CVE-2025-37797

Katalog CVE

CVSS 7.8 · High EPSS 0,22%

Kerentanan Use After Free pada linux kernel, debian linux. Skor CVSS 3.1 7.8 (High) menurut NVD.

Deskripsi (NVD)

In the Linux kernel, the following vulnerability has been resolved: net_sched: hfsc: Fix a UAF vulnerability in class handling This patch fixes a Use-After-Free vulnerability in the HFSC qdisc class handling. The issue occurs due to a time-of-check/time-of-use condition in hfsc_change_class() when working with certain child qdiscs like netem or codel. The vulnerability works as follows: 1. hfsc_change_class() checks if a class has packets (q.qlen != 0) 2. It then calls qdisc_peek_len(), which for certain qdiscs (e.g., codel, netem) might drop packets and empty the queue 3. The code continues assuming the queue is still non-empty, adding the class to vttree 4. This breaks HFSC scheduler assumptions that only non-empty classes are in vttree 5. Later, when the class is destroyed, this can lead to a Use-After-Free The fix adds a second queue length check after qdisc_peek_len() to verify the queue wasn't emptied.

Rincian

Terbit di NVD

2 Mei 2025

Terakhir diubah

30 Juli 2026

Status NVD

Modified

CVSS 3.1

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

Jenis kelemahan (CWE)

CWE-416: Use After Free

EPSS (30 hari)

0,22% peluang dieksploitasi; lebih tinggi dari 12,1% CVE lain

Produk dan versi terdampak

> Data dari konfigurasi CPE di NVD.

Referensi dan perbaikan

• https://git.kernel.org/stable/c/20d584a33e480ae80d105f43e0e7b56784da41b9 patch
• https://git.kernel.org/stable/c/28b09a067831f7317c3841812276022d6c940677 patch
• https://git.kernel.org/stable/c/39b9095dd3b55d9b2743df038c32138efa34a9de patch
• https://git.kernel.org/stable/c/3aa852e3605000d5c47035c3fc3a986d14ccfa9f patch
• https://git.kernel.org/stable/c/3df275ef0a6ae181e8428a6589ef5d5231e58b5c patch
• https://git.kernel.org/stable/c/86cd4641c713455a4f1c8e54c370c598c2b1cee0 patch
• https://git.kernel.org/stable/c/bb583c88d23b72d8d16453d24856c99bd93dadf5 patch
• https://git.kernel.org/stable/c/fcc8ede663569c704fb00a702973bd6c00373283 patch
• https://lists.debian.org/debian-lts-announce/2025/05/msg00030.html mailing list · advisory pihak ketiga
• https://lists.debian.org/debian-lts-announce/2025/05/msg00045.html mailing list · advisory pihak ketiga