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sch_hfsc: Fix qlen accounting bug when using peek in hfsc_enqueue() (Linux Linux)

CVE-2025-38000
HIGH 7.8

En bref

Source
NVD
EPSS
EPSS 0.23 % · centile 14 ()
État
PUBLISHED
Publiée
Mise à jour
Attribuée par
Linux
Statut NVD
Modified

Rechercher sur…

Description

In the Linux kernel, the following vulnerability has been resolved: sch_hfsc: Fix qlen accounting bug when using peek in hfsc_enqueue() When enqueuing the first packet to an HFSC class, hfsc_enqueue() calls the child qdisc's peek() operation before incrementing sch->q.qlen and sch->qstats.backlog. If the child qdisc uses qdisc_peek_dequeued(), this may trigger an immediate dequeue and potential packet drop. In such cases, qdisc_tree_reduce_backlog() is called, but the HFSC qdisc's qlen and backlog have not yet been updated, leading to inconsistent queue accounting. This can leave an empty HFSC class in the active list, causing further consequences like use-after-free. This patch fixes the bug by moving the increment of sch->q.qlen and sch->qstats.backlog before the call to the child qdisc's peek() operation. This ensures that queue length and backlog are always accurate when packet drops or dequeues are triggered during the peek.

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 12d0ad3be9c3854e52ec74bb83bb6f43612827c7 < 1034e3310752e8675e313f7271b348914008719a ; affected 12d0ad3be9c3854e52ec74bb83bb6f43612827c7 < f9f593e34d2fb67644372c8f7b033bdc622ad228 ; affected 12d0ad3be9c3854e52ec74bb83bb6f43612827c7 < 89c301e929a0db14ebd94b4d97764ce1d6981653 ; affected 12d0ad3be9c3854e52ec74bb83bb6f43612827c7 < f1dde3eb17dc1b8bd07aed00004b1e05fc87a3d4 ; affected 12d0ad3be9c3854e52ec74bb83bb6f43612827c7 < 93c276942e75de0e5bc91576300d292e968f5a02 ; affected 12d0ad3be9c3854e52ec74bb83bb6f43612827c7 < 49b21795b8e5654a7df3d910a12e1060da4c04cf
Linux · Linuxaffected 4.8 ; unaffected 0 < 4.8 ; unaffected 5.4.294 ≤ 5.4.* ; unaffected 5.10.238 ≤ 5.10.* ; unaffected 5.15.185 ≤ 5.15.* ; unaffected 6.1.141 ≤ 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