog CVE

CVSS 5.5 · Medium EPSS 0,52%

Kerentanan Loop with Unreachable Exit Condition ('Infinite Loop') pada linux kernel, debian linux. Skor CVSS 3.1 5.5 (Medium) menurut NVD.

Deskripsi (NVD)

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

Rincian

Terbit di NVD

6 Juni 2025

Terakhir diubah

30 Juli 2026

Status NVD

Modified

CVSS 3.1

5.5 (Medium), sumber NVD
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H · uraikan di kalkulator

Jenis kelemahan (CWE)

CWE-835: Loop with Unreachable Exit Condition ('Infinite Loop')

EPSS (30 hari)

0,52% peluang dieksploitasi; lebih tinggi dari 42,3% CVE lain

Produk dan versi terdampak

> Data dari konfigurasi CPE di NVD.

Referensi dan perbaikan

• https://git.kernel.org/stable/c/295f7c579b07b5b7cf2dffe485f71cc2f27647cb patch
• https://git.kernel.org/stable/c/2c928b3a0b04a431ffcd6c8b7d88a267124a3a28 patch
• https://git.kernel.org/stable/c/2f2190ce4ca972051cac6a8d7937448f8cb9673c patch
• https://git.kernel.org/stable/c/39ed887b1dd2d6b720f87e86692ac3006cc111c8 patch
• https://git.kernel.org/stable/c/4e38eaaabfb7fffbb371a51150203e19eee5d70e patch
• https://git.kernel.org/stable/c/6672e6c00810056acaac019fe26cdc26fee8a66c patch
• https://git.kernel.org/stable/c/a0ec22fa20b252edbe070a9de8501eef63c17ef5 patch
• https://git.kernel.org/stable/c/ac9fe7dd8e730a103ae4481147395cc73492d786 patch
• https://git.kernel.org/stable/c/e5bee633cc276410337d54b99f77fbc1ad8801e5 patch
• https://syst3mfailure.io/rbtree-family-drama/ advisory pihak ketiga
• https://lists.debian.org/debian-lts-announce/2025/10/msg00007.html advisory pihak ketiga
• https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html advisory pihak ketiga