{"answers":{"affected":"","exploited":"There is no known exploitation of CVE-2025-40287 in the wild and no public exploit code.","fix":"Apply the vendor's patch.","what":"CVE-2025-40287 is a denial of service vulnerability in Linux, published on 6 Dec 2025. 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-2025-40287 and fix it if it is affected.\n\nWhat it is: CVE-2025-40287 is a denial of service vulnerability in Linux, published on 6 Dec 2025. 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-2025-40287 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-2025-40287/ (Markdown: https://insights.sbomify.com/CVE-2025-40287/index.md)","id":"CVE-2025-40287","markdown":"https://insights.sbomify.com/CVE-2025-40287/index.md","name":"CVE-2025-40287","record":{"aliases":["BELL-CVE-2025-40287","DEBIAN-CVE-2025-40287","GHSA-vj97-73gp-638r","ROOT-OS-DEBIAN-12-CVE-2025-40287","ROOT-OS-DEBIAN-13-CVE-2025-40287","ROOT-OS-UBUNTU-2204-CVE-2025-40287","ROOT-OS-UBUNTU-2404-CVE-2025-40287","UBUNTU-CVE-2025-40287"],"analysis":{"component_type":"kernel","fix_type":"patch","impacts":["denial_of_service"],"network_reachable":"adjacent_or_local","non_default_config":false,"product_category":"Linux kernel","requires_auth":"low_privilege","summary":"A local attacker can cause a kernel hang and denial of service by mounting a malformed exFAT filesystem and triggering specific system calls.","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\nexfat: fix improper check of dentry.stream.valid_size\n\nWe found an infinite loop bug in the exFAT file system that can lead to a\nDenial-of-Service (DoS) condition. When a dentry in an exFAT filesystem is\nmalformed, the following system calls — SYS_openat, SYS_ftruncate, and\nSYS_pwrite64 — can cause the kernel to hang.\n\nRoot cause analysis shows that the size validation code in exfat_find()\ndoes not check whether dentry.stream.valid_size is negative. As a result,\nthe system calls mentioned above can succeed and eventually trigger the DoS\nissue.\n\nThis patch adds a check for negative dentry.stream.valid_size to prevent\nthis vulnerability.","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":"exfat: fix improper check of dentry.stream.valid_size","id":"CVE-2025-40287","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":null,"product":null,"products":[],"type":"denial_of_service","year":"2025"},"n_packages":0,"n_references":3,"next":{"headline":"drm/amdgpu: Fix NULL pointer dereference in VRAM logic for APU devices","id":"CVE-2025-40288"},"packages":[],"prev":{"headline":"smb/server: fix possible memory leak in smb2_read()","id":"CVE-2025-40286"},"products":["Linux"],"published":"2025-12-06","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":"2026-05-11","vendors":["Linux"]},"summary":"A local attacker can cause a kernel hang and denial of service by mounting a malformed exFAT filesystem and triggering specific system calls.","url":"https://insights.sbomify.com/CVE-2025-40287/"}