CVE-2021-3489 (GCVE-0-2021-3489)

Vulnerability from cvelistv5 – Published: 2021-06-04 01:40 – Updated: 2024-09-16 20:21
VLAI?
Title
Linux kernel eBPF RINGBUF map oversized allocation
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).
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
Assigner
References
Impacted products
Vendor Product Version
Linux Linux kernel Affected: trunk , < v5.13-rc4 (custom)
Affected: linux-5.12.y , < v5.12.4 (custom)
Affected: linux-5.11.y , < v5.11.21 (custom)
Affected: linux-5.10.y , < v5.10.37 (custom)
Affected: v5.8 , < 5.8* (custom)
Create a notification for this product.
Credits
Ryota Shiga (@Ga_ryo_) of Flatt Security working with Trend Micro's Zero Day Initiative
Show details on NVD website
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  • Confirmed: The vulnerability has been validated from an analyst's perspective.
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