CVE-2025-38000 (GCVE-0-2025-38000)

Vulnerability from cvelistv5 – Published: 2025-06-06 13:03 – Updated: 2026-05-11 21:19
VLAI
Title
sch_hfsc: Fix qlen accounting bug when using peek in hfsc_enqueue()
Summary
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.
Severity
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 12d0ad3be9c3854e52ec74bb83bb6f43612827c7 , < 1034e3310752e8675e313f7271b348914008719a (git)
Affected: 12d0ad3be9c3854e52ec74bb83bb6f43612827c7 , < f9f593e34d2fb67644372c8f7b033bdc622ad228 (git)
Affected: 12d0ad3be9c3854e52ec74bb83bb6f43612827c7 , < 89c301e929a0db14ebd94b4d97764ce1d6981653 (git)
Affected: 12d0ad3be9c3854e52ec74bb83bb6f43612827c7 , < f1dde3eb17dc1b8bd07aed00004b1e05fc87a3d4 (git)
Affected: 12d0ad3be9c3854e52ec74bb83bb6f43612827c7 , < 93c276942e75de0e5bc91576300d292e968f5a02 (git)
Affected: 12d0ad3be9c3854e52ec74bb83bb6f43612827c7 , < 49b21795b8e5654a7df3d910a12e1060da4c04cf (git)
Affected: 12d0ad3be9c3854e52ec74bb83bb6f43612827c7 , < 3f3a22eebbc32b4fa8ce9c1d5f9db214b45b9335 (git)
Affected: 12d0ad3be9c3854e52ec74bb83bb6f43612827c7 , < 3f981138109f63232a5fb7165938d4c945cc1b9d (git)
Create a notification for this product.
Linux Linux Affected: 4.8
Unaffected: 0 , < 4.8 (semver)
Unaffected: 5.4.294 , ≤ 5.4.* (semver)
Unaffected: 5.10.238 , ≤ 5.10.* (semver)
Unaffected: 5.15.185 , ≤ 5.15.* (semver)
Unaffected: 6.1.141 , ≤ 6.1.* (semver)
Unaffected: 6.6.93 , ≤ 6.6.* (semver)
Unaffected: 6.12.31 , ≤ 6.12.* (semver)
Unaffected: 6.14.9 , ≤ 6.14.* (semver)
Unaffected: 6.15 , ≤ * (original_commit_for_fix)
Create a notification for this product.
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This\\ncan leave an empty HFSC class in the active list, causing further\\nconsequences like use-after-free.\\n\\nThis patch fixes the bug by moving the increment of sch-\u003eq.qlen and\\nsch-\u003eqstats.backlog before the call to the child qdisc\u0027s peek() operation.\\nThis ensures that queue length and backlog are always accurate when packet\\ndrops or dequeues are triggered during the peek.\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: sch_hfsc: Se corrige el error de contabilidad de qlen al usar peek en hfsc_enqueue(). Al encolar el primer paquete en una clase HFSC, hfsc_enqueue() llama a la operaci\u00f3n peek() de la qdisc secundaria antes de incrementar sch-\u0026gt;q.qlen y sch-\u0026gt;qstats.backlog. Si la qdisc secundaria usa qdisc_peek_dequeued(), esto puede desencadenar una desencola inmediata y una posible p\u00e9rdida de paquetes. 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  }
}


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