CVE-2026-23253

HIGH EPSS 2.9%
Published Mar 18, 20263mo ago · Modified Jun 17, 20262w ago
7.8 CVSS 3.1
High
Find Similar
Published Mar 18, 2026 3mo ago
Last Modified Jun 17, 2026 2w ago

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 Details

Base Score
7.8
Exploitability
1.8
Impact
5.9
Vector string
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Attack Vector Local
Attack Complexity Low
Privileges Required Low
User Interaction None
Scope Unchanged
Confidentiality High
Integrity High
Availability High

Threat Intelligence

EPSS Exploit Probability
2.9% percentile
Exploit & Patch Status
No Known Exploit
Patch Available

Affected Products 8

VendorProductVersionRange
linuxlinux_kernel*≥2.6.17  –  <5.10.253
linuxlinux_kernel*≥5.11  –  <5.15.203
linuxlinux_kernel*≥5.16  –  <6.1.167
linuxlinux_kernel*≥6.2  –  <6.6.130
linuxlinux_kernel*≥6.7  –  <6.12.77
linuxlinux_kernel*≥6.13  –  <6.18.17
linuxlinux_kernel*≥6.19  –  <6.19.7
linuxlinux_kernel7.0any

References 8

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

Remediation

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