media: dvb-core: fix wrong reinitialization of ringbuffer on reopen_CVE-2026-23253

{
    "lastseen": "",
    "description": "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->dvr_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.",
    "published": "2026-03-18T17:01:44.126Z",
    "modified": "2026-04-02T14:44:00.996Z",
    "type": "cve",
    "title": "media: dvb-core: fix wrong reinitialization of ringbuffer on reopen",
    "source": "Linux",
    "references": "https://git.kernel.org/stable/c/f1e520ca2e83ece6731af6167c9e5e16931ecba0\nhttps://git.kernel.org/stable/c/af050ab44fa1b1897a940d7d756e512232f5e5df\nhttps://git.kernel.org/stable/c/d71781bad59b1c9d60d7068004581f9bf19c0c9d\nhttps://git.kernel.org/stable/c/cfd94642025e6f71c8f754bdec0800ee95e4f3dd\nhttps://git.kernel.org/stable/c/32eb8e4adc207ef31bc6e5ae56bab940b0176066\nhttps://git.kernel.org/stable/c/bfbc0b5b32a8f28ce284add619bf226716a59bc0",
    "id": "CVE-2026-23253",
    "bulletinFamily": "",
    "cwe": null,
    "cvelist": null,
    "sourceData": "Linux Linux 34731df288a5ffe4b0c396caf8cd24c6a710a222\nLinux Linux 34731df288a5ffe4b0c396caf8cd24c6a710a222\nLinux Linux 34731df288a5ffe4b0c396caf8cd24c6a710a222\nLinux Linux 34731df288a5ffe4b0c396caf8cd24c6a710a222\nLinux Linux 34731df288a5ffe4b0c396caf8cd24c6a710a222\nLinux Linux 34731df288a5ffe4b0c396caf8cd24c6a710a222\nLinux Linux 2.6.17",
    "sourceHref": "",
    "cvss": {
        "score": 7.8,
        "severity": "HIGH",
        "vector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
        "version": "3.1"
    },
    "cvss2": [],
    "cvss3": {
        "version": "",
        "vectorString": "",
        "baseScore": 0,
        "baseSeverity": "",
        "attackVector": "",
        "attackComplexity": "",
        "privilegesRequired": "",
        "userInteraction": "",
        "scope": "",
        "confidentialityImpact": "",
        "integrityImpact": "",
        "availabilityImpact": "",
        "cvssV3": {
            "version": "",
            "vectorString": "",
            "baseScore": 0,
            "baseSeverity": "",
            "attackVector": "",
            "attackComplexity": "",
            "privilegesRequired": "",
            "userInteraction": "",
            "scope": "",
            "confidentialityImpact": "",
            "integrityImpact": "",
            "availabilityImpact": ""
        }
    },
    "href": "",
    "category_name": "CVE",
    "post_link": "",
    "product": "Linux",
    "version": "34731df288a5ffe4b0c396caf8cd24c6a710a222",
    "vendor": "Linux",
    "ai_description": "",
    "ai_severity": "",
    "ai_vendor": "",
    "ai_product": "",
    "ai_version": "",
    "ai_score": 0
}