CVE-2026-23253media: dvb-core: fix wrong reinitialization of ringbuffer on reopen
- 7.8HighCVSS base score
- 0.16%Exploitation in 30 daysEPSS · top 95% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- NonePublic exploitsnone known yet
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.
Timeline
ID reserved
By Linux
- 2 months later
· 2 months later
Published
- 7 months later
· 7 months later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| LinuxCNA (assigner) | 3.1 | High7.8 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |
| NVDNVD · Modified | 3.1 | High7.8 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |
- EPSS (exploitation in 30 days)
- 0.16% · top 95% of all CVEs (15 Nov 2026)
- CISA SSVC
- Exploitation: none · Automatable: no · Technical impact: total
The list uses the assigner's score when there is one, then CISA's, then NVD's: High 7.8.
Affected products
- affected 34731df288a5ffe4b0c396caf8cd24c6a710a222 – < 527cfa8a3486b3555c5c15e2f62be484a11398dc
- affected 34731df288a5ffe4b0c396caf8cd24c6a710a222 – < fb378cf89be434ed1f10ab79cc4788fba8ae868d
- affected 34731df288a5ffe4b0c396caf8cd24c6a710a222 – < f1e520ca2e83ece6731af6167c9e5e16931ecba0
- affected 34731df288a5ffe4b0c396caf8cd24c6a710a222 – < af050ab44fa1b1897a940d7d756e512232f5e5df
- affected 34731df288a5ffe4b0c396caf8cd24c6a710a222 – < d71781bad59b1c9d60d7068004581f9bf19c0c9d
- affected 34731df288a5ffe4b0c396caf8cd24c6a710a222 – < cfd94642025e6f71c8f754bdec0800ee95e4f3dd
- affected 34731df288a5ffe4b0c396caf8cd24c6a710a222 – < 32eb8e4adc207ef31bc6e5ae56bab940b0176066
- affected 34731df288a5ffe4b0c396caf8cd24c6a710a222 – < bfbc0b5b32a8f28ce284add619bf226716a59bc0
- affected 2.6.17
- unaffected < 2.6.17
- unaffected 5.10.253 – ≤ 5.10.*
- unaffected 5.15.203 – ≤ 5.15.*
- unaffected 6.1.167 – ≤ 6.1.*
- unaffected 6.6.130 – ≤ 6.6.*
- unaffected 6.12.77 – ≤ 6.12.*
- unaffected 6.18.17 – ≤ 6.18.*
- unaffected 6.19.7 – ≤ 6.19.*
- unaffected 7.0 – ≤ *
References
References9
- https://git.kernel.org/stable/c/527cfa8a3486b3555c5c15e2f62be484a11398dc (opens in a new tab)
- https://git.kernel.org/stable/c/fb378cf89be434ed1f10ab79cc4788fba8ae868d (opens in a new tab)
- https://git.kernel.org/stable/c/f1e520ca2e83ece6731af6167c9e5e16931ecba0 (opens in a new tab)
- https://git.kernel.org/stable/c/af050ab44fa1b1897a940d7d756e512232f5e5df (opens in a new tab)
- https://git.kernel.org/stable/c/d71781bad59b1c9d60d7068004581f9bf19c0c9d (opens in a new tab)
- https://git.kernel.org/stable/c/cfd94642025e6f71c8f754bdec0800ee95e4f3dd (opens in a new tab)
- https://git.kernel.org/stable/c/32eb8e4adc207ef31bc6e5ae56bab940b0176066 (opens in a new tab)
- https://git.kernel.org/stable/c/bfbc0b5b32a8f28ce284add619bf226716a59bc0 (opens in a new tab)
- https://cert-portal.siemens.com/productcert/html/ssa-784472.html (opens in a new tab)
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- EUVD EUVD-2026-12860 (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://cveledger.app/cve/CVE-2026-23253)Record last updated .