CVE-2021-3491: (Pwn2Own) Canonical Ubuntu io_uring Integer Overflow Privilege Escalation Vulnerability
First published: Tue May 11 2021(Updated: )
Last updated 24 July 2024
Credit: security@ubuntu.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Linux kernel | >=5.7<5.10.37 | |
| Linux kernel | >=5.11<5.11.21 | |
| Linux kernel | >=5.12<5.12.4 | |
| Ubuntu Linux | =20.04 | |
| Ubuntu Linux | =20.10 | |
| Ubuntu Linux | =21.04 | |
| Ubuntu Unattended Upgrades | ||
| debian/linux | 5.10.223-1 5.10.234-1 6.1.129-1 6.1.128-1 6.12.21-1 6.12.22-1 |
Never miss a vulnerability like this again
Sign up to SecAlerts for real-time vulnerability data matched to your software, aggregated from hundreds of sources.
Reference Links
- https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=d1f82808877bb10d3deee7cf3374a4eb3fb582db
- https://security.netapp.com/advisory/ntap-20210716-0004/
- https://ubuntu.com/security/notices/USN-4949-1
- https://ubuntu.com/security/notices/USN-4950-1
- https://www.openwall.com/lists/oss-security/2021/05/11/13
- https://www.zerodayinitiative.com/advisories/ZDI-21-589/
- https://launchpad.net/bugs/cve/CVE-2021-3491
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-3491
- https://nvd.nist.gov/vuln/detail/CVE-2021-3491
- https://security-tracker.debian.org/tracker/CVE-2021-3491
- https://ubuntu.com/security/CVE-2021-3491
- https://git.kernel.org/linus/d1f82808877bb10d3deee7cf3374a4eb3fb582db
Frequently Asked Questions
What is the severity of CVE-2021-3491?
CVE-2021-3491 is considered a high severity vulnerability due to the potential for heap overflow.
How do I fix CVE-2021-3491?
To fix CVE-2021-3491, upgrade to the patched kernel versions such as 5.10.223-1 or higher.
What systems are affected by CVE-2021-3491?
CVE-2021-3491 affects multiple versions of the Linux kernel, particularly those between 5.7 and 5.12.4.
Can CVE-2021-3491 be exploited remotely?
CVE-2021-3491 may allow local users to exploit the vulnerability, but is not classified as a remote exploitation vulnerability.
What are the potential impacts of CVE-2021-3491?
Exploiting CVE-2021-3491 could lead to unauthorized access to memory and potentially allow attackers to execute arbitrary code.
- agent/type
- agent/first-publish-date
- collector/launchpad-cve
- source/Launchpad
- agent/title
- agent/weakness
- collector/mitre-cve
- source/MITRE
- agent/severity
- collector/usn-cve
- source/Ubuntu
- agent/remedy
- agent/references
- agent/description
- agent/last-modified-date
- agent/trending
- agent/source
- agent/author
- collector/nvd-cve
- source/NVD
- agent/software-canonical-lookup
- agent/software-canonical-lookup-request
- collector/nvd-index
- collector/zdi-advisory
- source/ZDI
- alias/ZDI-21-589
- alias/ZDI-CAN-13546
- alias/CVE-2021-3491
- agent/tags
- agent/event
- agent/softwarecombine
- collector/security-tracker-debian
- source/Debian
- vendor/linux
- canonical/linux kernel
- version/linux kernel/5.7
- version/linux kernel/5.11
- version/linux kernel/5.12
- vendor/canonical
- canonical/ubuntu linux
- version/ubuntu linux/20.04
- version/ubuntu linux/20.10
- version/ubuntu linux/21.04
- canonical/ubuntu unattended upgrades
- package-manager/debian