CVE-2023-53219 (GCVE-0-2023-53219)
Vulnerability from cvelistv5 – Published: 2025-09-15 14:21 – Updated: 2026-08-05 09:13
VLAI
EPSS
VEX
Title
media: netup_unidvb: fix use-after-free at del_timer()
Summary
In the Linux kernel, the following vulnerability has been resolved:
media: netup_unidvb: fix use-after-free at del_timer()
When Universal DVB card is detaching, netup_unidvb_dma_fini()
uses del_timer() to stop dma->timeout timer. But when timer
handler netup_unidvb_dma_timeout() is running, del_timer()
could not stop it. As a result, the use-after-free bug could
happen. The process is shown below:
(cleanup routine) | (timer routine)
| mod_timer(&dev->tx_sim_timer, ..)
netup_unidvb_finidev() | (wait a time)
netup_unidvb_dma_fini() | netup_unidvb_dma_timeout()
del_timer(&dma->timeout); |
| ndev->pci_dev->dev //USE
Fix by changing del_timer() to del_timer_sync().
Severity
7.8 (High)
SSVC
Exploitation: none
Automatable: no
Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-01-14 17:49 UTC
CWE
- CWE-416 - Use After Free
Assigner
References
8 references
Impacted products
2 products
| Vendor | Product | Version | |
|---|---|---|---|
| Linux | Linux |
Affected:
52b1eaf4c59a3bbd07afbb4ab4f43418a807d02e , < dd5c77814f290b353917df329f36de1472d47154
(git)
Affected: 52b1eaf4c59a3bbd07afbb4ab4f43418a807d02e , < 90229e9ee957d4514425e4a4d82c50ab5d57ac4d (git) Affected: 52b1eaf4c59a3bbd07afbb4ab4f43418a807d02e , < 1550bcf2983ae1220cc8ab899a39a423fa7cb523 (git) Affected: 52b1eaf4c59a3bbd07afbb4ab4f43418a807d02e , < f9982db735a8495eee14267cf193c806b957e942 (git) Affected: 52b1eaf4c59a3bbd07afbb4ab4f43418a807d02e , < 051af3f0b7d1cd8ab7f3e2523ad8ae1af44caba3 (git) Affected: 52b1eaf4c59a3bbd07afbb4ab4f43418a807d02e , < 07821524f67bf920342bc84ae8b3dea2a315a89e (git) Affected: 52b1eaf4c59a3bbd07afbb4ab4f43418a807d02e , < c8f9c05e1ebcc9c7bc211cc8b74d8fb86a8756fc (git) Affected: 52b1eaf4c59a3bbd07afbb4ab4f43418a807d02e , < 0f5bb36bf9b39a2a96e730bf4455095b50713f63 (git) |
|
| Linux | Linux |
Affected:
4.3
Unaffected: 0 , < 4.3 (semver) Unaffected: 4.14.316 , ≤ 4.14.* (semver) Unaffected: 4.19.284 , ≤ 4.19.* (semver) Unaffected: 5.4.244 , ≤ 5.4.* (semver) Unaffected: 5.10.181 , ≤ 5.10.* (semver) Unaffected: 5.15.113 , ≤ 5.15.* (semver) Unaffected: 6.1.30 , ≤ 6.1.* (semver) Unaffected: 6.3.4 , ≤ 6.3.* (semver) Unaffected: 6.4 , ≤ * (original_commit_for_fix) |
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}
],
"id": "CVE-2023-53219",
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"vulnStatus": "Modified",
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"lang": "en",
"value": "CWE-416"
}
],
"source": "nvd@nist.gov",
"type": "Primary"
},
{
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"value": "CWE-416"
}
],
"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"type": "Secondary"
}
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}
},
"redhat_vex": {
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"current_release_date": "2026-06-30T10:32:18+00:00",
"cve": "CVE-2023-53219",
"id": "CVE-2023-53219",
"initial_release_date": "2023-01-01T00:00:00+00:00",
"product_status:known_not_affected": "274",
"source": "Red Hat CSAF VEX",
"status": "final",
"title": "kernel: media: netup_unidvb: fix use-after-free at del_timer()",
"url": "https://security.access.redhat.com/data/csaf/v2/vex/2023/cve-2023-53219.json",
"version": "3"
},
"vulnrichment": {
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"metrics": [
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"version": "3.1"
}
},
{
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"content": {
"id": "CVE-2023-53219",
"options": [
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},
{
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},
{
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}
],
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"version": "2.0.3"
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}
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"problemTypes": [
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"descriptions": [
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"lang": "en",
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}
]
}
],
"providerMetadata": {
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"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"shortName": "CISA-ADP"
},
"title": "CISA ADP Vulnrichment"
}
],
"cna": {
"affected": [
{
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"product": "Linux",
"programFiles": [
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],
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}
],
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},
"scenarios": [
{
"lang": "en",
"value": "AV:L - The UAF is reached only through the PCI remove path (netup_unidvb_finidev \u2192 netup_unidvb_dma_fini) on a system with the NetUP PCIe DVB card bound; that is a local driver unbind/unload (or local hot-remove) path, not a network or USB-plug attack surface.\nAC:L - An attacker who keeps queuing DVB buffers (mod_timer in netup_unidvb_buf_queue) while triggering remove controls both sides of the del_timer vs. running netup_unidvb_dma_timeout race and can retry until the handler overlaps teardown; this matches guidance that attacker-controlled races score AC:L.\nPR:L - Triggering remove is via local driver unbind/module unload on an already-present card, scored Low consistent with other remove-cleanup CVEs (e.g. CVE-2023-53225) and the rule to prefer higher severity; DVB/vb2 buffer queueing that arms the timer is also reachable to ordinary video-group users.\nUI:N - The attacker initiates streaming and driver removal themselves; no separate victim action such as opening attacker-supplied content is required.\nS:U - The freed netup_unidvb_dev / embedded netup_dma and timer_list are ordinary kernel heap objects in the same security authority; there is no VM, IOMMU, or sandbox boundary crossed.\nC:H - Use-after-free of ndev/dma (dma-\u003endev, pci_dev, buffer lists) after kfree(ndev) allows a groomed reallocation to be read back through the still-running timeout handler, which per UAF guidance is Confidentiality High.\nI:H - The handler takes dma-\u003elock and mutates free_buffers via list_del/vb2_buffer_done on freed memory, and the timer_list itself lives inside the freed object\u2014heap-spray UAF primitives for arbitrary write/control-flow hijack, scored Integrity High.\nA:H - A use-after-free timer firing against freed dma/ndev reliably causes kernel oops/panic even when not fully exploited, which is Availability High."
}
]
}
],
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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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