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NVD / CVE Program· CNA Linux

CVE-2026-46048: ALSA: caiaq: fix usb_dev refcount leak on probe failure

Noroxi assessment

Priority: Monitor (action score 22/100)

  • 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: 0.12% (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 21ca595aafa40d3ac70eab1f4cb62cc00ca21657, 50c6a1f05973f56d23280c9d7645a7a5734e0907, 6.12.86; azl3 kernel 6.6.139.1-1 on Azure Linux 3.0 6.6.141.1-1.

Low priority for now. Upgrade to Linux Linux 21ca595aafa40d3ac70eab1f4cb62cc00ca21657, 50c6a1f05973f56d23280c9d7645a7a5734e0907, 6.12.86; azl3 kernel 6.6.139.1-1 on Azure Linux 3.0 6.6.141.1-1 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: caiaq: fix usb_dev refcount leak on probe failure create_card() takes a reference on the USB device with usb_get_dev() and stores the matching usb_put_dev() in card_free(), which is installed as the snd_card's ->private_free destructor. However, ->private_free is only assigned near the end of init_card(), after several failure points (usb_set_interface(), EP type checks, usb_submit_urb(), the EP1_CMD_GET_DEVICE_INFO exchange, and its timeout). When any of those fail, init_card() returns an error to snd_probe(), which calls snd_card_free(card). Because ->private_free is still NULL, card_free() never runs, the usb_get_dev() reference is not dropped, and the struct usb_device leaks along with its descriptor allocations and device_private. syzbot reproduces this with a malformed UAC3 device whose only valid altsetting is 0; init_card()'s usb_set_interface(usb_dev, 0, 1) call fails with -EIO and triggers the leak. Move the ->private_free assignment into create_card(), immediately after usb_get_dev(), so that every error path reaching snd_card_free() balances the reference. card_free()'s callees (snd_usb_caiaq_input_free, free_urbs, kfree) already tolerate the partially-initialized state because the chip private area is zero-initialized by snd_card_new().

MediumCVSS 5.5 · v3.1—No exploit Fix available
Published
May 27, 2026
Updated
Jun 17, 2026
EPSS
0.1% · 2th percentile
CWE
—

Report tools

JSON

Action score

22

Monitor

Low priority for now.

CVSS
22 / 40 · 5.5 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.1%

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

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When you'll hear from us

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  • when exploit code appears or is weaponized
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  • 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 kernel6.6.136 and later · before 6.6.140
  • linux linux kernel6.12.84 and later · before 6.12.86
  • linux linux kernel6.18.25 and later · before 6.18.27
  • linux linux kernel7.0.2 and later · before 7.0.4
  • linux linux kernel7.1

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

    • 493b3a682ededc804555755f5d2193201339612d and later · before c874db8a1d2f9f08161470d00cfe8db2f5cca2ccaffected · git
    • dbcf7588e8dea017ddb3f18ec2766f7d2e5f2a0e and later · before 6fa8dff64fb6c401ced40a05797b327659317498affected · git
    • ac7345f68cda6989016d85d63f7b244c064aa8f6 and later · before a8d907acc3e5a078c2e5637ff60c30c6d2ddc23aaffected · git
    • f6634af5de728a46792f674a66d7843570cb68f7 and later · before 50c6a1f05973f56d23280c9d7645a7a5734e0907affected · git
    • 1d9be95aee6c6246a21752e60c9519902649f482 and later · before da3b8fd6a202d94fef11a443abc9171c52426a1caffected · git
    • 6473ed16df1fe88051140611b3eb9a49be7f429e and later · before 6153878c5255bb69b7d0868105ca078ef13cbcf8affected · git
    • 59b622a043cffc58b7638cd85ae6c30a0904f8e6 and later · before 21ca595aafa40d3ac70eab1f4cb62cc00ca21657affected · git
    • 80bb50e2d459213cccff3111d5ef98ed4238c0d5 and later · before 7a5f1cd22d47f8ca4b760b6334378ae42c1bd24baffected · git
    • 6.6.136 and later · before 6.6.140affected · semver
    • 6.12.84 and later · before 6.12.86affected · semver

Package-level exposure

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

EcosystemPackageAffected rangeFix
Debian:13linuxbefore 6.12.86-16.12.86-1
Debian:14linuxbefore 7.0.4-17.0.4-1

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-2026-46042May 27, 2026 · mm/mempolicy: fix memory leaks in weighted_interleave_auto_store()
    22Monitor
  • ← EarlierCVE-2026-46045May 27, 2026 · md/md-llbitmap: skip reading rdevs that are not in_sync
    31Monitor
  • Later →CVE-2026-46049May 27, 2026 · ALSA: ctxfi: Add fallback to default RSR for S/PDIF
    22Monitor

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 Linux21ca595aafa40d3ac70eab1f4cb62cc00ca21657Vendor (CNA)
Linux Linux50c6a1f05973f56d23280c9d7645a7a5734e0907Vendor (CNA)
Linux Linux6.12.86Vendor (CNA)
Linux Linux6.18.27Vendor (CNA)
Linux Linux6.6.140Vendor (CNA)
Linux Linux6153878c5255bb69b7d0868105ca078ef13cbcf8Vendor (CNA)
Linux Linux6fa8dff64fb6c401ced40a05797b327659317498Vendor (CNA)
Linux Linux7.0.4Vendor (CNA)
Linux Linux7a5f1cd22d47f8ca4b760b6334378ae42c1bd24bVendor (CNA)
Linux Linuxa8d907acc3e5a078c2e5637ff60c30c6d2ddc23aVendor (CNA)
Linux Linuxc874db8a1d2f9f08161470d00cfe8db2f5cca2ccVendor (CNA)
Linux Linuxda3b8fd6a202d94fef11a443abc9171c52426a1cVendor (CNA)
azl3 kernel 6.6.139.1-1 on Azure Linux 3.06.6.141.1-1 · CBL-Mariner ReleasesMicrosoft (MSRC)
debian:linux6.12.86-1 · Debian:13Package 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
none
Integrity
none
Availability
high · the service can be disrupted
Attack vector
Local
Attack complexity
Low
Privileges required
Low
User interaction
None
Scope
Unchanged
Confidentiality impact
None
Integrity impact
None
Availability impact
High

Weakness class (CWE)

—

CVSS vector

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/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. Fix✗ → ✓

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

References

Show all references (7 more)

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

All records