CVE-2021-3489 (GCVE-0-2021-3489)
Vulnerability from cvelistv5
Published
2021-06-04 01:40
Modified
2024-09-16 20:21
Severity ?
7.8 (High) - CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H
CWE
  • CWE-119 - Improper Restriction of Operations within the Bounds of a Memory Buffer
  • CWE-787 - Out-of-bounds Write
Summary
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).
References
Impacted products
Vendor Product Version
Linux Linux kernel Version: trunk   < v5.13-rc4
Version: linux-5.12.y   < v5.12.4
Version: linux-5.11.y   < v5.11.21
Version: linux-5.10.y   < v5.10.37
Version: v5.8   < 5.8*
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