ghsa-9wfm-q59x-qc3x
Vulnerability from github
Published
2022-05-24 19:04
Modified
2022-05-24 19:04
Details

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).

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{
   affected: [],
   aliases: [
      "CVE-2021-3490",
   ],
   database_specific: {
      cwe_ids: [
         "CWE-125",
      ],
      github_reviewed: false,
      github_reviewed_at: null,
      nvd_published_at: "2021-06-04T02:15:00Z",
      severity: "HIGH",
   },
   details: "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).",
   id: "GHSA-9wfm-q59x-qc3x",
   modified: "2022-05-24T19:04:07Z",
   published: "2022-05-24T19:04:07Z",
   references: [
      {
         type: "ADVISORY",
         url: "https://nvd.nist.gov/vuln/detail/CVE-2021-3490",
      },
      {
         type: "WEB",
         url: "https://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf.git/commit/?id=049c4e13714ecbca567b4d5f6d563f05d431c80e",
      },
      {
         type: "WEB",
         url: "https://security.netapp.com/advisory/ntap-20210716-0004",
      },
      {
         type: "WEB",
         url: "https://ubuntu.com/security/notices/USN-4949-1",
      },
      {
         type: "WEB",
         url: "https://ubuntu.com/security/notices/USN-4950-1",
      },
      {
         type: "WEB",
         url: "https://www.openwall.com/lists/oss-security/2021/05/11/11",
      },
      {
         type: "WEB",
         url: "https://www.zerodayinitiative.com/advisories/ZDI-21-606",
      },
      {
         type: "WEB",
         url: "http://packetstormsecurity.com/files/164015/Linux-eBPF-ALU32-32-bit-Invalid-Bounds-Tracking-Local-Privilege-Escalation.html",
      },
   ],
   schema_version: "1.4.0",
   severity: [],
}


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