CVE Intelligence
Medium

CVE-2026-52963 — ALSA: usb-audio: Bound MIDI endpoint descriptor scans

In the Linux kernel, the following vulnerability has been resolved: ALSA: usb-audio: Bound MIDI endpoint descriptor scans snd_usbmidi_get_ms_info() validates the internal MIDIStreaming endpoint descriptor size before using baAssocJackID[], but the descriptor walker can still return a class-specific endpoint descriptor whose bLength exceeds the remaining bytes in the endpoint-extra scan. That leaves later flexible-array reads bounded by bLength, but not by the remaining bytes in the endpoint-extra scan. Stop walking when bLength is zero or extends past the remaining endpoint-extra scan.

Published Jun 24, 2026 · Updated Oct 13, 2026 · Sources: NIST National Vulnerability Database, CVE Program (cve.org) e CISA ADP · CNA: Linux

Who exploits it and how urgent it is

A 0–100 score combining confirmed exploitation, ransomware and APT use, public exploits, EPSS and severity.

No exploitation signal in the sources consulted so far.
How the score was calculated
  • EPSS 0.2% (30-day exploitation probability)+1
  • Technical severity (medium)+3

The score orders the patch queue; it does not replace your asset context (internet exposure, criticality, compensating controls).

Triage

Is it exploited, how likely is exploitation, what does it touch, and how severe do the sources call it.

Exploitation
Not confirmed
Not in CISA KEV — an absence of record, not proof it is unexploited.
EPSS FIRST
0.16%
ahead of 5% of scored CVEs · Oct 14, 2026
Affects
Linux
Linux and 1 more
CVSS base
5.5
Medium · 1 source(s)

Remediation

Fixes and mitigations documented by the sources — linked to the original advisory.

  • Documented patch — git.kernel.org (NIST National Vulnerability Database)
  • Documented patch — git.kernel.org (NIST National Vulnerability Database)
  • Documented patch — git.kernel.org (NIST National Vulnerability Database)
  • Documented patch — git.kernel.org (NIST National Vulnerability Database)
  • Documented patch — git.kernel.org (NIST National Vulnerability Database)
  • Documented patch — git.kernel.org (NIST National Vulnerability Database)
  • Documented patch — git.kernel.org (NIST National Vulnerability Database)
  • Documented patch — git.kernel.org (NIST National Vulnerability Database)

First 24 hours

Ordered from the record’s own fields — exposure first, because you cannot patch what you have not found. A rule-generated starting point.

  1. Identify exposed assets running the affected vendor/product/version combinations (Linux Linux, Linux Linux Kernel).
  2. Apply the fixed version or the patch documented under Remediation.
  3. Search available logs for exploit probes, errors and authentication anomalies.

Affected scope

Vendor, product and versions as the sources word them.

VendorProductVersionsStatusSource
Linux Linux version 65d95462001c6ccd9bc9499c1fc9a90eca9de496≥ 5c6cd7021a05a02fcf37f360592d7c18d4d807fb and < 3d3b2b01a3e73828e201ece96f863e7a3e0cdc6e≥ 5c6cd7021a05a02fcf37f360592d7c18d4d807fb and < a0226560540c16717efcceaf15c862cf115b01d3≥ 5c6cd7021a05a02fcf37f360592d7c18d4d807fb and < 09141583bd97f4bbd7358e29fd138fe798467cdb≥ 5c6cd7021a05a02fcf37f360592d7c18d4d807fb and < c59159ce10e75b568cd0d4b29efcb0fb0ddecc94≥ 5c6cd7021a05a02fcf37f360592d7c18d4d807fb and < d6854daa67be623860f4e1873fd3d3c275aba4edversion 9e0c71f2f633b0442661966228827d1a33df485fversion 0868bc5654c07628c421547f0821650a8c2cb8f3
and 11 more version 78483c1c7741ffa72991d93d19a75bfdcc2cbf57≥ 5c6cd7021a05a02fcf37f360592d7c18d4d807fb and < 728ab0c72e49ca27185067984cd565425eb69b2eversion ca767cf0152d18fc299cde85b18d1f46ac21e1ba≥ 4.4.238 and < 4.5≥ 4.9.238 and < 4.10≥ 4.14.200 and < 4.15≥ 4.19.149 and < 4.20≥ 5.4.69 and < 5.5version 5.7≥ 5c6cd7021a05a02fcf37f360592d7c18d4d807fb and < c65b137d351e21cbc5630e73ef0eb1e1d75f5b20≥ 5c6cd7021a05a02fcf37f360592d7c18d4d807fb and < e2f1260a056eb3215c13c48c5378f3e4112dc3af
Vulnerable CVE Program (cve.org) e CISA ADP
Linux Linux Kernel ≥ 4.9.238 and < 4.10≥ 4.4.238 and < 4.5≥ 4.14.200 and < 4.15≥ 4.19.149 and < 4.20≥ 5.4.69 and < 5.5≥ 5.7 and < 5.10.258≥ 5.11 and < 5.15.209≥ 5.16 and < 6.1.175
and 7 more ≥ 6.2 and < 6.6.141≥ 6.7 and < 6.12.91≥ 6.13 and < 6.18.33≥ 6.19 and < 7.0.10version 7.1-rc1version 7.1-rc2version 7.1-rc3
Vulnerable NIST National Vulnerability Database

Attack characteristics

The CVSS vector, decoded. It describes the attack, not your exposure to it.

Attack vector
Local
Attack complexity
Low
Privileges required
Low
User interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

Every base score collected

Sources score independently and may disagree; each row says who scored it and under which version.

ScoreVersionSeverityExpl.ImpactScored by
5.5 CVSS 3.1 Medium 1.8 3.6 nvd@nist.gov via NIST National Vulnerability Database
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H (score shown at the top: nvd@nist.gov)

EPSS over time FIRST

Oct 13, 2026 → Oct 14, 2026 · 2 reading(s) · max 0.16%

Detection

Read off the CVSS vector and the weakness class. Starting points, not tested rules.

  • Local/physical vector: focus on endpoint telemetry (EDR) from affected hosts.
endpoint telemetry (EDR)

Timeline

What happened to this CVE, newest first.

  • 2026
  • Affected products added · linux/linux
    Oct 13, 2026 · CVE Program (cve.org) e CISA ADP
  • Record published
    Oct 13, 2026
  • Fix documented
    Oct 13, 2026 · NIST National Vulnerability Database
  • CVSS changed · 5.5
    Oct 13, 2026 · NIST National Vulnerability Database
  • Source status changed · → Analyzed
    Oct 13, 2026 · NIST National Vulnerability Database
  • Record created in this database
    Oct 13, 2026 · NIST National Vulnerability Database
  • CVE published
    Jun 24, 2026 · Linux

Source activity

Repeated readings are counted rather than listed.

  • 1× Official description updated · Oct 13, 2026 – Oct 13, 2026

References

8 on the record

Elsewhere on this site

Linux
every CVE for this vendor

Related CVEs (same products)

  • CVE-2026-99999 ipv4: validate checksum_start before completing checksum 10h
  • CVE-2026-98432 ipv4: free inet_opt and ireq_opt after an RCU grace period 10h
  • CVE-2026-98424 wifi: cfg80211: undo netns switch if renaming the wiphy fails 1d
  • CVE-2026-98425 wifi: mac80211: don't warn when an IBSS has no channel to scan 1d
  • CVE-2026-98426 wifi: mwifiex: fix IRQ leak using wrong index in MSI-X error path 1d
  • CVE-2026-98427 net/sched: codel: bound the dropping loop per dequeue call 1d

Not in any source we poll

Listed rather than left blank: an empty field and an unmeasured one look identical on screen, and only one is a reason to look elsewhere.

  • No CISA SSVC assessment.
  • No CWE classification.
  • No confirmed IOCs, IP addresses, domains, file hashes, or malware artifacts supplied.
  • No organization-specific asset inventory, compensating-control status, or patch deployment evidence supplied.
  • No exploit packet captures, log samples, or incident case IDs supplied.

Answered from this record

Text assembled only from the fields above — no additional claims.

What should defenders know first?

CVE-2026-52963 is "ALSA: usb-audio: Bound MIDI endpoint descriptor scans", rated Medium. It affects Linux (Linux); versions are in the scope table. It is not in CISA KEV, which does not rule out exploitation. CVSS 5.5 describes technical severity. EPSS 0.16% estimates the probability of exploitation in 30 days; neither replaces your asset context. First verify whether exposed or business-critical assets run the affected versions, apply vendor fixes or mitigations, and preserve logs for review.

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