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National Vulnerability Database

National Vulnerability Database

NVD

National Vulnerability Database
  1. Vulnerabilities

CVE-2021-3491 Detail

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).


Metrics

 
NVD enrichment efforts reference publicly available information to associate vector strings. CVSS information contributed by other sources is also displayed.
CVSS 4.0 Severity and Vector Strings:

NIST CVSS score
NIST: NVD
N/A
NVD assessment not yet provided.

References to Advisories, Solutions, and Tools

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Hyperlink Resource
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=d1f82808877bb10d3deee7cf3374a4eb3fb582db Patch  Vendor Advisory 
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://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-4949-1 Third Party Advisory 
https://ubuntu.com/security/notices/USN-4950-1 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.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 
https://www.zerodayinitiative.com/advisories/ZDI-21-589/ Third Party Advisory  VDB Entry 

Weakness Enumeration

CWE-ID CWE Name Source
CWE-787 Out-of-bounds Write cwe source acceptance level NIST  
CWE-131 Incorrect Calculation of Buffer Size Canonical Ltd.  

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Change History

5 change records found show changes

Quick Info

CVE Dictionary Entry:
CVE-2021-3491
NVD Published Date:
06/03/2021
NVD Last Modified:
11/21/2024
Source:
Canonical Ltd.