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CVE-2021-3490 The eBPF ALU32 bounds tracking for bitwise ops (AND, OR and XOR) in the Linux kernel did not properly update 32-bit…

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).

Produits et versions touchés

Produit Versions touchées Corrigé en
Linux Kernel 5.13 premières → < 5.13-rc4 5.13-rc4
Linux Kernel 5.12 premières → < 5.12.4 5.12.4
Linux Kernel 5.11 premières → < 5.11.21 5.11.21
Linux Kernel 5.10 premières → < 5.10.37 5.10.37
Linux Kernel 5.7 5.7-rc1 → dernières Pas de correctif indiqué

Références

Chronologie

  1. Publiée
  2. Dernière modification

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