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CVE-2026-23253 PUBLISHED

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.

EPSS 0.03% · 9.2th percentile

Risk Scores

EPSS Score
0.03%
9.2th percentile

Affected Products

VendorProductVersions
linuxlinux_kernel2.6.17, 2.6.17, 2.6.17
LinuxLinux34731df288a5ffe4b0c396caf8cd24c6a710a222, 34731df288a5ffe4b0c396caf8cd24c6a710a222, 2.6.17

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