CVE-2021-3490 (GCVE-0-2021-3490)

Vulnerability from cvelistv5 – Published: 2021-06-04 01:40 – Updated: 2024-09-16 22:29
VLAI?
Title
Linux kernel eBPF bitwise ops ALU32 bounds tracking
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).
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
Assigner
References
Impacted products
Vendor Product Version
Linux Linux kernel Affected: trunk , < v5.13-rc4 (custom)
Affected: linux-5.12.y , < v5.12.4 (custom)
Affected: linux-5.11.y , < v5.11.21 (custom)
Affected: linux-5.10.y , < v5.10.37 (custom)
Affected: v5.7-rc1 , < 5.7* (custom)
Create a notification for this product.
Credits
Manfred Paul (@_manfp) of the RedRocket CTF team (@redrocket_ctf) working with Trend Micro's Zero Day Initiative
Show details on NVD website
To clipboard 

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      "references": "[{\"url\": \"http://packetstormsecurity.com/files/164015/Linux-eBPF-ALU32-32-bit-Invalid-Bounds-Tracking-Local-Privilege-Escalation.html\", \"source\": \"security@ubuntu.com\", \"tags\": [\"Exploit\", \"Third Party Advisory\", \"VDB Entry\"]}, {\"url\": \"https://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf.git/commit/?id=049c4e13714ecbca567b4d5f6d563f05d431c80e\", \"source\": \"security@ubuntu.com\", \"tags\": [\"Patch\", \"Vendor Advisory\"]}, {\"url\": \"https://security.netapp.com/advisory/ntap-20210716-0004/\", \"source\": \"security@ubuntu.com\", \"tags\": [\"Third Party Advisory\"]}, {\"url\": \"https://ubuntu.com/security/notices/USN-4949-1\", \"source\": \"security@ubuntu.com\", \"tags\": [\"Third Party Advisory\"]}, {\"url\": \"https://ubuntu.com/security/notices/USN-4950-1\", \"source\": \"security@ubuntu.com\", \"tags\": [\"Third Party Advisory\"]}, {\"url\": \"https://www.openwall.com/lists/oss-security/2021/05/11/11\", \"source\": \"security@ubuntu.com\", \"tags\": [\"Mailing List\", \"Patch\", \"Third Party Advisory\"]}, {\"url\": \"https://www.zerodayinitiative.com/advisories/ZDI-21-606/\", \"source\": \"security@ubuntu.com\", \"tags\": [\"Third Party Advisory\", \"VDB Entry\"]}, {\"url\": \"http://packetstormsecurity.com/files/164015/Linux-eBPF-ALU32-32-bit-Invalid-Bounds-Tracking-Local-Privilege-Escalation.html\", \"source\": \"af854a3a-2127-422b-91ae-364da2661108\", \"tags\": [\"Exploit\", \"Third Party Advisory\", \"VDB Entry\"]}, {\"url\": \"https://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf.git/commit/?id=049c4e13714ecbca567b4d5f6d563f05d431c80e\", \"source\": \"af854a3a-2127-422b-91ae-364da2661108\", \"tags\": [\"Patch\", \"Vendor Advisory\"]}, {\"url\": \"https://security.netapp.com/advisory/ntap-20210716-0004/\", \"source\": \"af854a3a-2127-422b-91ae-364da2661108\", \"tags\": [\"Third Party Advisory\"]}, {\"url\": \"https://ubuntu.com/security/notices/USN-4949-1\", \"source\": \"af854a3a-2127-422b-91ae-364da2661108\", \"tags\": [\"Third Party Advisory\"]}, {\"url\": \"https://ubuntu.com/security/notices/USN-4950-1\", \"source\": \"af854a3a-2127-422b-91ae-364da2661108\", \"tags\": [\"Third Party Advisory\"]}, {\"url\": \"https://www.openwall.com/lists/oss-security/2021/05/11/11\", \"source\": \"af854a3a-2127-422b-91ae-364da2661108\", \"tags\": [\"Mailing List\", \"Patch\", \"Third Party Advisory\"]}, {\"url\": \"https://www.zerodayinitiative.com/advisories/ZDI-21-606/\", \"source\": \"af854a3a-2127-422b-91ae-364da2661108\", \"tags\": [\"Third Party Advisory\", \"VDB Entry\"]}]",
      "sourceIdentifier": "security@ubuntu.com",
      "vulnStatus": "Modified",
      "weaknesses": "[{\"source\": \"security@ubuntu.com\", \"type\": \"Secondary\", \"description\": [{\"lang\": \"en\", \"value\": \"CWE-20\"}, {\"lang\": \"en\", \"value\": \"CWE-787\"}]}, {\"source\": \"nvd@nist.gov\", \"type\": \"Primary\", \"description\": [{\"lang\": \"en\", \"value\": \"CWE-125\"}, {\"lang\": \"en\", \"value\": \"CWE-787\"}]}]"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2021-3490\",\"sourceIdentifier\":\"security@ubuntu.com\",\"published\":\"2021-06-04T02:15:07.150\",\"lastModified\":\"2024-11-21T06:21:39.897\",\"vulnStatus\":\"Modified\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"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. 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  }
}


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Sightings

Author Source Type Date

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



Detection rules are retrieved from Rulezet.