{
  "cveId": "CVE-2026-89533",
  "url": "https://patchblox.com/security/cve/CVE-2026-89533",
  "summary": "CVE-2026-89533 is fixed in 53 products on 1 platform, first by DEBIAN-CVE-2026-89533, released September 23, 2026. It is not reported as exploited. Patch Radar priority: Urgent.",
  "title": "linux: In the Linux kernel, the following vulnerability has been resolved:  svcrdma: Fix offset arithmetic in read_chunk_ran...",
  "description": "In the Linux kernel, the following vulnerability has been resolved:  svcrdma: Fix offset arithmetic in read_chunk_range  svc_rdma_read_chunk_range() walks a Read chunk\u0027s segment list to build a sub-range starting at byte offset and spanning length bytes for a Position-Zero or Call chunk. Two arithmetic defects in the per-segment loop produce wrong DMA lengths and a u32 underflow:      pcl_for_each_segment(segment, chunk) {             if (offset \u003E segment-\u003Ers_length) {                     offset -= segment-\u003Ers_length;                     continue;             }              dummy.rs_handle = segment-\u003Ers_handle;             dummy.rs_length = min_t(u32, length,                                     segment-\u003Ers_length) - offset;             dummy.rs_offset = segment-\u003Ers_offset \u002B offset;  First, the skip predicate uses \u0027\u003E\u0027 instead of \u0027\u003E=\u0027. When offset equals the segment\u0027s full rs_length, the segment is fully consumed and should be skipped, but the loop falls through into the body. The resulting dummy.rs_length is min_t(u32, length, rs_length) - rs_length, which underflows to a near-UINT_MAX u32 when length is smaller than rs_length, or is zero otherwise.  Second, the length formula subtracts offset from the min_t() result rather than from segment-\u003Ers_length before the cap. For offset \u003E 0 the segment\u0027s residual is rs_length - offset, not rs_length, so the cap must be applied to the residual. With the current bracketing, whenever length is smaller than rs_length - offset the per-segment length becomes length - offset instead of length, silently dropping offset bytes from the rebuilt chunk. Combined with the boundary case above it also enables the u32 underflow path, which propagates a huge nr_bvec into svc_rdma_build_read_segment() and a multi-MiB kmalloc_array_node() in svc_rdma_get_rw_ctxt().  Additionally, svc_rdma_read_call_chunk() can invoke this function with length == 0 when the last Read chunk ends exactly at the end of the Call chunk. With the corrected \u003E= predicate, every segment is skipped and the function returns the initial -EINVAL, rejecting a valid request. Return success immediately when length is zero. Also break out of the loop once length is fully consumed to avoid passing zero-length segments to svc_rdma_build_read_segment().  Fix by using \u0027\u003E=\u0027 so a fully-consumed segment is skipped, by moving \u0027- offset\u0027 inside min_t() so the cap is applied to the segment\u0027s residual length, by returning success for zero-length requests, and by stopping iteration when the requested range has been consumed.",
  "published": "2026-09-11T20:19:36Z",
  "severity": "critical",
  "cvss": 9.8,
  "cvssVector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
  "epss": 0.00502,
  "epssPercentile": 0.4326,
  "priority": "Urgent",
  "priorityTier": 2,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
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