{"answers":{"affected":"It affects 2 products.","exploited":"There is no known exploitation of CVE-2023-3640 in the wild and no public exploit code.","fix":"Apply the vendor's patch.","what":"CVE-2023-3640 is a high-severity vulnerability in Linux kernel, published on 24 Jul 2023. It can only be exploited from the same machine or local network, with no action from the victim."},"fix_prompt":"Check this codebase for CVE-2023-3640 and fix it if it is affected.\n\nWhat it is: CVE-2023-3640 is a high-severity vulnerability in Linux kernel, published on 24 Jul 2023. It can only be exploited from the same machine or local network, with no action from the victim.\nExploitation: There is no known exploitation of CVE-2023-3640 in the wild and no public exploit code.\n\nAffected product: Linux kernel. No package-level version data is available, so check the vendor advisory linked from the reference page.\n\nTask:\n1. 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.\n2. 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.\n3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.\n4. Run the tests and summarise what changed and why.\n5. If nothing in the project is affected, say so and change nothing.\n\nReference: https://insights.sbomify.com/CVE-2023-3640/ (Markdown: https://insights.sbomify.com/CVE-2023-3640/index.md)","id":"CVE-2023-3640","markdown":"https://insights.sbomify.com/CVE-2023-3640/index.md","name":"CVE-2023-3640","record":{"aliases":["DEBIAN-CVE-2023-3640","GHSA-g854-mv2r-2r5h","ROOT-OS-DEBIAN-11-CVE-2023-3640","ROOT-OS-DEBIAN-12-CVE-2023-3640","ROOT-OS-DEBIAN-13-CVE-2023-3640","ROOT-OS-UBUNTU-2204-CVE-2023-3640","UBUNTU-CVE-2023-3640"],"analysis":{"component_type":"kernel","fix_type":"patch","impacts":["data_read","privilege_escalation"],"network_reachable":"adjacent_or_local","non_default_config":false,"product_category":"Linux kernel","requires_auth":"low_privilege","summary":"A local attacker can leak per-cpu entry area addresses to bypass KASLR, potentially leading to privilege escalation.","user_interaction":"not_required","vuln_class":"information_disclosure"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"redhat","cpe":[{"product":"linux_kernel","vendor":"linux"},{"product":"enterprise_linux","vendor":"redhat"}],"cvss":{"score":7,"severity":"high","source":"cna","vector":"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H","version":"3.1"},"cwes":[{"id":"CWE-203","name":"Observable Discrepancy"},{"id":"CWE-385","name":"Covert Timing Channel"}],"description":"A possible unauthorized memory access flaw was found in the Linux kernel's cpu_entry_area mapping of X86 CPU data to memory, where a user may guess the location of exception stacks or other important data. Based on the previous CVE-2023-0597, the 'Randomize per-cpu entry area' feature was implemented in /arch/x86/mm/cpu_entry_area.c, which works through the init_cea_offsets() function when KASLR is enabled. However, despite this feature, there is still a risk of per-cpu entry area leaks. This issue could allow a local user to gain access to some important data with memory in an expected location and potentially escalate their privileges on the system.","ecosystems":[],"exploits":{"exploitdb":0,"first_seen":"2023-06-20","github_poc":1,"max_poc_stars":29,"metasploit":0,"nuclei":0,"refs":[{"date":"2023-06-20T06:21:04Z","kind":"github_poc","ref":"https://github.com/pray77/CVE-2023-3640","stars":29,"title":"SCTF 2023 kernel pwn \u0026\u0026 CVE-2023-3640"}],"tier":"poc_unverified"},"has_fix":true,"headline":"Information disclosure in Red Hat Enterprise Linux 6","id":"CVE-2023-3640","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":null,"product":"linux:linux_kernel","products":["linux:linux_kernel","redhat:enterprise_linux"],"type":"information_disclosure","year":"2023"},"n_packages":0,"n_references":3,"next":{"headline":"khodakhah NodCMS POST Request blog-comment-4 cross site scripting","id":"CVE-2023-3641"},"packages":[],"prev":{"headline":"GeoVision GV-ADR2701 Improper Authentication","id":"CVE-2023-3638"},"products":["Red Hat Enterprise Linux 6","Red Hat Enterprise Linux 7","Red Hat Enterprise Linux 8","Red Hat Enterprise Linux 9"],"published":"2023-07-24","related":[{"cvss_score":8.8,"headline":"Linux Kernel Out-of-Bounds Write","id":"CVE-2026-53266","kev_date_added":"2026-09-18","published":"2026-06-25"},{"cvss_score":8.8,"headline":"Linux Kernel Improper Input Validation","id":"CVE-2013-6282","kev_date_added":"2022-09-15","published":"2013-11-19"},{"cvss_score":8.4,"headline":"Linux Kernel Heap-Based Buffer Overflow","id":"CVE-2022-0185","kev_date_added":"2024-08-21","published":"2022-02-11"},{"cvss_score":8.4,"headline":"Linux Kernel Privilege Escalation","id":"CVE-2013-2094","kev_date_added":"2022-09-15","published":"2013-05-14"},{"cvss_score":7.8,"headline":"Linux Kernel Unspecified","id":"CVE-2026-53362","kev_date_added":"2026-08-27","published":"2026-07-04"},{"cvss_score":7.8,"headline":"Linux Kernel Missing Initialization of a Variable","id":"CVE-2026-46300","kev_date_added":"2026-10-28","published":"2026-05-23"},{"cvss_score":7.8,"headline":"Linux Kernel Race Condition","id":"CVE-2025-39964","kev_date_added":"2026-09-18","published":"2025-10-13"}],"sources":[{"class":"attribution","licence":"CVE Terms of Use (MITRE)","name":"CVE List","prefix":"CVE"},{"class":"attribution","licence":"US public information, NVD API terms","name":"NVD"},{"class":"attribution","licence":"CWE Terms of Use","name":"CWE (MITRE)"},{"class":"attribution","licence":"FIRST CVSS licence","name":"CVSS (FIRST)"},{"class":"open","licence":"CC0","name":"PoC-in-GitHub"}],"ssvc":{"automatable":"no","exploitation":"none","technical_impact":"total"},"state":"PUBLISHED","updated":"2026-07-21","vendors":["Red Hat"]},"summary":"A local attacker can leak per-cpu entry area addresses to bypass KASLR, potentially leading to privilege escalation.","url":"https://insights.sbomify.com/CVE-2023-3640/"}