Local privilege escalation via AF_ALG socket double free
Published Jun 18, 2025 · Updated Aug 5, 2026
Double free in the Linux kernel allows local users to corrupt kernel memory through crafted operations on an AF_ALG hash socket. In hash_accept, a failed crypto_ahash_import frees the accepted socket, after which af_alg_release frees the same socket again. An unprivileged local process can reach the syscall path without user interaction, enabling kernel-memory disclosure, writes, control-flow hijacking, or a kernel panic.
Summary
What happened
Double free in the Linux kernel allows local users to corrupt kernel memory through crafted operations on an AF_ALG hash socket. In hash_accept, a failed crypto_ahash_import frees the accepted socket, after which af_alg_release frees the same socket again. An unprivileged local process can reach the syscall path without user interaction, enabling kernel-memory disclosure, writes, control-flow hijacking, or a kernel panic.
The record
- CVE
- CVE-2025-38079
- Published
- Jun 18, 2025
- Updated
- Aug 5, 2026
- Vendor
- Siemens
- Product
- SIPLUS S7-1500 CPU 1518-4 PN/DP MFP
- Classifications
- CWE-415, T1068
- Attack vector
- local
- Privileges
- authenticated
Timeline
How it unfolded
- Jun 18, 2025CVE 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?
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- Affected versionversion=V3.1.5 <*
What conditions does exploitation require?
What is affected?
Published CVSS scores
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Attacks
What attackers are doing with it
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Public exploit references
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Technologies
Your stack
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Your stack
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