CVE-2023-0266 Linux Kernel Use-After-Free
Exploited in the wild
High 7.9
Published
Updated
Check this codebase for CVE-2023-0266 and fix it if it is affected.
What it is: CVE-2023-0266 is a high-severity use after free vulnerability in Debian Debian Linux, published on 30 Jan 2023. It can only be exploited from the same machine or local network, with no action from the victim.
Exploitation: Yes. Attackers have exploited CVE-2023-0266 in the wild since at least 30 Mar 2023.
Affected product: Debian Debian Linux. 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-2023-0266/ (Markdown: https://insights.sbomify.com/CVE-2023-0266/index.md)
A use-after-free in the Linux Kernel ALSA PCM package allows local attackers to escalate privileges to ring0 access.
- Exploited in the wild
- Since 30 Mar 2023
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2023-0266?
CVE-2023-0266 is a high-severity use after free vulnerability in Debian Debian Linux, published on 30 Jan 2023. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
A use after free vulnerability exists in the ALSA PCM package in the Linux Kernel. SNDRV_CTL_IOCTL_ELEM_{READ|WRITE}32 is missing locks that can be used in a use-after-free that can result in a priviledge escalation to gain ring0 access from the system user. We recommend upgrading past commit 56b88b50565cd8b946a2d00b0c83927b7ebb055e
Weakness: CWE-416
Which versions are affected by CVE-2023-0266?
It affects 2 products.
Linux distribution packages (40)
bpftool Red Hat:rhel_e4s:8.1::baseos | All versions | 0:4.18.0-147.81.1.el8_1 |
bpftool-debuginfo Red Hat:rhel_e4s:8.1::baseos | All versions | 0:4.18.0-147.81.1.el8_1 |
kernel Red Hat:rhel_e4s:8.1::baseos | All versions | 0:4.18.0-147.81.1.el8_1 |
kernel-abi-whitelists Red Hat:rhel_e4s:8.1::baseos | All versions | 0:4.18.0-147.81.1.el8_1 |
kernel-core Red Hat:rhel_e4s:8.1::baseos | All versions | 0:4.18.0-147.81.1.el8_1 |
kernel-debug Red Hat:rhel_e4s:8.1::baseos | All versions | 0:4.18.0-147.81.1.el8_1 |
kernel-debug-core Red Hat:rhel_e4s:8.1::baseos | All versions | 0:4.18.0-147.81.1.el8_1 |
kernel-debug-debuginfo Red Hat:rhel_e4s:8.1::baseos | All versions | 0:4.18.0-147.81.1.el8_1 |
kernel-debug-devel Red Hat:rhel_e4s:8.1::baseos | All versions | 0:4.18.0-147.81.1.el8_1 |
kernel-debug-modules Red Hat:rhel_e4s:8.1::baseos | All versions | 0:4.18.0-147.81.1.el8_1 |
kernel-debug-modules-extra Red Hat:rhel_e4s:8.1::baseos | All versions | 0:4.18.0-147.81.1.el8_1 |
kernel-debuginfo Red Hat:rhel_e4s:8.1::baseos | All versions | 0:4.18.0-147.81.1.el8_1 |
kernel-debuginfo-common-ppc64le Red Hat:rhel_e4s:8.1::baseos | All versions | 0:4.18.0-147.81.1.el8_1 |
kernel-debuginfo-common-x86_64 Red Hat:rhel_e4s:8.1::baseos | All versions | 0:4.18.0-147.81.1.el8_1 |
kernel-devel Red Hat:rhel_e4s:8.1::baseos | All versions | 0:4.18.0-147.81.1.el8_1 |
kernel-doc Red Hat:rhel_e4s:8.1::baseos | All versions | 0:4.18.0-147.81.1.el8_1 |
kernel-modules Red Hat:rhel_e4s:8.1::baseos | All versions | 0:4.18.0-147.81.1.el8_1 |
kernel-modules-extra Red Hat:rhel_e4s:8.1::baseos | All versions | 0:4.18.0-147.81.1.el8_1 |
kernel-tools Red Hat:rhel_e4s:8.1::baseos | All versions | 0:4.18.0-147.81.1.el8_1 |
kernel-tools-debuginfo Red Hat:rhel_e4s:8.1::baseos | All versions | 0:4.18.0-147.81.1.el8_1 |
kernel-tools-libs Red Hat:rhel_e4s:8.1::baseos | All versions | 0:4.18.0-147.81.1.el8_1 |
kpatch-patch-4_18_0-147_74_1 Red Hat:rhel_e4s:8.1::baseos | All versions | 0:1-4.el8_1 |
kpatch-patch-4_18_0-147_74_1-debuginfo Red Hat:rhel_e4s:8.1::baseos | All versions | 0:1-4.el8_1 |
kpatch-patch-4_18_0-147_74_1-debugsource Red Hat:rhel_e4s:8.1::baseos | All versions | 0:1-4.el8_1 |
kpatch-patch-4_18_0-147_76_1 Red Hat:rhel_e4s:8.1::baseos | All versions | 0:1-3.el8_1 |
kpatch-patch-4_18_0-147_76_1-debuginfo Red Hat:rhel_e4s:8.1::baseos | All versions | 0:1-3.el8_1 |
kpatch-patch-4_18_0-147_76_1-debugsource Red Hat:rhel_e4s:8.1::baseos | All versions | 0:1-3.el8_1 |
kpatch-patch-4_18_0-147_77_1 Red Hat:rhel_e4s:8.1::baseos | All versions | 0:1-3.el8_1 |
kpatch-patch-4_18_0-147_77_1-debuginfo Red Hat:rhel_e4s:8.1::baseos | All versions | 0:1-3.el8_1 |
kpatch-patch-4_18_0-147_77_1-debugsource Red Hat:rhel_e4s:8.1::baseos | All versions | 0:1-3.el8_1 |
kpatch-patch-4_18_0-147_78_1 Red Hat:rhel_e4s:8.1::baseos | All versions | 0:1-2.el8_1 |
kpatch-patch-4_18_0-147_78_1-debuginfo Red Hat:rhel_e4s:8.1::baseos | All versions | 0:1-2.el8_1 |
kpatch-patch-4_18_0-147_78_1-debugsource Red Hat:rhel_e4s:8.1::baseos | All versions | 0:1-2.el8_1 |
kpatch-patch-4_18_0-147_80_1 Red Hat:rhel_e4s:8.1::baseos | All versions | 0:1-1.el8_1 |
kpatch-patch-4_18_0-147_80_1-debuginfo Red Hat:rhel_e4s:8.1::baseos | All versions | 0:1-1.el8_1 |
kpatch-patch-4_18_0-147_80_1-debugsource Red Hat:rhel_e4s:8.1::baseos | All versions | 0:1-1.el8_1 |
perf Red Hat:rhel_e4s:8.1::baseos | All versions | 0:4.18.0-147.81.1.el8_1 |
perf-debuginfo Red Hat:rhel_e4s:8.1::baseos | All versions | 0:4.18.0-147.81.1.el8_1 |
python3-perf Red Hat:rhel_e4s:8.1::baseos | All versions | 0:4.18.0-147.81.1.el8_1 |
python3-perf-debuginfo Red Hat:rhel_e4s:8.1::baseos | All versions | 0:4.18.0-147.81.1.el8_1 |
Products include Debian Debian Linux, Linux kernel.
How do I fix CVE-2023-0266?
Apply the vendor's patch. US federal agencies must fix it by 20 Apr 2023.
Upgrade to the fixed version. These bugs are found with fuzzing and sanitisers and avoided by memory-safe languages. More about Use after free.
Is CVE-2023-0266 being exploited?
Yes. Attackers have exploited CVE-2023-0266 in the wild since at least 30 Mar 2023.
Public exploit code: 1 proofs of concept on GitHub.
Other vulnerabilities in Debian Debian Linux
Sources
Also known as A-265303544, AZL-13190, AZL-13229, DEBIAN-CVE-2023-0266, GHSA-h8jm-3c82-6vvq, OESA-2023-1198 and 7 more.