{"api_version":"1","generated_at":"2026-04-23T07:00:27+00:00","cve":"CVE-2026-23253","urls":{"html":"https://cve.report/CVE-2026-23253","api":"https://cve.report/api/cve/CVE-2026-23253.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-23253","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-23253"},"summary":{"title":"media: dvb-core: fix wrong reinitialization of ringbuffer on reopen","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.","state":"PUBLISHED","assigner":"Linux","published_at":"2026-03-18 18:16:23","updated_at":"2026-04-18 09:16:15"},"problem_types":[],"metrics":[{"version":"3.1","source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","type":"Secondary","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","data":{"version":"3.1","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","baseScore":7.8,"baseSeverity":"HIGH","attackVector":"LOCAL","attackComplexity":"LOW","privilegesRequired":"LOW","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"HIGH","integrityImpact":"HIGH","availabilityImpact":"HIGH"}},{"version":"3.1","source":"CNA","type":"DECLARED","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","data":{"baseScore":7.8,"baseSeverity":"HIGH","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","version":"3.1"}}],"references":[{"url":"https://git.kernel.org/stable/c/f1e520ca2e83ece6731af6167c9e5e16931ecba0","name":"https://git.kernel.org/stable/c/f1e520ca2e83ece6731af6167c9e5e16931ecba0","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/af050ab44fa1b1897a940d7d756e512232f5e5df","name":"https://git.kernel.org/stable/c/af050ab44fa1b1897a940d7d756e512232f5e5df","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/fb378cf89be434ed1f10ab79cc4788fba8ae868d","name":"https://git.kernel.org/stable/c/fb378cf89be434ed1f10ab79cc4788fba8ae868d","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/d71781bad59b1c9d60d7068004581f9bf19c0c9d","name":"https://git.kernel.org/stable/c/d71781bad59b1c9d60d7068004581f9bf19c0c9d","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/32eb8e4adc207ef31bc6e5ae56bab940b0176066","name":"https://git.kernel.org/stable/c/32eb8e4adc207ef31bc6e5ae56bab940b0176066","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/527cfa8a3486b3555c5c15e2f62be484a11398dc","name":"https://git.kernel.org/stable/c/527cfa8a3486b3555c5c15e2f62be484a11398dc","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/cfd94642025e6f71c8f754bdec0800ee95e4f3dd","name":"https://git.kernel.org/stable/c/cfd94642025e6f71c8f754bdec0800ee95e4f3dd","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/bfbc0b5b32a8f28ce284add619bf226716a59bc0","name":"https://git.kernel.org/stable/c/bfbc0b5b32a8f28ce284add619bf226716a59bc0","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-23253","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-23253","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 34731df288a5ffe4b0c396caf8cd24c6a710a222 527cfa8a3486b3555c5c15e2f62be484a11398dc git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 34731df288a5ffe4b0c396caf8cd24c6a710a222 fb378cf89be434ed1f10ab79cc4788fba8ae868d git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 34731df288a5ffe4b0c396caf8cd24c6a710a222 f1e520ca2e83ece6731af6167c9e5e16931ecba0 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 34731df288a5ffe4b0c396caf8cd24c6a710a222 af050ab44fa1b1897a940d7d756e512232f5e5df git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 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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."}],"metrics":[{"cvssV3_1":{"baseScore":7.8,"baseSeverity":"HIGH","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","version":"3.1"}}],"providerMetadata":{"dateUpdated":"2026-04-18T08:57:26.705Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"references":[{"url":"https://git.kernel.org/stable/c/527cfa8a3486b3555c5c15e2f62be484a11398dc"},{"url":"https://git.kernel.org/stable/c/fb378cf89be434ed1f10ab79cc4788fba8ae868d"},{"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":"2026-04-18T08:57:26.705Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-03-18 18:16:23","lastModifiedDate":"2026-04-18 09:16:15","problem_types":[],"metrics":{"cvssMetricV31":[{"source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","type":"Secondary","cvssData":{"version":"3.1","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","baseScore":7.8,"baseSeverity":"HIGH","attackVector":"LOCAL","attackComplexity":"LOW","privilegesRequired":"LOW","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"HIGH","integrityImpact":"HIGH","availabilityImpact":"HIGH"},"exploitabilityScore":1.8,"impactScore":5.9}]},"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"23253","Ordinal":"1","Title":"media: dvb-core: fix wrong reinitialization of ringbuffer on reo","CVE":"CVE-2026-23253","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"23253","Ordinal":"1","NoteData":"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.","Type":"Description","Title":"media: dvb-core: fix wrong reinitialization of ringbuffer on reo"}]}}}