Answer in brief
CVE-2026-23253 records a High severity (CVSS 7.8) vulnerability in media: dvb-core: fix wrong reinitialization of ringbuffer on reopen. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic), Siemens/SIMATIC S7-1500 TM MFP - GNU/Linux subsystem (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 7.8. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Linux/Linux (generic), Linux/Linux (generic), Siemens/SIMATIC S7-1500 TM MFP - GNU/Linux subsystem (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | 2.6.17 | Not reported |
| Linux/Linuxgeneric | >=34731df288a5ffe4b0c396caf8cd24c6a710a222 <527cfa8a3486b3555c5c15e2f62be484a11398dc || >=34731df288a5ffe4b0c396caf8cd24c6a710a222 <fb378cf89be434ed1f10ab79cc4788fba8ae868d || >=34731df288a5ffe4b0c396caf8cd24c6a710a222 <f1e520ca2e83ece6731af6167c9e5e16931ecba0 || >=34731df288a5ffe4b0c396caf8cd24c6a710a222 <af050ab44fa1b1897a940d7d756e512232f5e5df || >=34731df288a5ffe4b0c396caf8cd24c6a710a222 <d71781bad59b1c9d60d7068004581f9bf19c0c9d || >=34731df288a5ffe4b0c396caf8cd24c6a710a222 <cfd94642025e6f71c8f754bdec0800ee95e4f3dd || >=34731df288a5ffe4b0c396caf8cd24c6a710a222 <32eb8e4adc207ef31bc6e5ae56bab940b0176066 || >=34731df288a5ffe4b0c396caf8cd24c6a710a222 <bfbc0b5b32a8f28ce284add619bf226716a59bc0 | 527cfa8a3486b3555c5c15e2f62be484a11398dc, fb378cf89be434ed1f10ab79cc4788fba8ae868d, f1e520ca2e83ece6731af6167c9e5e16931ecba0, af050ab44fa1b1897a940d7d756e512232f5e5df, d71781bad59b1c9d60d7068004581f9bf19c0c9d, cfd94642025e6f71c8f754bdec0800ee95e4f3dd, 32eb8e4adc207ef31bc6e5ae56bab940b0176066, bfbc0b5b32a8f28ce284add619bf226716a59bc0 |
| Siemens/SIMATIC S7-1500 TM MFP - GNU/Linux subsystemgeneric | >=0 <* | * |
Published upstream
Mar 18, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Oct 15, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Oct 15, 2026
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.
Quoted source text, attributed separately from HOL analysis.