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net_sched: hfsc: Address reentrant enqueue adding class to eltree twice (Linux Linux)

CVE-2025-38001
HIGH 7.8

En bref

Source
NVD
EPSS
EPSS 0.52 % · centile 44 ()
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: net_sched: hfsc: Address reentrant enqueue adding class to eltree twice Savino says: "We are writing to report that this recent patch (141d34391abbb315d68556b7c67ad97885407547) [1] can be bypassed, and a UAF can still occur when HFSC is utilized with NETEM. The patch only checks the cl->cl_nactive field to determine whether it is the first insertion or not [2], but this field is only incremented by init_vf [3]. By using HFSC_RSC (which uses init_ed) [4], it is possible to bypass the check and insert the class twice in the eltree. Under normal conditions, this would lead to an infinite loop in hfsc_dequeue for the reasons we already explained in this report [5]. However, if TBF is added as root qdisc and it is configured with a very low rate, it can be utilized to prevent packets from being dequeued. This behavior can be exploited to perform subsequent insertions in the HFSC eltree and cause a UAF." To fix both the UAF and the infinite loop, with netem as an hfsc child, check explicitly in hfsc_enqueue whether the class is already in the eltree whenever the HFSC_RSC flag is set. [1] https://web.git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=141d34391abbb315d68556b7c67ad97885407547 [2] https://elixir.bootlin.com/linux/v6.15-rc5/source/net/sched/sch_hfsc.c#L1572 [3] https://elixir.bootlin.com/linux/v6.15-rc5/source/net/sched/sch_hfsc.c#L677 [4] https://elixir.bootlin.com/linux/v6.15-rc5/source/net/sched/sch_hfsc.c#L1574 [5] https://lore.kernel.org/netdev/8DuRWwfqjoRDLDmBMlIfbrsZg9Gx50DHJc1ilxsEBNe2D6NMoigR_eIRIG0LOjMc3r10nUUZtArXx4oZBIdUfZQrwjcQhdinnMis_0G7VEk=@willsroot.io/T/#u

Faiblesses (CWE)

  • CWE-835 — Boucle dont la condition de sortie est inatteignable (boucle infinie)

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 3.1MEDIUM 5.5CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:HNVD · nvd@nist.gov (Primary)

Références européennes

Avis du CERT-FR

Configurations affectées (CPE NVD)

Produits affectés

ProduitVersions
Linux · Linuxaffected 37d9cf1a3ce35de3df6f7d209bfb1f50cf188cea < e5bee633cc276410337d54b99f77fbc1ad8801e5 ; affected 37d9cf1a3ce35de3df6f7d209bfb1f50cf188cea < 6672e6c00810056acaac019fe26cdc26fee8a66c ; affected 37d9cf1a3ce35de3df6f7d209bfb1f50cf188cea < 2c928b3a0b04a431ffcd6c8b7d88a267124a3a28 ; affected 37d9cf1a3ce35de3df6f7d209bfb1f50cf188cea < a0ec22fa20b252edbe070a9de8501eef63c17ef5 ; affected 37d9cf1a3ce35de3df6f7d209bfb1f50cf188cea < 295f7c579b07b5b7cf2dffe485f71cc2f27647cb ; affected 37d9cf1a3ce35de3df6f7d209bfb1f50cf188cea < 2f2190ce4ca972051cac6a8d7937448f8cb9673c
Linux · Linuxaffected 5.0 ; unaffected 0 < 5.0 ; 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