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NVD / CVE Program· CNA Linux

CVE-2026-31701: ALSA: caiaq: take a reference on the USB device in create_card()

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: 0.11% (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 1d9be95aee6c6246a21752e60c9519902649f482, 4.20, 493b3a682ededc804555755f5d2193201339612d.

Low priority for now. Upgrade to Linux Linux 1d9be95aee6c6246a21752e60c9519902649f482, 4.20, 493b3a682ededc804555755f5d2193201339612d 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: take a reference on the USB device in create_card() The caiaq driver stores a pointer to the parent USB device in cdev->chip.dev but never takes a reference on it. The card's private_free callback, snd_usb_caiaq_card_free(), can run asynchronously via snd_card_free_when_closed() after the USB device has already been disconnected and freed, so any access to cdev->chip.dev in that path dereferences a freed usb_device. On top of the refcounting issue, the current card_free implementation calls usb_reset_device(cdev->chip.dev). A reset in a free callback is inappropriate: the device is going away, the call takes the device lock in a teardown context, and the reset races with the disconnect path that the callback is already cleaning up after. Take a reference on the USB device in create_card() with usb_get_dev(), drop it with usb_put_dev() in the free callback, and remove the usb_reset_device() call.

MediumCVSS 5.5 · v3.1—No exploit Fix available
Published
May 1, 2026
Updated
Nov 6, 2026
EPSS
0.1% · 1th 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%

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-2026-31701

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 kernel6.13 and later · before 6.18.25
  • linux linux kernel6.19 and later · before 7.0.2
  • linux linux kernel6.13
  • 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

    • 3993edf44d3df7b6e8c753eac6ac8783473fcbab, ebad462eec93b0f701dfe4de98990e7355283801, dd0de8cb708951cebf727aa045e8242ba651bb52, 6.13affected
    • 4dd821dcbfcecf7af6a08370b0b217cde2818acf and later · before 493b3a682ededc804555755f5d2193201339612daffected · git
    • cadf1d8e9ddcd74584ec961aeac14ac549b261d8 and later · before dbcf7588e8dea017ddb3f18ec2766f7d2e5f2a0eaffected · git
    • 237f3faf0177bdde728fa3106d730d806436aa4d and later · before ac7345f68cda6989016d85d63f7b244c064aa8f6affected · git
    • 4507a8b9b30344c5ddd8219945f446d47e966a6d and later · before f6634af5de728a46792f674a66d7843570cb68f7affected · git
    • a3f9314752dbb6f6aa1f0f2b4c58243bda800738 and later · before 1d9be95aee6c6246a21752e60c9519902649f482affected · git
    • b04dcbb7f7b1908806b7dc22671cdbe78ff2b82c and later · before 6473ed16df1fe88051140611b3eb9a49be7f429eaffected · git
    • b04dcbb7f7b1908806b7dc22671cdbe78ff2b82c and later · before 59b622a043cffc58b7638cd85ae6c30a0904f8e6affected · git
    • b04dcbb7f7b1908806b7dc22671cdbe78ff2b82c and later · before 80bb50e2d459213cccff3111d5ef98ed4238c0d5affected · git
    • 5.10.231 and later · before 5.10.258affected · semver

Package-level exposure

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

EcosystemPackageAffected rangeFix
Debian:12linuxbefore 6.1.176-16.1.176-1
Debian:13linuxbefore 6.12.85-16.12.85-1
Debian:14linuxbefore 7.0.3-17.0.3-1
openSUSE:Tumbleweedkernel-sourcebefore 7.0.7-1.17.0.7-1.1

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-2026-31699May 1, 2026 · crypto: ccp: Don't attempt to copy CSR to userspace if PSP command failed
    28Monitor
  • ← EarlierCVE-2026-31700May 1, 2026 · net/packet: fix TOCTOU race on mmap'd vnet_hdr in tpacket_snd()
    31Monitor
  • Later →CVE-2026-31704May 1, 2026 · ksmbd: use check_add_overflow() to prevent u16 DACL size overflow
    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 Linux1d9be95aee6c6246a21752e60c9519902649f482Vendor (CNA)
Linux Linux4.20Vendor (CNA)
Linux Linux493b3a682ededc804555755f5d2193201339612dVendor (CNA)
Linux Linux5.10.258Vendor (CNA)
Linux Linux5.15.209Vendor (CNA)
Linux Linux5.5Vendor (CNA)
Linux Linux59b622a043cffc58b7638cd85ae6c30a0904f8e6Vendor (CNA)
Linux Linux6.1.175Vendor (CNA)
Linux Linux6.12Vendor (CNA)
Linux Linux6.12.84Vendor (CNA)
Linux Linux6.6.136Vendor (CNA)
Linux Linux6473ed16df1fe88051140611b3eb9a49be7f429eVendor (CNA)
Linux Linux80bb50e2d459213cccff3111d5ef98ed4238c0d5Vendor (CNA)
Linux Linuxac7345f68cda6989016d85d63f7b244c064aa8f6Vendor (CNA)
Linux Linuxdbcf7588e8dea017ddb3f18ec2766f7d2e5f2a0eVendor (CNA)
Linux Linuxf6634af5de728a46792f674a66d7843570cb68f7Vendor (CNA)
debian:linux6.1.176-1 · Debian:12Package registry (OSV)
opensuse:kernel-source7.0.7-1.1 · openSUSE:TumbleweedPackage 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. SSVC exploitation— → none
  2. 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