CVE-2021-47444 - OpenCVE

In the Linux kernel, the following vulnerability has been resolved: drm/edid: In connector_bad_edid() cap num_of_ext by num_blocks read In commit e11f5bd8228f ("drm: Add support for DP 1.4 Compliance edid corruption test") the function connector_bad_edid() started assuming that the memory for the EDID passed to it was big enough to hold `edid[0x7e] + 1` blocks of data (1 extra for the base block). It completely ignored the fact that the function was passed `num_blocks` which indicated how much memory had been allocated for the EDID. Let's fix this by adding a bounds check. This is important for handling the case where there's an error in the first block of the EDID. In that case we will call connector_bad_edid() without having re-allocated memory based on `edid[0x7e]`.

No CVSS v4.0

Attack Vector Adjacent Network

Attack Complexity Low

Privileges Required High

Scope Unchanged

Confidentiality Impact None

Integrity Impact Low

Availability Impact High

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

Exploitation none

Automatable no

Technical Impact partial

No data.

No data.

No data.

References

Link	Providers
https://git.kernel.org/stable/c/09f3946bb452918dbfb1982add56f9ffaae393dc
https://git.kernel.org/stable/c/97794170b696856483f74b47bfb6049780d2d3a0
https://git.kernel.org/stable/c/a7b45024f66f9ec769e8dbb1a51ae83cd05929c7
https://nvd.nist.gov/vuln/detail/CVE-2021-47444
https://www.cve.org/CVERecord?id=CVE-2021-47444

History

Mon, 04 Nov 2024 12:15:00 +0000

Type	Values Removed	Values Added
Metrics		ssvc `{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}`

MITRE

Status: PUBLISHED

Assigner: Linux

Published: 2024-05-22T06:19:37.533Z

Updated: 2024-11-04T12:06:01.384Z

Reserved: 2024-05-21T14:58:30.832Z

Link: CVE-2021-47444

Vulnrichment

Updated: 2024-08-04T05:39:59.303Z

NVD

Status : Awaiting Analysis

Published: 2024-05-22T07:15:09.660

Modified: 2024-05-22T12:46:53.887

Link: CVE-2021-47444

Redhat

Severity : Moderate

Publid Date: 2024-05-22T00:00:00Z

Links: CVE-2021-47444 - Bugzilla

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{"bugzilla": {"description": "kernel: drm/edid: In connector_bad_edid() cap num_of_ext by num_blocks read", "id": "2282848", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2282848"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.2", "cvss3_scoring_vector": "CVSS:3.1/AV:A/AC:L/PR:H/UI:N/S:U/C:N/I:L/A:H", "status": "draft"}, "cwe": "CWE-787", "details": ["In the Linux kernel, the following vulnerability has been resolved:\ndrm/edid: In connector_bad_edid() cap num_of_ext by num_blocks read\nIn commit e11f5bd8228f (\"drm: Add support for DP 1.4 Compliance edid\ncorruption test\") the function connector_bad_edid() started assuming\nthat the memory for the EDID passed to it was big enough to hold\n`edid[0x7e] + 1` blocks of data (1 extra for the base block). It\ncompletely ignored the fact that the function was passed `num_blocks`\nwhich indicated how much memory had been allocated for the EDID.\nLet's fix this by adding a bounds check.\nThis is important for handling the case where there's an error in the\nfirst block of the EDID. In that case we will call\nconnector_bad_edid() without having re-allocated memory based on\n`edid[0x7e]`."], "name": "CVE-2021-47444", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Out of support scope", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Out of support scope", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Out of support scope", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2024-05-22T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2021-47444\nhttps://nvd.nist.gov/vuln/detail/CVE-2021-47444"], "threat_severity": "Moderate", "upstream_fix": "kernel 5.10.75, kernel 5.14.14, kernel 5.15"}