CVE-2024-56556: 
Linux Debian vulnerability analysis and mitigation

CVE-2024-56556 is a vulnerability in the Linux kernel's binder subsystem, specifically in the binderaddfreeze_work() function. The vulnerability was discovered and disclosed on December 27, 2024, affecting Linux kernel versions up to 6.12.4. This use-after-free vulnerability occurs due to a race condition in the lock handling mechanism (NVD).

The vulnerability stems from a race condition in the binderaddfreezework() function where the proc->innerlock is temporarily dropped to acquire the node->lock first due to lock nesting order requirements. This can race with bindernoderelease() and trigger a use-after-free condition. The issue manifests as a KASAN slab-use-after-free error in the rawspin_lock function. The vulnerability has received a CVSS v3.1 base score of 7.0 (High) with vector: CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H (NVD).

The vulnerability could lead to a use-after-free condition in the Linux kernel's binder subsystem, potentially allowing an attacker with local access to cause system instability or execute arbitrary code with elevated privileges (NVD).

The vulnerability has been patched by taking a temporary reference on the node before releasing the proc->inner lock, ensuring the node remains alive while in use. The fix was implemented through kernel patches and is available in updated kernel versions (Kernel Patch).