{"answers":{"affected":"","exploited":"There is no known exploitation of CVE-2026-89839 in the wild and no public exploit code.","fix":"Apply the vendor's patch.","what":"CVE-2026-89839 is a missing authorization vulnerability in Linux, published on 16 Sep 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-2026-89839 and fix it if it is affected.\n\nWhat it is: CVE-2026-89839 is a missing authorization vulnerability in Linux, published on 16 Sep 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-2026-89839 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-2026-89839/ (Markdown: https://insights.sbomify.com/CVE-2026-89839/index.md)","id":"CVE-2026-89839","markdown":"https://insights.sbomify.com/CVE-2026-89839/index.md","name":"CVE-2026-89839","record":{"aliases":["AZL-101223","BELL-CVE-2026-89839","DEBIAN-CVE-2026-89839","GHSA-hf9x-gfgm-hfj2","UBUNTU-CVE-2026-89839"],"analysis":{"component_type":"kernel","fix_type":"patch","impacts":["privilege_escalation","security_bypass"],"network_reachable":"adjacent_or_local","non_default_config":true,"product_category":"Linux kernel filesystem","requires_auth":"low_privilege","summary":"Local attackers can bypass owner checks on idmapped mounts to modify extended attributes, potentially leading to privilege escalation or unauthorized access.","user_interaction":"not_required","vuln_class":"missing_authorization"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"Linux","cpe":[],"cvss":{"score":null,"severity":null,"source":null,"vector":null,"version":null},"cwes":[],"description":"In the Linux kernel, the following vulnerability has been resolved:\n\nf2fs: use the mount idmap for the owner check in f2fs_xattr_advise_set()\n\nf2fs_xattr_advise_set() calls inode_owner_or_capable() with \u0026nop_mnt_idmap\nbefore allowing the \"system.advise\" xattr to be set, instead of the idmap\nthat the VFS passes to the -\u003eset() handler.\n\nf2fs supports idmapped mounts, so on such a mount this checks the caller's\nfsuid against the unmapped on-disk owner rather than the mapped owner: the\nactual owner can be wrongly denied with -EPERM and an unrelated caller\nwrongly allowed.  Pass the handler's idmap instead.","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":"f2fs: use the mount idmap for the owner check in f2fs_xattr_advise_set()","id":"CVE-2026-89839","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":null,"product":null,"products":[],"type":"missing_authorization","year":"2026"},"n_packages":0,"n_references":5,"next":{"headline":"f2fs: validate MOVE_RANGE destination size","id":"CVE-2026-89840"},"packages":[],"prev":{"headline":"f2fs: limit recovery filename logging to stored length","id":"CVE-2026-89838"},"products":["Linux"],"published":"2026-09-16","related":[],"sources":[{"class":"attribution","licence":"CVE Terms of Use (MITRE)","name":"CVE List","prefix":"CVE"}],"ssvc":{"automatable":null,"exploitation":null,"technical_impact":null},"state":"PUBLISHED","updated":"2026-10-19","vendors":["Linux"]},"summary":"Local attackers can bypass owner checks on idmapped mounts to modify extended attributes, potentially leading to privilege escalation or unauthorized access.","url":"https://insights.sbomify.com/CVE-2026-89839/"}