CVE-2023-52847

Kernel crash via uncanceled device-removal timer

Published May 21, 2024 · Updated Aug 5, 2026

Use-after-free in the Linux bttv driver from 4.15 allows local users to crash the kernel by racing video capture with device removal. The bttv_remove path frees struct bttv without synchronously deleting btv->timeout, so bttv_irq_timeout can later read and modify the freed object. Reachability requires a supported Bt8xx PCI capture device, access to its video node, and the ability to trigger driver unbind, module unload, or hot removal; exploitation can expose or corrupt kernel memory as well as panic the host.

CVSS severity7.8
High
EPSS probability0.19%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Use-after-free in the Linux bttv driver from 4.15 allows local users to crash the kernel by racing video capture with device removal. The bttv_remove path frees struct bttv without synchronously deleting btv->timeout, so bttv_irq_timeout can later read and modify the freed object. Reachability requires a supported Bt8xx PCI capture device, access to its video node, and the ability to trigger driver unbind, module unload, or hot removal; exploitation can expose or corrupt kernel memory as well as panic the host.

The record

CVE
CVE-2023-52847
Published
May 21, 2024
Updated
Aug 5, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-416, CWE-362, T1068
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. May 21, 2024CVE publishedPublication date reported by the CVE source.
  2. Aug 5, 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=162e6376ac58440beb6a2d2ee294f5d88ea58dd1 <1871014d6ef4812ad11ef7d838d73ce09d632267
  2. Affected versionversion=162e6376ac58440beb6a2d2ee294f5d88ea58dd1 <20568d06f6069cb835e05eed432edf962645d226
  3. Affected versionversion=162e6376ac58440beb6a2d2ee294f5d88ea58dd1 <2f3d9198cdae1cb079ec8652f4defacd481eab2b
  4. Affected versionversion=162e6376ac58440beb6a2d2ee294f5d88ea58dd1 <51c94256a83fe4e17406c66ff3e1ad7d242d8574
  5. Affected versionversion=162e6376ac58440beb6a2d2ee294f5d88ea58dd1 <847599fffa528b2cdec4e21b6bf7586dad982132
  6. Affected versionversion=162e6376ac58440beb6a2d2ee294f5d88ea58dd1 <b35fdade92c5058a5e727e233fe263b828de2c9a
  7. Affected versionversion=162e6376ac58440beb6a2d2ee294f5d88ea58dd1 <bbc3b8dd2cb7817e703f112d988e4f4728f0f2a9
  8. Affected versionversion=162e6376ac58440beb6a2d2ee294f5d88ea58dd1 <bd5b50b329e850d467e7bcc07b2b6bde3752fbda
  9. Affected versionversion=4.15

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=162e6376ac58440beb6a2d2ee294f5d88ea58dd1 <1871014d6ef4812ad11ef7d838d73ce09d632267; version=162e6376ac58440beb6a2d2ee294f5d88ea58dd1 <20568d06f6069cb835e05eed432edf962645d226; version=162e6376ac58440beb6a2d2ee294f5d88ea58dd1 <2f3d9198cdae1cb079ec8652f4defacd481eab2b; version=162e6376ac58440beb6a2d2ee294f5d88ea58dd1 <51c94256a83fe4e17406c66ff3e1ad7d242d8574; version=162e6376ac58440beb6a2d2ee294f5d88ea58dd1 <847599fffa528b2cdec4e21b6bf7586dad982132; version=162e6376ac58440beb6a2d2ee294f5d88ea58dd1 <b35fdade92c5058a5e727e233fe263b828de2c9a; version=162e6376ac58440beb6a2d2ee294f5d88ea58dd1 <bbc3b8dd2cb7817e703f112d988e4f4728f0f2a9; version=162e6376ac58440beb6a2d2ee294f5d88ea58dd1 <bd5b50b329e850d467e7bcc07b2b6bde3752fbda; version=4.15

Published CVSS scores

7.8Linux kernel CNACVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
7.0NVDCVSS:3.1/AV:L/AC:H/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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-416Use After Free
CWE-362Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')
T1068Exploitation for Privilege Escalation

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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