CVE-2025-37890

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 with netem as child qdisc As described in Gerrard's report [1], we have a UAF case when an hfsc class has a netem child qdisc. The crux of the issue is that hfsc is assuming that checking for cl->qdisc->q.qlen == 0 guarantees that it hasn't inserted the class in the vttree or eltree (which is not true for the netem duplicate case). This patch checks the n_active class variable to make sure that the code won't insert the class in the vttree or eltree twice, catering for the reentrant case. [1] https://lore.kernel.org/netdev/CAHcdcOm+03OD2j6R0=YHKqmy=VgJ8xEOKuP6c7mSgnp-TEJJbw@mail.gmail.com/

Rincian

Terbit di NVD

16 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 11,8% CVE lain

Produk dan versi terdampak

> Data dari konfigurasi CPE di NVD.

Referensi dan perbaikan

• https://git.kernel.org/stable/c/141d34391abbb315d68556b7c67ad97885407547 patch
• https://git.kernel.org/stable/c/273bbcfa53541cde38b2003ad88a59b770306421 patch
• https://git.kernel.org/stable/c/2e7093c7a8aba5d4f8809f271488e5babe75e202 patch
• https://git.kernel.org/stable/c/6082a87af4c52f58150d40dec1716011d871ac21 patch
• https://git.kernel.org/stable/c/8df7d37d626430035b413b97cee18396b3450bef patch
• https://git.kernel.org/stable/c/ac39fd4a757584d78ed062d4f6fd913f83bd98b5 patch
• https://git.kernel.org/stable/c/e0cf8ee23e1915431f262a7b2dee0c7a7d699af0 patch
• https://git.kernel.org/stable/c/e3e949a39a91d1f829a4890e7dfe9417ac72e4d0 patch
• https://lists.debian.org/debian-lts-announce/2025/08/msg00010.html mailing list
• https://lists.debian.org/debian-lts-announce/2025/10/msg00007.html mailing list