The eBPF RINGBUF bpf_ringbuf_reserve() function in the Linux kernel did not check that the allocated size was smaller than the ringbuf size, allowing an malicious user to perform out-of-bounds writes within the kernel and therefore, arbitrary code execution. This issue was fixed via commit 4b81ccebaeee ("bpf, ringbuf: Deny reserve of buffers larger than ringbuf") (v5.13-rc4) and backported to the stable kernels in v5.12.4, v5.11.21, and v5.10.37. It was introduced via 457f44363a88 ("bpf: Implement BPF ring buffer and verifier support for it") (v5.8-rc1).
| Vulnerable Product | Search on Vulmon | Subscribe to Product |
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linux linux kernel |
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linux linux kernel 5.13 |
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canonical ubuntu linux 20.04 |
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canonical ubuntu linux 20.10 |
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canonical ubuntu linux 21.04 |
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