{"id":"CVE-2026-23253","revision":"c99a6a3c18014ca3a31c7ddf8f9a2654","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":[]}