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7.8
HIGH CVSS 3.1
CVE-2021-47040
io_uring: fix overflows checks in provide buffers
Description

In the Linux kernel, the following vulnerability has been resolved: io_uring: fix overflows checks in provide buffers Colin reported before possible overflow and sign extension problems in io_provide_buffers_prep(). As Linus pointed out previous attempt did nothing useful, see d81269fecb8ce ("io_uring: fix provide_buffers sign extension"). Do that with help of check_<op>_overflow helpers. And fix struct io_provide_buf::len type, as it doesn't make much sense to keep it signed.

INFO

Published Date :

Feb. 28, 2024, 9:15 a.m.

Last Modified :

Jan. 9, 2025, 3:29 p.m.

Remotely Exploit :

No

Source :

416baaa9-dc9f-4396-8d5f-8c081fb06d67
Affected Products

The following products are affected by CVE-2021-47040 vulnerability. Even if cvefeed.io is aware of the exact versions of the products that are affected, the information is not represented in the table below.

ID Vendor Product Action
1 Linux linux_kernel
: Total Affected Vendor : 1 | Products : 1
CVSS Scores
The Common Vulnerability Scoring System is a standardized framework for assessing the severity of vulnerabilities in software and systems. We collect and displays CVSS scores from various sources for each CVE.
Score Version Severity Vector Exploitability Score Impact Score Source
CVSS 3.1 HIGH [email protected]
Solution
A vulnerability in the Linux kernel requires an update to the kernel packages.
  • Update the affected kernel packages.
  • Reboot the system after the update.
References to Advisories, Solutions, and Tools

Here, you will find a curated list of external links that provide in-depth information, practical solutions, and valuable tools related to CVE-2021-47040.

URL Resource
https://git.kernel.org/stable/c/38134ada0ceea3e848fe993263c0ff6207fd46e7 Patch
https://git.kernel.org/stable/c/51bf90901952aaac564bbdb36b2b503050c53dd9 Patch
https://git.kernel.org/stable/c/84b8c266c4bfe9ed5128e13253c388deb74b1b03 Patch
https://git.kernel.org/stable/c/cbbc13b115b8f18e0a714d89f87fbdc499acfe2d Patch
https://git.kernel.org/stable/c/38134ada0ceea3e848fe993263c0ff6207fd46e7 Patch
https://git.kernel.org/stable/c/51bf90901952aaac564bbdb36b2b503050c53dd9 Patch
https://git.kernel.org/stable/c/84b8c266c4bfe9ed5128e13253c388deb74b1b03 Patch
https://git.kernel.org/stable/c/cbbc13b115b8f18e0a714d89f87fbdc499acfe2d Patch
CWE - Common Weakness Enumeration

While CVE identifies specific instances of vulnerabilities, CWE categorizes the common flaws or weaknesses that can lead to vulnerabilities. CVE-2021-47040 is associated with the following CWEs:

Common Attack Pattern Enumeration and Classification (CAPEC)

Common Attack Pattern Enumeration and Classification (CAPEC) stores attack patterns, which are descriptions of the common attributes and approaches employed by adversaries to exploit the CVE-2021-47040 weaknesses.

CAPEC-8: Buffer Overflow in an API Call Buffer Overflow in an API Call CAPEC-9: Buffer Overflow in Local Command-Line Utilities Buffer Overflow in Local Command-Line Utilities CAPEC-10: Buffer Overflow via Environment Variables Buffer Overflow via Environment Variables CAPEC-14: Client-side Injection-induced Buffer Overflow Client-side Injection-induced Buffer Overflow CAPEC-24: Filter Failure through Buffer Overflow Filter Failure through Buffer Overflow CAPEC-42: MIME Conversion MIME Conversion CAPEC-44: Overflow Binary Resource File Overflow Binary Resource File CAPEC-45: Buffer Overflow via Symbolic Links Buffer Overflow via Symbolic Links CAPEC-46: Overflow Variables and Tags Overflow Variables and Tags CAPEC-47: Buffer Overflow via Parameter Expansion Buffer Overflow via Parameter Expansion CAPEC-67: String Format Overflow in syslog() String Format Overflow in syslog() CAPEC-92: Forced Integer Overflow Forced Integer Overflow CAPEC-100: Overflow Buffers Overflow Buffers

We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).

Results are limited to the first 15 repositories due to potential performance issues.

The following list is the news that have been mention CVE-2021-47040 vulnerability anywhere in the article.

Results are limited to the first 20 news articles due to potential performance issues.

The following table lists the changes that have been made to the CVE-2021-47040 vulnerability over time.

Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.

  • Initial Analysis by [email protected]

    Jan. 09, 2025

    Action Type Old Value New Value
    Added CVSS V3.1 NIST AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
    Added CWE NIST CWE-120
    Added CPE Configuration OR *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 5.8 up to (excluding) 5.10.37 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 5.11 up to (excluding) 5.11.21 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 5.12 up to (excluding) 5.12.4
    Changed Reference Type https://git.kernel.org/stable/c/38134ada0ceea3e848fe993263c0ff6207fd46e7 No Types Assigned https://git.kernel.org/stable/c/38134ada0ceea3e848fe993263c0ff6207fd46e7 Patch
    Changed Reference Type https://git.kernel.org/stable/c/38134ada0ceea3e848fe993263c0ff6207fd46e7 No Types Assigned https://git.kernel.org/stable/c/38134ada0ceea3e848fe993263c0ff6207fd46e7 Patch
    Changed Reference Type https://git.kernel.org/stable/c/51bf90901952aaac564bbdb36b2b503050c53dd9 No Types Assigned https://git.kernel.org/stable/c/51bf90901952aaac564bbdb36b2b503050c53dd9 Patch
    Changed Reference Type https://git.kernel.org/stable/c/51bf90901952aaac564bbdb36b2b503050c53dd9 No Types Assigned https://git.kernel.org/stable/c/51bf90901952aaac564bbdb36b2b503050c53dd9 Patch
    Changed Reference Type https://git.kernel.org/stable/c/84b8c266c4bfe9ed5128e13253c388deb74b1b03 No Types Assigned https://git.kernel.org/stable/c/84b8c266c4bfe9ed5128e13253c388deb74b1b03 Patch
    Changed Reference Type https://git.kernel.org/stable/c/84b8c266c4bfe9ed5128e13253c388deb74b1b03 No Types Assigned https://git.kernel.org/stable/c/84b8c266c4bfe9ed5128e13253c388deb74b1b03 Patch
    Changed Reference Type https://git.kernel.org/stable/c/cbbc13b115b8f18e0a714d89f87fbdc499acfe2d No Types Assigned https://git.kernel.org/stable/c/cbbc13b115b8f18e0a714d89f87fbdc499acfe2d Patch
    Changed Reference Type https://git.kernel.org/stable/c/cbbc13b115b8f18e0a714d89f87fbdc499acfe2d No Types Assigned https://git.kernel.org/stable/c/cbbc13b115b8f18e0a714d89f87fbdc499acfe2d Patch
  • CVE Modified by af854a3a-2127-422b-91ae-364da2661108

    Nov. 21, 2024

    Action Type Old Value New Value
    Added Reference https://git.kernel.org/stable/c/38134ada0ceea3e848fe993263c0ff6207fd46e7
    Added Reference https://git.kernel.org/stable/c/51bf90901952aaac564bbdb36b2b503050c53dd9
    Added Reference https://git.kernel.org/stable/c/84b8c266c4bfe9ed5128e13253c388deb74b1b03
    Added Reference https://git.kernel.org/stable/c/cbbc13b115b8f18e0a714d89f87fbdc499acfe2d
  • CVE Modified by 416baaa9-dc9f-4396-8d5f-8c081fb06d67

    May. 28, 2024

    Action Type Old Value New Value
  • CVE Modified by 416baaa9-dc9f-4396-8d5f-8c081fb06d67

    May. 14, 2024

    Action Type Old Value New Value
  • CVE Received by 416baaa9-dc9f-4396-8d5f-8c081fb06d67

    Feb. 28, 2024

    Action Type Old Value New Value
    Added Description In the Linux kernel, the following vulnerability has been resolved: io_uring: fix overflows checks in provide buffers Colin reported before possible overflow and sign extension problems in io_provide_buffers_prep(). As Linus pointed out previous attempt did nothing useful, see d81269fecb8ce ("io_uring: fix provide_buffers sign extension"). Do that with help of check_<op>_overflow helpers. And fix struct io_provide_buf::len type, as it doesn't make much sense to keep it signed.
    Added Reference Linux https://git.kernel.org/stable/c/cbbc13b115b8f18e0a714d89f87fbdc499acfe2d [No types assigned]
    Added Reference Linux https://git.kernel.org/stable/c/51bf90901952aaac564bbdb36b2b503050c53dd9 [No types assigned]
    Added Reference Linux https://git.kernel.org/stable/c/84b8c266c4bfe9ed5128e13253c388deb74b1b03 [No types assigned]
    Added Reference Linux https://git.kernel.org/stable/c/38134ada0ceea3e848fe993263c0ff6207fd46e7 [No types assigned]
EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days. Following chart shows the EPSS score history of the vulnerability.
Vulnerability Scoring Details
Base CVSS Score: 7.8
Attack Vector
Attack Complexity
Privileges Required
User Interaction
Scope
Confidentiality Impact
Integrity Impact
Availability Impact