{"answers":{"affected":"","exploited":"There is no known exploitation of CVE-2026-97521 in the wild and no public exploit code.","fix":"Apply the vendor's patch.","what":"CVE-2026-97521 is a denial of service vulnerability in Linux, published on 24 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-2026-97521 and fix it if it is affected.\n\nWhat it is: CVE-2026-97521 is a denial of service vulnerability in Linux, published on 24 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-2026-97521 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-2026-97521/ (Markdown: https://insights.sbomify.com/CVE-2026-97521/index.md)","id":"CVE-2026-97521","markdown":"https://insights.sbomify.com/CVE-2026-97521/index.md","name":"CVE-2026-97521","record":{"aliases":["AZL-103757","BELL-CVE-2026-97521","DEBIAN-CVE-2026-97521","GHSA-jgmg-x8vv-p7hr","UBUNTU-CVE-2026-97521"],"analysis":{"component_type":"kernel","fix_type":"patch","impacts":["denial_of_service"],"network_reachable":"adjacent_or_local","non_default_config":true,"product_category":"Linux kernel","requires_auth":"none","summary":"A local attacker can cause a kernel crash in the GFS2 filesystem on PREEMPT_RT systems by triggering a sleeping function call in an atomic context.","user_interaction":"not_required","vuln_class":"denial_of_service"},"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\ngfs2: fix quota init duplicate scan\n\ngfs2_quota_init() checks for duplicate quota_change IDs while holding\nqd_lock and the quota hash bucket bitlock. That path used\ngfs2_qd_search_bucket(), which takes a lockref reference via\nlockref_get_not_dead().\n\nOn PREEMPT_RT this may sleep, which is not allowed under the bucket\nbitlock, triggering \"sleeping function called from invalid context\".\n\nUse a no-ref bucket lookup in this path, then continue duplicate\nhandling without taking a lockref there.\n\nRefactor gfs2_qd_search_bucket() to build on top of the no-ref helper\nso lookup traversal stays in one place.\n\nThis patch fixes a bug reported by syzbot.","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":"gfs2: fix quota init duplicate scan","id":"CVE-2026-97521","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":null,"product":null,"products":[],"type":"denial_of_service","year":"2026"},"n_packages":0,"n_references":3,"next":{"headline":"mptcp: fix bad accounting in __mptcp_subflow_push_pending()","id":"CVE-2026-97522"},"packages":[],"prev":{"headline":"gfs2: move quota_init qc iterator increment","id":"CVE-2026-97520"},"products":["Linux"],"published":"2026-09-24","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":"2026-09-28","vendors":["Linux"]},"summary":"A local attacker can cause a kernel crash in the GFS2 filesystem on PREEMPT_RT systems by triggering a sleeping function call in an atomic context.","url":"https://insights.sbomify.com/CVE-2026-97521/"}