Vulnerability-Lookup

GHSA-2M3P-78C9-6W3J

Vulnerability from github – Published: 2026-03-18 18:31 – Updated: 2026-03-25 12:30

Details

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.

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{
  "affected": [],
  "aliases": [
    "CVE-2026-23253"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-03-18T18:16:23Z",
    "severity": null
  },
  "details": "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.",
  "id": "GHSA-2m3p-78c9-6w3j",
  "modified": "2026-03-25T12:30:20Z",
  "published": "2026-03-18T18:31:17Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-23253"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/32eb8e4adc207ef31bc6e5ae56bab940b0176066"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/af050ab44fa1b1897a940d7d756e512232f5e5df"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/bfbc0b5b32a8f28ce284add619bf226716a59bc0"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/cfd94642025e6f71c8f754bdec0800ee95e4f3dd"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/d71781bad59b1c9d60d7068004581f9bf19c0c9d"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/f1e520ca2e83ece6731af6167c9e5e16931ecba0"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}

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

Vulnerability from cvelistv5 – Published: 2026-03-18 17:01 – Updated: 2026-03-25 10:20

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

Linux

References

URL

Tags

	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

Vendor

Product

Version

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)

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)

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{
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          "programFiles": [
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            }
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              "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": [
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                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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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."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-03-25T10:20:38.541Z",
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          "url": "https://git.kernel.org/stable/c/af050ab44fa1b1897a940d7d756e512232f5e5df"
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          "url": "https://git.kernel.org/stable/c/32eb8e4adc207ef31bc6e5ae56bab940b0176066"
        },
        {
          "url": "https://git.kernel.org/stable/c/bfbc0b5b32a8f28ce284add619bf226716a59bc0"
        }
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    "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"
}

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.

Action not permitted

GHSA-2M3P-78C9-6W3J

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

Tags

Sightings

Nomenclature