{"answers":{"affected":"","exploited":"There is no known exploitation of CVE-2026-72080 in the wild and no public exploit code.","fix":"Apply the vendor's patch.","what":"CVE-2026-72080 is a high-severity use after free vulnerability in Linux, published on 15 Aug 2026. 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-2026-72080 and fix it if it is affected.\n\nWhat it is: CVE-2026-72080 is a high-severity use after free vulnerability in Linux, published on 15 Aug 2026. 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-2026-72080 in the wild and no public exploit code.\n\nAffected product: 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-2026-72080/ (Markdown: https://insights.sbomify.com/CVE-2026-72080/index.md)","id":"CVE-2026-72080","markdown":"https://insights.sbomify.com/CVE-2026-72080/index.md","name":"CVE-2026-72080","record":{"aliases":["BELL-CVE-2026-72080","DEBIAN-CVE-2026-72080","GHSA-3mx4-vrgg-r9xh","UBUNTU-CVE-2026-72080"],"analysis":{"component_type":"kernel","fix_type":"patch","impacts":["code_execution","privilege_escalation"],"network_reachable":"adjacent_or_local","non_default_config":false,"product_category":"Linux kernel","requires_auth":"low_privilege","summary":"A use-after-free in the Linux kernel resctrl filesystem allows local attackers to execute arbitrary code or escalate privileges during unmount operations.","user_interaction":"not_required","vuln_class":"use_after_free"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"Linux","cpe":[],"cvss":{"score":7.8,"severity":"high","source":"cna","vector":"CVSS:3.1/AV:L/AC:L/PR:L/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\nfs/resctrl: Fix use-after-free during unmount\n\nDuring unmount or failure teardown all mon_data structures that contain\nmonitoring event file private data are freed after which kernfs nodes are\nremoved. However, the RDT_DELETED flag is never set for the statically\nallocated default resource group.\n\nA concurrent reader of an event file associated with the default resource\ngroup may, after dropping kernfs active protection, block on rdtgroup_mutex\nwhile unmount proceeds to free the file private data and destroy the kernfs\nnode without waiting for the reader.\n\nWhen the mutex is released, the reader wakes up, observes that RDT_DELETED\nis not set for the default group, and dereferences the already-freed\nfile private data.\n\nThe scenario can be depicted as follows:\n  CPU0                                      CPU1\n   /*\n    * Default resource group's\n    * monitoring data accessible via\n    * kernfs file with kernfs_node::priv\n    * pointing to a struct mon_data.\n    * User opens the file for reading.\n    */\n   rdtgroup_mondata_show()                 /* arch encounters fatal error */\n    rdtgroup_kn_lock_live()                 resctrl_exit()\n     atomic_inc(\u0026rdtgroup_default.waitcount) cpus_read_lock()\n     kernfs_break_active_protection(kn)      mutex_lock(\u0026rdtgroup_mutex)\n     cpus_read_lock()                        resctrl_fs_teardown()\n     mutex_lock(\u0026rdtgroup_mutex)              rmdir_all_sub()\n                                              mon_put_kn_priv()\n                                               /* Delete all mon_data structures */\n                                              rdtgroup_destroy_root()\n                                               kernfs_destroy_root()\n                                               rdtgroup_default.kn = NULL\n                                             mutex_unlock(\u0026rdtgroup_mutex)\n     /*\n      * rdtgroup_default.flags is empty so\n      * rdtgroup_kn_lock_live() returns\n      * \u0026rdtgroup_default\n      */\n     md = of-\u003ekn-\u003epriv;\n\n     /* md points to freed mon_data */\n\nSet RDT_DELETED for the default group unconditionally since the flag does\nnot lead to the freeing of this statically allocated group.\n\nDo not allow a new resctrl mount if there are any waiters on default group\nof previous mount. A new mount will re-initialize the default group that\nwould appear to waiters from previous mount as though the default group is\naccessible causing them to access the mon_data structures from the previous\nmount that have been removed.","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":"fs/resctrl: Fix use-after-free during unmount","id":"CVE-2026-72080","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":null,"product":null,"products":[],"type":"use_after_free","year":"2026"},"n_packages":0,"n_references":3,"next":{"headline":"scsi: elx: efct: Fix I/O leak on unsupported additional CDB","id":"CVE-2026-72081"},"packages":[],"prev":{"headline":"Input: ims-pcu - fix use-after-free and double-free in disconnect","id":"CVE-2026-72079"},"products":["Linux"],"published":"2026-08-15","related":[],"sources":[{"class":"attribution","licence":"CVE Terms of Use (MITRE)","name":"CVE List","prefix":"CVE"},{"class":"attribution","licence":"CWE Terms of Use","name":"CWE (MITRE)"},{"class":"attribution","licence":"FIRST CVSS licence","name":"CVSS (FIRST)"}],"ssvc":{"automatable":"no","exploitation":"none","technical_impact":"total"},"state":"PUBLISHED","updated":"2026-10-19","vendors":["Linux"]},"summary":"A use-after-free in the Linux kernel resctrl filesystem allows local attackers to execute arbitrary code or escalate privileges during unmount operations.","url":"https://insights.sbomify.com/CVE-2026-72080/"}