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CVE Record

CVE-2023-53640: ASoC: lpass: Fix for KASAN use_after_free out of bounds

In the Linux kernel, the following vulnerability has been resolved: ASoC: lpass: Fix for KASAN use_after_free out of bounds When we run syzkaller we get below Out of Bounds error. "KASAN: slab-out-of-bounds Read in regcache_flat_read" Below is the backtrace of the issue: BUG: KASAN: slab-out-of-bounds in regcache_flat_read+0x10c/0x110 Read of size 4 at addr ffffff8088fbf714 by task syz-executor.4/14144 CPU: 6 PID: 14144 Comm: syz-executor.4 Tainted: G W Hardware name: Qualcomm Technologies, Inc. sc7280 CRD platform (rev5+) (DT) Call trace: dump_backtrace+0x0/0x4ec show_stack+0x34/0x50 dump_stack_lvl+0xdc/0x11c print_address_description+0x30/0x2d8 kasan_report+0x178/0x1e4 __asan_report_load4_noabort+0x44/0x50 regcache_flat_read+0x10c/0x110 regcache_read+0xf8/0x5a0 _regmap_read+0x45c/0x86c _regmap_update_bits+0x128/0x290 regmap_update_bits_base+0xc0/0x15c snd_soc_component_update_bits+0xa8/0x22c snd_soc_component_write_field+0x68/0xd4 tx_macro_put_dec_enum+0x1d0/0x268 snd_ctl_elem_write+0x288/0x474 By Error checking and checking valid values issue gets rectifies.

UnknownCVSS not scoredNot KEV-listedUpdated
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Glexia's TakeAutomated analysismoderate

Security readout for executives and security teams

Plain-English summary

CVE-2023-53640 is a Linux kernel memory-safety flaw in the ASoC LPASS audio driver. The public record shows KASAN detected an out-of-bounds read during audio control handling on Qualcomm sc7280 hardware. There is no CVSS score or public exploitation evidence in the supplied sources.

Executive priority

Treat this as a targeted kernel maintenance issue, not a confirmed emergency. Prioritize affected Qualcomm Linux fleets, embedded devices, and managed endpoints where kernel patch lag is common.

Technical view

The bug is described as a slab out-of-bounds read in regcache_flat_read reached through regmap and snd_soc_component update paths from tx_macro_put_dec_enum. The fix adds error checking and valid-value checks in the LPASS audio path. Public references are Linux stable commits only.

Likely exposure

Exposure is most likely on Linux systems using the Qualcomm LPASS ASoC audio driver, especially vendor kernels based on affected upstream versions. Non-Qualcomm systems or kernels without this driver path are less likely to be exposed.

Exploitation context

The supplied evidence is from syzkaller and KASAN, not real-world exploitation. KEV is false, and no cited source claims active exploitation. The available trace suggests local interaction with audio control handling, but exploitability and impact beyond out-of-bounds read are not established.

Researcher notes

Evidence is limited to the CVE record and Linux stable commits. No CWE, CVSS, exploit status, or detailed impact rating is provided. Avoid assuming privilege escalation or remote attack without additional vendor analysis.

Mitigation direction

  • Check whether deployed kernels include the referenced Linux stable fixes.
  • Apply vendor or distribution kernel updates that backport the LPASS fix.
  • Prioritize Qualcomm LPASS-enabled devices and embedded Linux builds for review.
  • If updates are unavailable, consult vendor guidance for temporary risk reduction.

Validation and detection

  • Inventory kernel versions and vendor kernel patch levels on Qualcomm-based systems.
  • Confirm whether the LPASS ASoC driver is built, loaded, or enabled.
  • Map deployed kernels against the referenced stable commit fixes.
  • Review distribution advisories for backported fixes under CVE-2023-53640.
Prepared
Confidence
medium
Sources
6

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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Vulnerability profileCVE Program record
Severity
Unknown
CVSS
Not scored
Known Exploited
No
Published
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.

0CVSS vectors
3Timeline events
0ADP providers
5Source links

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
LinuxLinuxc39667ddcfc516fee084e449179d54430a558298, c39667ddcfc516fee084e449179d54430a558298, c39667ddcfc516fee084e449179d54430a558298, c39667ddcfc516fee084e449179d54430a558298unaffected
LinuxLinux5.12, 0, 5.15.114, 6.1.31, 6.3.5, 6.4affected
Weakness

CWE details

No CWE listed

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