CVE-2026-89528

Status: ReceivedHigh (7.5)—

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.

CVSS

Version: 3.1
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Base score: 7.5

Exploitation probability (EPSS)

Probability of exploitation in the next 30 days: 0.66%
Percentile among all scored CVEs: 50
Score date: 10/6/2026

EPSS (Exploit Prediction Scoring System, FIRST) estimates how likely a vulnerability is to be exploited in the wild within 30 days. It complements CVSS (impact) and CISA KEV (confirmed exploitation).

🎯 ATT&CK techniques

How this vulnerability is exploited and what the attacker gains, in MITRE ATT&CK terms.

ExploitationT1190 Exploit Public-Facing Applicationinitial access75 %
Primary impactT1499.004 Application or System Exploitationimpact80 %

Kernel svcrdma permite denegación de servicio mediante lista Read malformada en red sin autenticación (AV:N, PR:N). NULL pointer dereference causa crash.

Inferred by our analysis agent from the official description, CVSS vector and CWE, and checked by a supervisor. May contain errors.

🛡️ ATT&CK mitigations that cover these techniques

Filter Network Traffic Vulnerability Scanning Privileged Account Management Network Segmentation Limit Access to Resource Over Network Application Isolation and Sandboxing

Affected technologies (1)

⚠ AI-inferred from the description — NVD hasn't analyzed this CVE yet, these aren't verified CPEs.

Linux — Linux Kernel^AI

References

Raw JSON (NVD)

Show

{
  "id": "CVE-2026-89528",
  "cveTags": [],
  "metrics": {
    "cvssMetricV31": [
      {
        "type": "Secondary",
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "cvssData": {
          "scope": "UNCHANGED",
          "version": "3.1",
          "baseScore": 7.5,
          "attackVector": "NETWORK",
          "baseSeverity": "HIGH",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
          "integrityImpact": "NONE",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "availabilityImpact": "HIGH",
          "privilegesRequired": "NONE",
          "confidentialityImpact": "NONE"
        },
        "impactScore": 3.6,
        "exploitabilityScore": 3.9
      }
    ]
  },
  "affected": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "affectedData": [
        {
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "product": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "026d958b38c628a1b4ced534808945365e2747a5",
              "lessThan": "1a3af2262cb384112ef38632de4690682be528b4",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "026d958b38c628a1b4ced534808945365e2747a5",
              "lessThan": "465f511f59a0fa7a80d5d1073c4b24f28ea38f58",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "026d958b38c628a1b4ced534808945365e2747a5",
              "lessThan": "0ca487abb3bdf581851664b5db21f364caf57682",
              "versionType": "git"
            }
          ],
          "programFiles": [
            "net/sunrpc/xprtrdma/svc_rdma_recvfrom.c"
          ],
          "defaultStatus": "unaffected"
        },
        {
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "product": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "4.13"
            },
            {
              "status": "unaffected",
              "version": "0",
              "lessThan": "4.13",
              "versionType": "semver"
            },
            {
              "status": "unaffected",
              "version": "6.18.51",
              "versionType": "semver",
              "lessThanOrEqual": "6.18.*"
            },
            {
              "status": "unaffected",
              "version": "7.2.4",
              "versionType": "semver",
              "lessThanOrEqual": "7.2.*"
            },
            {
              "status": "unaffected",
              "version": "7.3-rc1",
              "versionType": "original_commit_for_fix",
              "lessThanOrEqual": "*"
            }
          ],
          "programFiles": [
            "net/sunrpc/xprtrdma/svc_rdma_recvfrom.c"
          ],
          "defaultStatus": "affected"
        }
      ]
    }
  ],
  "published": "2026-09-11T20:19:35.613",
  "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"
    }
  ],
  "vulnStatus": "Received",
  "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."
    }
  ],
  "lastModified": "2026-09-13T07:17:15.120",
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}