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CVE-2025-71192· NVD / CVE Program· CNA Linux

ALSA: ac97: fix a double free in snd_ac97_controller_register()

In the Linux kernel, the following vulnerability has been resolved: ALSA: ac97: fix a double free in snd_ac97_controller_register() If ac97_add_adapter() fails, put_device() is the correct way to drop the device reference. kfree() is not required. Add kfree() if idr_alloc() fails and in ac97_adapter_release() to do the cleanup. Found by code review.

HighCVSS 7.0 · v3.1—No exploit Fix available
Published
Feb 4, 2026
Updated
Aug 5, 2026
EPSS
0.1% · 2th percentile
CWE
—
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Report tools

JSON

Action score

28

Monitor

Low priority for now.

CVSS
28 / 40 · 7.0 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.1%

CNA vs NVD score

NVD
—
CNA · Linux
7.0
NVD has not scored this yet; the score shown is the CNA’s.

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

Noroxi analysis

No Noroxi analysis for this record yet

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Affected systems

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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

    • 4.15affected
    • 74426fbff66eea8e8d1f42c8238c268d1e63a832 and later · before c80f9b3349a99a9d5b295f5bbc23f544c5995ad7affected · git
    • 74426fbff66eea8e8d1f42c8238c268d1e63a832 and later · before 21f8bc5179bed91c3f946adb5e55d717b891960caffected · git
    • 74426fbff66eea8e8d1f42c8238c268d1e63a832 and later · before fcc04c92cbb5497ce67c58dd2f0001bb87f40396affected · git
    • 74426fbff66eea8e8d1f42c8238c268d1e63a832 and later · before cb73d37ac18bc1716690ff5255a0ef1952827e9eaffected · git
    • 74426fbff66eea8e8d1f42c8238c268d1e63a832 and later · before 830988b6cf197e6dcffdfe2008c5738e6c6c3c0faffected · git
    • before 4.15not affected · semver
    • 6.1.161 and later · up to and including 6.1.*not affected · semver
    • 6.6.121 and later · up to and including 6.6.*not affected · semver
    • 6.12.66 and later · up to and including 6.12.*not affected · semver

Package-level exposure

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

EcosystemPackageAffected rangeFix
Debian:12linuxbefore 6.1.162-16.1.162-1
Debian:13linuxbefore 6.12.69-16.12.69-1
Debian:14linuxbefore 6.18.8-16.18.8-1

Same product

linux: all records

Other highest-scoring records for the same primary product.

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  • CVE-2026-74280crypto: marvell/octeontx - fix DMA cleanup using wrong loop index
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  • CVE-2026-74279crypto: cavium/cpt - fix DMA cleanup using wrong loop index
    40Plan

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 Linux21f8bc5179bed91c3f946adb5e55d717b891960cVendor (CNA)
Linux Linux830988b6cf197e6dcffdfe2008c5738e6c6c3c0fVendor (CNA)
Linux Linuxc80f9b3349a99a9d5b295f5bbc23f544c5995ad7Vendor (CNA)
Linux Linuxcb73d37ac18bc1716690ff5255a0ef1952827e9eVendor (CNA)
Linux Linuxfcc04c92cbb5497ce67c58dd2f0001bb87f40396Vendor (CNA)
debian:linux6.1.162-1 · Debian:12Package 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.

EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

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.

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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.
  • Special conditions such as timing or configuration are required.

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
High
Privileges required
Low
User interaction
None
Scope
Unchanged
Confidentiality impact
High
Integrity impact
High
Availability impact
High

Weakness class (CWE)

—

CVSS vector

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

nvd-secondary

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

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

All records