{"answers":{"affected":"It affects 1 product.","exploited":"There is no known exploitation of CVE-2025-38256 in the wild and no public exploit code.","fix":"Apply the vendor's patch.","what":"CVE-2025-38256 is a medium-severity vulnerability in Linux kernel, published on 9 Jul 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-2025-38256 and fix it if it is affected.\n\nWhat it is: CVE-2025-38256 is a medium-severity vulnerability in Linux kernel, published on 9 Jul 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-2025-38256 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-2025-38256/ (Markdown: https://insights.sbomify.com/CVE-2025-38256/index.md)","id":"CVE-2025-38256","markdown":"https://insights.sbomify.com/CVE-2025-38256/index.md","name":"CVE-2025-38256","record":{"aliases":["BELL-CVE-2025-38256","DEBIAN-CVE-2025-38256","GHSA-83mm-95m8-59x2","UBUNTU-CVE-2025-38256"],"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 bug in Linux kernel io_uring resource handling causes a kernel panic during unpinning, leading to denial of service.","user_interaction":"not_required","vuln_class":"null_dereference"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"Linux","cpe":[{"product":"linux_kernel","vendor":"linux"}],"cvss":{"score":5.5,"severity":"medium","source":"nvd","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","version":"3.1"},"cwes":[],"description":"In the Linux kernel, the following vulnerability has been resolved:\n\nio_uring/rsrc: fix folio unpinning\n\nsyzbot complains about an unmapping failure:\n\n[  108.070381][   T14] kernel BUG at mm/gup.c:71!\n[  108.070502][   T14] Internal error: Oops - BUG: 00000000f2000800 [#1]  SMP\n[  108.123672][   T14] Hardware name: QEMU KVM Virtual Machine, BIOS edk2-20250221-8.fc42 02/21/2025\n[  108.127458][   T14] Workqueue: iou_exit io_ring_exit_work\n[  108.174205][   T14] Call trace:\n[  108.175649][   T14]  sanity_check_pinned_pages+0x7cc/0x7d0 (P)\n[  108.178138][   T14]  unpin_user_page+0x80/0x10c\n[  108.180189][   T14]  io_release_ubuf+0x84/0xf8\n[  108.182196][   T14]  io_free_rsrc_node+0x250/0x57c\n[  108.184345][   T14]  io_rsrc_data_free+0x148/0x298\n[  108.186493][   T14]  io_sqe_buffers_unregister+0x84/0xa0\n[  108.188991][   T14]  io_ring_ctx_free+0x48/0x480\n[  108.191057][   T14]  io_ring_exit_work+0x764/0x7d8\n[  108.193207][   T14]  process_one_work+0x7e8/0x155c\n[  108.195431][   T14]  worker_thread+0x958/0xed8\n[  108.197561][   T14]  kthread+0x5fc/0x75c\n[  108.199362][   T14]  ret_from_fork+0x10/0x20\n\nWe can pin a tail page of a folio, but then io_uring will try to unpin\nthe head page of the folio. While it should be fine in terms of keeping\nthe page actually alive, mm folks say it's wrong and triggers a debug\nwarning. Use unpin_user_folio() instead of unpin_user_page*.\n\n[axboe: adapt to current tree, massage commit message]","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":"io_uring/rsrc: fix folio unpinning","id":"CVE-2025-38256","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":null,"product":"linux:linux_kernel","products":["linux:linux_kernel"],"type":"null_dereference","year":"2025"},"n_packages":0,"n_references":3,"next":{"headline":"s390/pkey: Prevent overflow in size calculation for memdup_user()","id":"CVE-2025-38257"},"packages":[],"prev":{"headline":"lib/group_cpus: fix NULL pointer dereference from group_cpus_evenly()","id":"CVE-2025-38255"},"products":["Linux"],"published":"2025-07-09","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)"}],"ssvc":{"automatable":null,"exploitation":null,"technical_impact":null},"state":"PUBLISHED","updated":"2026-05-11","vendors":["Linux"]},"summary":"A bug in Linux kernel io_uring resource handling causes a kernel panic during unpinning, leading to denial of service.","url":"https://insights.sbomify.com/CVE-2025-38256/"}