Kernel memory corruption via oversized channel bitmap
Published May 17, 2024 · Updated May 12, 2026
Out-of-bounds write in Linux ALSA USB audio allows physically proximate attackers to corrupt kernel memory via crafted device descriptors. The convert_chmap function copies each set wChannelConfig bit into chmap->map and increments the index without stopping at the declared channel count. The flaw is reached while the kernel parses a malicious USB audio device, and excess bits write beyond the allocated channel map.
Summary
What happened
Out-of-bounds write in Linux ALSA USB audio allows physically proximate attackers to corrupt kernel memory via crafted device descriptors. The convert_chmap function copies each set wChannelConfig bit into chmap->map and increments the index without stopping at the declared channel count. The flaw is reached while the kernel parses a malicious USB audio device, and excess bits write beyond the allocated channel map.
The record
- CVE
- CVE-2024-27436
- Published
- May 17, 2024
- Updated
- May 12, 2026
- Vendor
- Siemens
- Product
- SIMATIC S7-1500 TM MFP - GNU/Linux subsystem
- Classifications
- CWE-787, T1200
- Attack vector
- physical
- Privileges
- unauthenticated
Timeline
How it unfolded
- May 17, 2024CVE publishedPublication date reported by the CVE source.
- May 12, 2026Record updatedLatest update available in the CVE record.
Exploitability
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- Affected versionversion=0 <*
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What is affected?
Published CVSS scores
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Attacks
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Technologies
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Your stack
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