netem: Update sch->q.qlen before qdisc_tree_reduce_backlog() (Linux Linux)

CVE-2025-21703
HIGH 7.8

En bref

Source
NVD
EPSS
EPSS 0.30 % · centile 23 ()
État
PUBLISHED
Publiée
Mise à jour
Attribuée par
Linux
Statut NVD
Modified

Description

In the Linux kernel, the following vulnerability has been resolved: netem: Update sch->q.qlen before qdisc_tree_reduce_backlog() qdisc_tree_reduce_backlog() notifies parent qdisc only if child qdisc becomes empty, therefore we need to reduce the backlog of the child qdisc before calling it. Otherwise it would miss the opportunity to call cops->qlen_notify(), in the case of DRR, it resulted in UAF since DRR uses ->qlen_notify() to maintain its active list.

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:HCISA-ADP
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 · 134c704f-9b21-4f2e-91b3-4a467353bcc0 (Secondary)

Références européennes

Avis du CERT-FR

Configurations affectées (CPE NVD)

Produits affectés

ProduitVersions
Linux · Linuxaffected 83c6ab12f08dcc09d4c5ac86fdb89736b28f1d31 < e395fec75ac2dbffc99b4bce57b7f1f3c5449f2c ; affected 216509dda290f6db92c816dd54b83c1df9da9e76 < 7f31d74fcc556a9166b1bb20515542de7bb939d1 ; affected c2047b0e216c8edce227d7c42f99ac2877dad0e4 < 98a2c685293aae122f688cde11d9334dddc5d207 ; affected 10df49cfca73dfbbdb6c4150d859f7e8926ae427 < 7b79ca9a1de6a428d486ff52fb3d602321c08f55 ; affected 3824c5fad18eeb7abe0c4fc966f29959552dca3e < 1f8e3f4a4b8b90ad274dfbc66fc7d55cb582f4d5 ; affected 356078a5c55ec8d2061fcc009fb8599f5b0527f9 < 6312555249082d6d8cc5321ff725df05482d8b83
Linux · Linuxaffected 6.13 ; unaffected 0 < 6.13 ; unaffected 5.4.291 ≤ 5.4.* ; unaffected 5.10.235 ≤ 5.10.* ; unaffected 5.15.179 ≤ 5.15.* ; unaffected 6.1.129 ≤ 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