Tracker / CVE-2021-3490
CVE-2021-3490
Alta 7.8
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).
Prodotti e versioni affette
| canonical | ubuntu_linux |
|---|---|
| linux | linux_kernel |
| linux | linux_kernel · 5.10 → 5.10.37 |
| linux | linux_kernel · 5.11 → 5.11.21 |
| linux | linux_kernel · 5.12 → 5.12.4 |
Analisi
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