High 7.8Published Mar 18, 2026

CVE-2026-23253media: dvb-core: fix wrong reinitialization of ringbuffer on reopen

Updated under an hour ago (Oct 26, 2026, 5:23 PM ET)

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It affects Linux and 2 other products. Add what you run to find out whether that includes you.

No exploitation reported and no EPSS estimate yet.

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Exploited in the last 30 days

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: 7.8 HIGH (v3.1, CNA)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Weakness (CWE): CWE-665
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: Linux
NVD analysis: Modified
Record last updated: Oct 19, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

Linux Linux linux:linux (from the name)	34731df288a5ffe4b0c396caf8cd24c6a710a222 builds before 527cfa8a3486b3555c5c15e2f62be484a11398dc; from 34731df288a5ffe4b0c396caf8cd24c6a710a222 before fb378cf89be434ed1f10ab79cc4788fba8ae868d; from 34731df288a5ffe4b0c396caf8cd24c6a710a222 before f1e520ca2e83ece6731af6167c9e5e16931ecba0; from 34731df288a5ffe4b0c396caf8cd24c6a710a222 before af050ab44fa1b1897a940d7d756e512232f5e5df; from 34731df288a5ffe4b0c396caf8cd24c6a710a222 before d71781bad59b1c9d60d7068004581f9bf19c0c9d; from 34731df288a5ffe4b0c396caf8cd24c6a710a222 before cfd94642025e6f71c8f754bdec0800ee95e4f3dd; 34731df288a5ffe4b0c396caf8cd24c6a710a222 builds before 32eb8e4adc207ef31bc6e5ae56bab940b0176066; from 34731df288a5ffe4b0c396caf8cd24c6a710a222 before bfbc0b5b32a8f28ce284add619bf226716a59bc0	CNA record
Siemens SIMATIC S7-1500 TM MFP - GNU/Linux subsystem siemens:simatic_s7_1500_tm_mfp_gnu_linux_subsystem (from the name)	all versions	CISA ADP
linux linux_kernel linux:linux_kernel	from 2.6.17 before 5.10.253; from 5.11 before 5.15.203; from 5.16 before 6.1.167; from 6.2 before 6.6.130; from 6.7 before 6.12.77; from 6.13 before 6.18.17; from 6.19 before 6.19.7; 7.0	NVD

References

References

https://git.kernel.org/stable/c/527cfa8a3486b3555c5c15e2f62be484a11398dc	patch
https://git.kernel.org/stable/c/fb378cf89be434ed1f10ab79cc4788fba8ae868d	patch
https://git.kernel.org/stable/c/f1e520ca2e83ece6731af6167c9e5e16931ecba0	patch
https://git.kernel.org/stable/c/af050ab44fa1b1897a940d7d756e512232f5e5df	patch
https://git.kernel.org/stable/c/d71781bad59b1c9d60d7068004581f9bf19c0c9d	patch
https://git.kernel.org/stable/c/cfd94642025e6f71c8f754bdec0800ee95e4f3dd	patch
https://git.kernel.org/stable/c/32eb8e4adc207ef31bc6e5ae56bab940b0176066	patch
https://git.kernel.org/stable/c/bfbc0b5b32a8f28ce284add619bf226716a59bc0	patch
https://cert-portal.siemens.com/productcert/html/ssa-784472.html

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.