Answer in brief
CVE-2025-38000 records a Unknown severity vulnerability in sch_hfsc: Fix qlen accounting bug when using peek in hfsc_enqueue(). The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
Answer in brief
CVE-2025-38000 records a Unknown severity vulnerability in sch_hfsc: Fix qlen accounting bug when using peek in hfsc_enqueue(). The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
A CVSS score is not reported in the current record. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=12d0ad3be9c3854e52ec74bb83bb6f43612827c7 <1034e3310752e8675e313f7271b348914008719a || >=12d0ad3be9c3854e52ec74bb83bb6f43612827c7 <f9f593e34d2fb67644372c8f7b033bdc622ad228 || >=12d0ad3be9c3854e52ec74bb83bb6f43612827c7 <89c301e929a0db14ebd94b4d97764ce1d6981653 || >=12d0ad3be9c3854e52ec74bb83bb6f43612827c7 <f1dde3eb17dc1b8bd07aed00004b1e05fc87a3d4 || >=12d0ad3be9c3854e52ec74bb83bb6f43612827c7 <93c276942e75de0e5bc91576300d292e968f5a02 || >=12d0ad3be9c3854e52ec74bb83bb6f43612827c7 <49b21795b8e5654a7df3d910a12e1060da4c04cf || >=12d0ad3be9c3854e52ec74bb83bb6f43612827c7 <3f3a22eebbc32b4fa8ce9c1d5f9db214b45b9335 || >=12d0ad3be9c3854e52ec74bb83bb6f43612827c7 <3f981138109f63232a5fb7165938d4c945cc1b9d | 1034e3310752e8675e313f7271b348914008719a, f9f593e34d2fb67644372c8f7b033bdc622ad228, 89c301e929a0db14ebd94b4d97764ce1d6981653, f1dde3eb17dc1b8bd07aed00004b1e05fc87a3d4, 93c276942e75de0e5bc91576300d292e968f5a02, 49b21795b8e5654a7df3d910a12e1060da4c04cf, 3f3a22eebbc32b4fa8ce9c1d5f9db214b45b9335, 3f981138109f63232a5fb7165938d4c945cc1b9d |
| Linux/Linuxgeneric | 4.8 | Not reported |
Published upstream
Jun 6, 2025
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Aug 5, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Aug 5, 2026
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.
Quoted source text, attributed separately from HOL analysis.
A CVSS score is not reported in the current record. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=12d0ad3be9c3854e52ec74bb83bb6f43612827c7 <1034e3310752e8675e313f7271b348914008719a || >=12d0ad3be9c3854e52ec74bb83bb6f43612827c7 <f9f593e34d2fb67644372c8f7b033bdc622ad228 || >=12d0ad3be9c3854e52ec74bb83bb6f43612827c7 <89c301e929a0db14ebd94b4d97764ce1d6981653 || >=12d0ad3be9c3854e52ec74bb83bb6f43612827c7 <f1dde3eb17dc1b8bd07aed00004b1e05fc87a3d4 || >=12d0ad3be9c3854e52ec74bb83bb6f43612827c7 <93c276942e75de0e5bc91576300d292e968f5a02 || >=12d0ad3be9c3854e52ec74bb83bb6f43612827c7 <49b21795b8e5654a7df3d910a12e1060da4c04cf || >=12d0ad3be9c3854e52ec74bb83bb6f43612827c7 <3f3a22eebbc32b4fa8ce9c1d5f9db214b45b9335 || >=12d0ad3be9c3854e52ec74bb83bb6f43612827c7 <3f981138109f63232a5fb7165938d4c945cc1b9d | 1034e3310752e8675e313f7271b348914008719a, f9f593e34d2fb67644372c8f7b033bdc622ad228, 89c301e929a0db14ebd94b4d97764ce1d6981653, f1dde3eb17dc1b8bd07aed00004b1e05fc87a3d4, 93c276942e75de0e5bc91576300d292e968f5a02, 49b21795b8e5654a7df3d910a12e1060da4c04cf, 3f3a22eebbc32b4fa8ce9c1d5f9db214b45b9335, 3f981138109f63232a5fb7165938d4c945cc1b9d |
| Linux/Linuxgeneric | 4.8 | Not reported |
Published upstream
Jun 6, 2025
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Aug 5, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Aug 5, 2026
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.
Quoted source text, attributed separately from HOL analysis.