{"schema":"threatline.record/2","record":{"id":"CVE-2026-93228","aliases":[],"summary":"svcrdma: Reject Write/Reply chunks with segcount 0","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nsvcrdma: Reject Write/Reply chunks with segcount 0\n\nA peer can send a Write or Reply chunk whose segcount field is zero.\nxdr_check_write_chunk() only rejects segcount > rc_maxpages, so zero\npasses the range check, and xdr_inline_decode(stream, 0) returns the\ncurrent (non-NULL) cursor without advancing. The function returns\ntrue and pcl_alloc_write() then links a struct svc_rdma_chunk with\nch_segcount == 0 onto rc_write_pcl or rc_reply_pcl.\n\nAn earlier patch in this series made pcl_for_each_segment() safe for\nch_segcount == 0, so this no longer drives the memory walk it used\nto. Rejecting the malformed frame at the decode boundary is still\nworthwhile as defense in depth: it keeps degenerate zero-segment\nchunks off the parsed chunk lists entirely, so any future consumer\nthat walks ch_segments directly cannot observe one, and it makes the\nzero-floor easy to backport to trees where the macro change is more\nintrusive. RFC 8166 has no meaning for a Write/Reply chunk that\ndescribes no remote buffer, so no legitimate client is affected.\n\nxdr_check_reply_chunk() funnels Reply chunks through\nxdr_check_write_chunk() and inherits the same rejection.\n\npcl_alloc_write() also links each chunk onto the parsed chunk list\nbefore filling its segment array. If a future change weakens the\nsegcount-0 rejection, an incomplete chunk is visible to consumers\nduring the fill loop. Reorder so that list_add_tail() follows the\nsegment fill loop, ensuring only fully-populated chunks appear on\nthe list.","categories":["Operating systems"],"product":"Linux","vendor":"Linux","ecosystem":null,"affected_ranges":[{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-93228","source_modified_at":"2026-10-21T12:52:23.995Z","fetched_at":"2026-10-23T18:45:31.882637Z","product":"Linux","vendor":"Linux","versions":[{"version":"78147ca8b4a9b6cf0e597ddd6bf17959e08376c2","lessThan":"28c5a3a572f6cf81ac304459cfd515480995d62a","status":"affected","versionType":"git"},{"version":"78147ca8b4a9b6cf0e597ddd6bf17959e08376c2","lessThan":"fe533ae1bed2ef2b3d54ee7ab410da1874ed3d4f","status":"affected","versionType":"git"},{"version":"78147ca8b4a9b6cf0e597ddd6bf17959e08376c2","lessThan":"a798714b58041e88716db3bf8fb03ae13eecd54a","status":"affected","versionType":"git"},{"version":"78147ca8b4a9b6cf0e597ddd6bf17959e08376c2","lessThan":"45dbdb2637b7fc5f1355b588780d2a7fb0516805","status":"affected","versionType":"git"},{"version":"78147ca8b4a9b6cf0e597ddd6bf17959e08376c2","lessThan":"9808eb7656666acc7291bae9ab6b987bd16e47e0","status":"affected","versionType":"git"}],"defaultStatus":"unaffected"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-93228","source_modified_at":"2026-10-21T12:52:23.995Z","fetched_at":"2026-10-23T18:45:31.882637Z","product":"Linux","vendor":"Linux","versions":[{"version":"5.11","status":"affected"},{"version":"0","lessThan":"5.11","status":"unaffected","versionType":"semver"},{"version":"6.6.160","lessThanOrEqual":"6.6.*","status":"unaffected","versionType":"semver"},{"version":"6.12.111","lessThanOrEqual":"6.12.*","status":"unaffected","versionType":"semver"},{"version":"6.18.50","lessThanOrEqual":"6.18.*","status":"unaffected","versionType":"semver"},{"version":"7.2.4","lessThanOrEqual":"7.2.*","status":"unaffected","versionType":"semver"},{"version":"7.3","lessThanOrEqual":"*","status":"unaffected","versionType":"original_commit_for_fix"}],"defaultStatus":"affected"}],"fixed_versions":[{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-93228","source_modified_at":"2026-10-21T12:52:23.995Z","fetched_at":"2026-10-23T18:45:31.882637Z","package":{"name":"Linux","ecosystem":null},"version":"28c5a3a572f6cf81ac304459cfd515480995d62a","basis":"first unaffected version stated in the CVE record"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-93228","source_modified_at":"2026-10-21T12:52:23.995Z","fetched_at":"2026-10-23T18:45:31.882637Z","package":{"name":"Linux","ecosystem":null},"version":"45dbdb2637b7fc5f1355b588780d2a7fb0516805","basis":"first unaffected version stated in the CVE record"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-93228","source_modified_at":"2026-10-21T12:52:23.995Z","fetched_at":"2026-10-23T18:45:31.882637Z","package":{"name":"Linux","ecosystem":null},"version":"9808eb7656666acc7291bae9ab6b987bd16e47e0","basis":"first unaffected version stated in the CVE record"}],"cvss":9.1,"severity":"Critical","kev":{"listed":false},"epss":{"probability":0.00473,"percentile":0.39957,"score_date":"2026-10-23"},"published_at":"2026-09-24T15:29:10.087Z","modified_at":"2026-10-21T12:52:23.995Z","provenance":[{"source":"CVE List","url":"https://www.cve.org/CVERecord?id=CVE-2026-93228","fetched_at":"2026-10-23T18:45:31.882637Z","source_modified_at":"2026-10-21T12:52:23.995Z"},{"source":"EPSS","url":"https://api.first.org/data/v1/epss?cve=CVE-2026-93228","fetched_at":"2026-10-23T18:42:43.628194Z","source_modified_at":"2026-10-23"}],"sources":["CVE List","EPSS"],"references":[{"source":"CVE List","url":"https://git.kernel.org/stable/c/28c5a3a572f6cf81ac304459cfd515480995d62a"},{"source":"CVE List","url":"https://git.kernel.org/stable/c/fe533ae1bed2ef2b3d54ee7ab410da1874ed3d4f"},{"source":"CVE List","url":"https://git.kernel.org/stable/c/a798714b58041e88716db3bf8fb03ae13eecd54a"},{"source":"CVE List","url":"https://git.kernel.org/stable/c/45dbdb2637b7fc5f1355b588780d2a7fb0516805"},{"source":"CVE List","url":"https://git.kernel.org/stable/c/9808eb7656666acc7291bae9ab6b987bd16e47e0"}],"locations":[],"motoko_assessment":{"status":"requires_architecture_review","automatic_remediation":false},"cve_state":"PUBLISHED","cvss_source":"CVE List","classification":{"method":"product-first software-layer rules","rules_version":"2.1","matched_on":"product","confidence":"heuristic","reviewed":false},"change_timestamp":"2026-10-21T12:52:23.995Z","content_hash":"8957917a4f54445c7c09987b829ecf4b25f39503900421b6578948de37211f25"}}