net_sched: hfsc: Fix a UAF vulnerability in class with netem as child qdisc (Linux Linux)

CVE-2025-37890
HIGH 7.8

En bref

Source
NVD
EPSS
EPSS 0.22 % · centile 13 ()
État
PUBLISHED
Publiée
Mise à jour
Attribuée par
Linux
Statut NVD
Modified

Description

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/

Faiblesses (CWE)

  • CWE-416 — Utilisation après libération

Références

Scores

VersionScoreVecteurÉvalué par
CVSS 3.1HIGH 7.8CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:HLinux
CVSS 3.1HIGH 7.8CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:HNVD · 416baaa9-dc9f-4396-8d5f-8c081fb06d67 (Secondary)
CVSS 3.1HIGH 7.8CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:HNVD · nvd@nist.gov (Primary)

Références européennes

Avis du CERT-FR

Configurations affectées (CPE NVD)

Produits affectés

ProduitVersions
Linux · Linuxaffected 37d9cf1a3ce35de3df6f7d209bfb1f50cf188cea < 273bbcfa53541cde38b2003ad88a59b770306421 ; affected 37d9cf1a3ce35de3df6f7d209bfb1f50cf188cea < e0cf8ee23e1915431f262a7b2dee0c7a7d699af0 ; affected 37d9cf1a3ce35de3df6f7d209bfb1f50cf188cea < e3e949a39a91d1f829a4890e7dfe9417ac72e4d0 ; affected 37d9cf1a3ce35de3df6f7d209bfb1f50cf188cea < 8df7d37d626430035b413b97cee18396b3450bef ; affected 37d9cf1a3ce35de3df6f7d209bfb1f50cf188cea < 6082a87af4c52f58150d40dec1716011d871ac21 ; affected 37d9cf1a3ce35de3df6f7d209bfb1f50cf188cea < 2e7093c7a8aba5d4f8809f271488e5babe75e202
Linux · Linuxaffected 5.0 ; unaffected 0 < 5.0 ; unaffected 5.4.294 ≤ 5.4.* ; unaffected 5.10.238 ≤ 5.10.* ; unaffected 5.15.182 ≤ 5.15.* ; unaffected 6.1.138 ≤ 6.1.*

Sources

SourceLicence
CVE List (CVEProject cvelistV5)CVE Program Terms of Use
EPSS (FIRST.org)FIRST — attribution requested
ENISA EUVDENISA — reproduction authorised, source acknowledged
CERT-FR (ANSSI)Licence Ouverte / Etalab 2.0
NVD (NIST) via fkie-cad/nvd-json-data-feedsPublic domain — this product uses data from the NVD API but is not endorsed or certified by the NVD