# CVE-2023-35788: Memory corruption in n/a > An out-of-bounds write in the Linux kernel flower classifier allows attackers to cause denial of service or escalate privileges via crafted GENEVE packets. - **Severity:** High 7.8 (`CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H`) - **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:** Yes - **Published:** 16 Jun 2023 - **Updated:** 18 Sep 2026 - **Also known as:** AZL-27197, DEBIAN-CVE-2023-35788, GHSA-7jpg-h873-5g68, RHSA-2023:4697, RHSA-2023:4698, RHSA-2023:4834, SUSE-SU-2023:3041-1, SUSE-SU-2023:3115-1, UBUNTU-CVE-2023-35788, USN-6193-1, USN-6205-1, USN-6212-1, USN-6234-1 ## What is CVE-2023-35788? CVE-2023-35788 is a high-severity memory corruption vulnerability in Canonical Ubuntu Linux, published on 16 Jun 2023. It can only be exploited from the same machine or local network, with no action from the victim. ### Official description An issue was discovered in fl_set_geneve_opt in net/sched/cls_flower.c in the Linux kernel before 6.3.7. It allows an out-of-bounds write in the flower classifier code via TCA_FLOWER_KEY_ENC_OPTS_GENEVE packets. This may result in denial of service or privilege escalation. Weakness: CWE-787 (Out-of-bounds Write) ## Which versions are affected by CVE-2023-35788? It affects 8 products. | Package | Ecosystem | Affected | Fixed in | | --- | --- | --- | --- | | `kpatch-patch-3_10_0-1160_83_1` | Red Hat:enterprise_linux:7::server | All versions | 0:1-3.el7 | | `kpatch-patch-3_10_0-1160_83_1-debuginfo` | Red Hat:enterprise_linux:7::server | All versions | 0:1-3.el7 | | `kpatch-patch-3_10_0-1160_88_1` | Red Hat:enterprise_linux:7::server | All versions | 0:1-2.el7 | | `kpatch-patch-3_10_0-1160_88_1-debuginfo` | Red Hat:enterprise_linux:7::server | All versions | 0:1-2.el7 | | `kpatch-patch-3_10_0-1160_90_1` | Red Hat:enterprise_linux:7::server | All versions | 0:1-2.el7 | | `kpatch-patch-3_10_0-1160_90_1-debuginfo` | Red Hat:enterprise_linux:7::server | All versions | 0:1-2.el7 | | `kpatch-patch-3_10_0-1160_92_1` | Red Hat:enterprise_linux:7::server | All versions | 0:1-2.el7 | | `kpatch-patch-3_10_0-1160_92_1-debuginfo` | Red Hat:enterprise_linux:7::server | All versions | 0:1-2.el7 | | `kpatch-patch-3_10_0-1160_95_1` | Red Hat:enterprise_linux:7::server | All versions | 0:1-1.el7 | | `kpatch-patch-3_10_0-1160_95_1-debuginfo` | Red Hat:enterprise_linux:7::server | All versions | 0:1-1.el7 | | `bpftool` | Red Hat:rhel_aus:7.7::server | All versions | 0:3.10.0-1062.77.1.el7 | | `bpftool-debuginfo` | Red Hat:rhel_aus:7.7::server | All versions | 0:3.10.0-1062.77.1.el7 | | `kernel` | Red Hat:rhel_aus:7.7::server | All versions | 0:3.10.0-1062.77.1.el7 | | `kernel-abi-whitelists` | Red Hat:rhel_aus:7.7::server | All versions | 0:3.10.0-1062.77.1.el7 | | `kernel-debug` | Red Hat:rhel_aus:7.7::server | All versions | 0:3.10.0-1062.77.1.el7 | | `kernel-debug-debuginfo` | Red Hat:rhel_aus:7.7::server | All versions | 0:3.10.0-1062.77.1.el7 | | `kernel-debug-devel` | Red Hat:rhel_aus:7.7::server | All versions | 0:3.10.0-1062.77.1.el7 | | `kernel-debuginfo` | Red Hat:rhel_aus:7.7::server | All versions | 0:3.10.0-1062.77.1.el7 | | `kernel-debuginfo-common-x86_64` | Red Hat:rhel_aus:7.7::server | All versions | 0:3.10.0-1062.77.1.el7 | | `kernel-devel` | Red Hat:rhel_aus:7.7::server | All versions | 0:3.10.0-1062.77.1.el7 | | `kernel-doc` | Red Hat:rhel_aus:7.7::server | All versions | 0:3.10.0-1062.77.1.el7 | | `kernel-tools` | Red Hat:rhel_aus:7.7::server | All versions | 0:3.10.0-1062.77.1.el7 | | `kernel-tools-debuginfo` | Red Hat:rhel_aus:7.7::server | All versions | 0:3.10.0-1062.77.1.el7 | | `kernel-tools-libs` | Red Hat:rhel_aus:7.7::server | All versions | 0:3.10.0-1062.77.1.el7 | | `kernel-tools-libs-devel` | Red Hat:rhel_aus:7.7::server | All versions | 0:3.10.0-1062.77.1.el7 | | `perf` | Red Hat:rhel_aus:7.7::server | All versions | 0:3.10.0-1062.77.1.el7 | | `perf-debuginfo` | Red Hat:rhel_aus:7.7::server | All versions | 0:3.10.0-1062.77.1.el7 | | `python-perf` | Red Hat:rhel_aus:7.7::server | All versions | 0:3.10.0-1062.77.1.el7 | | `python-perf-debuginfo` | Red Hat:rhel_aus:7.7::server | All versions | 0:3.10.0-1062.77.1.el7 | | `bpftool` | Red Hat:rhel_e4s:7.7::server | All versions | 0:3.10.0-1062.77.1.el7 | | `bpftool-debuginfo` | Red Hat:rhel_e4s:7.7::server | All versions | 0:3.10.0-1062.77.1.el7 | | `kernel` | Red Hat:rhel_e4s:7.7::server | All versions | 0:3.10.0-1062.77.1.el7 | | `kernel-abi-whitelists` | Red Hat:rhel_e4s:7.7::server | All versions | 0:3.10.0-1062.77.1.el7 | | `kernel-bootwrapper` | Red Hat:rhel_e4s:7.7::server | All versions | 0:3.10.0-1062.77.1.el7 | | `kernel-debug` | Red Hat:rhel_e4s:7.7::server | All versions | 0:3.10.0-1062.77.1.el7 | | `kernel-debug-debuginfo` | Red Hat:rhel_e4s:7.7::server | All versions | 0:3.10.0-1062.77.1.el7 | | `kernel-debug-devel` | Red Hat:rhel_e4s:7.7::server | All versions | 0:3.10.0-1062.77.1.el7 | | `kernel-debuginfo` | Red Hat:rhel_e4s:7.7::server | All versions | 0:3.10.0-1062.77.1.el7 | | `kernel-debuginfo-common-ppc64le` | Red Hat:rhel_e4s:7.7::server | All versions | 0:3.10.0-1062.77.1.el7 | | `kernel-debuginfo-common-x86_64` | Red Hat:rhel_e4s:7.7::server | All versions | 0:3.10.0-1062.77.1.el7 | Products: Canonical Ubuntu Linux, Debian Debian Linux, Linux kernel, Netapp H300s Firmware, Netapp H410c Firmware, Netapp H410s Firmware, Netapp H500s Firmware, Netapp H700s Firmware. ## How do I fix CVE-2023-35788? Apply the vendor's patch. ## Is CVE-2023-35788 being exploited? It is not confirmed as exploited in the wild, but public exploit code for CVE-2023-35788 exists. Public exploit code: - https://github.com/lanleft/cve-2023-35788 (github_poc): https://github.com/lanleft/cve-2023-35788 ## Other vulnerabilities in Canonical Ubuntu Linux - [CVE-2020-11651](https://insights.sbomify.com/CVE-2020-11651/): SaltStack Salt Authentication Bypass (critical 9.8, exploited in the wild) - [CVE-2020-7247](https://insights.sbomify.com/CVE-2020-7247/): OpenSMTPD Remote Code Execution (critical 9.8, exploited in the wild) - [CVE-2019-16928](https://insights.sbomify.com/CVE-2019-16928/): Exim Out-of-bounds Write (critical 9.8, exploited in the wild) - [CVE-2018-6789](https://insights.sbomify.com/CVE-2018-6789/): Exim Buffer Overflow (critical 9.8, exploited in the wild) - [CVE-2015-2590](https://insights.sbomify.com/CVE-2015-2590/): Oracle Java SE and Java SE Embedded Remote Code Execution (critical 9.8, exploited in the wild) ## Fix prompt for AI coding agents ```text Check this codebase for CVE-2023-35788 and fix it if it is affected. What it is: CVE-2023-35788 is a high-severity memory corruption vulnerability in Canonical Ubuntu Linux, published on 16 Jun 2023. It can only be exploited from the same machine or local network, with no action from the victim. Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2023-35788 exists. Affected product: Canonical Ubuntu 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-2023-35788/ (Markdown: https://insights.sbomify.com/CVE-2023-35788/index.md) ``` ## Sources - CVE record: https://www.cve.org/CVERecord?id=CVE-2023-35788 - NVD: https://nvd.nist.gov/vuln/detail/CVE-2023-35788 - OSV: https://osv.dev/vulnerability/CVE-2023-35788 --- From sbomify Insights: https://insights.sbomify.com/CVE-2023-35788/ Summaries are generated and may contain mistakes; the official description above is the record.