GCVE Workshop - 22 September 2026 (14:00-18:00), Luxembourg Before The Vulnopticon Conference - Registration

CVE-2026-89528 (GCVE-0-2026-89528)

Vulnerability from cvelistv5 – Published: 2026-09-11 19:44 – Updated: 2026-09-13 06:30
VLAI
Title
svcrdma: Reject Read lists that exceed the page budget
Summary
In the Linux kernel, the following vulnerability has been resolved: svcrdma: Reject Read lists that exceed the page budget Individual Read segment lengths are validated at decode time, but nothing prevents a requester from sending multiple segments whose cumulative length exceeds the rq_pages array budget. When one segment fills the page array exactly, the runtime guard in svc_rdma_build_read_segment() is bypassed because len reaches zero. A subsequent segment then accesses the NULL sentinel slot at rq_pages[rq_maxpages], resulting in a NULL pointer dereference during DMA mapping. Accumulate pages across all Read segments and reject the message at decode time when the total would overflow the page budget.
Severity
7.5 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 026d958b38c628a1b4ced534808945365e2747a5 , < 1a3af2262cb384112ef38632de4690682be528b4 (git)
Affected: 026d958b38c628a1b4ced534808945365e2747a5 , < 465f511f59a0fa7a80d5d1073c4b24f28ea38f58 (git)
Affected: 026d958b38c628a1b4ced534808945365e2747a5 , < 0ca487abb3bdf581851664b5db21f364caf57682 (git)
guessed Create a notification for this product.
Linux Linux Affected: 4.13
Unaffected: 0 , < 4.13 (semver)
Unaffected: 6.18.51 , ≤ 6.18.* (semver)
Unaffected: 7.2.4 , ≤ 7.2.* (semver)
Unaffected: 7.3-rc1 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
Show details on NVD website
To clipboard 

{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/sunrpc/xprtrdma/svc_rdma_recvfrom.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "1a3af2262cb384112ef38632de4690682be528b4",
              "status": "affected",
              "version": "026d958b38c628a1b4ced534808945365e2747a5",
              "versionType": "git"
            },
            {
              "lessThan": "465f511f59a0fa7a80d5d1073c4b24f28ea38f58",
              "status": "affected",
              "version": "026d958b38c628a1b4ced534808945365e2747a5",
              "versionType": "git"
            },
            {
              "lessThan": "0ca487abb3bdf581851664b5db21f364caf57682",
              "status": "affected",
              "version": "026d958b38c628a1b4ced534808945365e2747a5",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "net/sunrpc/xprtrdma/svc_rdma_recvfrom.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "4.13"
            },
            {
              "lessThan": "4.13",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.51",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.2.*",
              "status": "unaffected",
              "version": "7.2.4",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.3-rc1",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.51",
                  "versionStartIncluding": "4.13",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.2.4",
                  "versionStartIncluding": "4.13",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.3-rc1",
                  "versionStartIncluding": "4.13",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nsvcrdma: Reject Read lists that exceed the page budget\n\nIndividual Read segment lengths are validated at decode time, but\nnothing prevents a requester from sending multiple segments whose\ncumulative length exceeds the rq_pages array budget. When one\nsegment fills the page array exactly, the runtime guard in\nsvc_rdma_build_read_segment() is bypassed because len reaches zero.\nA subsequent segment then accesses the NULL sentinel slot at\nrq_pages[rq_maxpages], resulting in a NULL pointer dereference during\nDMA mapping.\n\nAccumulate pages across all Read segments and reject the message at\ndecode time when the total would overflow the page budget."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 7.5,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:N - svcrdma is nfsd\u0027s RPC-over-RDMA server transport; a remote peer reaches svc_rdma_recvfrom() by sending a Call with a Read list on an enabled NFS/RDMA listener over routable RoCEv2 or iWARP.\nAC:L - The attacker fully controls Read-segment lengths in the transport header and can deterministically fill rq_pages exactly, then send a further segment so the len==0 overrun guard is skipped and the NULL sentinel is DMA-mapped, with no race or uncontrollable layout.\nPR:N - xdr_count_read_segments() and svc_rdma_build_read_segment() run 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 an over-budget Read list is sufficient; no victim mount, click, or other user action is required.\nS:U - The NULL dereference oops stays in the host kernel that owns nfsd/svcrdma; this is not a VM, IOMMU, or sandbox escape.\nC:N - The fault is a NULL pointer dereference of the rq_pages[rq_maxpages] sentinel during DMA mapping; the access faults immediately and does not disclose kernel memory.\nI:N - The sentinel slot is a guaranteed NULL page pointer, not an out-of-bounds page used as a write destination; DMA mapping aborts on the NULL page without an arbitrary-write or control-flow hijack primitive.\nA:H - DMA mapping the NULL sentinel produces a kernel oops or panic that an unauthenticated NFS/RDMA peer can trigger repeatedly."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-09-13T06:30:25.969Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/1a3af2262cb384112ef38632de4690682be528b4"
        },
        {
          "url": "https://git.kernel.org/stable/c/465f511f59a0fa7a80d5d1073c4b24f28ea38f58"
        },
        {
          "url": "https://git.kernel.org/stable/c/0ca487abb3bdf581851664b5db21f364caf57682"
        }
      ],
      "title": "svcrdma: Reject Read lists that exceed the page budget",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-89528",
    "datePublished": "2026-09-11T19:44:08.514Z",
    "dateReserved": "2026-09-11T19:38:34.719Z",
    "dateUpdated": "2026-09-13T06:30:25.969Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2026-89528",
      "date": "2026-09-16",
      "epss": "0.00627",
      "percentile": "0.48423"
    },
    "microsoft_vex": {
      "current_release_date": "2026-09-14T14:52:06.000Z",
      "cve": "CVE-2026-89528",
      "id": "msrc_CVE-2026-89528",
      "initial_release_date": "2026-09-13T01:05:45.000Z",
      "product_status:known_affected": "1",
      "source": "Microsoft CSAF VEX",
      "status": "final",
      "title": "svcrdma: Reject Read lists that exceed the page budget",
      "url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-89528.json",
      "version": "2"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2026-89528\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2026-09-11T20:19:35.613\",\"lastModified\":\"2026-09-13T07:17:15.120\",\"vulnStatus\":\"Received\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nsvcrdma: Reject Read lists that exceed the page budget\\n\\nIndividual Read segment lengths are validated at decode time, but\\nnothing prevents a requester from sending multiple segments whose\\ncumulative length exceeds the rq_pages array budget. When one\\nsegment fills the page array exactly, the runtime guard in\\nsvc_rdma_build_read_segment() is bypassed because len reaches zero.\\nA subsequent segment then accesses the NULL sentinel slot at\\nrq_pages[rq_maxpages], resulting in a NULL pointer dereference during\\nDMA mapping.\\n\\nAccumulate pages across all Read segments and reject the message at\\ndecode time when the total would overflow the page budget.\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"net/sunrpc/xprtrdma/svc_rdma_recvfrom.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"026d958b38c628a1b4ced534808945365e2747a5\",\"lessThan\":\"1a3af2262cb384112ef38632de4690682be528b4\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"026d958b38c628a1b4ced534808945365e2747a5\",\"lessThan\":\"465f511f59a0fa7a80d5d1073c4b24f28ea38f58\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"026d958b38c628a1b4ced534808945365e2747a5\",\"lessThan\":\"0ca487abb3bdf581851664b5db21f364caf57682\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"net/sunrpc/xprtrdma/svc_rdma_recvfrom.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"4.13\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"4.13\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.51\",\"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:N/I:N/A:H\",\"baseScore\":7.5,\"baseSeverity\":\"HIGH\",\"attackVector\":\"NETWORK\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"NONE\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"NONE\",\"integrityImpact\":\"NONE\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":3.9,\"impactScore\":3.6}]},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/0ca487abb3bdf581851664b5db21f364caf57682\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/1a3af2262cb384112ef38632de4690682be528b4\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/465f511f59a0fa7a80d5d1073c4b24f28ea38f58\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}",
    "redhat_vex": {
      "aggregate_severity": "Important",
      "current_release_date": "2026-09-13T06:49:54+00:00",
      "cve": "CVE-2026-89528",
      "id": "CVE-2026-89528",
      "initial_release_date": "2026-09-11T19:44:08.514000+00:00",
      "product_status:known_affected": "2",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: Linux kernel: Denial of Service in svcrdma due to page budget overflow",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89528.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "important",
      "current_release_date": "2026-09-16T15:37:21Z",
      "cve": "CVE-2026-89528",
      "id": "CVE-2026-89528",
      "initial_release_date": "2026-09-12T16:26:45Z",
      "product_status:known_affected": "347",
      "product_status:known_not_affected": "6",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-89528",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-89528.json",
      "version": "4"
    }
  }
}



Log in or create an account to share your comment.




Tags
Taxonomy of the tags.





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.


Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.