CVE-2026-93211

Description

In the Linux kernel, the following vulnerability has been resolved: nfsd: initialize DRC hash table before registering shrinker shrinker_register() precedes the INIT_LIST_HEAD loop and the drc_hashsize store. On weakly-ordered architectures (arm64, ppc), a shrinker scan can observe drc_hashsize before the bucket list heads are initialized, causing a NULL deref in the DRC shrinker callback. Move bucket initialization and the drc_hashsize store before shrinker_register() so the hash table is fully initialized before it becomes visible to the shrinker.

Overview

State: PUBLISHED
Assigner (CNA): Linux
CVSS severity: —
CVSS score: —
CVSS vector: —
Effective score: no score available from CNA, NVD, or AI yet
CWE(s): —
Reserved: 2026-09-17
Published: 2026-09-24 15:10 UTC
Last updated: 2026-09-24 15:10 UTC
Source: https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/2026/93xxx/CVE-2026-93211.json

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Used only when a CVE has no official CVSS from its CNA or NVD. An LLM estimates the v3.1 base score from the description; a HIGH/CRITICAL estimate promotes the CVE to a Threat.

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European Union Vulnerability Database ENISA EUVD

ENISA's official EU repository for curated vulnerability intelligence. Carries a separate identifier (EUVD-YYYY-NNNN) and frequently exposes an earlier-published description + CVSS than NVD does.

EUVD ID: EUVD-2026-85940
Assigner: Linux
Published: Sep 24, 2026, 3:10:34 PM
Updated: Sep 24, 2026, 3:10:34 PM
EUVD base score: 0.0 / 10
EUVD-reported EPSS: 0.0000
Vendors: Linux
Products: Linux (8eea99a81c6f67c08fedd7db2ccd09aa93db69a7 <b0c58934f5cc4f05b63ef6605dd10c1d0d489e88)

Linux (8eea99a81c6f67c08fedd7db2ccd09aa93db69a7 <f060f43a67635dbb393bf5dcbfc3e8b9a44942cb)

Linux (patch: 6.18.50)

Linux (8eea99a81c6f67c08fedd7db2ccd09aa93db69a7 <431c70ca5163c98c746f22f16cd58ca5aefec6dc)

Linux (patch: 0)

Linux (patch: 6.12.109)

Linux (8eea99a81c6f67c08fedd7db2ccd09aa93db69a7 <b57bd8cb739cb3cf88bdb1a5903a42a707a5c282)

Linux (patch: 7.2.4)

Linux (6.7)

Linux (patch: 7.3-rc1)
Aliases: GHSA-4vgq-cgvq-hg3w

ENISA description: In the Linux kernel, the following vulnerability has been resolved: nfsd: initialize DRC hash table before registering shrinker shrinker_register() precedes the INIT_LIST_HEAD loop and the drc_hashsize store. On weakly-ordered architectures (arm64, ppc), a shrinker scan can observe drc_hashsize before the bucket list heads are initialized, causing a NULL deref in the DRC shrinker callback. Move bucket initialization and the drc_hashsize store before shrinker_register() so the hash table is fully initialized before it becomes visible to the shrinker.

EUVD references (4)

Affected products (2)

Vendor	Product	Versions	Platforms
Linux	Linux	`8eea99a81c6f67c08fedd7db2ccd09aa93db69a7` (affected), `8eea99a81c6f67c08fedd7db2ccd09aa93db69a7` (affected), `8eea99a81c6f67c08fedd7db2ccd09aa93db69a7` (affected), `8eea99a81c6f67c08fedd7db2ccd09aa93db69a7` (affected)	—
Linux	Linux	`6.7` (affected), `0` (unaffected), `6.12.109` (unaffected), `6.18.50` (unaffected), `7.2.4` (unaffected), `7.3-rc1` (unaffected)	—

Vendor references (4)

References embedded in the original CVE record by the assigning CNA.

Web references (0)

DuckDuckGo results ranked by threat-intel / vendor advisory domains. Generated by the 🔎 Find references (web) button above — same flow as the Remediations search.

No web references attached yet.

Remediations (10)

September 2026 Patch Tuesday: 9 Critical CVEs — Patch Now

web:byteiota.com

Microsoft's September 2026 Patch Tuesday fixes 9 vulnerabilities — all of them Critical. On paper, that sounds manageable after August's 421- CVE pile-up. In practice, one of these nine was already being exploited in the wild before the patch shipped. The others include two CVSS 10.0 flaws — the worst possible score — one of which simply had no authentication at all on an Azure AI ...

2026-09-25 10:45 UTC
CVE-2026-93111 · Linux · CVE Brief Analyst Report

web:cvebrief.com

Remediation Immediate Action: Update the Linux kernel to version 7.2.6 or later to incorporate the necessary fix for trampoline management. Proactive Monitoring: Monitor system logs for kernel warnings, particularly those referencing bpf_trampoline_multi_detach or ftrace management, which may indicate attempted exploitation.

2026-09-25 10:45 UTC
CVE-2026-93211: Linux Vulnerability - CVETodo

web:cvetodo.com

CVE-2026-93211 vulnerability details and analysis. Full technical analysis, mitigations , and exploit status — updated in real time.

2026-09-25 10:45 UTC
Patch Management and Mitigation Supported Product Versions

web:docs.qualys.com

Supported Product Versions and Operating Systems Learn more about the products and operating system versions that are supported for Qualys Patch Management and Mitigation . Supported Windows Products Supported Windows Operating Systems Supported Linux Operating Systems Supported Mac Products

2026-09-25 10:45 UTC
Security Update Guide - Microsoft

web:msrc-ppe.microsoft.com

The Microsoft Security Response Center (MSRC) investigates all reports of security vulnerabilities affecting Microsoft products and services, and provides the information here as part of the ongoing effort to help you manage security risks and help keep your systems protected.

2026-09-25 10:45 UTC
Security Update Guide - Microsoft Security Response Center

web:msrc.microsoft.com

Access Microsoft Security Response Center's guide to address vulnerabilities, manage security risks, and keep your systems protected with the latest updates.

2026-09-25 10:45 UTC
Security Update Guide - Microsoft Security Response Center

web:msrc.microsoft.com

Security Update Guide - Microsoft Security Response Center

2026-09-25 10:45 UTC
Cisco Advance Notification for Publication of September 16, 2026 ...

web:sec.cloudapps.cisco.com

On September 16, 2026 , the Cisco Product Security Incident Response Team (PSIRT) published the advisories that are listed in the following tables. To remediate these vulnerabilities, Cisco strongly recommends that customers upgrade to the fixed software that is indicated in the advisories. For more information about changes in Cisco PSIRT vulnerability disclosure, see Strengthening the ...

2026-09-25 10:45 UTC
Oracle Critical Patch Update Advisory - July 2026

web:www.oracle.com

This Critical Patch Update contains 1448 new security patches across the product families listed below. Please note that a My Oracle Support (MOS) note summarizing the content of this Critical Patch Update and other Oracle Software Security Assurance activities is located at July 2026 Critical Patch Update: Executive Summary and Analysis.

2026-09-25 10:45 UTC
Patch Tuesday September 2026: Security Updates & CVE Analysis

web:zecurit.com

Get the complete breakdown of Microsoft's September 2026 Patch Tuesday. We analyze the latest security updates and all critical CVEs .

2026-09-25 10:45 UTC

AI Forensic Analysis

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Raw JSON

The full cvelistV5 record. Download as CVE-2026-93211.json.

{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "fs/nfsd/nfscache.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "f060f43a67635dbb393bf5dcbfc3e8b9a44942cb",
              "status": "affected",
              "version": "8eea99a81c6f67c08fedd7db2ccd09aa93db69a7",
              "versionType": "git"
            },
            {
              "lessThan": "b57bd8cb739cb3cf88bdb1a5903a42a707a5c282",
              "status": "affected",
              "version": "8eea99a81c6f67c08fedd7db2ccd09aa93db69a7",
              "versionType": "git"
            },
            {
              "lessThan": "431c70ca5163c98c746f22f16cd58ca5aefec6dc",
              "status": "affected",
              "version": "8eea99a81c6f67c08fedd7db2ccd09aa93db69a7",
              "versionType": "git"
            },
            {
              "lessThan": "b0c58934f5cc4f05b63ef6605dd10c1d0d489e88",
              "status": "affected",
              "version": "8eea99a81c6f67c08fedd7db2ccd09aa93db69a7",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "fs/nfsd/nfscache.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.7"
            },
            {
              "lessThan": "6.7",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.109",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.50",
              "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": "6.12.109",
                  "versionStartIncluding": "6.7",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.50",
                  "versionStartIncluding": "6.7",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.2.4",
                  "versionStartIncluding": "6.7",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.3-rc1",
                  "versionStartIncluding": "6.7",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnfsd: initialize DRC hash table before registering shrinker\n\nshrinker_register() precedes the INIT_LIST_HEAD loop and the\ndrc_hashsize store. On weakly-ordered architectures (arm64, ppc),\na shrinker scan can observe drc_hashsize before the bucket list\nheads are initialized, causing a NULL deref in the DRC shrinker\ncallback.\n\nMove bucket initialization and the drc_hashsize store before\nshrinker_register() so the hash table is fully initialized before\nit becomes visible to the shrinker."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-09-24T15:10:34.407Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/f060f43a67635dbb393bf5dcbfc3e8b9a44942cb"
        },
        {
          "url": "https://git.kernel.org/stable/c/b57bd8cb739cb3cf88bdb1a5903a42a707a5c282"
        },
        {
          "url": "https://git.kernel.org/stable/c/431c70ca5163c98c746f22f16cd58ca5aefec6dc"
        },
        {
          "url": "https://git.kernel.org/stable/c/b0c58934f5cc4f05b63ef6605dd10c1d0d489e88"
        }
      ],
      "title": "nfsd: initialize DRC hash table before registering shrinker",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-93211",
    "datePublished": "2026-09-24T15:10:34.407Z",
    "dateReserved": "2026-09-17T16:02:15.093Z",
    "dateUpdated": "2026-09-24T15:10:34.407Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}