Linux Kernel up to 6.3.3 media del_timer use after free

CVSS Meta Temp Score
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CTI Interest Score
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7.7$0-$5k0.00

Summaryinfo

A vulnerability, which was classified as critical, was found in Linux Kernel up to 6.3.3. The affected element is the function del_timer of the component media. Executing a manipulation can lead to use after free. This vulnerability appears as CVE-2023-53219. There is no available exploit. You should upgrade the affected component.

Detailsinfo

A vulnerability was found in Linux Kernel up to 6.3.3. It has been declared as critical. This vulnerability affects the function del_timer of the component media. The manipulation with an unknown input leads to a use after free vulnerability. The CWE definition for the vulnerability is CWE-416. Referencing memory after it has been freed can cause a program to crash, use unexpected values, or execute code. As an impact it is known to affect confidentiality, integrity, and availability. CVE summarizes:

In the Linux kernel, the following vulnerability has been resolved: media: netup_unidvb: fix use-after-free at del_timer() When Universal DVB card is detaching, netup_unidvb_dma_fini() uses del_timer() to stop dma->timeout timer. But when timer handler netup_unidvb_dma_timeout() is running, del_timer() could not stop it. As a result, the use-after-free bug could happen. The process is shown below: (cleanup routine) | (timer routine) | mod_timer(&dev->tx_sim_timer, ..) netup_unidvb_finidev() | (wait a time) netup_unidvb_dma_fini() | netup_unidvb_dma_timeout() del_timer(&dma->timeout); | | ndev->pci_dev->dev //USE Fix by changing del_timer() to del_timer_sync().

The advisory is shared for download at git.kernel.org. This vulnerability was named CVE-2023-53219 since 09/15/2025. The exploitation appears to be easy. There are known technical details, but no exploit is available. The current price for an exploit might be approx. USD $0-$5k (estimation calculated on 01/10/2026).

The vulnerability scanner Nessus provides a plugin with the ID 265234 (Linux Distros Unpatched Vulnerability : CVE-2023-53219), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 4.14.316, 4.19.284, 5.4.244, 5.10.181, 5.15.113, 6.1.30 or 6.3.4 eliminates this vulnerability. Applying the patch dd5c77814f290b353917df329f36de1472d47154/90229e9ee957d4514425e4a4d82c50ab5d57ac4d/1550bcf2983ae1220cc8ab899a39a423fa7cb523/f9982db735a8495eee14267cf193c806b957e942/051af3f0b7d1cd8ab7f3e2523ad8ae1af44caba3/07821524f67bf920342bc84ae8b3dea2a315a89e/c8f9c05e1ebcc9c7bc211cc8b74d8fb86a8756fc/0f5bb36bf9b39a2a96e730bf4455095b50713f63 is able to eliminate this problem. The bugfix is ready for download at git.kernel.org. The best possible mitigation is suggested to be upgrading to the latest version.

The vulnerability is also documented in the databases at Tenable (265234) and CERT Bund (WID-SEC-2025-2053). VulDB is the best source for vulnerability data and more expert information about this specific topic.

Affected

  • Debian Linux
  • Amazon Linux 2
  • Red Hat Enterprise Linux
  • Ubuntu Linux
  • SUSE Linux
  • Oracle Linux
  • IBM QRadar SIEM
  • SUSE openSUSE
  • Open Source Linux Kernel
  • RESF Rocky Linux
  • Dell Secure Connect Gateway
  • F5 F5OS

Productinfo

Type

Vendor

Name

Version

License

Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 7.9
VulDB Meta Temp Score: 7.7

VulDB Base Score: 8.0
VulDB Temp Score: 7.6
VulDB Vector: 🔒
VulDB Reliability: 🔍

NVD Base Score: 7.8
NVD Vector: 🔒

CVSSv2info

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Use after free
CWE: CWE-416 / CWE-119
CAPEC: 🔒
ATT&CK: 🔒

Physical: Partially
Local: Yes
Remote: Partially

Availability: 🔒
Status: Not defined

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

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Nessus ID: 265234
Nessus Name: Linux Distros Unpatched Vulnerability : CVE-2023-53219

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: Kernel 4.14.316/4.19.284/5.4.244/5.10.181/5.15.113/6.1.30/6.3.4
Patch: dd5c77814f290b353917df329f36de1472d47154/90229e9ee957d4514425e4a4d82c50ab5d57ac4d/1550bcf2983ae1220cc8ab899a39a423fa7cb523/f9982db735a8495eee14267cf193c806b957e942/051af3f0b7d1cd8ab7f3e2523ad8ae1af44caba3/07821524f67bf920342bc84ae8b3dea2a315a89e/c8f9c05e1ebcc9c7bc211cc8b74d8fb86a8756fc/0f5bb36bf9b39a2a96e730bf4455095b50713f63

Timelineinfo

09/15/2025 Advisory disclosed
09/15/2025 +0 days CVE reserved
09/15/2025 +0 days VulDB entry created
01/10/2026 +117 days VulDB entry last update

Sourcesinfo

Vendor: kernel.org

Advisory: git.kernel.org
Status: Confirmed

CVE: CVE-2023-53219 (🔒)
GCVE (CVE): GCVE-0-2023-53219
GCVE (VulDB): GCVE-100-324088
CERT Bund: WID-SEC-2025-2053 - Linux Kernel: Mehrere Schwachstellen

Entryinfo

Created: 09/15/2025 18:20
Updated: 01/10/2026 22:22
Changes: 09/15/2025 18:20 (59), 09/19/2025 11:29 (2), 12/03/2025 17:20 (11), 12/29/2025 03:14 (7), 01/10/2026 22:22 (1)
Complete: 🔍
Cache ID: 216::103

VulDB is the best source for vulnerability data and more expert information about this specific topic.

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