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CVE PROGRAM SOURCE RECORD7.8 High

CVE-2021-3489

Linux kernel eBPF RINGBUF map oversized allocation

Read JSON ↗CVE.org ↗
Status
Published
Published
Updated
Assigning organization
canonical

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

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

Linux Linux kernel

  • trunk to < v5.13-rc4affected
  • linux-5.12.y to < v5.12.4affected
  • linux-5.11.y to < v5.11.21affected
  • linux-5.10.y to < v5.10.37affected
  • v5.8 to < 5.8*affected

References