Kernel-memory disclosure via unchecked audio enumeration
Published Oct 7, 2025 · Updated Oct 7, 2025
Use-after-free in the Linux kernel allows local users to read out-of-bounds kernel memory through an ASoC audio control. The LPASS tx_macro_put_dec_enum function accepts an enumeration item without checking it against the control's item count, then derives an invalid audio register that regmap reads outside its cache. Reachability requires local low-privileged access to the ALSA control on a Qualcomm sc7280 LPASS system; the resulting access exposes kernel memory or crashes the system.
Summary
What happened
Use-after-free in the Linux kernel allows local users to read out-of-bounds kernel memory through an ASoC audio control. The LPASS tx_macro_put_dec_enum function accepts an enumeration item without checking it against the control's item count, then derives an invalid audio register that regmap reads outside its cache. Reachability requires local low-privileged access to the ALSA control on a Qualcomm sc7280 LPASS system; the resulting access exposes kernel memory or crashes the system.
The record
- CVE
- CVE-2023-53640
- Published
- Oct 7, 2025
- Updated
- Oct 7, 2025
- Vendor
- The Linux Kernel Organization
- Product
- Linux
- Classifications
- CWE-416
- Attack vector
- local
- Privileges
- authenticated
Timeline
How it unfolded
- Oct 7, 2025CVE publishedPublication date reported by the CVE source.
- Oct 7, 2025Record updatedLatest update available in the CVE record.
Exploitability
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- Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <75e5fab7db0cecb6e16b22c34608f0b40a4c7cd1
- Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <8d81d3b0ed3610d24191d24f8e9e20f6775f0cc5
- Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <8f1512d78b5de928f4616a871e77b58fd546e651
- Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <f5e61e3fe799ba2fda4320af23d26d28c3302045
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Published CVSS scores
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Attacks
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Weakness, pattern, technique
Public exploit references
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Technologies
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