5.5

CVE-2023-53045: linux Improper Locking

CVSS: 5.5v3.1MediumAnalyzed
AliasesUBUNTU-CVE-2023-53045DEBIAN-CVE-2023-53045
Published 02-05-2025Last modified 11-05-2026
Open JSON

Vulnerability summary

CVE-2023-53045 is a medium (CVSS 5.5) Improper Locking vulnerability in linux. EPSS estimates a 0.15% chance of exploitation in the next 30 days, higher than 4.1% of scored vulnerabilities.

Overall risk
22/100
0100
Low · default modelHow is this calculated?
CVSS score
5.5/10
010
Medium · v3.1 (NVD)
EPSS score
0.15%
0%100%
Low · +0.01 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 5 · Related 5
SUSE-SU-2025:01918-1SUSE-SU-2025:01966-1SUSE-SU-2025:01983-1SUSE-SU-2025:02173-1SUSE-SU-2025:02262-1

Timeline

  1. 02-05-2025
    PublishedVulnerability first disclosed.
  2. 11-05-2026
    Last modifiedVulnerability information updated.

Description

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.

CVSS metrics

3 scores · 3 sources · 1 version

EPSS trend

Probability

0.15%

Chance of exploitation in the next 30 days

Percentile

4%

Versus all other CVEs

30-day change

+0.01 pp

From 0.15% on 21-09-2026

21-09-202621-10-2026
EPSS score
0.15%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Ubuntu116 products
  • linuxAll versions (No fix recorded) | < 5.4.0-156.173 | < 5.15.0-79.86
  • linux-allwinner-5.19All versions (No fix recorded)
  • linux-awsAll versions (No fix recorded) | < 5.4.0-1107.115 | < 5.15.0-1042.47
  • linux-aws-5.0All versions (No fix recorded)
  • linux-aws-5.11All versions (No fix recorded)
Linux2 products
  • linux≥ 132fcb460839a876f5bc8b71bede60f8d0875757, < 3e016ef2e72da93a2ea7afbb45de1b481b44d761 | ≥ 132fcb460839a876f5bc8b71bede60f8d0875757, < 3256e152b645fc1e788ba44c2d8ced690113e3e6 | ≥ 132fcb460839a876f5bc8b71bede60f8d0875757, < 0eda2004f38d95ef5715d62be884cd344260535b | ≥ 132fcb460839a876f5bc8b71bede60f8d0875757, < 33f341c1fc60e172a3515c51bdabee11e83d1ee9 | ≥ 132fcb460839a876f5bc8b71bede60f8d0875757, < b131989797f7287d7fdadb2bababc05a15d44750 | ≥ 132fcb460839a876f5bc8b71bede60f8d0875757, < 3bc7324e4911351e39c54a62e6ca46321cb10faf | ≥ 132fcb460839a876f5bc8b71bede60f8d0875757, < 43ca70753dfffd517d2af126da28690f8f615605 | ≥ 132fcb460839a876f5bc8b71bede60f8d0875757, < 6c67ed9ad9b83e453e808f9b31a931a20a25629b | 3.4
  • linux_kernel≥ 3.4, < 4.14.312 | ≥ 4.15, < 4.19.280 | ≥ 4.20, < 5.4.240 | ≥ 5.5, < 5.10.177 | ≥ 5.11, < 5.15.105 | ≥ 5.16, < 6.1.22 | ≥ 6.2, < 6.2.9 | 6.3:rc1 | 6.3:rc2 | 6.3:rc3
Debian1 product
  • linux< 6.1.25-1

3 vendors · 119 products

References

12 links
Show all 12 references