CVE-2021-47170 - OpenCVE

In the Linux kernel, the following vulnerability has been resolved: USB: usbfs: Don't WARN about excessively large memory allocations Syzbot found that the kernel generates a WARNing if the user tries to submit a bulk transfer through usbfs with a buffer that is way too large. This isn't a bug in the kernel; it's merely an invalid request from the user and the usbfs code does handle it correctly. In theory the same thing can happen with async transfers, or with the packet descriptor table for isochronous transfers. To prevent the MM subsystem from complaining about these bad allocation requests, add the __GFP_NOWARN flag to the kmalloc calls for these buffers.

No CVSS v4.0

Attack Vector Local

Attack Complexity Low

Privileges Required High

Scope Unchanged

Confidentiality Impact None

Integrity Impact None

Availability Impact High

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

Key SSVC decision points have not yet been added.

No data.

No data.

No data.

References

Link	Providers
https://git.kernel.org/stable/c/2ab21d6e1411999b5fb43434f421f00bf50002eb
https://git.kernel.org/stable/c/2c835fede13e03f2743a333e4370b5ed2db91e83
https://git.kernel.org/stable/c/4f2629ea67e7225c3fd292c7fe4f5b3c9d6392de
https://git.kernel.org/stable/c/8d83f109e920d2776991fa142bb904d985dca2ed
https://git.kernel.org/stable/c/9f7cb3f01a10d9064cf13b3d26fb7e7a5827d098
https://lore.kernel.org/linux-cve-announce/2024032536-CVE-2021-47170-ee51@gregkh/T
https://nvd.nist.gov/vuln/detail/CVE-2021-47170
https://www.cve.org/CVERecord?id=CVE-2021-47170

History

Wed, 11 Sep 2024 18:30:00 +0000

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

Wed, 11 Sep 2024 13:30:00 +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: 2024-03-25T09:16:22.313Z

Updated: 2024-11-04T12:00:46.330Z

Reserved: 2024-03-25T09:12:14.111Z

Link: CVE-2021-47170

Vulnrichment

Updated: 2024-08-04T05:24:40.234Z

NVD

Status : Awaiting Analysis

Published: 2024-03-25T10:15:08.870

Modified: 2024-03-25T13:47:14.087

Link: CVE-2021-47170

Redhat

Severity : Low

Publid Date: 2024-03-25T00:00:00Z

Links: CVE-2021-47170 - Bugzilla

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{"bugzilla": {"description": "kernel: USB: usbfs: Don't WARN about excessively large memory allocations", "id": "2271470", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2271470"}, "csaw": false, "cvss3": {"cvss3_base_score": "4.4", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-20", "details": ["In the Linux kernel, the following vulnerability has been resolved:\nUSB: usbfs: Don't WARN about excessively large memory allocations\nSyzbot found that the kernel generates a WARNing if the user tries to\nsubmit a bulk transfer through usbfs with a buffer that is way too\nlarge. This isn't a bug in the kernel; it's merely an invalid request\nfrom the user and the usbfs code does handle it correctly.\nIn theory the same thing can happen with async transfers, or with the\npacket descriptor table for isochronous transfers.\nTo prevent the MM subsystem from complaining about these bad\nallocation requests, add the __GFP_NOWARN flag to the kmalloc calls\nfor these buffers."], "name": "CVE-2021-47170", "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": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2024-03-25T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2021-47170\nhttps://nvd.nist.gov/vuln/detail/CVE-2021-47170\nhttps://lore.kernel.org/linux-cve-announce/2024032536-CVE-2021-47170-ee51@gregkh/T"], "threat_severity": "Low", "upstream_fix": "kernel 4.19.193, kernel 5.4.124, kernel 5.10.42, kernel 5.12.9, kernel 5.13"}