CVE-2026-23208 — ALSA: usb-audio: Prevent excessive number of frames
In the Linux kernel, the following vulnerability has been resolved: ALSA: usb-audio: Prevent excessive number of frames In this case, the user constructed the parameters with maxpacksize 40 for rate 22050 / pps 1000, and packsize[0] 22 packsize[1] 23. The buffer size for each data URB is maxpacksize * packets, which in this example is 40 * 6 = 240; When the user performs a write operation to send audio data into the ALSA PCM playback stream, the calculated number of frames is packsize[0] * packets = 264, which exceeds the allocated URB buffer size, triggering the out-of-bounds (OOB) issue reported by syzbot [1]. Added a check for the number of single data URB frames when calculating the number of frames to prevent [1]. [1] BUG: KASAN: slab-out-of-bounds in copy_to_urb+0x261/0x460 sound/usb/pcm.c:1487 Write of size 264 at addr ffff88804337e800 by task syz.0.17/5506 Call Trace: copy_to_urb+0x261/0x460 sound/usb/pcm.c:1487 prepare_playback_urb+0x953/0x13d0 sound/usb/pcm.c:1611 prepare_outbound_urb+0x377/0xc50 sound/usb/endpoint.c:333
Who exploits it and how urgent it is
A 0–100 score combining confirmed exploitation, ransomware and APT use, public exploits, EPSS and severity.
How the score was calculated
- EPSS 0.1% (30-day exploitation probability)+0
- Technical severity (high)+6
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.
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.
- Identify exposed assets running the affected vendor/product/version combinations (Linux Linux, Linux Linux Kernel).
- Apply the fixed version or the patch documented under Remediation.
- Search available logs for exploit probes matching the vulnerability class (memory corruption), errors and authentication anomalies.
Affected scope
Vendor, product and versions as the sources word them.
| Vendor | Product | Versions | Status | Source |
|---|---|---|---|---|
| Linux | Linux |
≥ 5ef30e443e6d3654cccecec99cf481a69a0a6d3b and < ab0b5e92fc36ee82c1bd01fe896d0f775ed5de41version 5.8≥ 5.7.6 and < 5.7.8≥ 5.4.49 and < 5.4.51≥ 4.19.130 and < 4.19.132≥ 4.14.186 and < 4.14.188≥ 4.9.229 and < 4.9.230≥ 4.4.229 and < 4.4.230 and 7 more≥ f0bd62b64016508938df9babe47f65c2c727d25c and < ef5749ef8b307bf8717945701b1b79d036af0a15≥ f0bd62b64016508938df9babe47f65c2c727d25c and < 62932d9ed639a9fa71b4ac1a56766a4b43abb7e4≥ d288dc74f8cf95cb7ae0aaf245b7128627a49bf3 and < d67dde02049e632ba58d3c44a164a74b6a737154≥ aba41867dd66939d336fdf604e4d73b805d8039f and < e0ed5a36fb3ab9e7b9ee45cd17f09f6d5f594360≥ 2d50acd7dbd0682a56968ad9551341d7fc5b6eaf and < c4dc012b027c9eb101583011089dea14d744e314≥ 99703c921864a318e3e8aae74fde071b1ff35bea and < 282aba56713bbc58155716b55ca7222b2d9cf3c8≥ 02c56650f3c118d3752122996d96173d26bb13aa and < 480a1490c595a242f27493a4544b3efb21b29f6a |
Vulnerable | CVE Program (cve.org) e CISA ADP |
| Linux | Linux Kernel |
≥ 4.14.186 and < 4.14.188version 6.19-rc5version 6.19-rc4version 6.19-rc3version 6.19-rc2version 6.19-rc1version 4.9.229version 4.4.229 and 4 more≥ 5.8 and < 6.18.10≥ 5.7.6 and < 5.7.8≥ 5.4.49 and < 5.4.51≥ 4.19.130 and < 4.19.132 |
Vulnerable | NIST National Vulnerability Database |
Attack characteristics
The CVSS vector, decoded. It describes the attack, not your exposure to it.
Every base score collected
Sources score independently and may disagree; each row says who scored it and under which version.
| Score | Version | Severity | Expl. | Impact | Scored by |
|---|---|---|---|---|---|
| 7.8 | CVSS 3.1 | High | 1.8 | 5.9 | nvd@nist.gov via NIST National Vulnerability Database |
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H (score shown at the top: nvd@nist.gov) Weakness MITRE
Weakness class according to MITRE’s CWE catalog.
EPSS over time FIRST
Oct 13, 2026 → Oct 14, 2026 · 2 reading(s) · max 0.14%
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.
- Correlate service crashes/restarts with inbound traffic; repeated crashes may indicate attempts.
Timeline
What happened to this CVE, newest first.
- 2026
- Affected products added · linux/linux
- Record published
- Fix documented
- CVSS changed · 7.8
- Source status changed · → Analyzed
- Record created in this database
- CVE published
Source activity
Repeated readings are counted rather than listed.
- 1× Official description updated · Oct 13, 2026 – Oct 13, 2026
References
8 on the record
- git.kernel.org/stable/c/ab0b5e92fc36ee82c1bd01fe896d0f775ed5de41
- git.kernel.org/stable/c/e0ed5a36fb3ab9e7b9ee45cd17f09f6d5f594360
- git.kernel.org/stable/c/282aba56713bbc58155716b55ca7222b2d9cf3c8
- git.kernel.org/stable/c/ef5749ef8b307bf8717945701b1b79d036af0a15
- git.kernel.org/stable/c/c4dc012b027c9eb101583011089dea14d744e314
- git.kernel.org/stable/c/480a1490c595a242f27493a4544b3efb21b29f6a
- git.kernel.org/stable/c/d67dde02049e632ba58d3c44a164a74b6a737154
- git.kernel.org/stable/c/62932d9ed639a9fa71b4ac1a56766a4b43abb7e4
Elsewhere on this site
Related CVEs (same products)
- Critical CVE-2026-99999 ipv4: validate checksum_start before completing checksum 9h
- Unknown CVE-2026-98432 ipv4: free inet_opt and ireq_opt after an RCU grace period 9h
- Unknown CVE-2026-98424 wifi: cfg80211: undo netns switch if renaming the wiphy fails 1d
- Unknown CVE-2026-98425 wifi: mac80211: don't warn when an IBSS has no channel to scan 1d
- Unknown CVE-2026-98426 wifi: mwifiex: fix IRQ leak using wrong index in MSI-X error path 1d
- Unknown 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 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-2026-23208 is "ALSA: usb-audio: Prevent excessive number of frames", rated High. It affects Linux (Linux); versions are in the scope table. It is not in CISA KEV, which does not rule out exploitation. CVSS 7.8 describes technical severity. EPSS 0.14% 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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