CVE-2026-23253

Kernel waitqueue corruption via DVR reopen

Published Mar 18, 2026 · Updated Mar 18, 2026

Waitqueue corruption in Linux Kernel allows local users to orphan shared DVB DVR poll entries by reopening the device while polling is active. dvb_dvr_open() passes the shared dmxdev->dvr_buffer queue to dvb_ringbuffer_init(), whose init_waitqueue_head() call empties the list head without removing existing io_uring or epoll entries. Triggering requires access to the same DVB DVR device during an existing poll wait and leaves stale list pointers for subsequent kernel list operations.

CVSS severity7.8
High
EPSS probability0.13%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Waitqueue corruption in Linux Kernel allows local users to orphan shared DVB DVR poll entries by reopening the device while polling is active. dvb_dvr_open() passes the shared dmxdev->dvr_buffer queue to dvb_ringbuffer_init(), whose init_waitqueue_head() call empties the list head without removing existing io_uring or epoll entries. Triggering requires access to the same DVB DVR device during an existing poll wait and leaves stale list pointers for subsequent kernel list operations.

The record

CVE
CVE-2026-23253
Published
Mar 18, 2026
Updated
Mar 18, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
T1068
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Mar 18, 2026CVE publishedPublication date reported by the CVE source.
  2. Mar 18, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=2.6.17
  2. Affected versionversion=34731df288a5ffe4b0c396caf8cd24c6a710a222 <32eb8e4adc207ef31bc6e5ae56bab940b0176066
  3. Affected versionversion=34731df288a5ffe4b0c396caf8cd24c6a710a222 <bfbc0b5b32a8f28ce284add619bf226716a59bc0
  4. Affected versionversion=34731df288a5ffe4b0c396caf8cd24c6a710a222 <cfd94642025e6f71c8f754bdec0800ee95e4f3dd
  5. Affected versionversion=34731df288a5ffe4b0c396caf8cd24c6a710a222 <d71781bad59b1c9d60d7068004581f9bf19c0c9d

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=2.6.17; version=34731df288a5ffe4b0c396caf8cd24c6a710a222 <32eb8e4adc207ef31bc6e5ae56bab940b0176066; version=34731df288a5ffe4b0c396caf8cd24c6a710a222 <bfbc0b5b32a8f28ce284add619bf226716a59bc0; version=34731df288a5ffe4b0c396caf8cd24c6a710a222 <cfd94642025e6f71c8f754bdec0800ee95e4f3dd; version=34731df288a5ffe4b0c396caf8cd24c6a710a222 <d71781bad59b1c9d60d7068004581f9bf19c0c9d

Published CVSS scores

6.2OracleCVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:H
5.5Amazon LinuxCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
7.8kernel.orgCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1068Exploitation for Privilege Escalation

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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