CVE-2026-74519
Description
In the Linux kernel, the following vulnerability has been resolved: pinctrl: devicetree: don't free uninitialized dev_name on error path dt_remember_or_free_map() duplicates dev_name for each map entry. If kstrdup_const() fails, dt_free_map() frees dev_name in all num_maps entries, including entries that have not been initialized. Some pinctrl drivers, including pinctrl-imx, allocate the map with kmalloc() and leave dev_name for the core to initialize. The untouched entries therefore contain uninitialized data which is passed to kfree_const(). Reproduced on qemu's mcimx6ul-evk (pinctrl-imx) with failslab injection while binding the pinctrl-consuming device, under KASAN: BUG: KASAN: double-free in dt_free_map+0x34/0xa4 Free of addr c425a900 by task init/1 kfree from dt_free_map+0x34/0xa4 dt_free_map from dt_remember_or_free_map+0x184/0x198 dt_remember_or_free_map from pinctrl_dt_to_map+0x33c/0x4c8 pinctrl_dt_to_map from create_pinctrl+0x9c/0x5c0 Initialize all dev_name fields to NULL before duplicating the device name, making the full-map cleanup safe after a partial failure.
How to fix
- Linux Linuxe3cfb22bad363bebcfd55d909e12d499cb8c5490, 1586423da2739a80871ef6240016fcb9c7339bfb, dec5f0a8080502908dec5e35597c7ae07d533a3b, 929f6396baade89999ec8a1281232c101cbc727d, 321fe3584a8298386938130d138191aa35040b75, ad0ad3c228b6f76fde10f32047e0ec5fbc109dc8, 9d00a5ac7cd3d32ae61140f4b8a62f136de84e7d, 015b5bcbcb622b32317642be91a7f79aa5413649, 4.5, 4.10, 4.15, 4.20, 5.5 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| Linux Linux | be4c60b563edee3712d392aaeb0943a768df7023 ≤ v < e3cfb22bad363bebcfd55d909e12d499cb8c5490, be4c60b563edee3712d392aaeb0943a768df7023 ≤ v < 1586423da2739a80871ef6240016fcb9c7339bfb, be4c60b563edee3712d392aaeb0943a768df7023 ≤ v < dec5f0a8080502908dec5e35597c7ae07d533a3b, be4c60b563edee3712d392aaeb0943a768df7023 ≤ v < 929f6396baade89999ec8a1281232c101cbc727d, be4c60b563edee3712d392aaeb0943a768df7023 ≤ v < 321fe3584a8298386938130d138191aa35040b75, be4c60b563edee3712d392aaeb0943a768df7023 ≤ v < ad0ad3c228b6f76fde10f32047e0ec5fbc109dc8, be4c60b563edee3712d392aaeb0943a768df7023 ≤ v < 9d00a5ac7cd3d32ae61140f4b8a62f136de84e7d, be4c60b563edee3712d392aaeb0943a768df7023 ≤ v < 015b5bcbcb622b32317642be91a7f79aa5413649, 03f69244302d7954f42f528ea2d45903ebbf59f3, 77440c3a37203e3f4667d06e37f76ef3968d2d8c, 679c4f27b8958b65bb51d1c3dfdbf3befe4a33a3, f88ac1330779c5bfdd79f7d7f7d4d3343c782f92, f739a699db7d5a5cf39ca3ce2c84e4fe4a8f4c5d, 4.4.244 ≤ v < 4.5, 4.9.244 ≤ v < 4.10, 4.14.161 ≤ v < 4.15, 4.19.92 ≤ v < 4.20, 5.4.7 ≤ v < 5.5, 5.5 | e3cfb22bad363bebcfd55d909e12d499cb8c5490, 1586423da2739a80871ef6240016fcb9c7339bfb, dec5f0a8080502908dec5e35597c7ae07d533a3b, 929f6396baade89999ec8a1281232c101cbc727d, 321fe3584a8298386938130d138191aa35040b75, ad0ad3c228b6f76fde10f32047e0ec5fbc109dc8, 9d00a5ac7cd3d32ae61140f4b8a62f136de84e7d, 015b5bcbcb622b32317642be91a7f79aa5413649, 4.5, 4.10, 4.15, 4.20, 5.5 |
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