{"answers":{"affected":"It affects 1 product.","exploited":"There is no known exploitation of CVE-2026-64600 in the wild and no public exploit code.","fix":"Apply the vendor's patch.","what":"CVE-2026-64600 is a high-severity vulnerability in Linux kernel, published on 23 Jul 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-2026-64600 and fix it if it is affected.\n\nWhat it is: CVE-2026-64600 is a high-severity vulnerability in Linux kernel, published on 23 Jul 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-2026-64600 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-2026-64600/ (Markdown: https://insights.sbomify.com/CVE-2026-64600/index.md)","id":"CVE-2026-64600","markdown":"https://insights.sbomify.com/CVE-2026-64600/index.md","name":"CVE-2026-64600","record":{"aliases":["AZL-93050","BELL-CVE-2026-64600","CLSA-2026-1784277735","CLSA-2026-1784278790","DEBIAN-CVE-2026-64600","GHSA-6p99-w6f4-qcvq","RHBA-2026:39321","RHBA-2026:39332","RHBA-2026:41013","RHBA-2026:41254","RHSA-2026:46951","RHSA-2026:47981","RHSA-2026:47983","RHSA-2026:47984","RHSA-2026:47997","RHSA-2026:47998","RHSA-2026:48016","ROOT-OS-DEBIAN-12-CVE-2026-64600","ROOT-OS-UBUNTU-2204-CVE-2026-64600","UBUNTU-CVE-2026-64600"],"analysis":{"component_type":"kernel","fix_type":"patch","impacts":["data_read","data_modify"],"network_reachable":"adjacent_or_local","non_default_config":false,"product_category":"Linux kernel XFS","requires_auth":"low_privilege","summary":"A race condition in the Linux kernel XFS filesystem allows stale data fork mappings, potentially leading to incorrect data reads or writes during direct I/O operations.","user_interaction":"not_required","vuln_class":"race_condition"},"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-362","name":"Concurrent Execution using Shared Resource with Improper Synchronization"}],"description":"In the Linux kernel, the following vulnerability has been resolved:\n\nxfs: resample the data fork mapping after cycling ILOCK\n\nxfs_reflink_fill_{cow_hole,delalloc} are both presented with an inode,\na data fork mapping, and a cow fork mapping.  Unfortunately, these two\nhelpers cycle the ILOCK to grab a transaction, which means that the\nmappings are stale as soon as we reacquire the ILOCK.  Currently we\nrefresh the cow fork mapping by re-calling xfs_find_trim_cow_extent, but\nwe don't refresh the data fork mapping beforehand, which means that the\nxfs_bmap_trim_cow in that function queries the refcount btree about the\nwrong physical blocks and returns an inaccurate value in *shared.\n\nIf *shared is now false, the directio write proceeds with a stale data\nfork mapping.  Fix this by querying the data fork mapping if the\nsequence counter changes across the ILOCK cycle.","ecosystems":["Red Hat:enterprise_linux:10.2","Red Hat:enterprise_linux:8::baseos","Red Hat:enterprise_linux:9::appstream","Red Hat:enterprise_linux:9::baseos","Red Hat:enterprise_linux:9::crb","Red Hat:enterprise_linux:9::nfv","Red Hat:enterprise_linux:9::realtime","Red Hat:enterprise_linux_nvidia:10::el10","Red Hat:rhel_aus:8.6::baseos","Red Hat:rhel_e4s:8.8::baseos","Red Hat:rhel_e4s:9.2::appstream","Red Hat:rhel_e4s:9.2::baseos","Red Hat:rhel_e4s:9.4::baseos","Red Hat:rhel_eus:9.6::baseos","Red Hat:rhel_eus_long_life:8.6::baseos"],"exploits":{"exploitdb":0,"first_seen":"2026-07-22","github_poc":10,"max_poc_stars":22,"metasploit":0,"nuclei":0,"refs":[{"date":"2026-07-22T20:55:41Z","kind":"github_poc","ref":"https://github.com/0xredash/CVE-2026-64600","stars":22,"title":"CVE-2026-64600"},{"date":"2026-07-26T12:22:52Z","kind":"github_poc","ref":"https://github.com/Debajyoti0-0/CVE-2026-64600","stars":7,"title":"A C-based Linux security utility for detecting, safely verifying (Proof of Concept), and mitigating CVE-2026-64600 (RefluXFS). It provides kernel vulnerability assessment, XFS reflink detection, a safe race-condition PoC, and layered mitigation using SystemTap and XFS hardening."},{"date":"2026-07-27T06:42:58Z","kind":"github_poc","ref":"https://github.com/litosmartin/CVE-2026-64600-Refluxfs-PoC","stars":4,"title":"A POC for the recently discovered Qualys bug on COW with XFS"},{"date":"2026-08-08T15:18:19Z","kind":"github_poc","ref":"https://github.com/masrikky/CVE-2026-64600-RefluXFS","stars":1,"title":"A Linux kernel local privilege escalation affecting the XFS filesystem copy-on-write (CoW) path."},{"date":"2026-07-23T09:29:14Z","kind":"github_poc","ref":"https://github.com/HORKimhab/CVE-2026-64600","stars":0,"title":"CVE-2026-64600 - Draft - Check todo"},{"date":"2026-07-24T23:27:22Z","kind":"github_poc","ref":"https://github.com/vulnquest58/VQ-RefluxCore","stars":0,"title":"is an advanced security research framework designed to model, analyze, and demonstrate Local Privilege Escalation (LPE) mechanics associated with kernel-level race conditions and filesystem structure vulnerabilities (CVE-2026-64600 / RefluXFS)"},{"date":"2026-07-28T09:35:50Z","kind":"github_poc","ref":"https://github.com/bha-vin/CVE-2026-64600-Exploit","stars":0,"title":null},{"date":"2026-07-28T10:18:17Z","kind":"github_poc","ref":"https://github.com/letsr00t/RefluxFS_CVE-2026-64600","stars":0,"title":null}],"tier":"poc_unverified"},"has_fix":true,"headline":"xfs: resample the data fork mapping after cycling ILOCK","id":"CVE-2026-64600","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":null,"product":"linux:linux_kernel","products":["linux:linux_kernel"],"type":"race_condition","year":"2026"},"n_packages":404,"n_references":8,"next":{"headline":"ALSA: us144mkii: capture_urb_complete: redundant usb_anchor_urb corrupts anchor list on each resubmission","id":"CVE-2026-64601"},"packages":[{"ecosystem":"Red Hat:enterprise_linux:10.2","fixed":["0:1-5.el10_2"],"introduced":["0"],"last_affected":[],"package":"kpatch-patch-6_12_0-211_16_1","purl":"pkg:rpm/redhat/kpatch-patch-6_12_0-211_16_1","source":"RHSA-2026:46951"},{"ecosystem":"Red Hat:enterprise_linux:10.2","fixed":["0:1-5.el10_2"],"introduced":["0"],"last_affected":[],"package":"kpatch-patch-6_12_0-211_16_1-debuginfo","purl":"pkg:rpm/redhat/kpatch-patch-6_12_0-211_16_1-debuginfo","source":"RHSA-2026:46951"},{"ecosystem":"Red Hat:enterprise_linux:10.2","fixed":["0:1-5.el10_2"],"introduced":["0"],"last_affected":[],"package":"kpatch-patch-6_12_0-211_16_1-debugsource","purl":"pkg:rpm/redhat/kpatch-patch-6_12_0-211_16_1-debugsource","source":"RHSA-2026:46951"},{"ecosystem":"Red Hat:enterprise_linux:8::baseos","fixed":["0:1-8.el8_10"],"introduced":["0"],"last_affected":[],"package":"kpatch-patch-4_18_0-553_109_1","purl":"pkg:rpm/redhat/kpatch-patch-4_18_0-553_109_1","source":"RHSA-2026:47998"},{"ecosystem":"Red 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Hat:enterprise_linux:8::baseos","fixed":["0:1-15.el8_10"],"introduced":["0"],"last_affected":[],"package":"kpatch-patch-4_18_0-553_53_1-debuginfo","purl":"pkg:rpm/redhat/kpatch-patch-4_18_0-553_53_1-debuginfo","source":"RHSA-2026:47998"},{"ecosystem":"Red Hat:enterprise_linux:8::baseos","fixed":["0:1-15.el8_10"],"introduced":["0"],"last_affected":[],"package":"kpatch-patch-4_18_0-553_53_1-debugsource","purl":"pkg:rpm/redhat/kpatch-patch-4_18_0-553_53_1-debugsource","source":"RHSA-2026:47998"},{"ecosystem":"Red Hat:enterprise_linux:8::baseos","fixed":["0:1-12.el8_10"],"introduced":["0"],"last_affected":[],"package":"kpatch-patch-4_18_0-553_72_1","purl":"pkg:rpm/redhat/kpatch-patch-4_18_0-553_72_1","source":"RHSA-2026:47998"},{"ecosystem":"Red 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Hat:enterprise_linux:9::appstream","fixed":["0:5.14.0-687.26.1.el9_8"],"introduced":["0"],"last_affected":[],"package":"kernel-tools-debuginfo","purl":"pkg:rpm/redhat/kernel-tools-debuginfo","source":"RHBA-2026:39332"}],"prev":{"headline":"crypto: amlogic - avoid double cleanup in meson_crypto_probe()","id":"CVE-2026-64599"},"products":["Linux"],"published":"2026-07-23","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":"CC BY 4.0","name":"Red Hat","prefix":"RHBA"},{"class":"attribution","licence":"CC BY 4.0","name":"Red Hat","prefix":"RHSA"},{"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)"},{"class":"open","licence":"CC0","name":"PoC-in-GitHub"}],"ssvc":{"automatable":"no","exploitation":"none","technical_impact":"total"},"state":"PUBLISHED","updated":"2026-10-19","vendors":["Linux"]},"summary":"A race condition in the Linux kernel XFS filesystem allows stale data fork mappings, potentially leading to incorrect data reads or writes during direct I/O operations.","url":"https://insights.sbomify.com/CVE-2026-64600/"}