{"answers":{"affected":"It affects 1 product.","exploited":"There is no known exploitation of CVE-2025-21751 in the wild and no public exploit code.","fix":"Apply the vendor's patch.","what":"CVE-2025-21751 is a high-severity use after free vulnerability in Linux kernel, published on 27 Feb 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-2025-21751 and fix it if it is affected.\n\nWhat it is: CVE-2025-21751 is a high-severity use after free vulnerability in Linux kernel, published on 27 Feb 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-2025-21751 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-2025-21751/ (Markdown: https://insights.sbomify.com/CVE-2025-21751/index.md)","id":"CVE-2025-21751","markdown":"https://insights.sbomify.com/CVE-2025-21751/index.md","name":"CVE-2025-21751","record":{"aliases":["BELL-CVE-2025-21751","DEBIAN-CVE-2025-21751","GHSA-6cpx-w2cg-qmgr","ROOT-OS-DEBIAN-11-CVE-2025-21751","ROOT-OS-DEBIAN-12-CVE-2025-21751","ROOT-OS-DEBIAN-13-CVE-2025-21751","ROOT-OS-UBUNTU-2204-CVE-2025-21751","ROOT-OS-UBUNTU-2404-CVE-2025-21751","UBUNTU-CVE-2025-21751"],"analysis":{"component_type":"kernel","fix_type":"patch","impacts":["denial_of_service"],"network_reachable":"adjacent_or_local","non_default_config":false,"product_category":"Linux kernel driver","requires_auth":"low_privilege","summary":"A use-after-free vulnerability in the Linux kernel mlx5 driver allows a local attacker to cause a system crash via firmware failure during matcher disconnect.","user_interaction":"not_required","vuln_class":"use_after_free"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"Linux","cpe":[{"product":"linux_kernel","vendor":"linux"}],"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":[{"id":"CWE-416","name":"Use After Free"}],"description":"In the Linux kernel, the following vulnerability has been resolved:\n\nnet/mlx5: HWS, change error flow on matcher disconnect\n\nCurrently, when firmware failure occurs during matcher disconnect flow,\nthe error flow of the function reconnects the matcher back and returns\nan error, which continues running the calling function and eventually\nfrees the matcher that is being disconnected.\nThis leads to a case where we have a freed matcher on the matchers list,\nwhich in turn leads to use-after-free and eventual crash.\n\nThis patch fixes that by not trying to reconnect the matcher back when\nsome FW command fails during disconnect.\n\nNote that we're dealing here with FW error. We can't overcome this\nproblem. This might lead to bad steering state (e.g. wrong connection\nbetween matchers), and will also lead to resource leakage, as it is\nthe case with any other error handling during resource destruction.\n\nHowever, the goal here is to allow the driver to continue and not crash\nthe machine with use-after-free error.","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":"net/mlx5: HWS, change error flow on matcher disconnect","id":"CVE-2025-21751","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":null,"product":"linux:linux_kernel","products":["linux:linux_kernel"],"type":"use_after_free","year":"2025"},"n_packages":0,"n_references":3,"next":{"headline":"btrfs: don't use btrfs_set_item_key_safe on RAID stripe-extents","id":"CVE-2025-21752"},"packages":[],"prev":{"headline":"wifi: brcmfmac: Check the return value of of_property_read_string_index()","id":"CVE-2025-21750"},"products":["Linux"],"published":"2025-02-27","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":"CWE Terms of Use","name":"CWE (MITRE)"},{"class":"attribution","licence":"FIRST CVSS licence","name":"CVSS (FIRST)"}],"ssvc":{"automatable":"no","exploitation":"none","technical_impact":"total"},"state":"PUBLISHED","updated":"2026-08-05","vendors":["Linux"]},"summary":"A use-after-free vulnerability in the Linux kernel mlx5 driver allows a local attacker to cause a system crash via firmware failure during matcher disconnect.","url":"https://insights.sbomify.com/CVE-2025-21751/"}