CVE-2021-4155
MEDIUMCVSS 5.5/10EPSS 0.29%
Last modified
CVE-2021-4155 is a medium-severity vulnerability rated 5.5/10 on the CVSS scale. A data leak flaw was found in the way XFS_IOC_ALLOCSP IOCTL in the XFS filesystem allowed for size increase of files with unaligned size. A local attacker could use this flaw to leak data on the XFS filesystem otherwise not accessible to them.. EPSS estimates a 0.29% chance of exploitation in the next 30 days.
Description
A data leak flaw was found in the way XFS_IOC_ALLOCSP IOCTL in the XFS filesystem allowed for size increase of files with unaligned size. A local attacker could use this flaw to leak data on the XFS filesystem otherwise not accessible to them.
Metrics
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Linux | Linux Kernel | < 5.16 |
References
- https://access.redhat.com/security/cve/CVE-2021-4155Mitigation, Third Party Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=2034813Issue Tracking, Third Party Advisory
- https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=983d8e60f50806f90534cc5373d0ce867e5aaf79Mailing List, Patch, Vendor Advisory
- https://security-tracker.debian.org/tracker/CVE-2021-4155Third Party Advisory
- https://www.openwall.com/lists/oss-security/2022/01/10/1Mailing List, Patch, Third Party Advisory
- https://access.redhat.com/security/cve/CVE-2021-4155Mitigation, Third Party Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=2034813Issue Tracking, Third Party Advisory
- https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=983d8e60f50806f90534cc5373d0ce867e5aaf79Mailing List, Patch, Vendor Advisory
- https://security-tracker.debian.org/tracker/CVE-2021-4155Third Party Advisory
- https://www.openwall.com/lists/oss-security/2022/01/10/1Mailing List, Patch, Third Party Advisory
Timeline
- Published
- Last Modified
- Status
- Modified
Frequently Asked Questions
What is CVE-2021-4155?
A data leak flaw was found in the way XFS_IOC_ALLOCSP IOCTL in the XFS filesystem allowed for size increase of files with unaligned size. A local attacker could use this flaw to leak data on the XFS filesystem otherwise not accessible to them.
How severe is CVE-2021-4155?
CVE-2021-4155 has a CVSS score of 5.5/10 (MEDIUM severity). The EPSS model estimates a 0.29% probability of exploitation in the next 30 days.
How do I fix CVE-2021-4155?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.
How Strix Helps
- How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
- Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
- PR ReviewsPentest every pull request so vulnerable code is caught before it ships to production.
- AI Penetration TestingHow AI-driven penetration testing continuously covers your attack surface.
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Are you affected by CVE-2021-4155?
Run a free Strix scan to check your systems for this vulnerability.
Scan your code nowSource: NVD / NIST