GSD-2020-8835
Vulnerability from gsd - Updated: 2023-12-13 01:21Details
In the Linux kernel 5.5.0 and newer, the bpf verifier (kernel/bpf/verifier.c) did not properly restrict the register bounds for 32-bit operations, leading to out-of-bounds reads and writes in kernel memory. The vulnerability also affects the Linux 5.4 stable series, starting with v5.4.7, as the introducing commit was backported to that branch. This vulnerability was fixed in 5.6.1, 5.5.14, and 5.4.29. (issue is aka ZDI-CAN-10780)
Aliases
Aliases
{
"GSD": {
"alias": "CVE-2020-8835",
"description": "In the Linux kernel 5.5.0 and newer, the bpf verifier (kernel/bpf/verifier.c) did not properly restrict the register bounds for 32-bit operations, leading to out-of-bounds reads and writes in kernel memory. The vulnerability also affects the Linux 5.4 stable series, starting with v5.4.7, as the introducing commit was backported to that branch. This vulnerability was fixed in 5.6.1, 5.5.14, and 5.4.29. (issue is aka ZDI-CAN-10780)",
"id": "GSD-2020-8835",
"references": [
"https://www.suse.com/security/cve/CVE-2020-8835.html",
"https://ubuntu.com/security/CVE-2020-8835",
"https://advisories.mageia.org/CVE-2020-8835.html",
"https://security.archlinux.org/CVE-2020-8835",
"https://linux.oracle.com/cve/CVE-2020-8835.html"
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"modified": "2023-12-13T01:21:53.654322Z",
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"TITLE": "Linux kernel bpf verifier vulnerability"
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"solution": [
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"lang": "eng",
"value": "Revert commit 581738a681b6 (\"bpf: Provide better register bounds after jmp32 instructions\")."
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"value": "Mitigation for this vulnerability is available by setting the kernel.unprivileged_bpf_disabled sysctl to 1:\n\n $ sudo sysctl kernel.unprivileged_bpf_disabled=1\n $ echo kernel.unprivileged_bpf_disabled=1 | sudo tee /etc/sysctl.d/90-CVE-2020-8835.conf\n\nThis issue is also mitigated on systems that use secure boot with the kernel lockdown feature which blocks BPF program loading."
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"children": [],
"cpe_match": [
{
"cpe23Uri": "cpe:2.3:h:netapp:h615c:-:*:*:*:*:*:*:*",
"cpe_name": [],
"vulnerable": false
}
],
"operator": "OR"
}
],
"cpe_match": [],
"operator": "AND"
}
]
},
"cve": {
"CVE_data_meta": {
"ASSIGNER": "security@ubuntu.com",
"ID": "CVE-2020-8835"
},
"data_format": "MITRE",
"data_type": "CVE",
"data_version": "4.0",
"description": {
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"value": "In the Linux kernel 5.5.0 and newer, the bpf verifier (kernel/bpf/verifier.c) did not properly restrict the register bounds for 32-bit operations, leading to out-of-bounds reads and writes in kernel memory. The vulnerability also affects the Linux 5.4 stable series, starting with v5.4.7, as the introducing commit was backported to that branch. This vulnerability was fixed in 5.6.1, 5.5.14, and 5.4.29. (issue is aka ZDI-CAN-10780)"
}
]
},
"problemtype": {
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},
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]
},
"references": {
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{
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},
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"url": "https://lore.kernel.org/bpf/20200330160324.15259-1-daniel@iogearbox.net/T/"
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},
{
"name": "FEDORA-2020-666f3b1ac3",
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"cvssV2": {
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"accessVector": "LOCAL",
"authentication": "NONE",
"availabilityImpact": "COMPLETE",
"baseScore": 7.2,
"confidentialityImpact": "COMPLETE",
"integrityImpact": "COMPLETE",
"vectorString": "AV:L/AC:L/Au:N/C:C/I:C/A:C",
"version": "2.0"
},
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"impactScore": 10.0,
"obtainAllPrivilege": false,
"obtainOtherPrivilege": false,
"obtainUserPrivilege": false,
"severity": "HIGH",
"userInteractionRequired": false
},
"baseMetricV3": {
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"attackVector": "LOCAL",
"availabilityImpact": "HIGH",
"baseScore": 7.8,
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"confidentialityImpact": "HIGH",
"integrityImpact": "HIGH",
"privilegesRequired": "LOW",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
"version": "3.1"
},
"exploitabilityScore": 1.8,
"impactScore": 5.9
}
},
"lastModifiedDate": "2023-02-24T18:42Z",
"publishedDate": "2020-04-02T18:15Z"
}
}
}
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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.
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