{
  "cveId": "CVE-2026-89532",
  "url": "https://patchblox.com/security/cve/CVE-2026-89532",
  "summary": "CVE-2026-89532 is fixed in 53 products on 1 platform, first by DEBIAN-CVE-2026-89532, released September 23, 2026. It is not reported as exploited. Patch Radar priority: High.",
  "title": "svcrdma: Fix pcl_for_each_segment for empty chunks",
  "description": "In the Linux kernel, the following vulnerability has been resolved:  svcrdma: Fix pcl_for_each_segment for empty chunks  When a parsed chunk list contains a chunk whose ch_segcount is zero, pcl_for_each_segment computes its inclusive upper bound as \u0026chunk-\u003Ech_segments[ch_segcount - 1]. ch_segcount is u32, so the subtraction wraps to 0xFFFFFFFF and the bound lands far past the ch_segments flex array. The loop body then walks unrelated memory at sizeof(struct svc_rdma_segment) stride until it faults.  A zero-segcount chunk is reachable from the wire: xdr_check_write_chunk() only rejects segcount values greater than rc_maxpages, and pcl_alloc_write() links a freshly allocated chunk onto rc_write_pcl/rc_reply_pcl before its segment-fill loop runs, so a Write or Reply chunk advertising zero segments leaves ch_segcount == 0 on the list. When the transport has negotiated Send-With-Invalidate, svc_rdma_get_inv_rkey() iterates all four PCLs with pcl_for_each_segment and dereferences segment-\u003Ers_handle on each iteration, turning the underflow into an out-of-bounds read and a general protection fault.      xdr_check_write_list / xdr_check_reply_chunk       pcl_alloc_write()         chunk = pcl_alloc_chunk(...)  /* ch_segcount = 0 */         list_add_tail(\u0026chunk-\u003Ech_list, \u0026pcl-\u003Ecl_chunks)         /* fill loop iterates zero times for wire segcount 0 */      svc_rdma_get_inv_rkey()       pcl_for_each_chunk(rc_write_pcl)         pcl_for_each_segment(segment, chunk)           pos \u003C= \u0026ch_segments[0u - 1u]  /* 0xFFFFFFFF */           segment-\u003Ers_handle            /* OOB read -\u003E GPF */  Fix by switching the macro to a half-open upper bound that uses ch_segcount directly. For ch_segcount == 0 the loop start equals the loop end and the body is skipped; for ch_segcount \u003E 0 the iteration range is unchanged. All six existing call sites in net/sunrpc/xprtrdma/svc_rdma_recvfrom.c and net/sunrpc/xprtrdma/svc_rdma_rw.c remain correct under the new bound, so no caller changes are needed.",
  "published": "2026-09-11T20:19:36Z",
  "severity": "Important",
  "cvss": 9.1,
  "cvssVector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H",
  "epss": 0.00502,
  "epssPercentile": 0.4326,
  "priority": "High",
  "priorityTier": 3,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "vendorAdvisory": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-89532",
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  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
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}