media: dvb-core: fix wrong reinitialization of ringbuffer on reopen
In the Linux kernel, the following vulnerability has been resolved: media: dvb-core: fix wrong reinitialization of ringbuffer on reopen dvb_dvr_open() calls dvb_ringbuffer_init() when a new reader opens the DVR device. dvb_ringbuffer_init() calls init_waitqueue_head(), which reinitializes the waitqueue list head to empty. Since dmxdev->dvr_buffer.queue is a shared waitqueue (all opens of the same DVR device share it), this orphans any existing waitqueue entries from io_uring poll or epoll, leaving them with stale prev/next pointers while the list head is reset to {self, self}. The waitqueue and spinlock in dvr_buffer are already properly initialized once in dvb_dmxdev_init(). The open path only needs to reset the buffer data pointer, size, and read/write positions. Replace the dvb_ringbuffer_init() call in dvb_dvr_open() with direct assignment of data/size and a call to dvb_ringbuffer_reset(), which properly resets pread, pwrite, and error with correct memory ordering without touching the waitqueue or spinlock.
CVE-2026-23253
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: cve:CVE-2026-23253
Linux
Source reference: /containers/cna/affected/0/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Linux
Source reference: /containers/cna/affected/1/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "34731df288a5ffe4b0c396caf8cd24c6a710a222",
"lessThan": "527cfa8a3486b3555c5c15e2f62be484a11398dc",
"versionType": "git"
},
{
"status": "affected",
"version": "34731df288a5ffe4b0c396caf8cd24c6a710a222",
"lessThan": "fb378cf89be434ed1f10ab79cc4788fba8ae868d",
"versionType": "git"
},
{
"status": "affected",
"version": "34731df288a5ffe4b0c396caf8cd24c6a710a222",
"lessThan": "f1e520ca2e83ece6731af6167c9e5e16931ecba0",
"versionType": "git"
},
{
"status": "affected",
"version": "34731df288a5ffe4b0c396caf8cd24c6a710a222",
"lessThan": "af050ab44fa1b1897a940d7d756e512232f5e5df",
"versionType": "git"
},
{
"status": "affected",
"version": "34731df288a5ffe4b0c396caf8cd24c6a710a222",
"lessThan": "d71781bad59b1c9d60d7068004581f9bf19c0c9d",
"versionType": "git"
},
{
"status": "affected",
"version": "34731df288a5ffe4b0c396caf8cd24c6a710a222",
"lessThan": "cfd94642025e6f71c8f754bdec0800ee95e4f3dd",
"versionType": "git"
},
{
"status": "affected",
"version": "34731df288a5ffe4b0c396caf8cd24c6a710a222",
"lessThan": "32eb8e4adc207ef31bc6e5ae56bab940b0176066",
"versionType": "git"
},
{
"status": "affected",
"version": "34731df288a5ffe4b0c396caf8cd24c6a710a222",
"lessThan": "bfbc0b5b32a8f28ce284add619bf226716a59bc0",
"versionType": "git"
}
],
"programFiles": [
"drivers/media/dvb-core/dmxdev.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "2.6.17"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "2.6.17",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "5.10.253",
"versionType": "semver",
"lessThanOrEqual": "5.10.*"
},
{
"status": "unaffected",
"version": "5.15.203",
"versionType": "semver",
"lessThanOrEqual": "5.15.*"
},
{
"status": "unaffected",
"version": "6.1.167",
"versionType": "semver",
"lessThanOrEqual": "6.1.*"
},
{
"status": "unaffected",
"version": "6.6.130",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.12.77",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.18.17",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "6.19.7",
"versionType": "semver",
"lessThanOrEqual": "6.19.*"
},
{
"status": "unaffected",
"version": "7.0",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"drivers/media/dvb-core/dmxdev.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-23253
Source reference:
/cveMetadata/cveId
Publisher severity
high
Source reference: /containers/cna/metrics
- Event
- #39829 · Revision 1
- Added to Heist Feed
- Publisher date