CVE-2021-3491
Linux io_uring Heap Overflow Arbitrary Code Execution
Description
The io_uring subsystem in the Linux kernel allowed the MAX_RW_COUNT limit to be bypassed in the PROVIDE_BUFFERS operation, which led to negative values being usedin mem_rw when reading /proc/<PID>/mem. This could be used to create a heap overflow leading to arbitrary code execution in the kernel. It was addressed via commit d1f82808877b ("io_uring: truncate lengths larger than MAX_RW_COUNT on provide buffers") (v5.13-rc1) and backported to the stable kernels in v5.12.4, v5.11.21, and v5.10.37. It was introduced in ddf0322db79c ("io_uring: add IORING_OP_PROVIDE_BUFFERS") (v5.7-rc1).
INFO
Published Date :
June 4, 2021, 2:15 a.m.
Last Modified :
Sept. 14, 2021, 2:31 p.m.
Source :
[email protected]
Remotely Exploitable :
No
Impact Score :
6.0
Exploitability Score :
2.0
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-2021-3491.
| URL | Resource |
|---|---|
| https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=d1f82808877bb10d3deee7cf3374a4eb3fb582db | Patch Vendor Advisory |
| https://security.netapp.com/advisory/ntap-20210716-0004/ | Third Party Advisory |
| https://ubuntu.com/security/notices/USN-4949-1 | Third Party Advisory |
| https://ubuntu.com/security/notices/USN-4950-1 | Third Party Advisory |
| https://www.openwall.com/lists/oss-security/2021/05/11/13 | Mailing List Patch Third Party Advisory |
| https://www.zerodayinitiative.com/advisories/ZDI-21-589/ | Third Party Advisory VDB Entry |
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-2021-3491 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2021-3491 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.
-
CVE Modified by [email protected]
May. 14, 2024
Action Type Old Value New Value -
Modified Analysis by [email protected]
Sep. 14, 2021
Action Type Old Value New Value Changed Reference Type https://security.netapp.com/advisory/ntap-20210716-0004/ No Types Assigned https://security.netapp.com/advisory/ntap-20210716-0004/ Third Party Advisory -
CVE Modified by [email protected]
Jul. 16, 2021
Action Type Old Value New Value Added Reference https://security.netapp.com/advisory/ntap-20210716-0004/ [No Types Assigned] -
Initial Analysis by [email protected]
Jun. 11, 2021
Action Type Old Value New Value Added CVSS V2 NIST (AV:L/AC:L/Au:N/C:C/I:C/A:C) Added CVSS V3.1 NIST AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H Changed Reference Type https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=d1f82808877bb10d3deee7cf3374a4eb3fb582db No Types Assigned https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=d1f82808877bb10d3deee7cf3374a4eb3fb582db Patch, Vendor Advisory Changed Reference Type https://ubuntu.com/security/notices/USN-4949-1 No Types Assigned https://ubuntu.com/security/notices/USN-4949-1 Third Party Advisory Changed Reference Type https://ubuntu.com/security/notices/USN-4950-1 No Types Assigned https://ubuntu.com/security/notices/USN-4950-1 Third Party Advisory Changed Reference Type https://www.openwall.com/lists/oss-security/2021/05/11/13 No Types Assigned https://www.openwall.com/lists/oss-security/2021/05/11/13 Mailing List, Patch, Third Party Advisory Changed Reference Type https://www.zerodayinitiative.com/advisories/ZDI-21-589/ No Types Assigned https://www.zerodayinitiative.com/advisories/ZDI-21-589/ Third Party Advisory, VDB Entry Added CWE NIST CWE-787 Added CPE Configuration OR *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 5.7 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 Added CPE Configuration OR *cpe:2.3:o:canonical:ubuntu_linux:20.04:*:*:*:lts:*:*:* *cpe:2.3:o:canonical:ubuntu_linux:20.10:*:*:*:*:*:*:* *cpe:2.3:o:canonical:ubuntu_linux:21.04:*:*:*:*:*:*:*
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2021-3491 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-2021-3491
weaknesses.
Exploit Prediction
EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days.
0.05 }} 0.00%
score
0.19470
percentile