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

Quick assessment

Affected
Linux Linux
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于dvb_dvr_open函数错误地重新初始化环形缓冲区等待队列，可能导致等待队列条目损坏。

CVSS 7.8 · High EPSS 0.14% · P3

Possible ATT&CK Techniques 1 AI

T1498 · Network Denial of Service

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux 34731df288a5ffe4b0c396caf8cd24c6a710a222< 527cfa8a3486b3555c5c15e2f62be484a11398dc affected
34731df288a5ffe4b0c396caf8cd24c6a710a222< fb378cf89be434ed1f10ab79cc4788fba8ae868d affected
34731df288a5ffe4b0c396caf8cd24c6a710a222< f1e520ca2e83ece6731af6167c9e5e16931ecba0 affected
34731df288a5ffe4b0c396caf8cd24c6a710a222< af050ab44fa1b1897a940d7d756e512232f5e5df affected
34731df288a5ffe4b0c396caf8cd24c6a710a222< d71781bad59b1c9d60d7068004581f9bf19c0c9d affected
34731df288a5ffe4b0c396caf8cd24c6a710a222< cfd94642025e6f71c8f754bdec0800ee95e4f3dd affected
34731df288a5ffe4b0c396caf8cd24c6a710a222< 32eb8e4adc207ef31bc6e5ae56bab940b0176066 affected
34731df288a5ffe4b0c396caf8cd24c6a710a222< bfbc0b5b32a8f28ce284add619bf226716a59bc0 affected
… +10 more rows
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I. Basic Information for CVE-2026-23253

Vulnerability Information
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Vulnerability Title
media: dvb-core: fix wrong reinitialization of ringbuffer on reopen
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
Vulnerability Title
Linux kernel 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于dvb_dvr_open函数错误地重新初始化环形缓冲区等待队列，可能导致等待队列条目损坏。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Linux Linux 34731df288a5ffe4b0c396caf8cd24c6a710a222 ~ 527cfa8a3486b3555c5c15e2f62be484a11398dc -
Linux Linux 2.6.17 -

II. Public POCs for CVE-2026-23253

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III. Intelligence Information for CVE-2026-23253

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Patches & Fixes for CVE-2026-23253 (6)

Same Patch Batch · Linux · 2026-03-18 · 35 CVEs total

CVE-2026-23246 8.8 HIGH wifi: mac80211: bounds-check link_id in ieee80211_ml_reconfiguration
CVE-2026-23268 7.8 HIGH apparmor: fix unprivileged local user can do privileged policy management
CVE-2026-23270 7.8 HIGH net/sched: Only allow act_ct to bind to clsact/ingress qdiscs and shared blocks
CVE-2026-23248 7.8 HIGH perf/core: Fix refcount bug and potential UAF in perf_mmap
CVE-2026-23243 7.8 HIGH RDMA/umad: Reject negative data_len in ib_umad_write
CVE-2026-23245 7.8 HIGH net/sched: act_gate: snapshot parameters with RCU on replace
CVE-2025-71269 7.5 HIGH btrfs: do not free data reservation in fallback from inline due to -ENOSPC
CVE-2025-71268 7.5 HIGH btrfs: fix reservation leak in some error paths when inserting inline extent
CVE-2026-23242 7.5 HIGH RDMA/siw: Fix potential NULL pointer dereference in header processing
CVE-2026-23269 7.1 HIGH apparmor: validate DFA start states are in bounds in unpack_pdb
CVE-2026-23244 nvme: fix memory allocation in nvme_pr_read_keys()
CVE-2026-23247 tcp: secure_seq: add back ports to TS offset
CVE-2025-71267 fs: ntfs3: fix infinite loop triggered by zero-sized ATTR_LIST
CVE-2026-23249 xfs: check for deleted cursors when revalidating two btrees
CVE-2026-23250 xfs: check return value of xchk_scrub_create_subord
CVE-2026-23251 xfs: only call xf{array,blob}_destroy if we have a valid pointer
CVE-2026-23252 xfs: get rid of the xchk_xfile_*_descr calls
CVE-2025-71266 fs: ntfs3: check return value of indx_find to avoid infinite loop
CVE-2025-71265 fs: ntfs3: fix infinite loop in attr_load_runs_range on inconsistent metadata
CVE-2025-71270 LoongArch: Enable exception fixup for specific ADE subcode

Showing top 20 of 35 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-23253

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