Description (CNA)
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 (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected 34731df288a5ffe4b0c396caf8cd24c6a710a222 before 527cfa8a3486b3555c5c15e2f62be484a11398dc; affected 34731df288a5ffe4b0c396caf8cd24c6a710a222 before fb378cf89be434ed1f10ab79cc4788fba8ae868d; affected 34731df288a5ffe4b0c396caf8cd24c6a710a222 before f1e520ca2e83ece6731af6167c9e5e16931ecba0; affected 34731df288a5ffe4b0c396caf8cd24c6a710a222 before af050ab44fa1b1897a940d7d756e512232f5e5df; affected 34731df288a5ffe4b0c396caf8cd24c6a710a222 before d71781bad59b1c9d60d7068004581f9bf19c0c9d; affected 34731df288a5ffe4b0c396caf8cd24c6a710a222 before cfd94642025e6f71c8f754bdec0800ee95e4f3dd; affected 34731df288a5ffe4b0c396caf8cd24c6a710a222 before 32eb8e4adc207ef31bc6e5ae56bab940b0176066; affected 34731df288a5ffe4b0c396caf8cd24c6a710a222 before bfbc0b5b32a8f28ce284add619bf226716a59bc0 |
| Linux / Linux | affected 2.6.17; unaffected 0 before 2.6.17; unaffected 5.10.253 through 5.10.*; unaffected 5.15.203 through 5.15.*; unaffected 6.1.167 through 6.1.*; unaffected 6.6.130 through 6.6.*; unaffected 6.12.77 through 6.12.*; unaffected 6.18.17 through 6.18.*; unaffected 6.19.7 through 6.19.*; unaffected 7.0 through * |
CWE
No CWE identifiers supplied.
References
- https://git.kernel.org/stable/c/527cfa8a3486b3555c5c15e2f62be484a11398dc
- https://git.kernel.org/stable/c/fb378cf89be434ed1f10ab79cc4788fba8ae868d
- https://git.kernel.org/stable/c/f1e520ca2e83ece6731af6167c9e5e16931ecba0
- https://git.kernel.org/stable/c/af050ab44fa1b1897a940d7d756e512232f5e5df
- https://git.kernel.org/stable/c/d71781bad59b1c9d60d7068004581f9bf19c0c9d
- https://git.kernel.org/stable/c/cfd94642025e6f71c8f754bdec0800ee95e4f3dd
- https://git.kernel.org/stable/c/32eb8e4adc207ef31bc6e5ae56bab940b0176066
- https://git.kernel.org/stable/c/bfbc0b5b32a8f28ce284add619bf226716a59bc0
ADP enrichment
No English description supplied.
No English description supplied.
No references supplied.