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

Vulnerability from cvelistv5 – Published: 2026-03-18 17:01 – Updated: 2026-03-25 10:20
VLAI?
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 ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 34731df288a5ffe4b0c396caf8cd24c6a710a222 , < f1e520ca2e83ece6731af6167c9e5e16931ecba0 (git)
Affected: 34731df288a5ffe4b0c396caf8cd24c6a710a222 , < af050ab44fa1b1897a940d7d756e512232f5e5df (git)
Affected: 34731df288a5ffe4b0c396caf8cd24c6a710a222 , < d71781bad59b1c9d60d7068004581f9bf19c0c9d (git)
Affected: 34731df288a5ffe4b0c396caf8cd24c6a710a222 , < cfd94642025e6f71c8f754bdec0800ee95e4f3dd (git)
Affected: 34731df288a5ffe4b0c396caf8cd24c6a710a222 , < 32eb8e4adc207ef31bc6e5ae56bab940b0176066 (git)
Affected: 34731df288a5ffe4b0c396caf8cd24c6a710a222 , < bfbc0b5b32a8f28ce284add619bf226716a59bc0 (git)
Create a notification for this product.
    Linux Linux Affected: 2.6.17
Unaffected: 0 , < 2.6.17 (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-rc2 , ≤ * (original_commit_for_fix)
Create a notification for this product.
Show details on NVD website
To clipboard 

{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/media/dvb-core/dmxdev.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "f1e520ca2e83ece6731af6167c9e5e16931ecba0",
              "status": "affected",
              "version": "34731df288a5ffe4b0c396caf8cd24c6a710a222",
              "versionType": "git"
            },
            {
              "lessThan": "af050ab44fa1b1897a940d7d756e512232f5e5df",
              "status": "affected",
              "version": "34731df288a5ffe4b0c396caf8cd24c6a710a222",
              "versionType": "git"
            },
            {
              "lessThan": "d71781bad59b1c9d60d7068004581f9bf19c0c9d",
              "status": "affected",
              "version": "34731df288a5ffe4b0c396caf8cd24c6a710a222",
              "versionType": "git"
            },
            {
              "lessThan": "cfd94642025e6f71c8f754bdec0800ee95e4f3dd",
              "status": "affected",
              "version": "34731df288a5ffe4b0c396caf8cd24c6a710a222",
              "versionType": "git"
            },
            {
              "lessThan": "32eb8e4adc207ef31bc6e5ae56bab940b0176066",
              "status": "affected",
              "version": "34731df288a5ffe4b0c396caf8cd24c6a710a222",
              "versionType": "git"
            },
            {
              "lessThan": "bfbc0b5b32a8f28ce284add619bf226716a59bc0",
              "status": "affected",
              "version": "34731df288a5ffe4b0c396caf8cd24c6a710a222",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/media/dvb-core/dmxdev.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "2.6.17"
            },
            {
              "lessThan": "2.6.17",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.167",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.130",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.77",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.17",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.19.*",
              "status": "unaffected",
              "version": "6.19.7",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.0-rc2",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.1.167",
                  "versionStartIncluding": "2.6.17",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.6.130",
                  "versionStartIncluding": "2.6.17",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.77",
                  "versionStartIncluding": "2.6.17",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.17",
                  "versionStartIncluding": "2.6.17",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.19.7",
                  "versionStartIncluding": "2.6.17",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.0-rc2",
                  "versionStartIncluding": "2.6.17",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "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."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-03-25T10:20:38.541Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/f1e520ca2e83ece6731af6167c9e5e16931ecba0"
        },
        {
          "url": "https://git.kernel.org/stable/c/af050ab44fa1b1897a940d7d756e512232f5e5df"
        },
        {
          "url": "https://git.kernel.org/stable/c/d71781bad59b1c9d60d7068004581f9bf19c0c9d"
        },
        {
          "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": "2026-03-25T10:20:38.541Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "nvd": "{\"cve\":{\"id\":\"CVE-2026-23253\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2026-03-18T18:16:23.383\",\"lastModified\":\"2026-03-25T11:16:20.870\",\"vulnStatus\":\"Awaiting Analysis\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"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.\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/32eb8e4adc207ef31bc6e5ae56bab940b0176066\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/af050ab44fa1b1897a940d7d756e512232f5e5df\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/bfbc0b5b32a8f28ce284add619bf226716a59bc0\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/cfd94642025e6f71c8f754bdec0800ee95e4f3dd\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/d71781bad59b1c9d60d7068004581f9bf19c0c9d\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/f1e520ca2e83ece6731af6167c9e5e16931ecba0\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}


Log in or create an account to share your comment.




Tags
Taxonomy of the tags.




Sightings

Author Source Type Date

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.