{"answers":{"affected":"","exploited":"There is no known exploitation of CVE-2026-68431 in the wild and no public exploit code.","fix":"Apply the vendor's patch.","what":"CVE-2026-68431 is a critical vulnerability in Linux, published on 12 Aug 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-2026-68431 and fix it if it is affected.\n\nWhat it is: CVE-2026-68431 is a critical vulnerability in Linux, published on 12 Aug 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-2026-68431 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-2026-68431/ (Markdown: https://insights.sbomify.com/CVE-2026-68431/index.md)","id":"CVE-2026-68431","markdown":"https://insights.sbomify.com/CVE-2026-68431/index.md","name":"CVE-2026-68431","record":{"aliases":["BELL-CVE-2026-68431","DEBIAN-CVE-2026-68431","GHSA-6pm5-g7cv-g948","UBUNTU-CVE-2026-68431"],"analysis":{"component_type":"kernel","fix_type":"patch","impacts":["data_read"],"network_reachable":"yes","non_default_config":false,"product_category":"Linux kernel SMB server","requires_auth":"none","summary":"An unauthenticated attacker can read memory beyond the request allocation by sending a short SMB2 transform packet to the ksmbd kernel module.","user_interaction":"not_required","vuln_class":"information_disclosure"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"Linux","cpe":[],"cvss":{"score":9.1,"severity":"critical","source":"cna","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H","version":"3.1"},"cwes":[],"description":"In the Linux kernel, the following vulnerability has been resolved:\n\nksmbd: validate minimum PDU size for transform requests\n\nThe receive path applies the minimum SMB2 PDU size check only when\nProtocolId is SMB2_PROTO_NUMBER. A packet carrying\nSMB2_TRANSFORM_PROTO_NUM bypasses the check even when the negotiated\ndialect does not provide transform handling.\n\nOn an SMB 2.1 connection, a short transform packet therefore reaches\ninit_smb2_rsp_hdr(), which interprets the request as a full SMB2 header\nand reads beyond the request allocation. The copied fields can then be\nreturned to the unauthenticated client.\n\nCompression transforms are converted to ordinary SMB2 messages before\nprotocol validation. After that conversion, validate ordinary SMB2\nrequests against SMB2_MIN_SUPPORTED_PDU_SIZE and require encryption\ntransform requests to contain both a transform header and an SMB2\nheader. This rejects truncated requests before work allocation.","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":"ksmbd: validate minimum PDU size for transform requests","id":"CVE-2026-68431","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":null,"product":null,"products":[],"type":"information_disclosure","year":"2026"},"n_packages":0,"n_references":7,"next":{"headline":"vxlan: require CAP_NET_ADMIN in the device netns for changelink","id":"CVE-2026-68432"},"packages":[],"prev":{"headline":"drm/amdgpu/gfx8: drop unecessary BUG_ON()","id":"CVE-2026-68430"},"products":["Linux"],"published":"2026-08-12","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":"2026-08-23","vendors":["Linux"]},"summary":"An unauthenticated attacker can read memory beyond the request allocation by sending a short SMB2 transform packet to the ksmbd kernel module.","url":"https://insights.sbomify.com/CVE-2026-68431/"}