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CVE PROGRAM SOURCE RECORD7.8 High

CVE-2026-23253

media: dvb-core: fix wrong reinitialization of ringbuffer on reopen

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Status
Published
Published
Updated
Assigning organization
Linux

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.

Affected products

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

Linux Linux

Default version status: unaffected

  • 34731df288a5ffe4b0c396caf8cd24c6a710a222 to < 527cfa8a3486b3555c5c15e2f62be484a11398dcaffected
  • 34731df288a5ffe4b0c396caf8cd24c6a710a222 to < fb378cf89be434ed1f10ab79cc4788fba8ae868daffected
  • 34731df288a5ffe4b0c396caf8cd24c6a710a222 to < f1e520ca2e83ece6731af6167c9e5e16931ecba0affected
  • 34731df288a5ffe4b0c396caf8cd24c6a710a222 to < af050ab44fa1b1897a940d7d756e512232f5e5dfaffected
  • 34731df288a5ffe4b0c396caf8cd24c6a710a222 to < d71781bad59b1c9d60d7068004581f9bf19c0c9daffected
  • 34731df288a5ffe4b0c396caf8cd24c6a710a222 to < cfd94642025e6f71c8f754bdec0800ee95e4f3ddaffected
  • 34731df288a5ffe4b0c396caf8cd24c6a710a222 to < 32eb8e4adc207ef31bc6e5ae56bab940b0176066affected
  • 34731df288a5ffe4b0c396caf8cd24c6a710a222 to < bfbc0b5b32a8f28ce284add619bf226716a59bc0affected

Linux Linux

Default version status: affected

  • 2.6.17affected
  • 0 to < 2.6.17unaffected
  • 5.10.253 to ≤ 5.10.*unaffected
  • 5.15.203 to ≤ 5.15.*unaffected
  • 6.1.167 to ≤ 6.1.*unaffected
  • 6.6.130 to ≤ 6.6.*unaffected
  • 6.12.77 to ≤ 6.12.*unaffected
  • 6.18.17 to ≤ 6.18.*unaffected
  • 6.19.7 to ≤ 6.19.*unaffected
  • 7.0 to ≤ *unaffected

References