{"id":"CVE-2026-93228","aliases":[],"cve":{"records":[{"id":"CVE-2026-93228","source":"Linux","state":"PUBLISHED","reasons":[],"replacements":[],"disputed":false,"unsupportedWhenAssigned":false,"reserved":"2026-09-17T16:02:15.094Z","published":"2026-09-24T15:29:10.087Z","modified":"2026-10-30T12:36:26.967Z"}],"publishers":[{"name":"Linux","role":"CNA","organizationId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","modified":"2026-10-30T12:36:26.967Z"}],"references":[{"url":"https://git.kernel.org/stable/c/ac730b8cbaeec6831116e1455d909ecbdcdcbd34","tags":[],"source":"Linux"},{"url":"https://git.kernel.org/stable/c/28c5a3a572f6cf81ac304459cfd515480995d62a","tags":[],"source":"Linux"},{"url":"https://git.kernel.org/stable/c/fe533ae1bed2ef2b3d54ee7ab410da1874ed3d4f","tags":[],"source":"Linux"},{"url":"https://git.kernel.org/stable/c/a798714b58041e88716db3bf8fb03ae13eecd54a","tags":[],"source":"Linux"},{"url":"https://git.kernel.org/stable/c/45dbdb2637b7fc5f1355b588780d2a7fb0516805","tags":[],"source":"Linux"},{"url":"https://git.kernel.org/stable/c/9808eb7656666acc7291bae9ab6b987bd16e47e0","tags":[],"source":"Linux"}],"weaknesses":[],"applicability":[{"source":"Linux","statements":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.11","versionEndExcluding":"6.1.191"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.11","versionEndExcluding":"6.6.160"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.11","versionEndExcluding":"6.12.111"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.11","versionEndExcluding":"6.18.50"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.11","versionEndExcluding":"7.2.4"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.11","versionEndExcluding":"7.3"}]}]}]}],"prioritization":[]},"title":"svcrdma: Reject Write/Reply chunks with segcount 0","titleSource":"Linux","descriptionSource":"Linux","description":"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.","score":9.1,"severity":"critical","published":"2026-09-24T15:29:10.087Z","modified":"2026-10-30T12:36:26.967Z","withdrawn":false,"knownExploited":false,"affected":[],"products":[{"vendor":"Linux","name":"Linux","platforms":[],"versions":[{"version":"78147ca8b4a9b6cf0e597ddd6bf17959e08376c2","status":"affected","lessThan":"ac730b8cbaeec6831116e1455d909ecbdcdcbd34","versionType":"git"},{"version":"78147ca8b4a9b6cf0e597ddd6bf17959e08376c2","status":"affected","lessThan":"28c5a3a572f6cf81ac304459cfd515480995d62a","versionType":"git"},{"version":"78147ca8b4a9b6cf0e597ddd6bf17959e08376c2","status":"affected","lessThan":"fe533ae1bed2ef2b3d54ee7ab410da1874ed3d4f","versionType":"git"},{"version":"78147ca8b4a9b6cf0e597ddd6bf17959e08376c2","status":"affected","lessThan":"a798714b58041e88716db3bf8fb03ae13eecd54a","versionType":"git"},{"version":"78147ca8b4a9b6cf0e597ddd6bf17959e08376c2","status":"affected","lessThan":"45dbdb2637b7fc5f1355b588780d2a7fb0516805","versionType":"git"},{"version":"78147ca8b4a9b6cf0e597ddd6bf17959e08376c2","status":"affected","lessThan":"9808eb7656666acc7291bae9ab6b987bd16e47e0","versionType":"git"}],"defaultStatus":"unaffected","cpes":[],"source":"Linux","url":"https://www.cve.org/CVERecord?id=CVE-2026-93228"},{"vendor":"Linux","name":"Linux","platforms":[],"versions":[{"version":"5.11","status":"affected"},{"version":"0","status":"unaffected","lessThan":"5.11","versionType":"semver"},{"version":"6.1.191","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.160","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.111","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.50","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.2.4","status":"unaffected","lessThanOrEqual":"7.2.*","versionType":"semver"},{"version":"7.3","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"defaultStatus":"affected","cpes":[],"source":"Linux","url":"https://www.cve.org/CVERecord?id=CVE-2026-93228"}],"remediation":[],"references":["https://git.kernel.org/stable/c/ac730b8cbaeec6831116e1455d909ecbdcdcbd34","https://git.kernel.org/stable/c/28c5a3a572f6cf81ac304459cfd515480995d62a","https://git.kernel.org/stable/c/fe533ae1bed2ef2b3d54ee7ab410da1874ed3d4f","https://git.kernel.org/stable/c/a798714b58041e88716db3bf8fb03ae13eecd54a","https://git.kernel.org/stable/c/45dbdb2637b7fc5f1355b588780d2a7fb0516805","https://git.kernel.org/stable/c/9808eb7656666acc7291bae9ab6b987bd16e47e0"],"sources":[{"name":"CVE","id":"CVE-2026-93228","modified":"2026-10-30T12:36:26.967Z","url":"https://www.cve.org/CVERecord?id=CVE-2026-93228"}],"assessments":[{"source":"Linux","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H","score":9.1}],"sourceAffected":[],"observedAt":"2026-10-30T13:55:40.820Z","kev":{"status":"not-listed","checkedAt":"2026-11-14T22:40:32.870Z"},"coverage":[{"source":"NVD","status":"not-checked"},{"source":"GHSA","status":"not-checked"},{"source":"EUVD","status":"not-checked"},{"source":"EPSS","status":"not-checked"}],"evidence":[],"aiSummary":null}