Vulnerability-Lookup

FKIE_CVE-2026-23253

Vulnerability from fkie_nvd - Published: 2026-03-18 18:16 - Updated: 2026-06-01 14:08

Severity

7.8 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

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.

References

URL	Tags
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/32eb8e4adc207ef31bc6e5ae56bab940b0176066	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/527cfa8a3486b3555c5c15e2f62be484a11398dc	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/af050ab44fa1b1897a940d7d756e512232f5e5df	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/bfbc0b5b32a8f28ce284add619bf226716a59bc0	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/cfd94642025e6f71c8f754bdec0800ee95e4f3dd	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/d71781bad59b1c9d60d7068004581f9bf19c0c9d	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/f1e520ca2e83ece6731af6167c9e5e16931ecba0	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/fb378cf89be434ed1f10ab79cc4788fba8ae868d	Patch

Impacted products

Vendor	Product	Version
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	7.0

JSON

To clipboard

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      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmedia: dvb-core: fix wrong reinitialization of ringbuffer on reopen\n\ndvb_dvr_open() calls dvb_ringbuffer_init() when a new reader opens the\nDVR device.  dvb_ringbuffer_init() calls init_waitqueue_head(), which\nreinitializes the waitqueue list head to empty.\n\nSince dmxdev-\u003edvr_buffer.queue is a shared waitqueue (all opens of the\nsame DVR device share it), this orphans any existing waitqueue entries\nfrom io_uring poll or epoll, leaving them with stale prev/next pointers\nwhile the list head is reset to {self, self}.\n\nThe waitqueue and spinlock in dvr_buffer are already properly\ninitialized once in dvb_dmxdev_init().  The open path only needs to\nreset the buffer data pointer, size, and read/write positions.\n\nReplace the dvb_ringbuffer_init() call in dvb_dvr_open() with direct\nassignment of data/size and a call to dvb_ringbuffer_reset(), which\nproperly resets pread, pwrite, and error with correct memory ordering\nwithout touching the waitqueue or spinlock."
    },
    {
      "lang": "es",
      "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": "2026-06-01T14:08:30.670",
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}

CVE-2026-23253 (GCVE-0-2026-23253)

Vulnerability from cvelistv5 – Published: 2026-03-18 17:01 – Updated: 2026-05-11 22:03

Title

media: dvb-core: fix wrong reinitialization of ringbuffer on reopen

Summary

Severity

7.8 (High)


                        
                          CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Assigner

Linux

References

8 references

URL	Tags
https://git.kernel.org/stable/c/527cfa8a3486b3555…
https://git.kernel.org/stable/c/fb378cf89be434ed1…
https://git.kernel.org/stable/c/f1e520ca2e83ece67…
https://git.kernel.org/stable/c/af050ab44fa1b1897…
https://git.kernel.org/stable/c/d71781bad59b1c9d6…
https://git.kernel.org/stable/c/cfd94642025e6f71c…
https://git.kernel.org/stable/c/32eb8e4adc207ef31…
https://git.kernel.org/stable/c/bfbc0b5b32a8f28ce…

Impacted products

2 products

Vendor	Product	Version
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)
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)

Show details on NVD website

JSON

To clipboard

{
  "containers": {
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      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/media/dvb-core/dmxdev.c"
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmedia: dvb-core: fix wrong reinitialization of ringbuffer on reopen\n\ndvb_dvr_open() calls dvb_ringbuffer_init() when a new reader opens the\nDVR device.  dvb_ringbuffer_init() calls init_waitqueue_head(), which\nreinitializes the waitqueue list head to empty.\n\nSince dmxdev-\u003edvr_buffer.queue is a shared waitqueue (all opens of the\nsame DVR device share it), this orphans any existing waitqueue entries\nfrom io_uring poll or epoll, leaving them with stale prev/next pointers\nwhile the list head is reset to {self, self}.\n\nThe waitqueue and spinlock in dvr_buffer are already properly\ninitialized once in dvb_dmxdev_init().  The open path only needs to\nreset the buffer data pointer, size, and read/write positions.\n\nReplace the dvb_ringbuffer_init() call in dvb_dvr_open() with direct\nassignment of data/size and a call to dvb_ringbuffer_reset(), which\nproperly resets pread, pwrite, and error with correct memory ordering\nwithout touching the waitqueue or spinlock."
        }
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        },
        {
          "url": "https://git.kernel.org/stable/c/cfd94642025e6f71c8f754bdec0800ee95e4f3dd"
        },
        {
          "url": "https://git.kernel.org/stable/c/32eb8e4adc207ef31bc6e5ae56bab940b0176066"
        },
        {
          "url": "https://git.kernel.org/stable/c/bfbc0b5b32a8f28ce284add619bf226716a59bc0"
        }
      ],
      "title": "media: dvb-core: fix wrong reinitialization of ringbuffer on reopen",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-23253",
    "datePublished": "2026-03-18T17:01:44.126Z",
    "dateReserved": "2026-01-13T15:37:45.990Z",
    "dateUpdated": "2026-05-11T22:03:17.093Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

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.

Detection rules are retrieved from Rulezet.

Action not permitted

FKIE_CVE-2026-23253

CVE-2026-23253 (GCVE-0-2026-23253)

Tags

Sightings

Nomenclature