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CVE Record

CVE-2025-39935: ASoC: codec: sma1307: Fix memory corruption in sma1307_setting_loaded()

In the Linux kernel, the following vulnerability has been resolved: ASoC: codec: sma1307: Fix memory corruption in sma1307_setting_loaded() The sma1307->set.header_size is how many integers are in the header (there are 8 of them) but instead of allocating space of 8 integers we allocate 8 bytes. This leads to memory corruption when we copy data it on the next line: memcpy(sma1307->set.header, data, sma1307->set.header_size * sizeof(int)); Also since we're immediately copying over the memory in ->set.header, there is no need to zero it in the allocator. Use devm_kmalloc_array() to allocate the memory instead.

HighCVSS 7.8Not KEV-listedUpdated
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Glexia's TakeAutomated analysishigh

Security readout for executives and security teams

Plain-English summary

A Linux audio codec driver allocates too little memory for an eight-integer header, then copies the full header into that undersized space. The resulting memory corruption could let a local, low-privileged attacker compromise confidentiality, integrity, or availability when the vulnerable driver path is reachable.

Executive priority

Treat this as a high-priority kernel update for devices using the affected audio codec. It is not supported as an internet-wide emergency because exploitation requires local access and driver reachability. Promptly identify exposed systems, confirm vendor backports, and remediate them through normal kernel maintenance controls.

Technical view

In sma1307_setting_loaded(), header_size represents an integer count, but the original allocation treated it as a byte count. The following memcpy multiplies header_size by sizeof(int), overflowing the allocation. The referenced Linux stable changes replace the allocation with an array-aware allocation sized for the required integers.

Likely exposure

Exposure is most likely on Linux systems using the SMA1307 ASoC codec driver. The bundle identifies Linux 6.13, 6.16.9, and 6.17 as affected entries, but does not clearly define complete version ranges or distribution backports. Systems without this driver path are less likely exposed.

Exploitation context

The CVSS vector indicates local access, low attack complexity, low privileges, and no user interaction. The bundle does not establish how an attacker controls the copied data or how reliably the condition is exploitable. This CVE is not listed as KEV, and the supplied sources provide no evidence of active exploitation.

Researcher notes

The defect is a heap allocation-size mismatch followed immediately by an oversized copy. No CWE is supplied. The source bundle does not document the complete affected-version ranges, attacker-controlled input path, exploit reliability, distribution status, or observed attacks; those gaps limit exposure conclusions.

Mitigation direction

  • Update to a vendor-supported kernel release incorporating one of the referenced stable fixes.
  • Prioritize systems confirmed to use the SMA1307 ASoC codec driver.
  • If updating is delayed, consult the Linux distribution vendor for supported exposure-reduction guidance.
  • Track vendor backports because package versions may not map directly to upstream versions.

Validation and detection

  • Inventory kernel versions on systems using the SMA1307 audio codec driver.
  • Check distribution advisories or source history for inclusion of the referenced fix commits.
  • Confirm the corrected code allocates header_size integer elements, not header_size bytes.
  • After updating, verify the running kernel is remediated and audio functionality remains stable.
Prepared
Confidence
medium
Sources
4

Public sources used

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

Conservative CVE-to-ATT&CK context

These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.

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CVE-2025-39935 mapping review

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Vulnerability profileCVE Program record
Severity
High
CVSS
7.8 (3.1)
Known Exploited
No
Published

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

Official CVE source material

CNA and ADP enrichment extracted from CVE v5

These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.

1CVSS vectors
3Timeline events
0ADP providers
3Source links

CVSS vector scores

1 official score

We collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.

ScoreVersionSeverityVectorExploitImpactSource
7.8CVSS 3.1HighCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H1.85.9Linux

Vulnerability scoring details

Base CVSS 3.1 score

7.8High
CVSS 3.1 vector shape for CVE-2025-39935Attack VectorAttack ComplexityPrivileges RequiredUser InteractionScopeConfidentiality ImpactIntegrity ImpactAvailability Impact

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

Attack Vector
NetworkAdjacentLocalPhysical
Attack Complexity
LowHigh
Privileges Required
NoneLowHigh
User Interaction
NoneRequired
Scope
ChangedUnchanged
Confidentiality Impact
HighLowNone
Integrity Impact
HighLowNone
Availability Impact
HighLowNone

Vulnerability timeline

Timeline events are normalized from CVE metadata, CNA source timelines, ADP timelines, and KEV metadata when present.

  1. CVE reservedCVE Program

    The CVE ID was reserved by the assigning CNA.

  2. CVE publishedCVE Program

    The CVE record was published.

  3. CVE updatedCVE Program

    The CVE record metadata indicates this as the latest update time.

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
LinuxLinux576c57e6b4c1d734bcb7cc33dde9a99a9383b520, 576c57e6b4c1d734bcb7cc33dde9a99a9383b520unaffected
LinuxLinux6.13, 0, 6.16.9, 6.17affected
Weakness

CWE details

No CWE listed

CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.