Linux Kernel up to 6.12.1 ALSA snd_card_free_when_closed infinite loop

CVSS Meta Temp Score
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CTI Interest Score
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5.5$0-$5k0.00

Summaryinfo

A vulnerability marked as critical has been reported in Linux Kernel up to 6.12.1. The impacted element is the function snd_card_free_when_closed of the component ALSA. Performing a manipulation results in infinite loop. This vulnerability is identified as CVE-2024-56532. There is not any exploit available. It is suggested to upgrade the affected component.

Detailsinfo

A vulnerability, which was classified as critical, was found in Linux Kernel up to 6.12.1. This affects the function snd_card_free_when_closed of the component ALSA. The manipulation with an unknown input leads to a infinite loop vulnerability. CWE is classifying the issue as CWE-835. The product contains an iteration or loop with an exit condition that cannot be reached, i.e., an infinite loop. This is going to have an impact on availability. The summary by CVE is:

In the Linux kernel, the following vulnerability has been resolved: ALSA: us122l: Use snd_card_free_when_closed() at disconnection The USB disconnect callback is supposed to be short and not too-long waiting. OTOH, the current code uses snd_card_free() at disconnection, but this waits for the close of all used fds, hence it can take long. It eventually blocks the upper layer USB ioctls, which may trigger a soft lockup. An easy workaround is to replace snd_card_free() with snd_card_free_when_closed(). This variant returns immediately while the release of resources is done asynchronously by the card device release at the last close. The loop of us122l->mmap_count check is dropped as well. The check is useless for the asynchronous operation with *_when_closed().

The advisory is shared at git.kernel.org. This vulnerability is uniquely identified as CVE-2024-56532 since 12/27/2024. The exploitability is told to be easy. Technical details are known, but no exploit is available.

The vulnerability scanner Nessus provides a plugin with the ID 216224 (Oracle Linux 7 / 8 : Unbreakable Enterprise kernel (ELSA-2025-20100)), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 4.19.325, 5.4.287, 5.10.231, 5.15.174, 6.1.120, 6.6.64, 6.11.11 or 6.12.2 eliminates this vulnerability. Applying the patch 020cbc4d7414f0962004213e2b7bc5cc607e9ec7/75f418b249d84021865eaa59515d3ed9b75ce4d6/bf0aa35a7cb8602cccf2387712114e836f65c154/9a48bd2184b142c92a4e17eac074c61fcf975bc9/bc778ad3e495333eebda36fe91d5b2c93109cc16/2938dd2648522336133c151dd67bb9bf01cbd390/9b27924dc8d7f8a8c35e521287d4ccb9a006e597/9d5c530e4d70f64b1114f2cc29ac690ba7ac4a38/b7df09bb348016943f56b09dcaafe221e3f73947 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 (216224) and CERT Bund (WID-SEC-2024-3762). If you want to get the best quality for vulnerability data then you always have to consider VulDB.

Affected

  • Debian Linux
  • Amazon Linux 2
  • Red Hat Enterprise Linux
  • Ubuntu Linux
  • SUSE Linux
  • Oracle Linux
  • RESF Rocky Linux
  • Dell NetWorker
  • Dell Avamar
  • Red Hat OpenShift
  • IBM QRadar SIEM
  • Dell PowerProtect Data Domain
  • Open Source Linux Kernel
  • IBM DataPower Gateway
  • Dell Secure Connect Gateway

Productinfo

Type

Vendor

Name

Version

License

Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 5.7
VulDB Meta Temp Score: 5.5

VulDB Base Score: 5.7
VulDB Temp Score: 5.5
VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv2info

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

Exploitinginfo

Class: Infinite loop
CWE: CWE-835 / CWE-404
CAPEC: 🔍
ATT&CK: 🔍

Physical: No
Local: No
Remote: Partially

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Nessus ID: 216224
Nessus Name: Oracle Linux 7 / 8 : Unbreakable Enterprise kernel (ELSA-2025-20100)

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔍

Upgrade: Kernel 4.19.325/5.4.287/5.10.231/5.15.174/6.1.120/6.6.64/6.11.11/6.12.2
Patch: 020cbc4d7414f0962004213e2b7bc5cc607e9ec7/75f418b249d84021865eaa59515d3ed9b75ce4d6/bf0aa35a7cb8602cccf2387712114e836f65c154/9a48bd2184b142c92a4e17eac074c61fcf975bc9/bc778ad3e495333eebda36fe91d5b2c93109cc16/2938dd2648522336133c151dd67bb9bf01cbd390/9b27924dc8d7f8a8c35e521287d4ccb9a006e597/9d5c530e4d70f64b1114f2cc29ac690ba7ac4a38/b7df09bb348016943f56b09dcaafe221e3f73947

Timelineinfo

12/27/2024 🔍
12/27/2024 +0 days 🔍
12/27/2024 +0 days 🔍
12/15/2025 +353 days 🔍

Sourcesinfo

Vendor: kernel.org

Advisory: git.kernel.org
Status: Confirmed

CVE: CVE-2024-56532 (🔍)
GCVE (CVE): GCVE-0-2024-56532
GCVE (VulDB): GCVE-100-289461
CERT Bund: WID-SEC-2024-3762 - Linux Kernel: Mehrere Schwachstellen ermöglichen Denial of Service

Entryinfo

Created: 12/27/2024 15:34
Updated: 12/15/2025 07:01
Changes: 12/27/2024 15:34 (59), 02/13/2025 16:23 (2), 07/24/2025 05:39 (7), 10/14/2025 04:29 (1), 12/15/2025 07:01 (1)
Complete: 🔍
Cache ID: 216::103

If you want to get the best quality for vulnerability data then you always have to consider VulDB.

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