CVE-2026-23253

Enriched by CISA
 

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.
https://nvd.nist.gov/vuln/detail/CVE-2026-23253

Categories

No category defined

References


 

AFFECTED (from MITRE)

Vendor Product Versions
Linux Linux
  • 34731df288a5ffe4b0c396caf8cd24c6a710a222 < d71781bad59b1c9d60d7068004581f9bf19c0c9d [affected]
  • 34731df288a5ffe4b0c396caf8cd24c6a710a222 < cfd94642025e6f71c8f754bdec0800ee95e4f3dd [affected]
  • 34731df288a5ffe4b0c396caf8cd24c6a710a222 < 32eb8e4adc207ef31bc6e5ae56bab940b0176066 [affected]
  • 34731df288a5ffe4b0c396caf8cd24c6a710a222 < bfbc0b5b32a8f28ce284add619bf226716a59bc0 [affected]
Linux Linux
  • 2.6.17 [affected]
  • < 2.6.17 [unaffected]
  • 6.12.77 ≤ 6.12.* [unaffected]
  • 6.18.17 ≤ 6.18.* [unaffected]
  • 6.19.7 ≤ 6.19.* [unaffected]
  • 7.0-rc2 ≤ * [unaffected]
© 2022 The MITRE Corporation. This work is reproduced and distributed with the permission of The MITRE Corporation.

CPE

cpe start end
Configuration 1
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* >= 2.6.17 < 6.12.77
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* >= 2.6.17 < 6.18.17
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* >= 2.6.17 < 6.19.7
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* >= 2.6.17 < 7.0-rc2

REMEDIATION


EXPLOITS

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Other Nist (github, ...)

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CAPEC

Common Attack Pattern Enumerations and Classifications

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