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NVD / CVE Program· CNA Linux

CVE-2023-53648: ALSA: ac97: Fix possible NULL dereference in snd_ac97_mixer

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: 0.21% (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 09baf460dfba79ee6a0c72e68ccdbbba84d894df, 228da1fa124470606ac19783e551f9d51a1e01b0, 300e26e3e64880de5013eac8831cf44387ef752c.

Low priority for now. Upgrade to Linux Linux 09baf460dfba79ee6a0c72e68ccdbbba84d894df, 228da1fa124470606ac19783e551f9d51a1e01b0, 300e26e3e64880de5013eac8831cf44387ef752c 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: ac97: Fix possible NULL dereference in snd_ac97_mixer smatch error: sound/pci/ac97/ac97_codec.c:2354 snd_ac97_mixer() error: we previously assumed 'rac97' could be null (see line 2072) remove redundant assignment, return error if rac97 is NULL.

MediumCVSS 5.5 · v3.1—No exploit Fix available
Published
Oct 7, 2025
Updated
Jun 17, 2026
EPSS
0.2% · 11th percentile

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 · 0.2%

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.

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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 kernel2.6.28 and later · before 4.14.322
  • linux linux kernel4.15 and later · before 4.19.291
  • linux linux kernel4.20 and later · before 5.4.251
  • linux linux kernel5.5 and later · before 5.10.188
  • linux linux kernel5.11 and later · before 5.15.121
  • linux linux kernel5.16 and later · before 6.1.39
  • linux linux kernel6.2 and later · before 6.3.13
  • linux linux kernel6.4 and later · before 6.4.4

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

    • 2.6.28affected
    • da3cec35dd3c31d8706db4bf379372ce70d92118 and later · before 809af7bb4219bdeef0dbb8b2ed700d6516d13fe9affected · git
    • da3cec35dd3c31d8706db4bf379372ce70d92118 and later · before e4cccff1e7ab6ea30995b6fbbb007d02647e025caffected · git
    • da3cec35dd3c31d8706db4bf379372ce70d92118 and later · before 5f13d67027fa782096e6aee0db5dce61c4aeb613affected · git
    • da3cec35dd3c31d8706db4bf379372ce70d92118 and later · before f923a582217b198b557756809ffe42ac0fad6adbaffected · git
    • da3cec35dd3c31d8706db4bf379372ce70d92118 and later · before 300e26e3e64880de5013eac8831cf44387ef752caffected · git
    • da3cec35dd3c31d8706db4bf379372ce70d92118 and later · before d28b83252e150155b8b8c65b612c555e93c8b45faffected · git
    • da3cec35dd3c31d8706db4bf379372ce70d92118 and later · before 09baf460dfba79ee6a0c72e68ccdbbba84d894dfaffected · git
    • da3cec35dd3c31d8706db4bf379372ce70d92118 and later · before 228da1fa124470606ac19783e551f9d51a1e01b0affected · git
    • da3cec35dd3c31d8706db4bf379372ce70d92118 and later · before 79597c8bf64ca99eab385115743131d260339da5affected · git

Package-level exposure

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

EcosystemPackageAffected rangeFix
Debian:12linuxbefore 6.1.52-16.1.52-1
Debian:13linuxbefore 6.4.4-16.4.4-1

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-2023-53646Oct 7, 2025 · drm/i915/perf: add sentinel to xehp_oa_b_counters
    28Monitor
  • ← EarlierCVE-2023-53647Oct 7, 2025 · Drivers: hv: vmbus: Don't dereference ACPI root object handle
    22Monitor
  • Later →CVE-2023-53649Oct 7, 2025 · perf trace: Really free the evsel->priv area
    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 Linux09baf460dfba79ee6a0c72e68ccdbbba84d894dfVendor (CNA)
Linux Linux228da1fa124470606ac19783e551f9d51a1e01b0Vendor (CNA)
Linux Linux300e26e3e64880de5013eac8831cf44387ef752cVendor (CNA)
Linux Linux5f13d67027fa782096e6aee0db5dce61c4aeb613Vendor (CNA)
Linux Linux79597c8bf64ca99eab385115743131d260339da5Vendor (CNA)
Linux Linux809af7bb4219bdeef0dbb8b2ed700d6516d13fe9Vendor (CNA)
Linux Linuxd28b83252e150155b8b8c65b612c555e93c8b45fVendor (CNA)
Linux Linuxe4cccff1e7ab6ea30995b6fbbb007d02647e025cVendor (CNA)
Linux Linuxf923a582217b198b557756809ffe42ac0fad6adbVendor (CNA)
debian:linux6.1.52-1 · 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.

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)

CWE-476 · NULL Pointer Dereference

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 (8 more)

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

All records