Local kernel memory corruption via uninitialized pointer free
Published Aug 15, 2026 · Updated Aug 15, 2026
Memory corruption in Linux kernel 5.5 allows local users to trigger a double-free through pinctrl device-tree map cleanup. On a partial dt_remember_or_free_map() failure, dt_free_map() passes uninitialized dev_name entries from kmalloc()-allocated maps to kfree_const(). Reachability requires an allocation failure while binding a pinctrl-consuming device whose driver leaves those entries uninitialized; the demonstrated consequence is a KASAN-detected double-free.
Summary
What happened
Memory corruption in Linux kernel 5.5 allows local users to trigger a double-free through pinctrl device-tree map cleanup. On a partial dt_remember_or_free_map() failure, dt_free_map() passes uninitialized dev_name entries from kmalloc()-allocated maps to kfree_const(). Reachability requires an allocation failure while binding a pinctrl-consuming device whose driver leaves those entries uninitialized; the demonstrated consequence is a KASAN-detected double-free.
The record
- CVE
- CVE-2026-74519
- Published
- Aug 15, 2026
- Updated
- Aug 15, 2026
- Vendor
- The Linux Kernel Organization
- Product
- Linux
- Classifications
- Unavailable
- Attack vector
- local
- Privileges
- authenticated
Timeline
How it unfolded
- Aug 15, 2026CVE publishedPublication date reported by the CVE source.
- Aug 15, 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=03f69244302d7954f42f528ea2d45903ebbf59f3
- Affected versionversion=4.14.161 <4.15
- Affected versionversion=4.19.92 <4.20
- Affected versionversion=4.4.244 <4.5
- Affected versionversion=4.9.244 <4.10
- Affected versionversion=5.4.7 <5.5
- Affected versionversion=5.5
- Affected versionversion=679c4f27b8958b65bb51d1c3dfdbf3befe4a33a3
- Affected versionversion=77440c3a37203e3f4667d06e37f76ef3968d2d8c
- Affected versionversion=be4c60b563edee3712d392aaeb0943a768df7023 <015b5bcbcb622b32317642be91a7f79aa5413649
- Affected versionversion=be4c60b563edee3712d392aaeb0943a768df7023 <321fe3584a8298386938130d138191aa35040b75
- Affected versionversion=be4c60b563edee3712d392aaeb0943a768df7023 <929f6396baade89999ec8a1281232c101cbc727d
- Affected versionversion=be4c60b563edee3712d392aaeb0943a768df7023 <9d00a5ac7cd3d32ae61140f4b8a62f136de84e7d
- Affected versionversion=be4c60b563edee3712d392aaeb0943a768df7023 <ad0ad3c228b6f76fde10f32047e0ec5fbc109dc8
- Affected versionversion=f739a699db7d5a5cf39ca3ce2c84e4fe4a8f4c5d
- Affected versionversion=f88ac1330779c5bfdd79f7d7f7d4d3343c782f92
What conditions does exploitation require?
What is affected?
Published CVSS scores
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Attacks
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