{"answers":{"affected":"","exploited":"There is no known exploitation of CVE-2026-89633 in the wild and no public exploit code.","fix":"Apply the vendor's patch.","what":"CVE-2026-89633 is a critical memory corruption vulnerability in Linux, published on 11 Sep 2026. An attacker can exploit it over the internet without logging in, with no action from the victim."},"fix_prompt":"Check this codebase for CVE-2026-89633 and fix it if it is affected.\n\nWhat it is: CVE-2026-89633 is a critical memory corruption vulnerability in Linux, published on 11 Sep 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.\nExploitation: There is no known exploitation of CVE-2026-89633 in the wild and no public exploit code.\n\nAffected product: 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-2026-89633/ (Markdown: https://insights.sbomify.com/CVE-2026-89633/index.md)","id":"CVE-2026-89633","markdown":"https://insights.sbomify.com/CVE-2026-89633/index.md","name":"CVE-2026-89633","record":{"aliases":["AZL-100592","BELL-CVE-2026-89633","DEBIAN-CVE-2026-89633","GHSA-6jcv-m8xc-577h","UBUNTU-CVE-2026-89633"],"analysis":{"component_type":"kernel","fix_type":"patch","impacts":["code_execution","denial_of_service"],"network_reachable":"yes","non_default_config":false,"product_category":"Linux kernel SMB client","requires_auth":"none","summary":"A missing bounds check in the Linux kernel SMB client allows remote attackers to trigger out-of-bounds memory reads and writes, potentially leading to code execution or system crashes.","user_interaction":"not_required","vuln_class":"memory_corruption"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"Linux","cpe":[],"cvss":{"score":9.8,"severity":"critical","source":"cna","vector":"CVSS:3.1/AV:N/AC:L/PR:N/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\nsmb: client: fix OOB read/write from unvalidated DataOffset in coalesce_t2()\n\ncoalesce_t2() computes data pointers directly from server-supplied\nDataOffset fields with no validation against buffer bounds:\n\n  data_area_of_tgt = (char *)\u0026pSMBt-\u003ehdr.Protocol +\n                     get_unaligned_le16(\u0026pSMBt-\u003et2_rsp.DataOffset);\n  data_area_of_src = (char *)\u0026pSMBs-\u003ehdr.Protocol +\n                     get_unaligned_le16(\u0026pSMBs-\u003et2_rsp.DataOffset);\n  data_area_of_tgt += total_in_tgt;\n  ...\n  memcpy(data_area_of_tgt, data_area_of_src, total_in_src);\n\nA small DataOffset can push a pointer below the actual byte area,\noverwriting header fields; a large one can push it past the buffer\nend, causing out-of-bounds heap reads (source) or writes (target).\nThe BCC overflow guard does not prevent this: BCC reflects how much\ndata is present, while DataOffset controls where in the buffer it\nstarts.\n\nThe \"validate target area\" comment present since the function was\nfirst written in 2005 was a placeholder that was never implemented.\n\nAdd lower- and upper-bound checks for both data pointers before the\nmemcpy, and before any target header fields are modified.","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":"smb: client: fix OOB read/write from unvalidated DataOffset in coalesce_t2()","id":"CVE-2026-89633","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":null,"product":null,"products":[],"type":"memory_corruption","year":"2026"},"n_packages":0,"n_references":5,"next":{"headline":"smb: client: fix ALIGN() overflow in symlink_data() error context loop","id":"CVE-2026-89634"},"packages":[],"prev":{"headline":"smb: client: fix use-before-check of ReparseDataLength in reparse_buf_ptr()","id":"CVE-2026-89632"},"products":["Linux"],"published":"2026-09-11","related":[],"sources":[{"class":"attribution","licence":"CVE Terms of Use (MITRE)","name":"CVE List","prefix":"CVE"},{"class":"attribution","licence":"FIRST CVSS licence","name":"CVSS (FIRST)"}],"ssvc":{"automatable":null,"exploitation":null,"technical_impact":null},"state":"PUBLISHED","updated":"2026-10-21","vendors":["Linux"]},"summary":"A missing bounds check in the Linux kernel SMB client allows remote attackers to trigger out-of-bounds memory reads and writes, potentially leading to code execution or system crashes.","url":"https://insights.sbomify.com/CVE-2026-89633/"}