CVE-2024-26822 (GCVE-0-2024-26822)

Vulnerability from cvelistv5 – Published: 2024-04-17 09:43 – Updated: 2026-08-05 11:27
VLAI
Title
smb: client: set correct id, uid and cruid for multiuser automounts
Summary
In the Linux kernel, the following vulnerability has been resolved: smb: client: set correct id, uid and cruid for multiuser automounts When uid, gid and cruid are not specified, we need to dynamically set them into the filesystem context used for automounting otherwise they'll end up reusing the values from the parent mount.
Severity
8.7 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:L
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator (v2.0.3)
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: c8117ac42303f7ae99bbe53e4952f7d147cca1fb , < 4a6e4c56721a3e6e2550b72ec56aab306c4607a7 (git)
Affected: 60e3318e3e900ba1ddfead937012b3432dfccc92 , < 2ceba8ae1bd1f5589548cb722a5c583ca3a2dede (git)
Affected: 9fd29a5bae6e8f94b410374099a6fddb253d2d5f , < c2aa2718cda2d56b4a551cb40043e9abc9684626 (git)
Affected: 9fd29a5bae6e8f94b410374099a6fddb253d2d5f , < 7590ba9057c6d74c66f3b909a383ec47cd2f27fb (git)
Affected: 9fd29a5bae6e8f94b410374099a6fddb253d2d5f , < 4508ec17357094e2075f334948393ddedbb75157 (git)
Affected: 5.15.124 , < 5.15.201 (semver)
Affected: 6.1.54 , < 6.1.164 (semver)
Create a notification for this product.
Linux Linux Affected: 6.2
Unaffected: 0 , < 6.2 (semver)
Unaffected: 5.15.201 , ≤ 5.15.* (semver)
Unaffected: 6.1.164 , ≤ 6.1.* (semver)
Unaffected: 6.6.18 , ≤ 6.6.* (semver)
Unaffected: 6.7.6 , ≤ 6.7.* (semver)
Unaffected: 6.8 , ≤ * (original_commit_for_fix)
Create a notification for this product.
Show details on NVD website
To clipboard 

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2024-26822",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2024-05-09T18:40:21.396618Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2024-06-04T17:48:41.629Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      },
      {
        "providerMetadata": {
          "dateUpdated": "2024-08-02T00:14:13.530Z",
          "orgId": "af854a3a-2127-422b-91ae-364da2661108",
          "shortName": "CVE"
        },
        "references": [
          {
            "tags": [
              "x_transferred"
            ],
            "url": "https://git.kernel.org/stable/c/c2aa2718cda2d56b4a551cb40043e9abc9684626"
          },
          {
            "tags": [
              "x_transferred"
            ],
            "url": "https://git.kernel.org/stable/c/7590ba9057c6d74c66f3b909a383ec47cd2f27fb"
          },
          {
            "tags": [
              "x_transferred"
            ],
            "url": "https://git.kernel.org/stable/c/4508ec17357094e2075f334948393ddedbb75157"
          }
        ],
        "title": "CVE Program Container"
      }
    ],
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "fs/smb/client/namespace.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "4a6e4c56721a3e6e2550b72ec56aab306c4607a7",
              "status": "affected",
              "version": "c8117ac42303f7ae99bbe53e4952f7d147cca1fb",
              "versionType": "git"
            },
            {
              "lessThan": "2ceba8ae1bd1f5589548cb722a5c583ca3a2dede",
              "status": "affected",
              "version": "60e3318e3e900ba1ddfead937012b3432dfccc92",
              "versionType": "git"
            },
            {
              "lessThan": "c2aa2718cda2d56b4a551cb40043e9abc9684626",
              "status": "affected",
              "version": "9fd29a5bae6e8f94b410374099a6fddb253d2d5f",
              "versionType": "git"
            },
            {
              "lessThan": "7590ba9057c6d74c66f3b909a383ec47cd2f27fb",
              "status": "affected",
              "version": "9fd29a5bae6e8f94b410374099a6fddb253d2d5f",
              "versionType": "git"
            },
            {
              "lessThan": "4508ec17357094e2075f334948393ddedbb75157",
              "status": "affected",
              "version": "9fd29a5bae6e8f94b410374099a6fddb253d2d5f",
              "versionType": "git"
            },
            {
              "lessThan": "5.15.201",
              "status": "affected",
              "version": "5.15.124",
              "versionType": "semver"
            },
            {
              "lessThan": "6.1.164",
              "status": "affected",
              "version": "6.1.54",
              "versionType": "semver"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "fs/smb/client/namespace.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.2"
            },
            {
              "lessThan": "6.2",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.201",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.164",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.18",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.7.*",
              "status": "unaffected",
              "version": "6.7.6",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "6.8",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.15.201",
                  "versionStartIncluding": "5.15.124",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.1.164",
                  "versionStartIncluding": "6.1.54",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.6.18",
                  "versionStartIncluding": "6.2",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.7.6",
                  "versionStartIncluding": "6.2",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.8",
                  "versionStartIncluding": "6.2",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nsmb: client: set correct id, uid and cruid for multiuser automounts\n\nWhen uid, gid and cruid are not specified, we need to dynamically\nset them into the filesystem context used for automounting otherwise\nthey\u0027ll end up reusing the values from the parent mount."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 8.7,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:L",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:L - The vulnerable code is reached by an ordinary path walk (`open`/`stat`/`chdir`) into a DFS junction or reparse point on a locally mounted SMB share, via `follow_automount()` \u2192 `cifs_d_automount()`. Delivery is a local syscall, not a network protocol message.\nAC:L - The attacker deterministically triggers the automount by traversing the path, and can plant the reparse-point/junction trigger themselves if they hold write access anywhere in the share; there is no race, no memory-layout dependency, and no reliance on victim state. `multiuser` plus DFS is the standard deployment for multi-user Linux clients in AD/Kerberos environments, not a rare configuration.\nPR:L - The attacker needs only an unprivileged local account with access to the existing `multiuser` CIFS mount; no capability, keyring privilege, or mount privilege is checked anywhere along `follow_automount()` \u2192 `cifs_do_automount()` \u2192 `fc_mount()`.\nUI:N - The attacker performs the triggering path traversal themselves and no other user has to act; the pre-existing `multiuser` mount is environment configuration established at boot/login, not victim interaction at exploit time.\nS:C - The wrong `cred_uid` makes the kernel request a Kerberos ticket for, and authenticate the submount as, a different principal (typically root or the machine account), so the impacted resources \u2014 server-side files and another principal\u0027s identity \u2014 are governed by the SMB server and KDC, a security authority distinct from the local kernel. This matches the repo\u0027s precedent of scoring cross-authority filesystem authorization bugs (e.g. CVE-2025-40362, ceph multifs MDS auth caps) as S:C.\nC:H - The unprivileged user obtains a tree connect and root/prefix-path queries against the DFS target under the mount owner\u0027s (typically root\u0027s) credentials, letting them read files and metadata across the DFS namespace they hold no rights to, with full control over which paths they target. The shared submount superblock and cache further break the per-user isolation `multiuser` exists to provide.\nI:H - The same borrowed high-privilege principal backs every operation issued over the submount\u0027s master tcon (including legacy `cifs_setattr`) and binds the whole submount namespace to another user\u0027s session, so data and metadata on the remote target can be modified under an identity the attacker does not own. Inode ownership on the submount is additionally attributed to the parent mount\u0027s uid/gid rather than the accessing user.\nA:L - There is no kernel crash, hang, or resource exhaustion, but automounts fail with -EACCES when the inherited `cred_uid`\u0027s credential is unusable (the originally reported symptom), and superblock reuse keyed on the wrong uid can wedge users out \u2014 denying access to the DFS subtree for legitimate users, a limited availability loss."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-05T11:27:37.199Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/4a6e4c56721a3e6e2550b72ec56aab306c4607a7"
        },
        {
          "url": "https://git.kernel.org/stable/c/2ceba8ae1bd1f5589548cb722a5c583ca3a2dede"
        },
        {
          "url": "https://git.kernel.org/stable/c/c2aa2718cda2d56b4a551cb40043e9abc9684626"
        },
        {
          "url": "https://git.kernel.org/stable/c/7590ba9057c6d74c66f3b909a383ec47cd2f27fb"
        },
        {
          "url": "https://git.kernel.org/stable/c/4508ec17357094e2075f334948393ddedbb75157"
        }
      ],
      "title": "smb: client: set correct id, uid and cruid for multiuser automounts",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2024-26822",
    "datePublished": "2024-04-17T09:43:49.221Z",
    "dateReserved": "2024-02-19T14:20:24.180Z",
    "dateUpdated": "2026-08-05T11:27:37.199Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2024-26822",
      "date": "2026-08-06",
      "epss": "0.00234",
      "percentile": "0.14284"
    },
    "fkie_nvd": {
      "descriptions": "[{\"lang\": \"en\", \"value\": \"In the Linux kernel, the following vulnerability has been resolved:\\n\\nsmb: client: set correct id, uid and cruid for multiuser automounts\\n\\nWhen uid, gid and cruid are not specified, we need to dynamically\\nset them into the filesystem context used for automounting otherwise\\nthey\u0027ll end up reusing the values from the parent mount.\"}, {\"lang\": \"es\", \"value\": \"En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: smb: cliente: configure el id, uid y cruid correctos para montajes autom\\u00e1ticos multiusuario Cuando no se especifican uid, gid y cruid, debemos configurarlos din\\u00e1micamente en el contexto del sistema de archivos utilizado para el montaje autom\\u00e1tico, de lo contrario terminar\\u00e1n reutilizando los valores del montaje principal.\"}]",
      "id": "CVE-2024-26822",
      "lastModified": "2024-11-21T09:03:08.987",
      "published": "2024-04-17T10:15:08.977",
      "references": "[{\"url\": \"https://git.kernel.org/stable/c/4508ec17357094e2075f334948393ddedbb75157\", \"source\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}, {\"url\": \"https://git.kernel.org/stable/c/7590ba9057c6d74c66f3b909a383ec47cd2f27fb\", \"source\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}, {\"url\": \"https://git.kernel.org/stable/c/c2aa2718cda2d56b4a551cb40043e9abc9684626\", \"source\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}, {\"url\": \"https://git.kernel.org/stable/c/4508ec17357094e2075f334948393ddedbb75157\", \"source\": \"af854a3a-2127-422b-91ae-364da2661108\"}, {\"url\": \"https://git.kernel.org/stable/c/7590ba9057c6d74c66f3b909a383ec47cd2f27fb\", \"source\": \"af854a3a-2127-422b-91ae-364da2661108\"}, {\"url\": \"https://git.kernel.org/stable/c/c2aa2718cda2d56b4a551cb40043e9abc9684626\", \"source\": \"af854a3a-2127-422b-91ae-364da2661108\"}]",
      "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "vulnStatus": "Awaiting Analysis"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2024-26822\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2024-04-17T10:15:08.977\",\"lastModified\":\"2026-08-04T11:17:10.240\",\"vulnStatus\":\"Modified\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nsmb: client: set correct id, uid and cruid for multiuser automounts\\n\\nWhen uid, gid and cruid are not specified, we need to dynamically\\nset them into the filesystem context used for automounting otherwise\\nthey\u0027ll end up reusing the values from the parent mount.\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: smb: cliente: configure el id, uid y cruid correctos para montajes autom\u00e1ticos multiusuario Cuando no se especifican uid, gid y cruid, debemos configurarlos din\u00e1micamente en el contexto del sistema de archivos utilizado para el montaje autom\u00e1tico, de lo contrario terminar\u00e1n reutilizando los valores del montaje principal.\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"fs/smb/client/namespace.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"c8117ac42303f7ae99bbe53e4952f7d147cca1fb\",\"lessThan\":\"4a6e4c56721a3e6e2550b72ec56aab306c4607a7\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"60e3318e3e900ba1ddfead937012b3432dfccc92\",\"lessThan\":\"2ceba8ae1bd1f5589548cb722a5c583ca3a2dede\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"9fd29a5bae6e8f94b410374099a6fddb253d2d5f\",\"lessThan\":\"c2aa2718cda2d56b4a551cb40043e9abc9684626\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"9fd29a5bae6e8f94b410374099a6fddb253d2d5f\",\"lessThan\":\"7590ba9057c6d74c66f3b909a383ec47cd2f27fb\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"9fd29a5bae6e8f94b410374099a6fddb253d2d5f\",\"lessThan\":\"4508ec17357094e2075f334948393ddedbb75157\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"5.15.124\",\"lessThan\":\"5.15.201\",\"versionType\":\"semver\",\"status\":\"affected\"},{\"version\":\"6.1.54\",\"lessThan\":\"6.1.164\",\"versionType\":\"semver\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"fs/smb/client/namespace.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"6.2\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"6.2\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.15.201\",\"lessThanOrEqual\":\"5.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.164\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.18\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.7.6\",\"lessThanOrEqual\":\"6.7.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.8\",\"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:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:L\",\"baseScore\":8.7,\"baseSeverity\":\"HIGH\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"CHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"HIGH\",\"availabilityImpact\":\"LOW\"},\"exploitabilityScore\":2.0,\"impactScore\":6.0},{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N\",\"baseScore\":5.5,\"baseSeverity\":\"MEDIUM\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"NONE\",\"integrityImpact\":\"HIGH\",\"availabilityImpact\":\"NONE\"},\"exploitabilityScore\":1.8,\"impactScore\":3.6}],\"ssvcV203\":[{\"source\":\"134c704f-9b21-4f2e-91b3-4a467353bcc0\",\"ssvcData\":{\"timestamp\":\"2024-05-09T18:40:21.396618Z\",\"id\":\"CVE-2024-26822\",\"options\":[{\"exploitation\":\"none\"},{\"automatable\":\"no\"},{\"technicalImpact\":\"partial\"}],\"role\":\"CISA Coordinator\",\"version\":\"2.0.3\"}}]},\"weaknesses\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"description\":[{\"lang\":\"en\",\"value\":\"NVD-CWE-noinfo\"}]}],\"configurations\":[{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.2\",\"versionEndExcluding\":\"6.6.18\",\"matchCriteriaId\":\"BD961E49-FEDA-47CF-BF23-4D2BD942B4E0\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.7\",\"versionEndExcluding\":\"6.7.6\",\"matchCriteriaId\":\"C6D6A5C8-7308-42A9-8A72-ABF3DEA4BB82\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:5.15.124:*:*:*:*:*:*:*\",\"matchCriteriaId\":\"3645B06F-218B-42CB-88DD-48F9EDC76940\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:6.1.54:*:*:*:*:*:*:*\",\"matchCriteriaId\":\"99E7BF45-E0E8-4413-9C8F-D592CF7C9F0A\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:6.8:rc1:*:*:*:*:*:*\",\"matchCriteriaId\":\"B9F4EA73-0894-400F-A490-3A397AB7A517\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:6.8:rc2:*:*:*:*:*:*\",\"matchCriteriaId\":\"056BD938-0A27-4569-B391-30578B309EE3\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:6.8:rc3:*:*:*:*:*:*\",\"matchCriteriaId\":\"F02056A5-B362-4370-9FF8-6F0BD384D520\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:6.8:rc4:*:*:*:*:*:*\",\"matchCriteriaId\":\"62075ACE-B2A0-4B16-829D-B3DA5AE5CC41\"}]}]}],\"references\":[{\"url\":\"https://git.kernel.org/stable/c/2ceba8ae1bd1f5589548cb722a5c583ca3a2dede\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/4508ec17357094e2075f334948393ddedbb75157\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/4a6e4c56721a3e6e2550b72ec56aab306c4607a7\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/7590ba9057c6d74c66f3b909a383ec47cd2f27fb\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/c2aa2718cda2d56b4a551cb40043e9abc9684626\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/4508ec17357094e2075f334948393ddedbb75157\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/7590ba9057c6d74c66f3b909a383ec47cd2f27fb\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/c2aa2718cda2d56b4a551cb40043e9abc9684626\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Patch\"]}]}}",
    "redhat_vex": {
      "aggregate_severity": "Low",
      "current_release_date": "2026-08-04T22:50:03+00:00",
      "cve": "CVE-2024-26822",
      "id": "CVE-2024-26822",
      "initial_release_date": "2024-04-17T00:00:00+00:00",
      "product_status:known_not_affected": "198",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: smb: client: set correct id, uid and cruid for multiuser automounts",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2024/cve-2024-26822.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-08-05T01:00:56Z",
      "cve": "CVE-2024-26822",
      "id": "CVE-2024-26822",
      "initial_release_date": "2024-04-19T02:18:44Z",
      "product_status:known_affected": "370",
      "product_status:known_not_affected": "154",
      "product_status:recommended": "762",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2024-26822",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2024-26822.json",
      "version": "92"
    },
    "vulnrichment": {
      "containers": "{\"adp\": [{\"title\": \"CVE Program Container\", \"references\": [{\"url\": \"https://git.kernel.org/stable/c/c2aa2718cda2d56b4a551cb40043e9abc9684626\", \"tags\": [\"x_transferred\"]}, {\"url\": \"https://git.kernel.org/stable/c/7590ba9057c6d74c66f3b909a383ec47cd2f27fb\", \"tags\": [\"x_transferred\"]}, {\"url\": \"https://git.kernel.org/stable/c/4508ec17357094e2075f334948393ddedbb75157\", \"tags\": [\"x_transferred\"]}], \"providerMetadata\": {\"orgId\": \"af854a3a-2127-422b-91ae-364da2661108\", \"shortName\": \"CVE\", \"dateUpdated\": \"2024-08-02T00:14:13.530Z\"}}, {\"metrics\": [{\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2024-26822\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"none\"}, {\"Automatable\": \"no\"}, {\"Technical Impact\": \"partial\"}], \"version\": \"2.0.3\", \"timestamp\": \"2024-05-09T18:40:21.396618Z\"}}}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2024-05-23T19:01:24.266Z\"}, \"title\": \"CISA ADP Vulnrichment\"}], \"cna\": {\"title\": \"smb: client: set correct id, uid and cruid for multiuser automounts\", \"metrics\": [{\"cvssV3_1\": {\"version\": \"3.1\", \"baseScore\": 8.7, \"baseSeverity\": \"HIGH\", \"vectorString\": \"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:L\"}, \"scenarios\": [{\"lang\": \"en\", \"value\": \"AV:L - The vulnerable code is reached by an ordinary path walk (`open`/`stat`/`chdir`) into a DFS junction or reparse point on a locally mounted SMB share, via `follow_automount()` \\u2192 `cifs_d_automount()`. Delivery is a local syscall, not a network protocol message.\\nAC:L - The attacker deterministically triggers the automount by traversing the path, and can plant the reparse-point/junction trigger themselves if they hold write access anywhere in the share; there is no race, no memory-layout dependency, and no reliance on victim state. `multiuser` plus DFS is the standard deployment for multi-user Linux clients in AD/Kerberos environments, not a rare configuration.\\nPR:L - The attacker needs only an unprivileged local account with access to the existing `multiuser` CIFS mount; no capability, keyring privilege, or mount privilege is checked anywhere along `follow_automount()` \\u2192 `cifs_do_automount()` \\u2192 `fc_mount()`.\\nUI:N - The attacker performs the triggering path traversal themselves and no other user has to act; the pre-existing `multiuser` mount is environment configuration established at boot/login, not victim interaction at exploit time.\\nS:C - The wrong `cred_uid` makes the kernel request a Kerberos ticket for, and authenticate the submount as, a different principal (typically root or the machine account), so the impacted resources \\u2014 server-side files and another principal\u0027s identity \\u2014 are governed by the SMB server and KDC, a security authority distinct from the local kernel. This matches the repo\u0027s precedent of scoring cross-authority filesystem authorization bugs (e.g. CVE-2025-40362, ceph multifs MDS auth caps) as S:C.\\nC:H - The unprivileged user obtains a tree connect and root/prefix-path queries against the DFS target under the mount owner\u0027s (typically root\u0027s) credentials, letting them read files and metadata across the DFS namespace they hold no rights to, with full control over which paths they target. The shared submount superblock and cache further break the per-user isolation `multiuser` exists to provide.\\nI:H - The same borrowed high-privilege principal backs every operation issued over the submount\u0027s master tcon (including legacy `cifs_setattr`) and binds the whole submount namespace to another user\u0027s session, so data and metadata on the remote target can be modified under an identity the attacker does not own. Inode ownership on the submount is additionally attributed to the parent mount\u0027s uid/gid rather than the accessing user.\\nA:L - There is no kernel crash, hang, or resource exhaustion, but automounts fail with -EACCES when the inherited `cred_uid`\u0027s credential is unusable (the originally reported symptom), and superblock reuse keyed on the wrong uid can wedge users out \\u2014 denying access to the DFS subtree for legitimate users, a limited availability loss.\"}]}], \"affected\": [{\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"c8117ac42303f7ae99bbe53e4952f7d147cca1fb\", \"lessThan\": \"4a6e4c56721a3e6e2550b72ec56aab306c4607a7\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"60e3318e3e900ba1ddfead937012b3432dfccc92\", \"lessThan\": \"2ceba8ae1bd1f5589548cb722a5c583ca3a2dede\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"9fd29a5bae6e8f94b410374099a6fddb253d2d5f\", \"lessThan\": \"c2aa2718cda2d56b4a551cb40043e9abc9684626\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"9fd29a5bae6e8f94b410374099a6fddb253d2d5f\", \"lessThan\": \"7590ba9057c6d74c66f3b909a383ec47cd2f27fb\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"9fd29a5bae6e8f94b410374099a6fddb253d2d5f\", \"lessThan\": \"4508ec17357094e2075f334948393ddedbb75157\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"5.15.124\", \"lessThan\": \"5.15.201\", \"versionType\": \"semver\"}, {\"status\": \"affected\", \"version\": \"6.1.54\", \"lessThan\": \"6.1.164\", \"versionType\": \"semver\"}], \"programFiles\": [\"fs/smb/client/namespace.c\"], \"defaultStatus\": \"unaffected\"}, {\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"6.2\"}, {\"status\": \"unaffected\", \"version\": \"0\", \"lessThan\": \"6.2\", \"versionType\": \"semver\"}, {\"status\": \"unaffected\", \"version\": \"5.15.201\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.15.*\"}, {\"status\": \"unaffected\", \"version\": \"6.1.164\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.1.*\"}, {\"status\": \"unaffected\", \"version\": \"6.6.18\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.6.*\"}, {\"status\": \"unaffected\", \"version\": \"6.7.6\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.7.*\"}, {\"status\": \"unaffected\", \"version\": \"6.8\", \"versionType\": \"original_commit_for_fix\", \"lessThanOrEqual\": \"*\"}], \"programFiles\": [\"fs/smb/client/namespace.c\"], \"defaultStatus\": \"affected\"}], \"references\": [{\"url\": \"https://git.kernel.org/stable/c/4a6e4c56721a3e6e2550b72ec56aab306c4607a7\"}, {\"url\": \"https://git.kernel.org/stable/c/2ceba8ae1bd1f5589548cb722a5c583ca3a2dede\"}, {\"url\": \"https://git.kernel.org/stable/c/c2aa2718cda2d56b4a551cb40043e9abc9684626\"}, {\"url\": \"https://git.kernel.org/stable/c/7590ba9057c6d74c66f3b909a383ec47cd2f27fb\"}, {\"url\": \"https://git.kernel.org/stable/c/4508ec17357094e2075f334948393ddedbb75157\"}], \"x_generator\": {\"engine\": \"bippy-1.2.0\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"In the Linux kernel, the following vulnerability has been resolved:\\n\\nsmb: client: set correct id, uid and cruid for multiuser automounts\\n\\nWhen uid, gid and cruid are not specified, we need to dynamically\\nset them into the filesystem context used for automounting otherwise\\nthey\u0027ll end up reusing the values from the parent mount.\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.15.201\", \"versionStartIncluding\": \"5.15.124\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.1.164\", \"versionStartIncluding\": \"6.1.54\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.6.18\", \"versionStartIncluding\": \"6.2\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.7.6\", \"versionStartIncluding\": \"6.2\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.8\", \"versionStartIncluding\": \"6.2\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2026-08-05T11:27:37.199Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2024-26822\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-08-05T11:27:37.199Z\", \"dateReserved\": \"2024-02-19T14:20:24.180Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2024-04-17T09:43:49.221Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



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.