CVE-2024-50203 bpf, arm64: Fix address emission with tag-based KASAN enabled
A heap buffer overflow in the Linux kernel's BPF subsystem on ARM64 with tag-based KASAN enabled allows attackers to potentially execute arbitrary code or escalate privileges.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2024-50203?
CVE-2024-50203 is a high-severity memory corruption vulnerability in Linux kernel, published on 8 Nov 2024. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
In the Linux kernel, the following vulnerability has been resolved:
bpf, arm64: Fix address emission with tag-based KASAN enabled
When BPF_TRAMP_F_CALL_ORIG is enabled, the address of a bpf_tramp_image struct on the stack is passed during the size calculation pass and an address on the heap is passed during code generation. This may cause a heap buffer overflow if the heap address is tagged because emit_a64_mov_i64() will emit longer code than it did during the size calculation pass. The same problem could occur without tag-based KASAN if one of the 16-bit words of the stack address happened to be all-ones during the size calculation pass. Fix the problem by assuming the worst case (4 instructions) when calculating the size of the bpf_tramp_image address emission.
Weakness: CWE-787
Which versions are affected by CVE-2024-50203?
It affects 1 product.
Products include Linux kernel.
How do I fix CVE-2024-50203?
Apply the vendor's patch.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2024-50203 being exploited?
There is no known exploitation of CVE-2024-50203 in the wild and no public exploit code.
Other vulnerabilities in Linux kernel
Sources
Also known as BELL-CVE-2024-50203, DEBIAN-CVE-2024-50203, GHSA-w83r-gj25-6vrc, UBUNTU-CVE-2024-50203.