Kernel memory corruption via RCU-unsafe key deletion
Published May 1, 2024 · Updated Aug 5, 2026
Use-after-free in Linux mac802154 before fixed stable releases allows local users to corrupt kernel memory during concurrent LLSEC key deletion. mac802154_llsec_key_del frees key resources without waiting for an RCU grace period while llsec_lookup_key can traverse the same list. Local access and overlapping key lookup and deletion are required; the documented result is a refcount warning and kernel use-after-free.
Summary
What happened
Use-after-free in Linux mac802154 before fixed stable releases allows local users to corrupt kernel memory during concurrent LLSEC key deletion. mac802154_llsec_key_del frees key resources without waiting for an RCU grace period while llsec_lookup_key can traverse the same list. Local access and overlapping key lookup and deletion are required; the documented result is a refcount warning and kernel use-after-free.
The record
- CVE
- CVE-2024-26961
- Published
- May 1, 2024
- Updated
- Aug 5, 2026
- Vendor
- Siemens
- Product
- SIMATIC S7-1500 TM MFP - GNU/Linux subsystem
- Classifications
- CWE-416
- Attack vector
- local
- Privileges
- authenticated
Timeline
How it unfolded
- May 1, 2024CVE publishedPublication date reported by the CVE source.
- Aug 5, 2026Record updatedLatest update available in the CVE record.
Exploitability
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- Affected versionversion=0 <*
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Published CVSS scores
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Attacks
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Technologies
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