{"answers":{"affected":"It affects 2 products.","exploited":"There is no known exploitation of CVE-2025-38527 in the wild and no public exploit code.","fix":"Apply the vendor's patch.","what":"CVE-2025-38527 is a critical use after free vulnerability in Debian Debian Linux, published on 16 Aug 2025. An attacker can exploit it over the internet without logging in, with no action from the victim."},"fix_prompt":"Check this codebase for CVE-2025-38527 and fix it if it is affected.\n\nWhat it is: CVE-2025-38527 is a critical use after free vulnerability in Debian Debian Linux, published on 16 Aug 2025. An attacker can exploit it over the internet without logging in, with no action from the victim.\nExploitation: There is no known exploitation of CVE-2025-38527 in the wild and no public exploit code.\n\nAffected product: Debian Debian Linux. 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-2025-38527/ (Markdown: https://insights.sbomify.com/CVE-2025-38527/index.md)","id":"CVE-2025-38527","markdown":"https://insights.sbomify.com/CVE-2025-38527/index.md","name":"CVE-2025-38527","record":{"aliases":["AZL-66401","AZL-73554","BELL-CVE-2025-38527","DEBIAN-CVE-2025-38527","GHSA-hm6q-hprh-4f22","ROOT-OS-DEBIAN-11-CVE-2025-38527","ROOT-OS-DEBIAN-12-CVE-2025-38527","ROOT-OS-DEBIAN-13-CVE-2025-38527","ROOT-OS-UBUNTU-2204-CVE-2025-38527","ROOT-OS-UBUNTU-2404-CVE-2025-38527","UBUNTU-CVE-2025-38527"],"analysis":{"component_type":"kernel","fix_type":"patch","impacts":["code_execution","denial_of_service"],"network_reachable":"yes","non_default_config":false,"product_category":"Linux kernel SMB client","requires_auth":"none","summary":"A race condition in the Linux kernel SMB client allows a use-after-free during unmount, potentially leading to code execution or denial of service.","user_interaction":"not_required","vuln_class":"use_after_free"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"Linux","cpe":[{"product":"debian_linux","vendor":"debian"},{"product":"linux_kernel","vendor":"linux"}],"cvss":{"score":9.8,"severity":"critical","source":"cna","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","version":"3.1"},"cwes":[{"id":"CWE-416","name":"Use After Free"}],"description":"In the Linux kernel, the following vulnerability has been resolved:\n\nsmb: client: fix use-after-free in cifs_oplock_break\n\nA race condition can occur in cifs_oplock_break() leading to a\nuse-after-free of the cinode structure when unmounting:\n\n  cifs_oplock_break()\n    _cifsFileInfo_put(cfile)\n      cifsFileInfo_put_final()\n        cifs_sb_deactive()\n          [last ref, start releasing sb]\n            kill_sb()\n              kill_anon_super()\n                generic_shutdown_super()\n                  evict_inodes()\n                    dispose_list()\n                      evict()\n                        destroy_inode()\n                          call_rcu(\u0026inode-\u003ei_rcu, i_callback)\n    spin_lock(\u0026cinode-\u003eopen_file_lock)  \u003c- OK\n                            [later] i_callback()\n                              cifs_free_inode()\n                                kmem_cache_free(cinode)\n    spin_unlock(\u0026cinode-\u003eopen_file_lock)  \u003c- UAF\n    cifs_done_oplock_break(cinode)       \u003c- UAF\n\nThe issue occurs when umount has already released its reference to the\nsuperblock. When _cifsFileInfo_put() calls cifs_sb_deactive(), this\nreleases the last reference, triggering the immediate cleanup of all\ninodes under RCU. However, cifs_oplock_break() continues to access the\ncinode after this point, resulting in use-after-free.\n\nFix this by holding an extra reference to the superblock during the\nentire oplock break operation. This ensures that the superblock and\nits inodes remain valid until the oplock break completes.","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":"smb: client: fix use-after-free in cifs_oplock_break","id":"CVE-2025-38527","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":null,"product":"debian:debian_linux","products":["debian:debian_linux","linux:linux_kernel"],"type":"use_after_free","year":"2025"},"n_packages":0,"n_references":6,"next":{"headline":"bpf: Reject %p% format string in bprintf-like helpers","id":"CVE-2025-38528"},"packages":[],"prev":{"headline":"ice: add NULL check in eswitch lag check","id":"CVE-2025-38526"},"products":["Linux"],"published":"2025-08-16","related":[{"cvss_score":10,"headline":"ProFTPD Improper Access Control","id":"CVE-2015-3306","kev_date_added":"2026-10-08","published":"2015-05-18"},{"cvss_score":9.9,"headline":"RoundCube Webmail Deserialization of Untrusted Data","id":"CVE-2025-49113","kev_date_added":"2026-02-20","published":"2025-06-02"},{"cvss_score":9.8,"headline":"GNU InetUtils Argument Injection","id":"CVE-2026-24061","kev_date_added":"2026-01-26","published":"2026-01-21"},{"cvss_score":9.8,"headline":"Linux Kernel Improper Check for Unusual or Exceptional Conditions","id":"CVE-2025-39682","kev_date_added":"2026-09-18","published":"2025-09-05"},{"cvss_score":9.8,"headline":"Mozilla Firefox Use-After-Free","id":"CVE-2024-9680","kev_date_added":"2024-10-15","published":"2024-10-09"},{"cvss_score":9.8,"headline":"RARLAB UnRAR Directory Traversal","id":"CVE-2022-30333","kev_date_added":"2022-08-09","published":"2022-05-09"},{"cvss_score":9.8,"headline":"Roundcube Webmail SQL Injection","id":"CVE-2021-44026","kev_date_added":"2023-06-22","published":"2021-11-19"}],"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)"}],"ssvc":{"automatable":"yes","exploitation":"none","technical_impact":"total"},"state":"PUBLISHED","updated":"2026-10-15","vendors":["Linux"]},"summary":"A race condition in the Linux kernel SMB client allows a use-after-free during unmount, potentially leading to code execution or denial of service.","url":"https://insights.sbomify.com/CVE-2025-38527/"}