CVE-2025-37953 (GCVE-0-2025-37953)
Vulnerability from cvelistv5 – Published: 2025-05-20 16:01 – Updated: 2026-05-11 21:18
VLAI
EPSS
VEX
Title
sch_htb: make htb_deactivate() idempotent
Summary
In the Linux kernel, the following vulnerability has been resolved:
sch_htb: make htb_deactivate() idempotent
Alan reported a NULL pointer dereference in htb_next_rb_node()
after we made htb_qlen_notify() idempotent.
It turns out in the following case it introduced some regression:
htb_dequeue_tree():
|-> fq_codel_dequeue()
|-> qdisc_tree_reduce_backlog()
|-> htb_qlen_notify()
|-> htb_deactivate()
|-> htb_next_rb_node()
|-> htb_deactivate()
For htb_next_rb_node(), after calling the 1st htb_deactivate(), the
clprio[prio]->ptr could be already set to NULL, which means
htb_next_rb_node() is vulnerable here.
For htb_deactivate(), although we checked qlen before calling it, in
case of qlen==0 after qdisc_tree_reduce_backlog(), we may call it again
which triggers the warning inside.
To fix the issues here, we need to:
1) Make htb_deactivate() idempotent, that is, simply return if we
already call it before.
2) Make htb_next_rb_node() safe against ptr==NULL.
Many thanks to Alan for testing and for the reproducer.
Severity
5.5 (Medium)
Assigner
References
9 references
Impacted products
2 products
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| Linux | Linux |
Affected:
e6b45f4de763b00dc1c55e685e2dd1aaf525d3c1 , < 99ff8a20fd61315bf9ae627440a5ff07d22ee153
(git)
Affected: 32ae12ce6a9f6bace186ca7335220ff59b6cc3cd , < a9945f7cf1709adc5d2d31cb6cfc85627ce299a8 (git) Affected: 967955c9e57f8eebfccc298037d4aaf3d42bc1c9 , < c2d25fddd867ce20a266806634eeeb5c30cb520c (git) Affected: 73cf6af13153d62f9b76eff422eea79dbc70f15e , < c928dd4f6bf0c25c72b11824a1e9ac9bd37296a0 (git) Affected: bbbf5e0f87078b715e7a665d662a2c0e77f044ae , < 31ff70ad39485698cf779f2078132d80b57f6c07 (git) Affected: 0a188c0e197383683fd093ab1ea6ce9a5869a6ea , < 98cd7ed92753090a714f0802d4434314526fe61d (git) Affected: a61f1b5921761fbaf166231418bc1db301e5bf59 , < c4792b9e38d2f61b07eac72f10909fa76130314b (git) Affected: 5ba8b837b522d7051ef81bacf3d95383ff8edce5 , < 3769478610135e82b262640252d90f6efb05be71 (git) |
guessed | |
| Linux | Linux |
Affected:
6.1.138 , < 6.1.139
(semver)
Affected: 6.6.90 , < 6.6.91 (semver) Affected: 6.12.28 , < 6.12.29 (semver) Affected: 6.14.6 , < 6.14.7 (semver) |
guessed |
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"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nsch_htb: make htb_deactivate() idempotent\n\nAlan reported a NULL pointer dereference in htb_next_rb_node()\nafter we made htb_qlen_notify() idempotent.\n\nIt turns out in the following case it introduced some regression:\n\nhtb_dequeue_tree():\n |-\u003e fq_codel_dequeue()\n |-\u003e qdisc_tree_reduce_backlog()\n |-\u003e htb_qlen_notify()\n |-\u003e htb_deactivate()\n |-\u003e htb_next_rb_node()\n |-\u003e htb_deactivate()\n\nFor htb_next_rb_node(), after calling the 1st htb_deactivate(), the\nclprio[prio]-\u003eptr could be already set to NULL, which means\nhtb_next_rb_node() is vulnerable here.\n\nFor htb_deactivate(), although we checked qlen before calling it, in\ncase of qlen==0 after qdisc_tree_reduce_backlog(), we may call it again\nwhich triggers the warning inside.\n\nTo fix the issues here, we need to:\n\n1) Make htb_deactivate() idempotent, that is, simply return if we\n already call it before.\n2) Make htb_next_rb_node() safe against ptr==NULL.\n\nMany thanks to Alan for testing and for the reproducer."
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"status": "final",
"title": "kernel: Linux kernel: sch_htb NULL pointer dereference",
"url": "https://security.access.redhat.com/data/csaf/v2/vex/2025/cve-2025-37953.json",
"version": "3"
},
"suse_vex": {
"aggregate_severity": "moderate",
"current_release_date": "2026-08-28T17:03:37Z",
"cve": "CVE-2025-37953",
"id": "CVE-2025-37953",
"initial_release_date": "2025-05-21T00:46:27Z",
"product_status:known_not_affected": "244",
"product_status:recommended": "668",
"source": "SUSE CSAF VEX",
"status": "interim",
"title": "SUSE CVE CVE-2025-37953",
"url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2025-37953.json",
"version": "50"
}
}
}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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Related by attack behaviour
Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.
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