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field is only\n incremented by init_vf [3].\n\n By using HFSC_RSC (which uses init_ed) [4], it is possible to bypass the\n check and insert the class twice in the eltree.\n Under normal conditions, this would lead to an infinite loop in\n hfsc_dequeue for the reasons we already explained in this report [5].\n\n However, if TBF is added as root qdisc and it is configured with a\n very low rate,\n it can be utilized to prevent packets from being dequeued.\n This behavior can be exploited to perform subsequent insertions in the\n HFSC eltree and cause a UAF.\"\n\nTo fix both the UAF and the infinite loop, with netem as an hfsc child,\ncheck explicitly in hfsc_enqueue whether the class is already in the eltree\nwhenever the HFSC_RSC flag is set.\n\n[1] https://web.git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=141d34391abbb315d68556b7c67ad97885407547\n[2] https://elixir.bootlin.com/linux/v6.15-rc5/source/net/sched/sch_hfsc.c#L1572\n[3] 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"matchCriteriaId": "46D69DCC-AE4D-4EA5-861C-D60951444C6C", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet_sched: hfsc: Address reentrant enqueue adding class to eltree twice\n\nSavino says:\n \"We are writing to report that this recent patch\n (141d34391abbb315d68556b7c67ad97885407547) [1]\n can be bypassed, and a UAF can still occur when HFSC is utilized with\n NETEM.\n\n The patch only checks the cl->cl_nactive field to determine whether\n it is the first insertion or not [2], but this field is only\n incremented by init_vf [3].\n\n By using HFSC_RSC (which uses init_ed) [4], it is possible to bypass the\n check and insert the class twice in the eltree.\n Under normal conditions, this would lead to an infinite loop in\n hfsc_dequeue for the reasons we already explained in this report [5].\n\n However, if TBF is added as root qdisc and it is configured with a\n very low rate,\n it can be utilized to prevent packets from being dequeued.\n This behavior can be exploited to perform subsequent insertions in the\n HFSC eltree and cause a UAF.\"\n\nTo fix both the UAF and the infinite loop, with netem as an hfsc child,\ncheck explicitly in hfsc_enqueue whether the class is already in the eltree\nwhenever the HFSC_RSC flag is set.\n\n[1] https://web.git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=141d34391abbb315d68556b7c67ad97885407547\n[2] https://elixir.bootlin.com/linux/v6.15-rc5/source/net/sched/sch_hfsc.c#L1572\n[3] https://elixir.bootlin.com/linux/v6.15-rc5/source/net/sched/sch_hfsc.c#L677\n[4] https://elixir.bootlin.com/linux/v6.15-rc5/source/net/sched/sch_hfsc.c#L1574\n[5] https://lore.kernel.org/netdev/8DuRWwfqjoRDLDmBMlIfbrsZg9Gx50DHJc1ilxsEBNe2D6NMoigR_eIRIG0LOjMc3r10nUUZtArXx4oZBIdUfZQrwjcQhdinnMis_0G7VEk=@willsroot.io/T/#u"}, {"lang": "es", "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: net_sched: hfsc: Direcci\u00f3n de cola reentrante que a\u00f1ade clase a eltree dos veces. Savino afirma: \"Les escribimos para informarles que este parche reciente (141d34391abbb315d68556b7c67ad97885407547) [1] se puede omitir, y a\u00fan puede producirse una UAF cuando se utiliza HFSC con NETEM. El parche solo comprueba el campo cl->cl_nactive para determinar si es la primera inserci\u00f3n o no [2], pero este campo solo se incrementa con init_vf [3]. Al usar HFSC_RSC (que utiliza init_ed) [4], es posible omitir la comprobaci\u00f3n e insertar la clase dos veces en eltree. En condiciones normales, esto provocar\u00eda un bucle infinito en hfsc_dequeue por las razones que ya explicamos en este informe [5]. Sin embargo, si TBF se a\u00f1ade como qdisc ra\u00edz y es Configurado con una tasa muy baja, puede utilizarse para evitar que los paquetes se desencolan. Este comportamiento puede aprovecharse para realizar inserciones posteriores en el eltree de HFSC y provocar un UAF. Para solucionar tanto el UAF como el bucle infinito, con netem como elemento secundario de hfsc, compruebe expl\u00edcitamente en hfsc_enqueue si la clase ya est\u00e1 en el eltree cuando se activa el indicador HFSC_RSC. [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"}], "id": "CVE-2025-38001", "lastModified": "2025-12-17T19:17:20.207", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 5.5, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 3.6, "source": "nvd@nist.gov", "type": "Primary"}]}, "published": "2025-06-06T14:15:22.183", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/295f7c579b07b5b7cf2dffe485f71cc2f27647cb"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/2c928b3a0b04a431ffcd6c8b7d88a267124a3a28"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/2f2190ce4ca972051cac6a8d7937448f8cb9673c"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/39ed887b1dd2d6b720f87e86692ac3006cc111c8"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/4e38eaaabfb7fffbb371a51150203e19eee5d70e"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/6672e6c00810056acaac019fe26cdc26fee8a66c"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/a0ec22fa20b252edbe070a9de8501eef63c17ef5"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/ac9fe7dd8e730a103ae4481147395cc73492d786"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/e5bee633cc276410337d54b99f77fbc1ad8801e5"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Third Party Advisory"], "url": "https://lists.debian.org/debian-lts-announce/2025/10/msg00007.html"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Third Party Advisory"], "url": "https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Third Party Advisory"], "url": "https://syst3mfailure.io/rbtree-family-drama/"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-835"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: net_sched: hfsc: Address reentrant enqueue adding class to eltree twice", "id": "2370776", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2370776"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.6", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:L/I:L/A:H", "status": "draft"}, "details": ["In the Linux kernel, the following vulnerability has been resolved:\nnet_sched: hfsc: Address reentrant enqueue adding class to eltree twice\nSavino says:\n\"We are writing to report that this recent patch\n(141d34391abbb315d68556b7c67ad97885407547) [1]\ncan be bypassed, and a UAF can still occur when HFSC is utilized with\nNETEM.\nThe patch only checks the cl->cl_nactive field to determine whether\nit is the first insertion or not [2], but this field is only\nincremented by init_vf [3].\nBy using HFSC_RSC (which uses init_ed) [4], it is possible to bypass the\ncheck and insert the class twice in the eltree.\nUnder normal conditions, this would lead to an infinite loop in\nhfsc_dequeue for the reasons we already explained in this report [5].\nHowever, if TBF is added as root qdisc and it is configured with a\nvery low rate,\nit can be utilized to prevent packets from being dequeued.\nThis behavior can be exploited to perform subsequent insertions in the\nHFSC eltree and cause a UAF.\"\nTo fix both the UAF and the infinite loop, with netem as an hfsc child,\ncheck explicitly in hfsc_enqueue whether the class is already in the eltree\nwhenever the HFSC_RSC flag is set.\n[1] https://web.git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=141d34391abbb315d68556b7c67ad97885407547\n[2] https://elixir.bootlin.com/linux/v6.15-rc5/source/net/sched/sch_hfsc.c#L1572\n[3] https://elixir.bootlin.com/linux/v6.15-rc5/source/net/sched/sch_hfsc.c#L677\n[4] https://elixir.bootlin.com/linux/v6.15-rc5/source/net/sched/sch_hfsc.c#L1574\n[5] https://lore.kernel.org/netdev/8DuRWwfqjoRDLDmBMlIfbrsZg9Gx50DHJc1ilxsEBNe2D6NMoigR_eIRIG0LOjMc3r10nUUZtArXx4oZBIdUfZQrwjcQhdinnMis_0G7VEk=@willsroot.io/T/#u"], "name": "CVE-2025-38001", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Under investigation", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2025-06-06T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2025-38001\nhttps://nvd.nist.gov/vuln/detail/CVE-2025-38001\nhttps://lore.kernel.org/linux-cve-announce/2025060650-CVE-2025-38001-f921@gregkh/T"], "statement": "This patch fixes a use-after-free (UAF) and potential infinite loop vulnerability in the HFSC queuing discipline when used in combination with NETEM. A privileged attacker could repeatedly insert a class into the eltree due to insufficient validation in previous logic, bypassing the protection using the HFSC_RSC flag.", "threat_severity": "Moderate"}

{"created": "2025-06-24T09:44:12.826765+00:00", "updated": "2025-06-24T09:44:12.826812+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}