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Vulnerability record · CVE-2026-23253 · published 18 March 2026

CVE-2026-23253: Linux kernel vulnerability

Linux · Linux Kernel

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.

7.8 CVSS 3.1 High EPSS 0.13% · top 97.9%
7.8CVSS 3.1 base score
0.13%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
8References
17 Jun 2026Last modified by NVD

Description

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.

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://git.kernel.org/stable/c/32eb8e4adc207ef31bc6e5ae56bab940b0176066 Patch
https://git.kernel.org/stable/c/527cfa8a3486b3555c5c15e2f62be484a11398dc Patch
https://git.kernel.org/stable/c/af050ab44fa1b1897a940d7d756e512232f5e5df Patch
https://git.kernel.org/stable/c/bfbc0b5b32a8f28ce284add619bf226716a59bc0 Patch
https://git.kernel.org/stable/c/cfd94642025e6f71c8f754bdec0800ee95e4f3dd Patch
https://git.kernel.org/stable/c/d71781bad59b1c9d60d7068004581f9bf19c0c9d Patch
https://git.kernel.org/stable/c/f1e520ca2e83ece6731af6167c9e5e16931ecba0 Patch
https://git.kernel.org/stable/c/fb378cf89be434ed1f10ab79cc4788fba8ae868d Patch

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Source: NIST National Vulnerability Database (record CVE-2026-23253), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.