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CVE-2023-54022ALSA: usb-audio: Fix potential memory leaks at error path for UMP open

Description

In the Linux kernel, the following vulnerability has been resolved: ALSA: usb-audio: Fix potential memory leaks at error path for UMP open The allocation and initialization errors at alloc_midi_urbs() that is called at MIDI 2.0 / UMP device are supposed to be handled at the caller side by invoking free_midi_urbs(). However, free_midi_urbs() loops only for ep->num_urbs entries, and since ep->num_entries wasn't updated yet at the allocation / init error in alloc_midi_urbs(), this entry won't be released. The intention of free_midi_urbs() is to release the whole elements, so change the loop size to NUM_URBS to scan over all elements for fixing the missed releases. Also, the call of free_midi_urbs() is missing at snd_usb_midi_v2_open(). Although it'll be released later at reopen/close or disconnection, it's better to release immediately at the error path.

Timeline

  1. ID reserved

    By Linux

  2. Published

  3. · 5 months later

    Record updated

Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.

Scores

No CVSS score yet: neither the CNA, CISA nor NVD has scored this CVE. NVD status: Deferred.

EPSS (exploitation in 30 days)
0.17% · top 93% of all CVEs (14 Nov 2026)
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The list uses the assigner's score when there is one, then CISA's, then NVD's: Not scored.

Affected products

  • Linux · Linux

    • affected ff49d1df79aef7580fe3ac99d17c3f886655d080 – < f819b343aa95d24d5f7d6e06660c7f62591abc5f
    • affected ff49d1df79aef7580fe3ac99d17c3f886655d080 – < b1757fa30ef14f254f4719bf6f7d54a4c8207216

  • Linux · Linux

    • affected 6.5
    • unaffected < 6.5
    • unaffected 6.5.3 – ≤ 6.5.*
    • unaffected 6.6 – ≤ *

References

References2

Sources

The same CVE in the primary databases and aggregators, to check against.

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Record last updated .