{"answers":{"affected":"It affects 2 products.","exploited":"There is no known exploitation of CVE-2025-38063 in the wild and no public exploit code.","fix":"Apply the vendor's patch.","what":"CVE-2025-38063 is a medium-severity denial of service vulnerability in Debian Debian Linux, published on 18 Jun 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-2025-38063 and fix it if it is affected.\n\nWhat it is: CVE-2025-38063 is a medium-severity denial of service vulnerability in Debian Debian Linux, published on 18 Jun 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-2025-38063 in the wild and no public exploit code.\n\nAffected product: Debian Debian 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-2025-38063/ (Markdown: https://insights.sbomify.com/CVE-2025-38063/index.md)","id":"CVE-2025-38063","markdown":"https://insights.sbomify.com/CVE-2025-38063/index.md","name":"CVE-2025-38063","record":{"aliases":["AZL-64031","AZL-72707","BELL-CVE-2025-38063","DEBIAN-CVE-2025-38063","GHSA-jcxc-rghj-26cf","ROOT-OS-DEBIAN-11-CVE-2025-38063","ROOT-OS-DEBIAN-12-CVE-2025-38063","ROOT-OS-UBUNTU-2204-CVE-2025-38063","ROOT-OS-UBUNTU-2404-CVE-2025-38063","UBUNTU-CVE-2025-38063"],"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 flaw in the Linux kernel's device-mapper layer causes unconditional IO throttling of flush operations, potentially leading to system hangs or denial of service.","user_interaction":"not_required","vuln_class":"denial_of_service"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"Linux","cpe":[{"product":"debian_linux","vendor":"debian"},{"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\ndm: fix unconditional IO throttle caused by REQ_PREFLUSH\n\nWhen a bio with REQ_PREFLUSH is submitted to dm, __send_empty_flush()\ngenerates a flush_bio with REQ_OP_WRITE | REQ_PREFLUSH | REQ_SYNC,\nwhich causes the flush_bio to be throttled by wbt_wait().\n\nAn example from v5.4, similar problem also exists in upstream:\n\n    crash\u003e bt 2091206\n    PID: 2091206  TASK: ffff2050df92a300  CPU: 109  COMMAND: \"kworker/u260:0\"\n     #0 [ffff800084a2f7f0] __switch_to at ffff80004008aeb8\n     #1 [ffff800084a2f820] __schedule at ffff800040bfa0c4\n     #2 [ffff800084a2f880] schedule at ffff800040bfa4b4\n     #3 [ffff800084a2f8a0] io_schedule at ffff800040bfa9c4\n     #4 [ffff800084a2f8c0] rq_qos_wait at ffff8000405925bc\n     #5 [ffff800084a2f940] wbt_wait at ffff8000405bb3a0\n     #6 [ffff800084a2f9a0] __rq_qos_throttle at ffff800040592254\n     #7 [ffff800084a2f9c0] blk_mq_make_request at ffff80004057cf38\n     #8 [ffff800084a2fa60] generic_make_request at ffff800040570138\n     #9 [ffff800084a2fae0] submit_bio at ffff8000405703b4\n    #10 [ffff800084a2fb50] xlog_write_iclog at ffff800001280834 [xfs]\n    #11 [ffff800084a2fbb0] xlog_sync at ffff800001280c3c [xfs]\n    #12 [ffff800084a2fbf0] xlog_state_release_iclog at ffff800001280df4 [xfs]\n    #13 [ffff800084a2fc10] xlog_write at ffff80000128203c [xfs]\n    #14 [ffff800084a2fcd0] xlog_cil_push at ffff8000012846dc [xfs]\n    #15 [ffff800084a2fda0] xlog_cil_push_work at ffff800001284a2c [xfs]\n    #16 [ffff800084a2fdb0] process_one_work at ffff800040111d08\n    #17 [ffff800084a2fe00] worker_thread at ffff8000401121cc\n    #18 [ffff800084a2fe70] kthread at ffff800040118de4\n\nAfter commit 2def2845cc33 (\"xfs: don't allow log IO to be throttled\"),\nthe metadata submitted by xlog_write_iclog() should not be throttled.\nBut due to the existence of the dm layer, throttling flush_bio indirectly\ncauses the metadata bio to be throttled.\n\nFix this by conditionally adding REQ_IDLE to flush_bio.bi_opf, which makes\nwbt_should_throttle() return false to avoid wbt_wait().","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":"dm: fix unconditional IO throttle caused by REQ_PREFLUSH","id":"CVE-2025-38063","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":null,"product":"debian:debian_linux","products":["debian:debian_linux","linux:linux_kernel"],"type":"denial_of_service","year":"2025"},"n_packages":0,"n_references":5,"next":{"headline":"virtio: break and reset virtio devices on device_shutdown()","id":"CVE-2025-38064"},"packages":[],"prev":{"headline":"genirq/msi: Store the IOMMU IOVA directly in msi_desc instead of iommu_cookie","id":"CVE-2025-38062"},"products":["Linux"],"published":"2025-06-18","related":[{"cvss_score":10,"headline":"ProFTPD Improper Access Control","id":"CVE-2015-3306","kev_date_added":"2026-10-08","published":"2015-05-18"},{"cvss_score":9.9,"headline":"RoundCube Webmail Deserialization of Untrusted Data","id":"CVE-2025-49113","kev_date_added":"2026-02-20","published":"2025-06-02"},{"cvss_score":9.8,"headline":"GNU InetUtils Argument Injection","id":"CVE-2026-24061","kev_date_added":"2026-01-26","published":"2026-01-21"},{"cvss_score":9.8,"headline":"Linux Kernel Improper Check for Unusual or Exceptional Conditions","id":"CVE-2025-39682","kev_date_added":"2026-09-18","published":"2025-09-05"},{"cvss_score":9.8,"headline":"Mozilla Firefox Use-After-Free","id":"CVE-2024-9680","kev_date_added":"2024-10-15","published":"2024-10-09"},{"cvss_score":9.8,"headline":"RARLAB UnRAR Directory Traversal","id":"CVE-2022-30333","kev_date_added":"2022-08-09","published":"2022-05-09"},{"cvss_score":9.8,"headline":"Roundcube Webmail SQL Injection","id":"CVE-2021-44026","kev_date_added":"2023-06-22","published":"2021-11-19"}],"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":"2026-10-15","vendors":["Linux"]},"summary":"A flaw in the Linux kernel's device-mapper layer causes unconditional IO throttling of flush operations, potentially leading to system hangs or denial of service.","url":"https://insights.sbomify.com/CVE-2025-38063/"}