CVE-2021-4155 Information disclosure in kernel
Medium 5.5
Published
Updated
Check this codebase for CVE-2021-4155 and fix it if it is affected.
What it is: CVE-2021-4155 is a medium-severity vulnerability in Linux kernel, published on 24 Aug 2022. It can only be exploited from the same machine or local network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2021-4155 in the wild and no public exploit code.
Affected product: Linux kernel. No package-level version data is available, so check the vendor advisory linked from the reference page.
Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.
Reference: https://insights.sbomify.com/CVE-2021-4155/ (Markdown: https://insights.sbomify.com/CVE-2021-4155/index.md)
A local attacker can exploit an XFS filesystem flaw to leak inaccessible data from files with unaligned sizes.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2021-4155?
CVE-2021-4155 is a medium-severity vulnerability in Linux kernel, published on 24 Aug 2022. It can only be exploited from the same machine or local network, with no action from the victim.
Official 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.
Weakness: CWE-131
Which versions are affected by CVE-2021-4155?
It affects 1 product.
Linux distribution packages (40)
kernel Red Hat:rhel_aus:7.4::server | All versions | 0:3.10.0-693.96.1.el7 |
kernel-abi-whitelists Red Hat:rhel_aus:7.4::server | All versions | 0:3.10.0-693.96.1.el7 |
kernel-debug Red Hat:rhel_aus:7.4::server | All versions | 0:3.10.0-693.96.1.el7 |
kernel-debug-debuginfo Red Hat:rhel_aus:7.4::server | All versions | 0:3.10.0-693.96.1.el7 |
kernel-debug-devel Red Hat:rhel_aus:7.4::server | All versions | 0:3.10.0-693.96.1.el7 |
kernel-debuginfo Red Hat:rhel_aus:7.4::server | All versions | 0:3.10.0-693.96.1.el7 |
kernel-debuginfo-common-x86_64 Red Hat:rhel_aus:7.4::server | All versions | 0:3.10.0-693.96.1.el7 |
kernel-devel Red Hat:rhel_aus:7.4::server | All versions | 0:3.10.0-693.96.1.el7 |
kernel-doc Red Hat:rhel_aus:7.4::server | All versions | 0:3.10.0-693.96.1.el7 |
kernel-tools Red Hat:rhel_aus:7.4::server | All versions | 0:3.10.0-693.96.1.el7 |
kernel-tools-debuginfo Red Hat:rhel_aus:7.4::server | All versions | 0:3.10.0-693.96.1.el7 |
kernel-tools-libs Red Hat:rhel_aus:7.4::server | All versions | 0:3.10.0-693.96.1.el7 |
kernel-tools-libs-devel Red Hat:rhel_aus:7.4::server | All versions | 0:3.10.0-693.96.1.el7 |
perf Red Hat:rhel_aus:7.4::server | All versions | 0:3.10.0-693.96.1.el7 |
perf-debuginfo Red Hat:rhel_aus:7.4::server | All versions | 0:3.10.0-693.96.1.el7 |
python-perf Red Hat:rhel_aus:7.4::server | All versions | 0:3.10.0-693.96.1.el7 |
python-perf-debuginfo Red Hat:rhel_aus:7.4::server | All versions | 0:3.10.0-693.96.1.el7 |
bpftool Red Hat:rhel_e4s:8.1::baseos | All versions | 0:4.18.0-147.59.1.el8_1 |
bpftool-debuginfo Red Hat:rhel_e4s:8.1::baseos | All versions | 0:4.18.0-147.59.1.el8_1 |
kernel Red Hat:rhel_e4s:8.1::baseos | All versions | 0:4.18.0-147.59.1.el8_1 |
kernel-abi-whitelists Red Hat:rhel_e4s:8.1::baseos | All versions | 0:4.18.0-147.59.1.el8_1 |
kernel-core Red Hat:rhel_e4s:8.1::baseos | All versions | 0:4.18.0-147.59.1.el8_1 |
kernel-debug Red Hat:rhel_e4s:8.1::baseos | All versions | 0:4.18.0-147.59.1.el8_1 |
kernel-debug-core Red Hat:rhel_e4s:8.1::baseos | All versions | 0:4.18.0-147.59.1.el8_1 |
kernel-debug-debuginfo Red Hat:rhel_e4s:8.1::baseos | All versions | 0:4.18.0-147.59.1.el8_1 |
kernel-debug-devel Red Hat:rhel_e4s:8.1::baseos | All versions | 0:4.18.0-147.59.1.el8_1 |
kernel-debug-modules Red Hat:rhel_e4s:8.1::baseos | All versions | 0:4.18.0-147.59.1.el8_1 |
kernel-debug-modules-extra Red Hat:rhel_e4s:8.1::baseos | All versions | 0:4.18.0-147.59.1.el8_1 |
kernel-debuginfo Red Hat:rhel_e4s:8.1::baseos | All versions | 0:4.18.0-147.59.1.el8_1 |
kernel-debuginfo-common-ppc64le Red Hat:rhel_e4s:8.1::baseos | All versions | 0:4.18.0-147.59.1.el8_1 |
kernel-debuginfo-common-x86_64 Red Hat:rhel_e4s:8.1::baseos | All versions | 0:4.18.0-147.59.1.el8_1 |
kernel-devel Red Hat:rhel_e4s:8.1::baseos | All versions | 0:4.18.0-147.59.1.el8_1 |
kernel-doc Red Hat:rhel_e4s:8.1::baseos | All versions | 0:4.18.0-147.59.1.el8_1 |
kernel-modules Red Hat:rhel_e4s:8.1::baseos | All versions | 0:4.18.0-147.59.1.el8_1 |
kernel-modules-extra Red Hat:rhel_e4s:8.1::baseos | All versions | 0:4.18.0-147.59.1.el8_1 |
kernel-tools Red Hat:rhel_e4s:8.1::baseos | All versions | 0:4.18.0-147.59.1.el8_1 |
kernel-tools-debuginfo Red Hat:rhel_e4s:8.1::baseos | All versions | 0:4.18.0-147.59.1.el8_1 |
kernel-tools-libs Red Hat:rhel_e4s:8.1::baseos | All versions | 0:4.18.0-147.59.1.el8_1 |
kpatch-patch-4_18_0-147_43_1 Red Hat:rhel_e4s:8.1::baseos | All versions | 0:1-10.el8_1 |
kpatch-patch-4_18_0-147_43_1-debuginfo Red Hat:rhel_e4s:8.1::baseos | All versions | 0:1-10.el8_1 |
Products include Linux kernel.
How do I fix CVE-2021-4155?
Apply the vendor's patch.
Is CVE-2021-4155 being exploited?
There is no known exploitation of CVE-2021-4155 in the wild and no public exploit code.
Other vulnerabilities in Linux kernel
Sources
Also known as AZL-10677, DEBIAN-CVE-2021-4155, RHSA-2022:0335, RHSA-2022:0344, RHSA-2022:0530, UBUNTU-CVE-2021-4155.