CVE-2021-3490 (GCVE-0-2021-3490)
Vulnerability from cvelistv5
Published
2021-06-04 01:40
Modified
2024-09-16 22:29
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-787 - Out-of-bounds Write
  • CWE-20 - Improper Input Validation
Summary
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).
References
Impacted products
Vendor Product Version
Linux Linux kernel Version: trunk   < v5.13-rc4
Version: linux-5.12.y   < v5.12.4
Version: linux-5.11.y   < v5.11.21
Version: linux-5.10.y   < v5.10.37
Version: v5.7-rc1   < 5.7*
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