CVE-2024-26619

What it actually does

Incorrect ordering of kfree calls during RISC-V module loading creates a use-after-free condition allowing access to already-freed kernel memory.

Why it matters to the business

Kernel instability or potential arbitrary code execution on RISC-V Linux systems could lead to system crashes, service outages, or compromise, though public exploitation remains unlikely based on current metrics.

How an attack unfolds

An attacker supplies a malicious kernel module or triggers module load/unload sequences that hit the reversed kfree order, resulting in a use-after-free that may be leveraged for memory corruption and privilege escalation.

How to fix it

Upgrade the Linux kernel package to version 5.10.178-1 or later on Debian 11 systems; rebuild and reboot with the patched kernel.

How to confirm the fix worked

Verify the running kernel version is at or above the fixed release and confirm the patch is present in the source tree for the riscv module loader.

Typical attack path

1. Identify RISC-V Linux system running an affected kernel version
2. Craft or load a module that exercises the module loading path
3. Trigger the incorrect free order to create the use-after-free
4. Exploit the dangling reference for memory corruption or control flow hijack

How to detect it

Review kernel logs and module load traces for unexpected oops or use-after-free reports on RISC-V systems; no widespread in-the-wild indicators have been published.

What your security team should do

• Prioritize patching RISC-V systems to the fixed kernel version within standard maintenance windows
• Monitor EPSS and KEV status for any future rise in exploit activity
• Restrict unprivileged module loading where feasible until patched