Kernel memory disclosure via misclassified keyring shortcut
Published Nov 19, 2024 · Updated Aug 5, 2026
Out-of-bounds read in the Linux kernel keyring code allows local users to disclose kernel memory or crash the system through crafted keys. search_nested_keyrings misclassifies a root-node shortcut pointer as a keyring because its subtype bits overlap, and key_task_permission then reads beyond the slab object. Reaching the flaw requires more than 32 similarly hashed keys, a reboot, and local low-privilege access; the bounded consequences are kernel-memory disclosure and a system crash.
Summary
What happened
Out-of-bounds read in the Linux kernel keyring code allows local users to disclose kernel memory or crash the system through crafted keys. search_nested_keyrings misclassifies a root-node shortcut pointer as a keyring because its subtype bits overlap, and key_task_permission then reads beyond the slab object. Reaching the flaw requires more than 32 similarly hashed keys, a reboot, and local low-privilege access; the bounded consequences are kernel-memory disclosure and a system crash.
The record
- CVE
- CVE-2024-50301
- Published
- Nov 19, 2024
- Updated
- Aug 5, 2026
- Vendor
- Siemens
- Product
- SIPLUS S7-1500 CPU 1518-4 PN/DP MFP
- Classifications
- CWE-125
- Attack vector
- local
- Privileges
- authenticated
Timeline
How it unfolded
- Nov 19, 2024CVE publishedPublication date reported by the CVE source.
- Aug 5, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=V3.1.0 <V3.1.5
What conditions does exploitation require?
What is affected?
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Weakness, pattern, technique
Public exploit references
- Linux keyring shortcut-collision reproducerproof of concept · demonstrated
Labels summarize the accepted research assessment. They do not indicate a test against your environment.
Technologies
Your stack
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Your stack
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