{"answers":{"affected":"It affects 2 products.","exploited":"There is no known exploitation of CVE-2026-31694 in the wild and no public exploit code.","fix":"Apply the vendor's patch.","what":"CVE-2026-31694 is a high-severity memory corruption vulnerability in Linux kernel, published on 1 May 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-2026-31694 and fix it if it is affected.\n\nWhat it is: CVE-2026-31694 is a high-severity memory corruption vulnerability in Linux kernel, published on 1 May 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-2026-31694 in the wild and no public exploit code.\n\nAffected product: Linux kernel. 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-2026-31694/ (Markdown: https://insights.sbomify.com/CVE-2026-31694/index.md)","id":"CVE-2026-31694","markdown":"https://insights.sbomify.com/CVE-2026-31694/index.md","name":"CVE-2026-31694","record":{"aliases":["AZL-85424","BELL-CVE-2026-31694","DEBIAN-CVE-2026-31694","GHSA-8fxx-fj7q-42m6","ROOT-OS-DEBIAN-11-CVE-2026-31694","ROOT-OS-DEBIAN-12-CVE-2026-31694","ROOT-OS-UBUNTU-2204-CVE-2026-31694","ROOT-OS-UBUNTU-2404-CVE-2026-31694","UBUNTU-CVE-2026-31694"],"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 FUSE","requires_auth":"low_privilege","summary":"A malicious FUSE server can trigger a kernel buffer overflow via oversized directory entries, potentially leading to code execution or privilege escalation.","user_interaction":"not_required","vuln_class":"memory_corruption"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"Linux","cpe":[{"product":"linux_kernel","vendor":"linux"},{"product":"simatic_s7-1500_tm_mfp_firmware","vendor":"siemens"}],"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":[],"description":"In the Linux kernel, the following vulnerability has been resolved:\n\nfuse: reject oversized dirents in page cache\n\nfuse_add_dirent_to_cache() computes a serialized dirent size from the\nserver-controlled namelen field and copies the dirent into a single\npage-cache page. The existing logic only checks whether the dirent fits\nin the remaining space of the current page and advances to a fresh page\nif not. It never checks whether the dirent itself exceeds PAGE_SIZE.\n\nAs a result, a malicious FUSE server can return a dirent with\nnamelen=4095, producing a serialized record size of 4120 bytes. On 4 KiB\npage systems this causes memcpy() to overflow the cache page by 24 bytes\ninto the following kernel page.\n\nReject dirents that cannot fit in a single page before copying them into\nthe readdir cache.","ecosystems":[],"exploits":{"exploitdb":0,"first_seen":"2026-06-30","github_poc":1,"max_poc_stars":18,"metasploit":0,"nuclei":0,"refs":[{"date":"2026-06-30T11:49:36Z","kind":"github_poc","ref":"https://github.com/0xCyberstan/CVE-2026-31694-POC","stars":18,"title":"Linux kernel FUSE readdir cache out-of-bounds write (CVE-2026-31694): a malicious FUSE server overflows a page-cache page by 24 bytes. PoC plus an unprivileged local-root exploit via /etc/passwd page-cache corruption. Run only inside a VM."}],"tier":"poc_unverified"},"has_fix":true,"headline":"fuse: reject oversized dirents in page cache","id":"CVE-2026-31694","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":null,"product":"linux:linux_kernel","products":["linux:linux_kernel"],"type":"memory_corruption","year":"2026"},"n_packages":0,"n_references":3,"next":{"headline":"wifi: virt_wifi: remove SET_NETDEV_DEV to avoid use-after-free","id":"CVE-2026-31695"},"packages":[],"prev":{"headline":"cifs: some missing initializations on replay","id":"CVE-2026-31693"},"products":["Linux"],"published":"2026-05-01","related":[{"cvss_score":8.8,"headline":"Linux Kernel Out-of-Bounds Write","id":"CVE-2026-53266","kev_date_added":"2026-09-18","published":"2026-06-25"},{"cvss_score":8.8,"headline":"Linux Kernel Improper Input Validation","id":"CVE-2013-6282","kev_date_added":"2022-09-15","published":"2013-11-19"},{"cvss_score":8.4,"headline":"Linux Kernel Heap-Based Buffer Overflow","id":"CVE-2022-0185","kev_date_added":"2024-08-21","published":"2022-02-11"},{"cvss_score":8.4,"headline":"Linux Kernel Privilege Escalation","id":"CVE-2013-2094","kev_date_added":"2022-09-15","published":"2013-05-14"},{"cvss_score":7.8,"headline":"Linux Kernel Unspecified","id":"CVE-2026-53362","kev_date_added":"2026-08-27","published":"2026-07-04"},{"cvss_score":7.8,"headline":"Linux Kernel Missing Initialization of a Variable","id":"CVE-2026-46300","kev_date_added":"2026-10-28","published":"2026-05-23"},{"cvss_score":7.8,"headline":"Linux Kernel Race Condition","id":"CVE-2025-39964","kev_date_added":"2026-09-18","published":"2025-10-13"}],"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":"FIRST CVSS licence","name":"CVSS (FIRST)"},{"class":"open","licence":"CC0","name":"PoC-in-GitHub"}],"ssvc":{"automatable":null,"exploitation":null,"technical_impact":null},"state":"PUBLISHED","updated":"2026-10-15","vendors":["Linux"]},"summary":"A malicious FUSE server can trigger a kernel buffer overflow via oversized directory entries, potentially leading to code execution or privilege escalation.","url":"https://insights.sbomify.com/CVE-2026-31694/"}