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National Vulnerability Database

National Vulnerability Database

NVD

National Vulnerability Database
  1. Vulnerabilities

CVE-2026-23253 Detail

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.


Metrics

 
NVD enrichment efforts reference publicly available information to associate vector strings. CVSS information contributed by other sources is also displayed.
CVSS 4.0 Severity and Vector Strings:

NIST CVSS score
NIST: NVD
N/A
NVD assessment not yet provided.

References to Advisories, Solutions, and Tools

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URL Source(s) Tag(s)
https://git.kernel.org/stable/c/32eb8e4adc207ef31bc6e5ae56bab940b0176066 kernel.org Patch 
https://git.kernel.org/stable/c/527cfa8a3486b3555c5c15e2f62be484a11398dc kernel.org Patch 
https://git.kernel.org/stable/c/af050ab44fa1b1897a940d7d756e512232f5e5df kernel.org Patch 
https://git.kernel.org/stable/c/bfbc0b5b32a8f28ce284add619bf226716a59bc0 kernel.org Patch 
https://git.kernel.org/stable/c/cfd94642025e6f71c8f754bdec0800ee95e4f3dd kernel.org Patch 
https://git.kernel.org/stable/c/d71781bad59b1c9d60d7068004581f9bf19c0c9d kernel.org Patch 
https://git.kernel.org/stable/c/f1e520ca2e83ece6731af6167c9e5e16931ecba0 kernel.org Patch 
https://git.kernel.org/stable/c/fb378cf89be434ed1f10ab79cc4788fba8ae868d kernel.org Patch 

Weakness Enumeration

CWE-ID CWE Name Source
NVD-CWE-noinfo Insufficient Information cwe source acceptance level NIST  

Known Affected Software Configurations Switch to CPE 2.2

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Change History

5 change records found show changes

Quick Info

CVE Dictionary Entry:
CVE-2026-23253
NVD Published Date:
03/18/2026
NVD Last Modified:
06/01/2026
Source:
kernel.org