CVE-2026-68435
Description
In the Linux kernel, the following vulnerability has been resolved: LoongArch: Fix address space mismatch in kexec command line lookup When searching the loaded segments for the "kexec" command line marker, the kexec_load(2) path (file_mode == 0) passes the user-space segment buffer straight to strncmp() through a bogus (char __user *) cast. This dereferences a user pointer in kernel context, which is wrong and is flagged by sparse: arch/loongarch/kernel/machine_kexec.c:84:51: sparse: incorrect type in argument 2 (different address spaces) @@ expected char const * @@ got char [noderef] __user * Here copy the marker-sized prefix of each segment into a small on-stack buffer with copy_from_user() before comparing, and skip segments that fault. The subsequent copy_from_user() that stages the full command line into the safe area is left unchanged.
How to fix
- Linux Linux742f2c0a64a7557495e831c3c112d92e308bd4ae, 3b71f51fa3a247921408879eab2ddee82da8a980, eaa908d8d523b0ab75dab5ebd6662e70af5e5d7e, a94d6726ec8680a2b0c453fc782a543f68a1ea06, 7a54e0cbaad4a5a09e7cc7a4f05d181048e98ca7, 485ed44db5694d8d2e5027f63ad608e705286f30 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| Linux Linux | 4a03b2ac06a5bcae29371866d9d11f5bfd4c9188 ≤ v < 742f2c0a64a7557495e831c3c112d92e308bd4ae, 4a03b2ac06a5bcae29371866d9d11f5bfd4c9188 ≤ v < 3b71f51fa3a247921408879eab2ddee82da8a980, 4a03b2ac06a5bcae29371866d9d11f5bfd4c9188 ≤ v < eaa908d8d523b0ab75dab5ebd6662e70af5e5d7e, 4a03b2ac06a5bcae29371866d9d11f5bfd4c9188 ≤ v < a94d6726ec8680a2b0c453fc782a543f68a1ea06, 4a03b2ac06a5bcae29371866d9d11f5bfd4c9188 ≤ v < 7a54e0cbaad4a5a09e7cc7a4f05d181048e98ca7, 4a03b2ac06a5bcae29371866d9d11f5bfd4c9188 ≤ v < 485ed44db5694d8d2e5027f63ad608e705286f30, 6.1 | 742f2c0a64a7557495e831c3c112d92e308bd4ae, 3b71f51fa3a247921408879eab2ddee82da8a980, eaa908d8d523b0ab75dab5ebd6662e70af5e5d7e, a94d6726ec8680a2b0c453fc782a543f68a1ea06, 7a54e0cbaad4a5a09e7cc7a4f05d181048e98ca7, 485ed44db5694d8d2e5027f63ad608e705286f30 |
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