{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-23253","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","state":"PUBLISHED","assignerShortName":"Linux","dateReserved":"2026-01-13T15:37:45.990Z","datePublished":"2026-03-18T17:01:44.126Z","dateUpdated":"2026-05-11T22:03:17.093Z"},"containers":{"cna":{"providerMetadata":{"orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux","dateUpdated":"2026-05-11T22:03:17.093Z"},"descriptions":[{"lang":"en","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->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":{"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"}}],"affected":[{"product":"Linux","vendor":"Linux","defaultStatus":"unaffected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/media/dvb-core/dmxdev.c"],"versions":[{"version":"34731df288a5ffe4b0c396caf8cd24c6a710a222","lessThan":"527cfa8a3486b3555c5c15e2f62be484a11398dc","status":"affected","versionType":"git"},{"version":"34731df288a5ffe4b0c396caf8cd24c6a710a222","lessThan":"fb378cf89be434ed1f10ab79cc4788fba8ae868d","status":"affected","versionType":"git"},{"version":"34731df288a5ffe4b0c396caf8cd24c6a710a222","lessThan":"f1e520ca2e83ece6731af6167c9e5e16931ecba0","status":"affected","versionType":"git"},{"version":"34731df288a5ffe4b0c396caf8cd24c6a710a222","lessThan":"af050ab44fa1b1897a940d7d756e512232f5e5df","status":"affected","versionType":"git"},{"version":"34731df288a5ffe4b0c396caf8cd24c6a710a222","lessThan":"d71781bad59b1c9d60d7068004581f9bf19c0c9d","status":"affected","versionType":"git"},{"version":"34731df288a5ffe4b0c396caf8cd24c6a710a222","lessThan":"cfd94642025e6f71c8f754bdec0800ee95e4f3dd","status":"affected","versionType":"git"},{"version":"34731df288a5ffe4b0c396caf8cd24c6a710a222","lessThan":"32eb8e4adc207ef31bc6e5ae56bab940b0176066","status":"affected","versionType":"git"},{"version":"34731df288a5ffe4b0c396caf8cd24c6a710a222","lessThan":"bfbc0b5b32a8f28ce284add619bf226716a59bc0","status":"affected","versionType":"git"}]},{"product":"Linux","vendor":"Linux","defaultStatus":"affected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/media/dvb-core/dmxdev.c"],"versions":[{"version":"2.6.17","status":"affected"},{"version":"0","lessThan":"2.6.17","status":"unaffected","versionType":"semver"},{"version":"5.10.253","lessThanOrEqual":"5.10.*","status":"unaffected","versionType":"semver"},{"version":"5.15.203","lessThanOrEqual":"5.15.*","status":"unaffected","versionType":"semver"},{"version":"6.1.167","lessThanOrEqual":"6.1.*","status":"unaffected","versionType":"semver"},{"version":"6.6.130","lessThanOrEqual":"6.6.*","status":"unaffected","versionType":"semver"},{"version":"6.12.77","lessThanOrEqual":"6.12.*","status":"unaffected","versionType":"semver"},{"version":"6.18.17","lessThanOrEqual":"6.18.*","status":"unaffected","versionType":"semver"},{"version":"6.19.7","lessThanOrEqual":"6.19.*","status":"unaffected","versionType":"semver"},{"version":"7.0","lessThanOrEqual":"*","status":"unaffected","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.17","versionEndExcluding":"5.10.253"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.17","versionEndExcluding":"5.15.203"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.17","versionEndExcluding":"6.1.167"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.17","versionEndExcluding":"6.6.130"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.17","versionEndExcluding":"6.12.77"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.17","versionEndExcluding":"6.18.17"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.17","versionEndExcluding":"6.19.7"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.17","versionEndExcluding":"7.0"}]}]}],"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"}}}}