CVE-2026-23253 (GCVE-0-2026-23253)
Vulnerability from cvelistv5 – Published: 2026-03-18 17:01 – Updated: 2026-08-05 12:20
VLAI
EPSS
VEX
Title
media: dvb-core: fix wrong reinitialization of ringbuffer on reopen
Summary
In the Linux kernel, the following vulnerability has been resolved:
media: dvb-core: fix wrong reinitialization of ringbuffer on reopen
dvb_dvr_open() calls dvb_ringbuffer_init() when a new reader opens the
DVR device. dvb_ringbuffer_init() calls init_waitqueue_head(), which
reinitializes the waitqueue list head to empty.
Since dmxdev->dvr_buffer.queue is a shared waitqueue (all opens of the
same DVR device share it), this orphans any existing waitqueue entries
from io_uring poll or epoll, leaving them with stale prev/next pointers
while the list head is reset to {self, self}.
The waitqueue and spinlock in dvr_buffer are already properly
initialized once in dvb_dmxdev_init(). The open path only needs to
reset the buffer data pointer, size, and read/write positions.
Replace the dvb_ringbuffer_init() call in dvb_dvr_open() with direct
assignment of data/size and a call to dvb_ringbuffer_reset(), which
properly resets pread, pwrite, and error with correct memory ordering
without touching the waitqueue or spinlock.
Severity
7.8 (High)
Assigner
References
8 references
Impacted products
2 products
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| Linux | Linux |
Affected:
34731df288a5ffe4b0c396caf8cd24c6a710a222 , < 527cfa8a3486b3555c5c15e2f62be484a11398dc
(git)
Affected: 34731df288a5ffe4b0c396caf8cd24c6a710a222 , < fb378cf89be434ed1f10ab79cc4788fba8ae868d (git) Affected: 34731df288a5ffe4b0c396caf8cd24c6a710a222 , < f1e520ca2e83ece6731af6167c9e5e16931ecba0 (git) Affected: 34731df288a5ffe4b0c396caf8cd24c6a710a222 , < af050ab44fa1b1897a940d7d756e512232f5e5df (git) Affected: 34731df288a5ffe4b0c396caf8cd24c6a710a222 , < d71781bad59b1c9d60d7068004581f9bf19c0c9d (git) Affected: 34731df288a5ffe4b0c396caf8cd24c6a710a222 , < cfd94642025e6f71c8f754bdec0800ee95e4f3dd (git) Affected: 34731df288a5ffe4b0c396caf8cd24c6a710a222 , < 32eb8e4adc207ef31bc6e5ae56bab940b0176066 (git) Affected: 34731df288a5ffe4b0c396caf8cd24c6a710a222 , < bfbc0b5b32a8f28ce284add619bf226716a59bc0 (git) |
guessed | |
| Linux | Linux |
Affected:
2.6.17
Unaffected: 0 , < 2.6.17 (semver) Unaffected: 5.10.253 , ≤ 5.10.* (semver) Unaffected: 5.15.203 , ≤ 5.15.* (semver) Unaffected: 6.1.167 , ≤ 6.1.* (semver) Unaffected: 6.6.130 , ≤ 6.6.* (semver) Unaffected: 6.12.77 , ≤ 6.12.* (semver) Unaffected: 6.18.17 , ≤ 6.18.* (semver) Unaffected: 6.19.7 , ≤ 6.19.* (semver) Unaffected: 7.0 , ≤ * (original_commit_for_fix) |
guessed |
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"value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nmedia: dvb-core: corrige la reinicializaci\u00f3n incorrecta del b\u00fafer circular al reabrir\n\ndvb_dvr_open() llama a dvb_ringbuffer_init() cuando un nuevo lector abre el dispositivo DVR. dvb_ringbuffer_init() llama a init_waitqueue_head(), lo que reinicializa la cabecera de la lista de la cola de espera a vac\u00eda.\n\nDado que dmxdev-\u0026gt;dvr_buffer.queue es una cola de espera compartida (todas las aperturas del mismo dispositivo DVR la comparten), esto deja hu\u00e9rfanas las entradas existentes de la cola de espera de io_uring poll o epoll, dej\u00e1ndolas con punteros prev/next obsoletos mientras la cabecera de la lista se restablece a {self, self}.\n\nLa cola de espera y el spinlock en dvr_buffer ya est\u00e1n correctamente inicializados una vez en dvb_dmxdev_init(). La ruta de apertura solo necesita restablecer el puntero de datos del b\u00fafer, el tama\u00f1o y las posiciones de lectura/escritura.\n\nReemplace la llamada a dvb_ringbuffer_init() en dvb_dvr_open() con la asignaci\u00f3n directa de datos/tama\u00f1o y una llamada a dvb_ringbuffer_reset(), que restablece correctamente pread, pwrite y error con el ordenamiento de memoria correcto sin tocar la cola de espera o el spinlock."
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"id": "CVE-2026-23253",
"lastModified": "2026-06-17T10:21:11.537",
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"attackVector": "LOCAL",
"availabilityImpact": "HIGH",
"baseScore": 7.8,
"baseSeverity": "HIGH",
"confidentialityImpact": "HIGH",
"integrityImpact": "HIGH",
"privilegesRequired": "LOW",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
"version": "3.1"
},
"exploitabilityScore": 1.8,
"impactScore": 5.9,
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"type": "Secondary"
}
]
},
"published": "2026-03-18T18:16:23.383",
"references": [
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"tags": [
"Patch"
],
"url": "https://git.kernel.org/stable/c/32eb8e4adc207ef31bc6e5ae56bab940b0176066"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"tags": [
"Patch"
],
"url": "https://git.kernel.org/stable/c/527cfa8a3486b3555c5c15e2f62be484a11398dc"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"tags": [
"Patch"
],
"url": "https://git.kernel.org/stable/c/af050ab44fa1b1897a940d7d756e512232f5e5df"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"tags": [
"Patch"
],
"url": "https://git.kernel.org/stable/c/bfbc0b5b32a8f28ce284add619bf226716a59bc0"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"tags": [
"Patch"
],
"url": "https://git.kernel.org/stable/c/cfd94642025e6f71c8f754bdec0800ee95e4f3dd"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"tags": [
"Patch"
],
"url": "https://git.kernel.org/stable/c/d71781bad59b1c9d60d7068004581f9bf19c0c9d"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"tags": [
"Patch"
],
"url": "https://git.kernel.org/stable/c/f1e520ca2e83ece6731af6167c9e5e16931ecba0"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"tags": [
"Patch"
],
"url": "https://git.kernel.org/stable/c/fb378cf89be434ed1f10ab79cc4788fba8ae868d"
}
],
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"vulnStatus": "Analyzed",
"weaknesses": [
{
"description": [
{
"lang": "en",
"value": "NVD-CWE-noinfo"
}
],
"source": "nvd@nist.gov",
"type": "Primary"
}
]
}
},
"redhat_vex": {
"aggregate_severity": "Moderate",
"current_release_date": "2026-07-03T14:40:09+00:00",
"cve": "CVE-2026-23253",
"id": "CVE-2026-23253",
"initial_release_date": "2026-03-18T00:00:00+00:00",
"product_status:known_affected": "76",
"product_status:known_not_affected": "198",
"source": "Red Hat CSAF VEX",
"status": "final",
"title": "kernel: Kernel: Denial of Service via DVB DVR ringbuffer reinitialization flaw",
"url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-23253.json",
"version": "3"
}
}
}
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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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