{"id":"CVE-2026-23253","revision":null,"records":[{"revision":"c99a6a3c18014ca3a31c7ddf8f9a2654","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-23253","aliases":[],"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":0,"publishedAt":"2026-03-18T17:01:44.126+00:00","modifiedAt":"2026-10-19T18:35:40.421+00:00","affected":[{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n \"product\": \"Linux\",\n \"vendor\": \"Linux\",\n \"defaultStatus\": \"unaffected\",\n \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n \"programFiles\": [\n \"drivers/media/dvb-core/dmxdev.c\"\n ],\n \"versions\": [\n {\n \"version\": \"34731df288a5ffe4b0c396caf8cd24c6a710a222\",\n \"lessThan\": \"527cfa8a3486b3555c5c15e2f62be484a11398dc\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"34731df288a5ffe4b0c396caf8cd24c6a710a222\",\n \"lessThan\": \"fb378cf89be434ed1f10ab79cc4788fba8ae868d\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"34731df288a5ffe4b0c396caf8cd24c6a710a222\",\n \"lessThan\": \"f1e520ca2e83ece6731af6167c9e5e16931ecba0\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"34731df288a5ffe4b0c396caf8cd24c6a710a222\",\n \"lessThan\": \"af050ab44fa1b1897a940d7d756e512232f5e5df\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"34731df288a5ffe4b0c396caf8cd24c6a710a222\",\n \"lessThan\": \"d71781bad59b1c9d60d7068004581f9bf19c0c9d\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"34731df288a5ffe4b0c396caf8cd24c6a710a222\",\n \"lessThan\": \"cfd94642025e6f71c8f754bdec0800ee95e4f3dd\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"34731df288a5ffe4b0c396caf8cd24c6a710a222\",\n \"lessThan\": \"32eb8e4adc207ef31bc6e5ae56bab940b0176066\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"34731df288a5ffe4b0c396caf8cd24c6a710a222\",\n \"lessThan\": \"bfbc0b5b32a8f28ce284add619bf226716a59bc0\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n }\n ]\n }"},{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n \"product\": \"Linux\",\n \"vendor\": \"Linux\",\n \"defaultStatus\": \"affected\",\n \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n \"programFiles\": [\n \"drivers/media/dvb-core/dmxdev.c\"\n ],\n \"versions\": [\n {\n \"version\": \"2.6.17\",\n \"status\": \"affected\"\n },\n {\n \"version\": \"0\",\n \"lessThan\": \"2.6.17\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"5.10.253\",\n \"lessThanOrEqual\": \"5.10.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"5.15.203\",\n \"lessThanOrEqual\": \"5.15.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.1.167\",\n \"lessThanOrEqual\": \"6.1.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.6.130\",\n \"lessThanOrEqual\": \"6.6.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.12.77\",\n \"lessThanOrEqual\": \"6.12.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.18.17\",\n \"lessThanOrEqual\": \"6.18.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.19.7\",\n \"lessThanOrEqual\": \"6.19.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"7.0\",\n \"lessThanOrEqual\": \"*\",\n \"status\": \"unaffected\",\n \"versionType\": \"original_commit_for_fix\"\n }\n ]\n }"}],"metrics":[{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","score":7.8,"severity":"HIGH"}],"references":["https://git.kernel.org/stable/c/527cfa8a3486b3555c5c15e2f62be484a11398dc","https://git.kernel.org/stable/c/fb378cf89be434ed1f10ab79cc4788fba8ae868d","https://git.kernel.org/stable/c/f1e520ca2e83ece6731af6167c9e5e16931ecba0","https://git.kernel.org/stable/c/af050ab44fa1b1897a940d7d756e512232f5e5df","https://git.kernel.org/stable/c/d71781bad59b1c9d60d7068004581f9bf19c0c9d","https://git.kernel.org/stable/c/cfd94642025e6f71c8f754bdec0800ee95e4f3dd","https://git.kernel.org/stable/c/32eb8e4adc207ef31bc6e5ae56bab940b0176066","https://git.kernel.org/stable/c/bfbc0b5b32a8f28ce284add619bf226716a59bc0"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-23253","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-23253","identifiers":["CVE-2026-23253"]},"retained":false,"historicalAffected":[]}],"coverage":[{"source":"cisa-kev:global","scope":"Complete CISA KEV catalog; all vendors. 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