Linux Kernel up to 6.2.8 Block Driver snd_card_free file descriptor consumption

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5.0	$0-$5k	0.00

Summaryinfo

A vulnerability described as critical has been identified in Linux Kernel up to 6.2.8. This vulnerability affects the function snd_card_free of the component Block Driver. The manipulation results in file descriptor consumption. This vulnerability is known as CVE-2023-53045. No exploit is available. Upgrading the affected component is recommended.

Detailsinfo

A vulnerability, which was classified as critical, was found in Linux Kernel up to 6.2.8. Affected is the function snd_card_free of the component Block Driver. The manipulation with an unknown input leads to a file descriptor consumption vulnerability. CWE is classifying the issue as CWE-769. This entry has been deprecated because it was a duplicate of CWE-774. All content has been transferred to CWE-774. This is going to have an impact on availability. CVE summarizes:

In the Linux kernel, the following vulnerability has been resolved: usb: gadget: u_audio: don't let userspace block driver unbind In the unbind callback for f_uac1 and f_uac2, a call to snd_card_free() via g_audio_cleanup() will disconnect the card and then wait for all resources to be released, which happens when the refcount falls to zero. Since userspace can keep the refcount incremented by not closing the relevant file descriptor, the call to unbind may block indefinitely. This can cause a deadlock during reboot, as evidenced by the following blocked task observed on my machine: task:reboot state:D stack:0 pid:2827 ppid:569 flags:0x0000000c Call trace: __switch_to+0xc8/0x140 __schedule+0x2f0/0x7c0 schedule+0x60/0xd0 schedule_timeout+0x180/0x1d4 wait_for_completion+0x78/0x180 snd_card_free+0x90/0xa0 g_audio_cleanup+0x2c/0x64 afunc_unbind+0x28/0x60 ... kernel_restart+0x4c/0xac __do_sys_reboot+0xcc/0x1ec __arm64_sys_reboot+0x28/0x30 invoke_syscall+0x4c/0x110 ... The issue can also be observed by opening the card with arecord and then stopping the process through the shell before unbinding: # arecord -D hw:UAC2Gadget -f S32_LE -c 2 -r 48000 /dev/null Recording WAVE '/dev/null' : Signed 32 bit Little Endian, Rate 48000 Hz, Stereo ^Z[1]+ Stopped arecord -D hw:UAC2Gadget -f S32_LE -c 2 -r 48000 /dev/null # echo gadget.0 > /sys/bus/gadget/drivers/configfs-gadget/unbind (observe that the unbind command never finishes) Fix the problem by using snd_card_free_when_closed() instead, which will still disconnect the card as desired, but defer the task of freeing the resources to the core once userspace closes its file descriptor.

The advisory is shared for download at git.kernel.org. This vulnerability is traded as CVE-2023-53045 since 04/16/2025. The exploitability is told to be difficult. There are known technical details, but no exploit is available.

The vulnerability scanner Nessus provides a plugin with the ID 240793 (SUSE SLES12 Security Update : kernel (SUSE-SU-2025:01983-1)), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 4.14.312, 4.19.280, 5.4.240, 5.10.177, 5.15.105, 6.1.22 or 6.2.9 eliminates this vulnerability. Applying the patch 3e016ef2e72da93a2ea7afbb45de1b481b44d761/3256e152b645fc1e788ba44c2d8ced690113e3e6/0eda2004f38d95ef5715d62be884cd344260535b/33f341c1fc60e172a3515c51bdabee11e83d1ee9/b131989797f7287d7fdadb2bababc05a15d44750/3bc7324e4911351e39c54a62e6ca46321cb10faf/43ca70753dfffd517d2af126da28690f8f615605/6c67ed9ad9b83e453e808f9b31a931a20a25629b 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 vulnerability database at Tenable (240793). VulDB is the best source for vulnerability data and more expert information about this specific topic.

Productinfo

Type

• Operating System

Vendor

• Linux

Name

• Kernel

Version

• 4.14.311
• 4.19.279
• 5.4.239
• 5.10.176
• 5.15.104
• 6.1.0
• 6.1.1
• 6.1.2
• 6.1.3
• 6.1.4
• 6.1.5
• 6.1.6
• 6.1.7
• 6.1.8
• 6.1.9
• 6.1.10
• 6.1.11
• 6.1.12
• 6.1.13
• 6.1.14
• 6.1.15
• 6.1.16
• 6.1.17
• 6.1.18
• 6.1.19
• 6.1.20
• 6.1.21
• 6.2.0
• 6.2.1
• 6.2.2
• 6.2.3
• 6.2.4
• 6.2.5
• 6.2.6
• 6.2.7
• 6.2.8

License

• open-source

Website

• Vendor: https://www.kernel.org/

CPE 2.3info

• 🔍
• 🔍
• 🔍

CPE 2.2info

• 🔍
• 🔍
• 🔍

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 5.1
VulDB Meta Temp Score: 5.0

VulDB Base Score: 4.8
VulDB Temp Score: 4.6
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 5.5
NVD Vector: 🔍

CVSSv2info

AV	AC	Au	C	I	A
💳	💳	💳	💳	💳	💳
💳	💳	💳	💳	💳	💳
💳	💳	💳	💳	💳	💳

Vector	Complexity	Authentication	Confidentiality	Integrity	Availability
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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

Exploitinginfo

Class: File descriptor consumption
CWE: CWE-769 / CWE-400 / CWE-404
CAPEC: 🔍
ATT&CK: 🔍

Physical: Partially
Local: Yes
Remote: Partially

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

0-Day	Unlock	Unlock	Unlock	Unlock
Today	Unlock	Unlock	Unlock	Unlock

Nessus ID: 240793
Nessus Name: SUSE SLES12 Security Update : kernel (SUSE-SU-2025:01983-1)

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔍

Upgrade: Kernel 4.14.312/4.19.280/5.4.240/5.10.177/5.15.105/6.1.22/6.2.9
Patch: 3e016ef2e72da93a2ea7afbb45de1b481b44d761/3256e152b645fc1e788ba44c2d8ced690113e3e6/0eda2004f38d95ef5715d62be884cd344260535b/33f341c1fc60e172a3515c51bdabee11e83d1ee9/b131989797f7287d7fdadb2bababc05a15d44750/3bc7324e4911351e39c54a62e6ca46321cb10faf/43ca70753dfffd517d2af126da28690f8f615605/6c67ed9ad9b83e453e808f9b31a931a20a25629b

Timelineinfo

04/16/2025 🔍
05/02/2025 +16 days 🔍
05/02/2025 +0 days 🔍
11/12/2025 +194 days 🔍

Sourcesinfo

Vendor: kernel.org

Advisory: git.kernel.org
Status: Confirmed

CVE: CVE-2023-53045 (🔍)
GCVE (CVE): GCVE-0-2023-53045
GCVE (VulDB): GCVE-100-307200

Entryinfo

Created: 05/02/2025 19:46
Updated: 11/12/2025 18:00
Changes: 05/02/2025 19:46 (59), 06/28/2025 09:47 (2), 11/12/2025 18:00 (12)
Complete: 🔍
Cache ID: 216::103

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