Kernel heap corruption via MBSSID count wraparound
Published Oct 4, 2025 · Updated Oct 4, 2025
Integer overflow in Linux kernel nl80211 allows local users to corrupt kernel heap memory through crafted nested MBSSID attributes. The nl80211_parse_mbssid_elems() function counts elements in an 8-bit value, so 256 entries wrap the allocation count to zero before the trailing array is populated out of bounds. Triggering requires CAP_NET_ADMIN and a wireless driver that sets wiphy->mbssid_max_interfaces; the resulting heap overwrite can crash the kernel or modify kernel memory.
Summary
What happened
Integer overflow in Linux kernel nl80211 allows local users to corrupt kernel heap memory through crafted nested MBSSID attributes. The nl80211_parse_mbssid_elems() function counts elements in an 8-bit value, so 256 entries wrap the allocation count to zero before the trailing array is populated out of bounds. Triggering requires CAP_NET_ADMIN and a wireless driver that sets wiphy->mbssid_max_interfaces; the resulting heap overwrite can crash the kernel or modify kernel memory.
The record
- CVE
- CVE-2023-53570
- Published
- Oct 4, 2025
- Updated
- Oct 4, 2025
- Vendor
- The Linux Kernel Organization
- Product
- Linux
- Classifications
- CWE-190, T1068
- Attack vector
- local
- Privileges
- admin
Timeline
How it unfolded
- Oct 4, 2025CVE publishedPublication date reported by the CVE source.
- Oct 4, 2025Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
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- Affected versionversion=5.16
- Affected versionversion=dc1e3cb8da8b414b37208b2fb6755fef8122504b <6311071a056272e1e761de8d0305e87cc566f734
- Affected versionversion=dc1e3cb8da8b414b37208b2fb6755fef8122504b <7d09f9f255a5f78578deba5454923072bb53b16c
- Affected versionversion=dc1e3cb8da8b414b37208b2fb6755fef8122504b <e642eb67b8c10dcce758d549cc81564116e0fa49
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What is affected?
Published CVSS scores
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Attacks
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Weakness, pattern, technique
Public exploit references
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Technologies
Your stack
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Your stack
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