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CVE PROGRAM SOURCE RECORD7.8 High

CVE-2021-3490

Linux kernel eBPF bitwise ops ALU32 bounds tracking

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Status
Published
Published
Updated
Assigning organization
canonical

Description

The eBPF ALU32 bounds tracking for bitwise ops (AND, OR and XOR) in the Linux kernel did not properly update 32-bit bounds, which could be turned into out of bounds reads and writes in the Linux kernel and therefore, arbitrary code execution. This issue was fixed via commit 049c4e13714e ("bpf: Fix alu32 const subreg bound tracking on bitwise operations") (v5.13-rc4) and backported to the stable kernels in v5.12.4, v5.11.21, and v5.10.37. The AND/OR issues were introduced by commit 3f50f132d840 ("bpf: Verifier, do explicit ALU32 bounds tracking") (5.7-rc1) and the XOR variant was introduced by 2921c90d4718 ("bpf:Fix a verifier failure with xor") ( 5.10-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
  • v5.7-rc1 to < 5.7*affected

References