7.8
High
CVE-2021-3489 The eBPF RINGBUF bpf_ringbuf_reserve() function in the Linux kernel did not check that the allocated size was smaller…
Description
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 attacker 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).
Affected products and versions
| Product | Affected versions | Fixed in |
|---|---|---|
| Linux Kernel 5.13 | earliest → < 5.13-rc4 | 5.13-rc4 |
| Linux Kernel 5.12 | earliest → < 5.12.4 | 5.12.4 |
| Linux Kernel 5.11 | earliest → < 5.11.21 | 5.11.21 |
| Linux Kernel 5.10 | earliest → < 5.10.37 | 5.10.37 |
| Linux Kernel 5.8 | 5.8 → latest | No fix stated |
References
- [oss-security] CVE-2021-3489 - Linux kernel eBPF RINGBUF map oversized allocation www.openwall.com
- git.kernel.org git.kernel.org
- www.zerodayinitiative.com www.zerodayinitiative.com
- ubuntu.com ubuntu.com
- ubuntu.com ubuntu.com
- security.netapp.com security.netapp.com
Timeline
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