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

Type: advisorySource: Official CVE List1 source record

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.

Announced Source revision 1
Original source ↗

CVE-2026-23253

Primary source · Revision 1

Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.

Security context

Source reference: cve:CVE-2026-23253

Linux

Source reference: /containers/cna/affected/0/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Linux

Source reference: /containers/cna/affected/1/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Structured affected-version data

Original package identities and version rules from this source.

[
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "34731df288a5ffe4b0c396caf8cd24c6a710a222",
        "lessThan": "527cfa8a3486b3555c5c15e2f62be484a11398dc",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "34731df288a5ffe4b0c396caf8cd24c6a710a222",
        "lessThan": "fb378cf89be434ed1f10ab79cc4788fba8ae868d",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "34731df288a5ffe4b0c396caf8cd24c6a710a222",
        "lessThan": "f1e520ca2e83ece6731af6167c9e5e16931ecba0",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "34731df288a5ffe4b0c396caf8cd24c6a710a222",
        "lessThan": "af050ab44fa1b1897a940d7d756e512232f5e5df",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "34731df288a5ffe4b0c396caf8cd24c6a710a222",
        "lessThan": "d71781bad59b1c9d60d7068004581f9bf19c0c9d",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "34731df288a5ffe4b0c396caf8cd24c6a710a222",
        "lessThan": "cfd94642025e6f71c8f754bdec0800ee95e4f3dd",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "34731df288a5ffe4b0c396caf8cd24c6a710a222",
        "lessThan": "32eb8e4adc207ef31bc6e5ae56bab940b0176066",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "34731df288a5ffe4b0c396caf8cd24c6a710a222",
        "lessThan": "bfbc0b5b32a8f28ce284add619bf226716a59bc0",
        "versionType": "git"
      }
    ],
    "programFiles": [
      "drivers/media/dvb-core/dmxdev.c"
    ],
    "defaultStatus": "unaffected"
  },
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "2.6.17"
      },
      {
        "status": "unaffected",
        "version": "0",
        "lessThan": "2.6.17",
        "versionType": "semver"
      },
      {
        "status": "unaffected",
        "version": "5.10.253",
        "versionType": "semver",
        "lessThanOrEqual": "5.10.*"
      },
      {
        "status": "unaffected",
        "version": "5.15.203",
        "versionType": "semver",
        "lessThanOrEqual": "5.15.*"
      },
      {
        "status": "unaffected",
        "version": "6.1.167",
        "versionType": "semver",
        "lessThanOrEqual": "6.1.*"
      },
      {
        "status": "unaffected",
        "version": "6.6.130",
        "versionType": "semver",
        "lessThanOrEqual": "6.6.*"
      },
      {
        "status": "unaffected",
        "version": "6.12.77",
        "versionType": "semver",
        "lessThanOrEqual": "6.12.*"
      },
      {
        "status": "unaffected",
        "version": "6.18.17",
        "versionType": "semver",
        "lessThanOrEqual": "6.18.*"
      },
      {
        "status": "unaffected",
        "version": "6.19.7",
        "versionType": "semver",
        "lessThanOrEqual": "6.19.*"
      },
      {
        "status": "unaffected",
        "version": "7.0",
        "versionType": "original_commit_for_fix",
        "lessThanOrEqual": "*"
      }
    ],
    "programFiles": [
      "drivers/media/dvb-core/dmxdev.c"
    ],
    "defaultStatus": "affected"
  }
]
Related CVEs
CVE-2026-23253

Source reference: /cveMetadata/cveId

Publisher severity

high

Source reference: /containers/cna/metrics

Event
#39829 · Revision 1
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Publisher date
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