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CVE-2026-89533 (GCVE-0-2026-89533)

Vulnerability from cvelistv5 – Published: 2026-09-11 19:44 – Updated: 2026-09-14 12:00
VLAI
Title
svcrdma: Fix offset arithmetic in read_chunk_range
Summary
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's 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 > segment->rs_length) { offset -= segment->rs_length; continue; } dummy.rs_handle = segment->rs_handle; dummy.rs_length = min_t(u32, length, segment->rs_length) - offset; dummy.rs_offset = segment->rs_offset + offset; First, the skip predicate uses '>' instead of '>='. When offset equals the segment's 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->rs_length before the cap. For offset > 0 the segment's 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 >= 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 '>=' so a fully-consumed segment is skipped, by moving '- offset' inside min_t() so the cap is applied to the segment's residual length, by returning success for zero-length requests, and by stopping iteration when the requested range has been consumed.
Severity
9.8 (Critical)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: d7cc73972661be4a02a1b09f1d9b3283c6c05154 , < 10873311f91db9454e2fadbf9866bc819e0646d9 (git)
Affected: d7cc73972661be4a02a1b09f1d9b3283c6c05154 , < addbf02dfe3b25e7e38e03bbd4e2a6ed86a14be7 (git)
Affected: d7cc73972661be4a02a1b09f1d9b3283c6c05154 , < cba8543c18cf42fd80fd63effb6df6ff4f7e73ce (git)
Affected: d7cc73972661be4a02a1b09f1d9b3283c6c05154 , < 6ee4dc7476b3abc92ec1d444533a559f33f59561 (git)
Affected: d7cc73972661be4a02a1b09f1d9b3283c6c05154 , < a46b35f213c2426f5d6a0458a8f7e873fc59cdfd (git)
Affected: d7cc73972661be4a02a1b09f1d9b3283c6c05154 , < 4493c96bbd0068fadf69cbae8d13426202e34cdc (git)
Affected: d7cc73972661be4a02a1b09f1d9b3283c6c05154 , < 4a44c140cc2f3643a39e258bb0c0ab9d0f494f5e (git)
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Linux Linux Affected: 5.11
Unaffected: 0 , < 5.11 (semver)
Unaffected: 5.15.221 , ≤ 5.15.* (semver)
Unaffected: 6.1.188 , ≤ 6.1.* (semver)
Unaffected: 6.6.157 , ≤ 6.6.* (semver)
Unaffected: 6.12.109 , ≤ 6.12.* (semver)
Unaffected: 6.18.50 , ≤ 6.18.* (semver)
Unaffected: 7.2.4 , ≤ 7.2.* (semver)
Unaffected: 7.3-rc1 , ≤ * (original_commit_for_fix)
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          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nsvcrdma: Fix offset arithmetic in read_chunk_range\n\nsvc_rdma_read_chunk_range() walks a Read chunk\u0027s segment list to\nbuild a sub-range starting at byte offset and spanning length bytes\nfor a Position-Zero or Call chunk. Two arithmetic defects in the\nper-segment loop produce wrong DMA lengths and a u32 underflow:\n\n    pcl_for_each_segment(segment, chunk) {\n            if (offset \u003e segment-\u003ers_length) {\n                    offset -= segment-\u003ers_length;\n                    continue;\n            }\n\n            dummy.rs_handle = segment-\u003ers_handle;\n            dummy.rs_length = min_t(u32, length,\n                                    segment-\u003ers_length) - offset;\n            dummy.rs_offset = segment-\u003ers_offset + offset;\n\nFirst, the skip predicate uses \u0027\u003e\u0027 instead of \u0027\u003e=\u0027. When offset\nequals the segment\u0027s full rs_length, the segment is fully consumed\nand should be skipped, but the loop falls through into the body.\nThe resulting dummy.rs_length is min_t(u32, length, rs_length) -\nrs_length, which underflows to a near-UINT_MAX u32 when length is\nsmaller than rs_length, or is zero otherwise.\n\nSecond, the length formula subtracts offset from the min_t() result\nrather than from segment-\u003ers_length before the cap. For offset \u003e 0\nthe segment\u0027s residual is rs_length - offset, not rs_length, so the\ncap must be applied to the residual. With the current bracketing,\nwhenever length is smaller than rs_length - offset the per-segment\nlength becomes length - offset instead of length, silently dropping\noffset bytes from the rebuilt chunk. Combined with the boundary\ncase above it also enables the u32 underflow path, which propagates\na huge nr_bvec into svc_rdma_build_read_segment() and a multi-MiB\nkmalloc_array_node() in svc_rdma_get_rw_ctxt().\n\nAdditionally, svc_rdma_read_call_chunk() can invoke this function\nwith length == 0 when the last Read chunk ends exactly at the end\nof the Call chunk. With the corrected \u003e= predicate, every segment\nis skipped and the function returns the initial -EINVAL, rejecting\na valid request. Return success immediately when length is zero.\nAlso break out of the loop once length is fully consumed to avoid\npassing zero-length segments to svc_rdma_build_read_segment().\n\nFix by using \u0027\u003e=\u0027 so a fully-consumed segment is skipped, by\nmoving \u0027- offset\u0027 inside min_t() so the cap is applied to the\nsegment\u0027s residual length, by returning success for zero-length\nrequests, and by stopping iteration when the requested range has\nbeen consumed."
        }
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        {
          "cvssV3_1": {
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            "baseSeverity": "CRITICAL",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
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              "lang": "en",
              "value": "AV:N - svcrdma is nfsd\u0027s RPC-over-RDMA server transport; a remote peer reaches svc_rdma_read_chunk_range() by sending a Call with a Position-Zero/Call chunk and Read list over routable iWARP or RoCEv2, matching prior kernel CNA scores for this subsystem.\nAC:L - The attacker fully controls Call-chunk segment lengths and Read-chunk positions and can place a Read chunk on a segment boundary with a smaller remaining range so dummy.rs_length underflows a u32 deterministically, with no race or uncontrollable layout.\nPR:N - svc_rdma_process_read_list() runs in svc_rdma_recvfrom() while assembling the transport message, before svc_process() performs RPC or NFS authentication, and RDMA CM accept has no credential check.\nUI:N - Sending a crafted RPC-over-RDMA message with a malicious Call chunk and Read list to an already-listening NFS/RDMA service is sufficient; no victim mount, click, or other user action is required.\nS:U - The vulnerable NFS/RDMA service and affected kernel memory belong to the same host kernel security authority; this is not a VM, IOMMU, or sandbox escape.\nC:H - The underflowed length is added to rc_readbytes and, when Reads complete, svc_rdma_read_complete_pzrc() sets xdr_buf.page_len to a near-4GiB value, so XDR walks far past the rq_pages allocation and reads adjacent kernel heap as page pointers.\nI:H - XDR helpers such as xdr_buf_pages_zero() kmap and memset through that inflated page_len, writing via out-of-bounds page pointers taken from adjacent slab, a kernel integrity and control-flow hijack primitive.\nA:H - On the scatterlist path PAGE_ALIGN wrapping to 0 hits sg_alloc_table_chained(0) which BUG_ON(!nents) and panics; the huge page_len walk oopses on invalid pages, and an unauthenticated peer can repeat this per request."
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        "dateUpdated": "2026-09-14T12:00:43.968Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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        {
          "url": "https://git.kernel.org/stable/c/10873311f91db9454e2fadbf9866bc819e0646d9"
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          "url": "https://git.kernel.org/stable/c/addbf02dfe3b25e7e38e03bbd4e2a6ed86a14be7"
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        {
          "url": "https://git.kernel.org/stable/c/a46b35f213c2426f5d6a0458a8f7e873fc59cdfd"
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        {
          "url": "https://git.kernel.org/stable/c/4493c96bbd0068fadf69cbae8d13426202e34cdc"
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        {
          "url": "https://git.kernel.org/stable/c/4a44c140cc2f3643a39e258bb0c0ab9d0f494f5e"
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      ],
      "title": "svcrdma: Fix offset arithmetic in read_chunk_range",
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-89533",
    "datePublished": "2026-09-11T19:44:12.236Z",
    "dateReserved": "2026-09-11T19:38:34.720Z",
    "dateUpdated": "2026-09-14T12:00:43.968Z",
    "state": "PUBLISHED"
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      "percentile": "0.3887"
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    "nvd": "{\"cve\":{\"id\":\"CVE-2026-89533\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2026-09-11T20:19:36.250\",\"lastModified\":\"2026-09-14T13:19:08.560\",\"vulnStatus\":\"Received\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nsvcrdma: Fix offset arithmetic in read_chunk_range\\n\\nsvc_rdma_read_chunk_range() walks a Read chunk\u0027s segment list to\\nbuild a sub-range starting at byte offset and spanning length bytes\\nfor a Position-Zero or Call chunk. Two arithmetic defects in the\\nper-segment loop produce wrong DMA lengths and a u32 underflow:\\n\\n    pcl_for_each_segment(segment, chunk) {\\n            if (offset \u003e segment-\u003ers_length) {\\n                    offset -= segment-\u003ers_length;\\n                    continue;\\n            }\\n\\n            dummy.rs_handle = segment-\u003ers_handle;\\n            dummy.rs_length = min_t(u32, length,\\n                                    segment-\u003ers_length) - offset;\\n            dummy.rs_offset = segment-\u003ers_offset + offset;\\n\\nFirst, the skip predicate uses \u0027\u003e\u0027 instead of \u0027\u003e=\u0027. When offset\\nequals the segment\u0027s full rs_length, the segment is fully consumed\\nand should be skipped, but the loop falls through into the body.\\nThe resulting dummy.rs_length is min_t(u32, length, rs_length) -\\nrs_length, which underflows to a near-UINT_MAX u32 when length is\\nsmaller than rs_length, or is zero otherwise.\\n\\nSecond, the length formula subtracts offset from the min_t() result\\nrather than from segment-\u003ers_length before the cap. For offset \u003e 0\\nthe segment\u0027s residual is rs_length - offset, not rs_length, so the\\ncap must be applied to the residual. With the current bracketing,\\nwhenever length is smaller than rs_length - offset the per-segment\\nlength becomes length - offset instead of length, silently dropping\\noffset bytes from the rebuilt chunk. Combined with the boundary\\ncase above it also enables the u32 underflow path, which propagates\\na huge nr_bvec into svc_rdma_build_read_segment() and a multi-MiB\\nkmalloc_array_node() in svc_rdma_get_rw_ctxt().\\n\\nAdditionally, svc_rdma_read_call_chunk() can invoke this function\\nwith length == 0 when the last Read chunk ends exactly at the end\\nof the Call chunk. With the corrected \u003e= predicate, every segment\\nis skipped and the function returns the initial -EINVAL, rejecting\\na valid request. Return success immediately when length is zero.\\nAlso break out of the loop once length is fully consumed to avoid\\npassing zero-length segments to svc_rdma_build_read_segment().\\n\\nFix by using \u0027\u003e=\u0027 so a fully-consumed segment is skipped, by\\nmoving \u0027- offset\u0027 inside min_t() so the cap is applied to the\\nsegment\u0027s residual length, by returning success for zero-length\\nrequests, and by stopping iteration when the requested range has\\nbeen consumed.\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"net/sunrpc/xprtrdma/svc_rdma_rw.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"d7cc73972661be4a02a1b09f1d9b3283c6c05154\",\"lessThan\":\"10873311f91db9454e2fadbf9866bc819e0646d9\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"d7cc73972661be4a02a1b09f1d9b3283c6c05154\",\"lessThan\":\"addbf02dfe3b25e7e38e03bbd4e2a6ed86a14be7\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"d7cc73972661be4a02a1b09f1d9b3283c6c05154\",\"lessThan\":\"cba8543c18cf42fd80fd63effb6df6ff4f7e73ce\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"d7cc73972661be4a02a1b09f1d9b3283c6c05154\",\"lessThan\":\"6ee4dc7476b3abc92ec1d444533a559f33f59561\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"d7cc73972661be4a02a1b09f1d9b3283c6c05154\",\"lessThan\":\"a46b35f213c2426f5d6a0458a8f7e873fc59cdfd\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"d7cc73972661be4a02a1b09f1d9b3283c6c05154\",\"lessThan\":\"4493c96bbd0068fadf69cbae8d13426202e34cdc\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"d7cc73972661be4a02a1b09f1d9b3283c6c05154\",\"lessThan\":\"4a44c140cc2f3643a39e258bb0c0ab9d0f494f5e\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"net/sunrpc/xprtrdma/svc_rdma_rw.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"5.11\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"5.11\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.15.221\",\"lessThanOrEqual\":\"5.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.188\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.157\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.109\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.50\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.2.4\",\"lessThanOrEqual\":\"7.2.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.3-rc1\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H\",\"baseScore\":9.8,\"baseSeverity\":\"CRITICAL\",\"attackVector\":\"NETWORK\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"NONE\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"HIGH\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":3.9,\"impactScore\":5.9}]},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/10873311f91db9454e2fadbf9866bc819e0646d9\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/4493c96bbd0068fadf69cbae8d13426202e34cdc\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/4a44c140cc2f3643a39e258bb0c0ab9d0f494f5e\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/6ee4dc7476b3abc92ec1d444533a559f33f59561\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/a46b35f213c2426f5d6a0458a8f7e873fc59cdfd\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/addbf02dfe3b25e7e38e03bbd4e2a6ed86a14be7\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/cba8543c18cf42fd80fd63effb6df6ff4f7e73ce\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}",
    "redhat_vex": {
      "aggregate_severity": "Important",
      "current_release_date": "2026-09-13T06:49:59+00:00",
      "cve": "CVE-2026-89533",
      "id": "CVE-2026-89533",
      "initial_release_date": "2026-09-11T19:44:12.236000+00:00",
      "product_status:known_affected": "2",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: Linux kernel: svcrdma Denial of Service due to incorrect offset arithmetic",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89533.json",
      "version": "3"
    }
  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.