{"answers":{"affected":"It affects 1 product.","exploited":"There is no known exploitation of CVE-2026-64390 in the wild and no public exploit code.","fix":"Apply the vendor's patch.","what":"CVE-2026-64390 is a high-severity use after free vulnerability in Linux kernel, published on 25 Jul 2026. Any signed-in user can exploit it over the network, with no action from the victim."},"fix_prompt":"Check this codebase for CVE-2026-64390 and fix it if it is affected.\n\nWhat it is: CVE-2026-64390 is a high-severity use after free vulnerability in Linux kernel, published on 25 Jul 2026. Any signed-in user can exploit it over the network, with no action from the victim.\nExploitation: There is no known exploitation of CVE-2026-64390 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-2026-64390/ (Markdown: https://insights.sbomify.com/CVE-2026-64390/index.md)","id":"CVE-2026-64390","markdown":"https://insights.sbomify.com/CVE-2026-64390/index.md","name":"CVE-2026-64390","record":{"aliases":["BELL-CVE-2026-64390","DEBIAN-CVE-2026-64390","GHSA-pgh2-g34p-4j6m","ROOT-OS-DEBIAN-12-CVE-2026-64390","ROOT-OS-DEBIAN-13-CVE-2026-64390","ROOT-OS-UBUNTU-2204-CVE-2026-64390","UBUNTU-CVE-2026-64390"],"analysis":{"component_type":"kernel","fix_type":"patch","impacts":["code_execution","denial_of_service"],"network_reachable":"yes","non_default_config":false,"product_category":"Linux kernel ksmbd","requires_auth":"low_privilege","summary":"A use-after-free vulnerability in the Linux kernel's ksmbd module allows attackers to execute arbitrary code or cause a denial of service via SMB multichannel operations.","user_interaction":"not_required","vuln_class":"use_after_free"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"Linux","cpe":[{"product":"linux_kernel","vendor":"linux"}],"cvss":{"score":8.8,"severity":"high","source":"cna","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","version":"3.1"},"cwes":[],"description":"In the Linux kernel, the following vulnerability has been resolved:\n\nksmbd: track the connection owning a byte-range lock\n\nSMB2_LOCK adds each granted byte-range lock to both the file lock list\nand the lock list of the connection which handled the request.  The\nfinal close and durable handle paths, however, remove the connection\nlist entry while holding fp-\u003econn-\u003ellist_lock.\n\nWith SMB3 multichannel, the connection handling the LOCK request can be\ndifferent from the connection which opened the file.  The entry can\ntherefore be removed under a different spinlock from the one protecting\nthe list it belongs to.  A concurrent traversal can then access freed\nstruct ksmbd_lock and struct file_lock objects.\n\nRecord the connection owning each lock's clist entry and hold a\nreference to it while the entry is linked.  Use that connection and its\nllist_lock for unlock, rollback, close, and durable preserve.  Durable\nreconnect assigns the new connection as the owner when publishing the\nlocks again.","ecosystems":[],"exploits":{"exploitdb":0,"first_seen":null,"github_poc":0,"max_poc_stars":null,"metasploit":0,"nuclei":0,"refs":[],"tier":"none_known"},"has_fix":true,"headline":"ksmbd: track the connection owning a byte-range lock","id":"CVE-2026-64390","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":null,"product":"linux:linux_kernel","products":["linux:linux_kernel"],"type":"use_after_free","year":"2026"},"n_packages":0,"n_references":7,"next":{"headline":"ksmbd: use opener credentials for ADS I/O","id":"CVE-2026-64391"},"packages":[],"prev":{"headline":"ksmbd: validate NTLMv2 response before updating session key","id":"CVE-2026-64389"},"products":["Linux"],"published":"2026-07-25","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":"FIRST CVSS licence","name":"CVSS (FIRST)"}],"ssvc":{"automatable":null,"exploitation":null,"technical_impact":null},"state":"PUBLISHED","updated":"2026-08-17","vendors":["Linux"]},"summary":"A use-after-free vulnerability in the Linux kernel's ksmbd module allows attackers to execute arbitrary code or cause a denial of service via SMB multichannel operations.","url":"https://insights.sbomify.com/CVE-2026-64390/"}