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NVD / CVE Program· CNA Linux

CVE-2026-23208: ALSA: usb-audio: Prevent excessive number of frames

Noroxi assessment

Priority: Monitor (action score 31/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 0.18% (FIRST EPSS).
  • Someone with local access to the system can trigger it. A low-privileged account is enough. No user action is required. No special conditions are required; it is repeatable.
  • Fixed version: Linux Linux 152fc4f7b4a8af1c0418d2722f3b2729799cc837, 282aba56713bbc58155716b55ca7222b2d9cf3c8, 4.14.188; cbl2 kernel 5.15.202.1-1 on CBL-Mariner 2.0 Release Notes.

Low priority for now. Upgrade to Linux Linux 152fc4f7b4a8af1c0418d2722f3b2729799cc837, 282aba56713bbc58155716b55ca7222b2d9cf3c8, 4.14.188; cbl2 kernel 5.15.202.1-1 on CBL-Mariner 2.0 Release Notes or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

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

HighCVSS 7.8 · v3.1—No exploit Fix available
Published
Feb 14, 2026
Updated
Nov 5, 2026
EPSS
0.1% · 8th percentile

Report tools

JSON

Action score

31

Monitor

Low priority for now.

CVSS
31 / 40 · 7.8 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.1%

CISA SSVC decision

Exploitation
none
Automatable
no
Technical impact
partial

Vulnrichment: CISA's decision-tree inputs.

Get told when this record changes

  • Not in KEV: no record of exploitation in the wild
  • No public exploit code on record
  • A fix has been released

If any of these changes, we'll tell you in the daily email digest.

Follow CVE-2026-23208

When you'll hear from us

  • when it enters CISA KEV
  • when exploit code appears or is weaponized
  • when the record is updated (including a fixed version)
  • when EPSS rises 20 points in a week

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

VendorProduct
linuxlinux kernel

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • linux linux kernel4.14.186 and later · before 4.14.188
  • linux linux kernel4.19.130 and later · before 4.19.132
  • linux linux kernel5.4.49 and later · before 5.4.51
  • linux linux kernel5.7.6 and later · before 5.7.8
  • linux linux kernel5.8 and later · before 6.18.10
  • linux linux kernel4.4.229
  • linux linux kernel4.9.229
  • linux linux kernel6.19

Versions reported by the vendor

Affected version ranges reported by the assigning authority (Linux). Independent of NVD's CPE analysis and usually ahead of it.

  • Linux Linux

    • 5.8affected
    • 02c56650f3c118d3752122996d96173d26bb13aa and later · before 480a1490c595a242f27493a4544b3efb21b29f6aaffected · git
    • 5ef30e443e6d3654cccecec99cf481a69a0a6d3b and later · before ab0b5e92fc36ee82c1bd01fe896d0f775ed5de41affected · git
    • 99703c921864a318e3e8aae74fde071b1ff35bea and later · before 282aba56713bbc58155716b55ca7222b2d9cf3c8affected · git
    • 2d50acd7dbd0682a56968ad9551341d7fc5b6eaf and later · before c4dc012b027c9eb101583011089dea14d744e314affected · git
    • aba41867dd66939d336fdf604e4d73b805d8039f and later · before e0ed5a36fb3ab9e7b9ee45cd17f09f6d5f594360affected · git
    • d288dc74f8cf95cb7ae0aaf245b7128627a49bf3 and later · before d67dde02049e632ba58d3c44a164a74b6a737154affected · git
    • f0bd62b64016508938df9babe47f65c2c727d25c and later · before 581821f4b2ecbf411027b0af82b561ee208f4ba4affected · git
    • f0bd62b64016508938df9babe47f65c2c727d25c and later · before 152fc4f7b4a8af1c0418d2722f3b2729799cc837affected · git
    • f0bd62b64016508938df9babe47f65c2c727d25c and later · before 81e4b0009f2acc841d77a24fd796528b0bf62c4eaffected · git

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
Debian:12linuxfrom 0—
Debian:13linuxbefore 6.12.115-26.12.115-2
Debian:14linuxbefore 6.18.10-16.18.10-1

Same product

linux: all records

Other highest-scoring records for the same primary product.

  • CVE-2026-31431crypto: algif_aead - Revert to operating out-of-placeKEV
    90Now
  • CVE-2022-0847A flaw was found in the way the "flags" member of the new pipe buffer structure was lacking proper initialization in copy_page_to_iter_pipe KEV
    89Now
  • CVE-2021-22555Heap Out-Of-Bounds Write in Netfilter IP6T_SO_SET_REPLACEKEV
    85Now

Published before and after this one in the same product

  • ← EarlierCVE-2026-23206Feb 14, 2026 · dpaa2-switch: prevent ZERO_SIZE_PTR dereference when num_ifs is zero
    22Monitor
  • ← EarlierCVE-2026-23207Feb 14, 2026 · spi: tegra210-quad: Protect curr_xfer check in IRQ handler
    18Monitor
  • Later →CVE-2026-23209Feb 14, 2026 · macvlan: fix error recovery in macvlan_common_newlink()
    31Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
Linux Linux152fc4f7b4a8af1c0418d2722f3b2729799cc837Vendor (CNA)
Linux Linux282aba56713bbc58155716b55ca7222b2d9cf3c8Vendor (CNA)
Linux Linux4.14.188Vendor (CNA)
Linux Linux4.19.132Vendor (CNA)
Linux Linux4.4.230Vendor (CNA)
Linux Linux4.9.230Vendor (CNA)
Linux Linux480a1490c595a242f27493a4544b3efb21b29f6aVendor (CNA)
Linux Linux5.4.51Vendor (CNA)
Linux Linux5.7.8Vendor (CNA)
Linux Linux581821f4b2ecbf411027b0af82b561ee208f4ba4Vendor (CNA)
Linux Linux62932d9ed639a9fa71b4ac1a56766a4b43abb7e4Vendor (CNA)
Linux Linux81e4b0009f2acc841d77a24fd796528b0bf62c4eVendor (CNA)
Linux Linuxab0b5e92fc36ee82c1bd01fe896d0f775ed5de41Vendor (CNA)
Linux Linuxc4dc012b027c9eb101583011089dea14d744e314Vendor (CNA)
Linux Linuxd67dde02049e632ba58d3c44a164a74b6a737154Vendor (CNA)
Linux Linuxe0ed5a36fb3ab9e7b9ee45cd17f09f6d5f594360Vendor (CNA)
Linux Linuxef5749ef8b307bf8717945701b1b79d036af0a15Vendor (CNA)
cbl2 kernel 5.15.202.1-1 on CBL-Mariner 2.0Release NotesMicrosoft (MSRC)
debian:linux6.12.115-2 · Debian:13Package registry (OSV)
debian:linux6.18.10-1 · Debian:14Package registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

No history yet (it accumulates with the daily EPSS job).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

No nightly-computed relations.

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

Attack conditions

  • Someone with local access to the system can trigger it.
  • A low-privileged account is enough.
  • No user action is required.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
high · data can be read
Integrity
high · data or configuration can be modified
Availability
high · the service can be disrupted
Attack vector
Local
Attack complexity
Low
Privileges required
Low
User interaction
None
Scope
Unchanged
Confidentiality impact
High
Integrity impact
High
Availability impact
High

Weakness class (CWE)

CWE-787 · Out-of-bounds Write

CVSS vector

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

nvd-primary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

MITRE has no CAPEC/ATT&CK mapping for this CWE.

Change log

  1. SSVC exploitation— → none
  2. Fix✗ → ✓

For records you follow, these changes also arrive as notifications. →

References

Show all references (10 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records