CVE-2021-47486 riscv, bpf: Fix potential NULL dereference

What is CVE-2021-47486?

CVE-2021-47486 is a high-severity vulnerability in Linux kernel, published on 22 May 2024. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

In the Linux kernel, the following vulnerability has been resolved:

riscv, bpf: Fix potential NULL dereference

The bpf_jit_binary_free() function requires a non-NULL argument. When the RISC-V BPF JIT fails to converge in NR_JIT_ITERATIONS steps, jit_data->header will be NULL, which triggers a NULL dereference. Avoid this by checking the argument, prior calling the function.

Weakness: CWE-476

Which versions are affected by CVE-2021-47486?

It affects 1 product.

Products include Linux kernel.

How do I fix CVE-2021-47486?

Apply the vendor's patch.

Is CVE-2021-47486 being exploited?

There is no known exploitation of CVE-2021-47486 in the wild and no public exploit code.

Other vulnerabilities in Linux kernel

• CVE-2026-53266 Linux Kernel Out-of-Bounds Write Exploited High 8.8
• CVE-2013-6282 Linux Kernel Improper Input Validation Exploited High 8.8
• CVE-2022-0185 Linux Kernel Heap-Based Buffer Overflow Exploited High 8.4
• CVE-2013-2094 Linux Kernel Privilege Escalation Exploited High 8.4
• CVE-2026-53362 Linux Kernel Unspecified Exploited High 7.8

All Linux kernel vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as DEBIAN-CVE-2021-47486, GHSA-h8rm-f377-9c5v, UBUNTU-CVE-2021-47486.