CVE-2024-39463 (GCVE-0-2024-39463)

Vulnerability from cvelistv5 – Published: 2024-06-25 14:25 – Updated: 2025-05-04 09:16
VLAI?
Title
9p: add missing locking around taking dentry fid list
Summary
In the Linux kernel, the following vulnerability has been resolved: 9p: add missing locking around taking dentry fid list Fix a use-after-free on dentry's d_fsdata fid list when a thread looks up a fid through dentry while another thread unlinks it: UAF thread: refcount_t: addition on 0; use-after-free. p9_fid_get linux/./include/net/9p/client.h:262 v9fs_fid_find+0x236/0x280 linux/fs/9p/fid.c:129 v9fs_fid_lookup_with_uid linux/fs/9p/fid.c:181 v9fs_fid_lookup+0xbf/0xc20 linux/fs/9p/fid.c:314 v9fs_vfs_getattr_dotl+0xf9/0x360 linux/fs/9p/vfs_inode_dotl.c:400 vfs_statx+0xdd/0x4d0 linux/fs/stat.c:248 Freed by: p9_fid_destroy (inlined) p9_client_clunk+0xb0/0xe0 linux/net/9p/client.c:1456 p9_fid_put linux/./include/net/9p/client.h:278 v9fs_dentry_release+0xb5/0x140 linux/fs/9p/vfs_dentry.c:55 v9fs_remove+0x38f/0x620 linux/fs/9p/vfs_inode.c:518 vfs_unlink+0x29a/0x810 linux/fs/namei.c:4335 The problem is that d_fsdata was not accessed under d_lock, because d_release() normally is only called once the dentry is otherwise no longer accessible but since we also call it explicitly in v9fs_remove that lock is required: move the hlist out of the dentry under lock then unref its fids once they are no longer accessible.
Severity ?
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CWE
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 154372e67d4053e56591245eb413686621941333 , < 3bb6763a8319170c2d41c4232c8e7e4c37dcacfb (git)
Affected: 154372e67d4053e56591245eb413686621941333 , < cb299cdba09f46f090b843d78ba26b667d50a456 (git)
Affected: 154372e67d4053e56591245eb413686621941333 , < f0c5c944c6d8614c19e6e9a97fd2011dcd30e8f5 (git)
Affected: 154372e67d4053e56591245eb413686621941333 , < fe17ebf22feb4ad7094d597526d558a49aac92b4 (git)
Affected: 154372e67d4053e56591245eb413686621941333 , < c898afdc15645efb555acb6d85b484eb40a45409 (git)
Create a notification for this product.
    Linux Linux Affected: 5.11
Unaffected: 0 , < 5.11 (semver)
Unaffected: 5.15.168 , ≤ 5.15.* (semver)
Unaffected: 6.1.94 , ≤ 6.1.* (semver)
Unaffected: 6.6.34 , ≤ 6.6.* (semver)
Unaffected: 6.9.5 , ≤ 6.9.* (semver)
Unaffected: 6.10 , ≤ * (original_commit_for_fix)
Create a notification for this product.
Show details on NVD website
To clipboard 

{
  "containers": {
    "adp": [
      {
        "providerMetadata": {
          "dateUpdated": "2024-08-02T04:26:15.245Z",
          "orgId": "af854a3a-2127-422b-91ae-364da2661108",
          "shortName": "CVE"
        },
        "references": [
          {
            "tags": [
              "x_transferred"
            ],
            "url": "https://git.kernel.org/stable/c/cb299cdba09f46f090b843d78ba26b667d50a456"
          },
          {
            "tags": [
              "x_transferred"
            ],
            "url": "https://git.kernel.org/stable/c/f0c5c944c6d8614c19e6e9a97fd2011dcd30e8f5"
          },
          {
            "tags": [
              "x_transferred"
            ],
            "url": "https://git.kernel.org/stable/c/fe17ebf22feb4ad7094d597526d558a49aac92b4"
          },
          {
            "tags": [
              "x_transferred"
            ],
            "url": "https://git.kernel.org/stable/c/c898afdc15645efb555acb6d85b484eb40a45409"
          }
        ],
        "title": "CVE Program Container"
      },
      {
        "affected": [
          {
            "cpes": [
              "cpe:2.3:o:linux:linux_kernel:5.11:*:*:*:*:*:*:*"
            ],
            "defaultStatus": "affected",
            "product": "linux_kernel",
            "vendor": "linux",
            "versions": [
              {
                "status": "affected",
                "version": "5.11"
              }
            ]
          },
          {
            "cpes": [
              "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*"
            ],
            "defaultStatus": "unaffected",
            "product": "linux_kernel",
            "vendor": "linux",
            "versions": [
              {
                "lessThan": "cb299cdba09f",
                "status": "affected",
                "version": "154372e67d40",
                "versionType": "custom"
              },
              {
                "lessThan": "f0c5c944c6d8",
                "status": "affected",
                "version": "154372e67d40",
                "versionType": "custom"
              },
              {
                "lessThan": "fe17ebf22feb",
                "status": "affected",
                "version": "154372e67d40",
                "versionType": "custom"
              },
              {
                "lessThan": "c898afdc1564",
                "status": "affected",
                "version": "154372e67d40",
                "versionType": "custom"
              }
            ]
          }
        ],
        "metrics": [
          {
            "cvssV3_1": {
              "attackComplexity": "LOW",
              "attackVector": "LOCAL",
              "availabilityImpact": "HIGH",
              "baseScore": 7.8,
              "baseSeverity": "HIGH",
              "confidentialityImpact": "HIGH",
              "integrityImpact": "HIGH",
              "privilegesRequired": "LOW",
              "scope": "UNCHANGED",
              "userInteraction": "NONE",
              "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
              "version": "3.1"
            }
          },
          {
            "other": {
              "content": {
                "id": "CVE-2024-39463",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "total"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2024-09-10T03:55:21.281977Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "problemTypes": [
          {
            "descriptions": [
              {
                "cweId": "CWE-416",
                "description": "CWE-416 Use After Free",
                "lang": "en",
                "type": "CWE"
              }
            ]
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2024-09-10T15:36:18.860Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "fs/9p/vfs_dentry.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "3bb6763a8319170c2d41c4232c8e7e4c37dcacfb",
              "status": "affected",
              "version": "154372e67d4053e56591245eb413686621941333",
              "versionType": "git"
            },
            {
              "lessThan": "cb299cdba09f46f090b843d78ba26b667d50a456",
              "status": "affected",
              "version": "154372e67d4053e56591245eb413686621941333",
              "versionType": "git"
            },
            {
              "lessThan": "f0c5c944c6d8614c19e6e9a97fd2011dcd30e8f5",
              "status": "affected",
              "version": "154372e67d4053e56591245eb413686621941333",
              "versionType": "git"
            },
            {
              "lessThan": "fe17ebf22feb4ad7094d597526d558a49aac92b4",
              "status": "affected",
              "version": "154372e67d4053e56591245eb413686621941333",
              "versionType": "git"
            },
            {
              "lessThan": "c898afdc15645efb555acb6d85b484eb40a45409",
              "status": "affected",
              "version": "154372e67d4053e56591245eb413686621941333",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "fs/9p/vfs_dentry.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "5.11"
            },
            {
              "lessThan": "5.11",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.168",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.94",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.34",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.9.*",
              "status": "unaffected",
              "version": "6.9.5",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "6.10",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.15.168",
                  "versionStartIncluding": "5.11",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.1.94",
                  "versionStartIncluding": "5.11",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.6.34",
                  "versionStartIncluding": "5.11",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.9.5",
                  "versionStartIncluding": "5.11",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.10",
                  "versionStartIncluding": "5.11",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\n9p: add missing locking around taking dentry fid list\n\nFix a use-after-free on dentry\u0027s d_fsdata fid list when a thread\nlooks up a fid through dentry while another thread unlinks it:\n\nUAF thread:\nrefcount_t: addition on 0; use-after-free.\n p9_fid_get linux/./include/net/9p/client.h:262\n v9fs_fid_find+0x236/0x280 linux/fs/9p/fid.c:129\n v9fs_fid_lookup_with_uid linux/fs/9p/fid.c:181\n v9fs_fid_lookup+0xbf/0xc20 linux/fs/9p/fid.c:314\n v9fs_vfs_getattr_dotl+0xf9/0x360 linux/fs/9p/vfs_inode_dotl.c:400\n vfs_statx+0xdd/0x4d0 linux/fs/stat.c:248\n\nFreed by:\n p9_fid_destroy (inlined)\n p9_client_clunk+0xb0/0xe0 linux/net/9p/client.c:1456\n p9_fid_put linux/./include/net/9p/client.h:278\n v9fs_dentry_release+0xb5/0x140 linux/fs/9p/vfs_dentry.c:55\n v9fs_remove+0x38f/0x620 linux/fs/9p/vfs_inode.c:518\n vfs_unlink+0x29a/0x810 linux/fs/namei.c:4335\n\nThe problem is that d_fsdata was not accessed under d_lock, because\nd_release() normally is only called once the dentry is otherwise no\nlonger accessible but since we also call it explicitly in v9fs_remove\nthat lock is required:\nmove the hlist out of the dentry under lock then unref its fids once\nthey are no longer accessible."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2025-05-04T09:16:20.926Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/3bb6763a8319170c2d41c4232c8e7e4c37dcacfb"
        },
        {
          "url": "https://git.kernel.org/stable/c/cb299cdba09f46f090b843d78ba26b667d50a456"
        },
        {
          "url": "https://git.kernel.org/stable/c/f0c5c944c6d8614c19e6e9a97fd2011dcd30e8f5"
        },
        {
          "url": "https://git.kernel.org/stable/c/fe17ebf22feb4ad7094d597526d558a49aac92b4"
        },
        {
          "url": "https://git.kernel.org/stable/c/c898afdc15645efb555acb6d85b484eb40a45409"
        },
        {
          "url": "https://www.zerodayinitiative.com/advisories/ZDI-24-1194/"
        }
      ],
      "title": "9p: add missing locking around taking dentry fid list",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2024-39463",
    "datePublished": "2024-06-25T14:25:02.887Z",
    "dateReserved": "2024-06-25T14:23:23.744Z",
    "dateUpdated": "2025-05-04T09:16:20.926Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.1",
  "vulnerability-lookup:meta": {
    "fkie_nvd": {
      "configurations": "[{\"nodes\": [{\"operator\": \"OR\", \"negate\": false, \"cpeMatch\": [{\"vulnerable\": true, \"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"versionStartIncluding\": \"5.11\", \"versionEndExcluding\": \"6.1.94\", \"matchCriteriaId\": \"0F1BDCB0-B227-4406-81D0-90429CAF5F99\"}, {\"vulnerable\": true, \"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"versionStartIncluding\": \"6.2\", \"versionEndExcluding\": \"6.6.34\", \"matchCriteriaId\": \"6BD9DCFD-0342-4039-B8CE-70F26DB7173B\"}, {\"vulnerable\": true, \"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"versionStartIncluding\": \"6.7\", \"versionEndExcluding\": \"6.9.5\", \"matchCriteriaId\": \"8366481F-770F-4850-9D0F-2977BD97D5C5\"}, {\"vulnerable\": true, \"criteria\": \"cpe:2.3:o:linux:linux_kernel:6.10:rc1:*:*:*:*:*:*\", \"matchCriteriaId\": \"2EBB4392-5FA6-4DA9-9772-8F9C750109FA\"}]}]}]",
      "descriptions": "[{\"lang\": \"en\", \"value\": \"In the Linux kernel, the following vulnerability has been resolved:\\n\\n9p: add missing locking around taking dentry fid list\\n\\nFix a use-after-free on dentry\u0027s d_fsdata fid list when a thread\\nlooks up a fid through dentry while another thread unlinks it:\\n\\nUAF thread:\\nrefcount_t: addition on 0; use-after-free.\\n p9_fid_get linux/./include/net/9p/client.h:262\\n v9fs_fid_find+0x236/0x280 linux/fs/9p/fid.c:129\\n v9fs_fid_lookup_with_uid linux/fs/9p/fid.c:181\\n v9fs_fid_lookup+0xbf/0xc20 linux/fs/9p/fid.c:314\\n v9fs_vfs_getattr_dotl+0xf9/0x360 linux/fs/9p/vfs_inode_dotl.c:400\\n vfs_statx+0xdd/0x4d0 linux/fs/stat.c:248\\n\\nFreed by:\\n p9_fid_destroy (inlined)\\n p9_client_clunk+0xb0/0xe0 linux/net/9p/client.c:1456\\n p9_fid_put linux/./include/net/9p/client.h:278\\n v9fs_dentry_release+0xb5/0x140 linux/fs/9p/vfs_dentry.c:55\\n v9fs_remove+0x38f/0x620 linux/fs/9p/vfs_inode.c:518\\n vfs_unlink+0x29a/0x810 linux/fs/namei.c:4335\\n\\nThe problem is that d_fsdata was not accessed under d_lock, because\\nd_release() normally is only called once the dentry is otherwise no\\nlonger accessible but since we also call it explicitly in v9fs_remove\\nthat lock is required:\\nmove the hlist out of the dentry under lock then unref its fids once\\nthey are no longer accessible.\"}, {\"lang\": \"es\", \"value\": \"En el kernel de Linux, se resolvi\\u00f3 la siguiente vulnerabilidad: 9p: agregar bloqueo faltante al tomar la lista de fid de dentry. Se corrigi\\u00f3 un use-after-free en la lista de fid d_fsdata de dentry cuando un subproceso busca un fid a trav\\u00e9s de dentry mientras otro subproceso lo desvincula: UAF hilo: refcount_t: suma en 0; use-after-free. p9_fid_get linux/./include/net/9p/client.h:262 v9fs_fid_find+0x236/0x280 linux/fs/9p/fid.c:129 v9fs_fid_lookup_with_uid linux/fs/9p/fid.c:181 v9fs_fid_lookup+0xbf/0xc20 Linux /fs/9p/fid.c:314 v9fs_vfs_getattr_dotl+0xf9/0x360 linux/fs/9p/vfs_inode_dotl.c:400 vfs_statx+0xdd/0x4d0 linux/fs/stat.c:248 Liberado por: p9_fid_destroy (en l\\u00ednea) desconocido+0xb0 /0xe0 linux/net/9p/client.c:1456 p9_fid_put linux/./include/net/9p/client.h:278 v9fs_dentry_release+0xb5/0x140 linux/fs/9p/vfs_dentry.c:55 v9fs_remove+0x38f/0x620 linux/fs/9p/vfs_inode.c:518 vfs_unlink+0x29a/0x810 linux/fs/namei.c:4335 El problema es que no se accedi\\u00f3 a d_fsdata bajo d_lock, porque normalmente d_release() solo se llama una vez que dentry no est\\u00e1 disponible. ya no es accesible, pero como tambi\\u00e9n lo llamamos expl\\u00edcitamente en v9fs_remove, ese bloqueo es necesario: mueva la hlist fuera del dentry bajo bloqueo y luego elimine la referencia de sus fids una vez que ya no sean accesibles.\"}]",
      "id": "CVE-2024-39463",
      "lastModified": "2024-11-21T09:27:43.050",
      "metrics": "{\"cvssMetricV31\": [{\"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:H/I:H/A:H\", \"baseScore\": 7.8, \"baseSeverity\": \"HIGH\", \"attackVector\": \"LOCAL\", \"attackComplexity\": \"LOW\", \"privilegesRequired\": \"LOW\", \"userInteraction\": \"NONE\", \"scope\": \"UNCHANGED\", \"confidentialityImpact\": \"HIGH\", \"integrityImpact\": \"HIGH\", \"availabilityImpact\": \"HIGH\"}, \"exploitabilityScore\": 1.8, \"impactScore\": 5.9}, {\"source\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"type\": \"Secondary\", \"cvssData\": {\"version\": \"3.1\", \"vectorString\": \"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H\", \"baseScore\": 7.8, \"baseSeverity\": \"HIGH\", \"attackVector\": \"LOCAL\", \"attackComplexity\": \"LOW\", \"privilegesRequired\": \"LOW\", \"userInteraction\": \"NONE\", \"scope\": \"UNCHANGED\", \"confidentialityImpact\": \"HIGH\", \"integrityImpact\": \"HIGH\", \"availabilityImpact\": \"HIGH\"}, \"exploitabilityScore\": 1.8, \"impactScore\": 5.9}]}",
      "published": "2024-06-25T15:15:14.760",
      "references": "[{\"url\": \"https://git.kernel.org/stable/c/3bb6763a8319170c2d41c4232c8e7e4c37dcacfb\", \"source\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}, {\"url\": \"https://git.kernel.org/stable/c/c898afdc15645efb555acb6d85b484eb40a45409\", \"source\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"tags\": [\"Patch\"]}, {\"url\": \"https://git.kernel.org/stable/c/cb299cdba09f46f090b843d78ba26b667d50a456\", \"source\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"tags\": [\"Patch\"]}, {\"url\": \"https://git.kernel.org/stable/c/f0c5c944c6d8614c19e6e9a97fd2011dcd30e8f5\", \"source\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"tags\": [\"Patch\"]}, {\"url\": \"https://git.kernel.org/stable/c/fe17ebf22feb4ad7094d597526d558a49aac92b4\", \"source\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"tags\": [\"Patch\"]}, {\"url\": \"https://www.zerodayinitiative.com/advisories/ZDI-24-1194/\", \"source\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}, {\"url\": \"https://git.kernel.org/stable/c/c898afdc15645efb555acb6d85b484eb40a45409\", \"source\": \"af854a3a-2127-422b-91ae-364da2661108\", \"tags\": [\"Patch\"]}, {\"url\": \"https://git.kernel.org/stable/c/cb299cdba09f46f090b843d78ba26b667d50a456\", \"source\": \"af854a3a-2127-422b-91ae-364da2661108\", \"tags\": [\"Patch\"]}, {\"url\": \"https://git.kernel.org/stable/c/f0c5c944c6d8614c19e6e9a97fd2011dcd30e8f5\", \"source\": \"af854a3a-2127-422b-91ae-364da2661108\", \"tags\": [\"Patch\"]}, {\"url\": \"https://git.kernel.org/stable/c/fe17ebf22feb4ad7094d597526d558a49aac92b4\", \"source\": \"af854a3a-2127-422b-91ae-364da2661108\", \"tags\": [\"Patch\"]}]",
      "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "vulnStatus": "Modified",
      "weaknesses": "[{\"source\": \"nvd@nist.gov\", \"type\": \"Primary\", \"description\": [{\"lang\": \"en\", \"value\": \"CWE-416\"}]}, {\"source\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"type\": \"Secondary\", \"description\": [{\"lang\": \"en\", \"value\": \"CWE-416\"}]}]"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2024-39463\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2024-06-25T15:15:14.760\",\"lastModified\":\"2026-01-06T15:06:42.260\",\"vulnStatus\":\"Analyzed\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\n9p: add missing locking around taking dentry fid list\\n\\nFix a use-after-free on dentry\u0027s d_fsdata fid list when a thread\\nlooks up a fid through dentry while another thread unlinks it:\\n\\nUAF thread:\\nrefcount_t: addition on 0; use-after-free.\\n p9_fid_get linux/./include/net/9p/client.h:262\\n v9fs_fid_find+0x236/0x280 linux/fs/9p/fid.c:129\\n v9fs_fid_lookup_with_uid linux/fs/9p/fid.c:181\\n v9fs_fid_lookup+0xbf/0xc20 linux/fs/9p/fid.c:314\\n v9fs_vfs_getattr_dotl+0xf9/0x360 linux/fs/9p/vfs_inode_dotl.c:400\\n vfs_statx+0xdd/0x4d0 linux/fs/stat.c:248\\n\\nFreed by:\\n p9_fid_destroy (inlined)\\n p9_client_clunk+0xb0/0xe0 linux/net/9p/client.c:1456\\n p9_fid_put linux/./include/net/9p/client.h:278\\n v9fs_dentry_release+0xb5/0x140 linux/fs/9p/vfs_dentry.c:55\\n v9fs_remove+0x38f/0x620 linux/fs/9p/vfs_inode.c:518\\n vfs_unlink+0x29a/0x810 linux/fs/namei.c:4335\\n\\nThe problem is that d_fsdata was not accessed under d_lock, because\\nd_release() normally is only called once the dentry is otherwise no\\nlonger accessible but since we also call it explicitly in v9fs_remove\\nthat lock is required:\\nmove the hlist out of the dentry under lock then unref its fids once\\nthey are no longer accessible.\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se resolvi\u00f3 la siguiente vulnerabilidad: 9p: agregar bloqueo faltante al tomar la lista de fid de dentry. Se corrigi\u00f3 un use-after-free en la lista de fid d_fsdata de dentry cuando un subproceso busca un fid a trav\u00e9s de dentry mientras otro subproceso lo desvincula: UAF hilo: refcount_t: suma en 0; use-after-free. p9_fid_get linux/./include/net/9p/client.h:262 v9fs_fid_find+0x236/0x280 linux/fs/9p/fid.c:129 v9fs_fid_lookup_with_uid linux/fs/9p/fid.c:181 v9fs_fid_lookup+0xbf/0xc20 Linux /fs/9p/fid.c:314 v9fs_vfs_getattr_dotl+0xf9/0x360 linux/fs/9p/vfs_inode_dotl.c:400 vfs_statx+0xdd/0x4d0 linux/fs/stat.c:248 Liberado por: p9_fid_destroy (en l\u00ednea) desconocido+0xb0 /0xe0 linux/net/9p/client.c:1456 p9_fid_put linux/./include/net/9p/client.h:278 v9fs_dentry_release+0xb5/0x140 linux/fs/9p/vfs_dentry.c:55 v9fs_remove+0x38f/0x620 linux/fs/9p/vfs_inode.c:518 vfs_unlink+0x29a/0x810 linux/fs/namei.c:4335 El problema es que no se accedi\u00f3 a d_fsdata bajo d_lock, porque normalmente d_release() solo se llama una vez que dentry no est\u00e1 disponible. ya no es accesible, pero como tambi\u00e9n lo llamamos expl\u00edcitamente en v9fs_remove, ese bloqueo es necesario: mueva la hlist fuera del dentry bajo bloqueo y luego elimine la referencia de sus fids una vez que ya no sean accesibles.\"}],\"metrics\":{\"cvssMetricV31\":[{\"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:H/I:H/A:H\",\"baseScore\":7.8,\"baseSeverity\":\"HIGH\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"HIGH\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.8,\"impactScore\":5.9},{\"source\":\"134c704f-9b21-4f2e-91b3-4a467353bcc0\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H\",\"baseScore\":7.8,\"baseSeverity\":\"HIGH\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"HIGH\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.8,\"impactScore\":5.9}]},\"weaknesses\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-416\"}]},{\"source\":\"134c704f-9b21-4f2e-91b3-4a467353bcc0\",\"type\":\"Secondary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-416\"}]}],\"configurations\":[{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.11\",\"versionEndExcluding\":\"5.15.168\",\"matchCriteriaId\":\"4D51C05D-455B-4D8D-89E7-A58E140B864C\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.16\",\"versionEndExcluding\":\"6.1.94\",\"matchCriteriaId\":\"9D20DE32-76F8-4E4C-A8DF-5B53082D18E5\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.2\",\"versionEndExcluding\":\"6.6.34\",\"matchCriteriaId\":\"6BD9DCFD-0342-4039-B8CE-70F26DB7173B\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.7\",\"versionEndExcluding\":\"6.9.5\",\"matchCriteriaId\":\"8366481F-770F-4850-9D0F-2977BD97D5C5\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:6.10:rc1:*:*:*:*:*:*\",\"matchCriteriaId\":\"2EBB4392-5FA6-4DA9-9772-8F9C750109FA\"}]}]}],\"references\":[{\"url\":\"https://git.kernel.org/stable/c/3bb6763a8319170c2d41c4232c8e7e4c37dcacfb\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/c898afdc15645efb555acb6d85b484eb40a45409\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/cb299cdba09f46f090b843d78ba26b667d50a456\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/f0c5c944c6d8614c19e6e9a97fd2011dcd30e8f5\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/fe17ebf22feb4ad7094d597526d558a49aac92b4\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://www.zerodayinitiative.com/advisories/ZDI-24-1194/\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Third Party Advisory\"]},{\"url\":\"https://git.kernel.org/stable/c/c898afdc15645efb555acb6d85b484eb40a45409\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/cb299cdba09f46f090b843d78ba26b667d50a456\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/f0c5c944c6d8614c19e6e9a97fd2011dcd30e8f5\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/fe17ebf22feb4ad7094d597526d558a49aac92b4\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Patch\"]}]}}",
    "vulnrichment": {
      "containers": "{\"adp\": [{\"title\": \"CVE Program Container\", \"references\": [{\"url\": \"https://git.kernel.org/stable/c/cb299cdba09f46f090b843d78ba26b667d50a456\", \"tags\": [\"x_transferred\"]}, {\"url\": \"https://git.kernel.org/stable/c/f0c5c944c6d8614c19e6e9a97fd2011dcd30e8f5\", \"tags\": [\"x_transferred\"]}, {\"url\": \"https://git.kernel.org/stable/c/fe17ebf22feb4ad7094d597526d558a49aac92b4\", \"tags\": [\"x_transferred\"]}, {\"url\": \"https://git.kernel.org/stable/c/c898afdc15645efb555acb6d85b484eb40a45409\", \"tags\": [\"x_transferred\"]}], \"providerMetadata\": {\"orgId\": \"af854a3a-2127-422b-91ae-364da2661108\", \"shortName\": \"CVE\", \"dateUpdated\": \"2024-08-02T04:26:15.245Z\"}}, {\"title\": \"CISA ADP Vulnrichment\", \"metrics\": [{\"cvssV3_1\": {\"scope\": \"UNCHANGED\", \"version\": \"3.1\", \"baseScore\": 7.8, \"attackVector\": \"LOCAL\", \"baseSeverity\": \"HIGH\", \"vectorString\": \"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H\", \"integrityImpact\": \"HIGH\", \"userInteraction\": \"NONE\", \"attackComplexity\": \"LOW\", \"availabilityImpact\": \"HIGH\", \"privilegesRequired\": \"LOW\", \"confidentialityImpact\": \"HIGH\"}}, {\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2024-39463\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"none\"}, {\"Automatable\": \"no\"}, {\"Technical Impact\": \"total\"}], \"version\": \"2.0.3\", \"timestamp\": \"2024-09-10T03:55:21.281977Z\"}}}], \"affected\": [{\"cpes\": [\"cpe:2.3:o:linux:linux_kernel:5.11:*:*:*:*:*:*:*\"], \"vendor\": \"linux\", \"product\": \"linux_kernel\", \"versions\": [{\"status\": \"affected\", \"version\": \"5.11\"}], \"defaultStatus\": \"affected\"}, {\"cpes\": [\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\"], \"vendor\": \"linux\", \"product\": \"linux_kernel\", \"versions\": [{\"status\": \"affected\", \"version\": \"154372e67d40\", \"lessThan\": \"cb299cdba09f\", \"versionType\": \"custom\"}, {\"status\": \"affected\", \"version\": \"154372e67d40\", \"lessThan\": \"f0c5c944c6d8\", \"versionType\": \"custom\"}, {\"status\": \"affected\", \"version\": \"154372e67d40\", \"lessThan\": \"fe17ebf22feb\", \"versionType\": \"custom\"}, {\"status\": \"affected\", \"version\": \"154372e67d40\", \"lessThan\": \"c898afdc1564\", \"versionType\": \"custom\"}], \"defaultStatus\": \"unaffected\"}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-416\", \"description\": \"CWE-416 Use After Free\"}]}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2024-09-10T15:33:58.445Z\"}}], \"cna\": {\"title\": \"9p: add missing locking around taking dentry fid list\", \"affected\": [{\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"154372e67d4053e56591245eb413686621941333\", \"lessThan\": \"3bb6763a8319170c2d41c4232c8e7e4c37dcacfb\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"154372e67d4053e56591245eb413686621941333\", \"lessThan\": \"cb299cdba09f46f090b843d78ba26b667d50a456\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"154372e67d4053e56591245eb413686621941333\", \"lessThan\": \"f0c5c944c6d8614c19e6e9a97fd2011dcd30e8f5\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"154372e67d4053e56591245eb413686621941333\", \"lessThan\": \"fe17ebf22feb4ad7094d597526d558a49aac92b4\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"154372e67d4053e56591245eb413686621941333\", \"lessThan\": \"c898afdc15645efb555acb6d85b484eb40a45409\", \"versionType\": \"git\"}], \"programFiles\": [\"fs/9p/vfs_dentry.c\"], \"defaultStatus\": \"unaffected\"}, {\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"5.11\"}, {\"status\": \"unaffected\", \"version\": \"0\", \"lessThan\": \"5.11\", \"versionType\": \"semver\"}, {\"status\": \"unaffected\", \"version\": \"5.15.168\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.15.*\"}, {\"status\": \"unaffected\", \"version\": \"6.1.94\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.1.*\"}, {\"status\": \"unaffected\", \"version\": \"6.6.34\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.6.*\"}, {\"status\": \"unaffected\", \"version\": \"6.9.5\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.9.*\"}, {\"status\": \"unaffected\", \"version\": \"6.10\", \"versionType\": \"original_commit_for_fix\", \"lessThanOrEqual\": \"*\"}], \"programFiles\": [\"fs/9p/vfs_dentry.c\"], \"defaultStatus\": \"affected\"}], \"references\": [{\"url\": \"https://git.kernel.org/stable/c/3bb6763a8319170c2d41c4232c8e7e4c37dcacfb\"}, {\"url\": \"https://git.kernel.org/stable/c/cb299cdba09f46f090b843d78ba26b667d50a456\"}, {\"url\": \"https://git.kernel.org/stable/c/f0c5c944c6d8614c19e6e9a97fd2011dcd30e8f5\"}, {\"url\": \"https://git.kernel.org/stable/c/fe17ebf22feb4ad7094d597526d558a49aac92b4\"}, {\"url\": \"https://git.kernel.org/stable/c/c898afdc15645efb555acb6d85b484eb40a45409\"}, {\"url\": \"https://www.zerodayinitiative.com/advisories/ZDI-24-1194/\"}], \"x_generator\": {\"engine\": \"bippy-5f407fcff5a0\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"In the Linux kernel, the following vulnerability has been resolved:\\n\\n9p: add missing locking around taking dentry fid list\\n\\nFix a use-after-free on dentry\u0027s d_fsdata fid list when a thread\\nlooks up a fid through dentry while another thread unlinks it:\\n\\nUAF thread:\\nrefcount_t: addition on 0; use-after-free.\\n p9_fid_get linux/./include/net/9p/client.h:262\\n v9fs_fid_find+0x236/0x280 linux/fs/9p/fid.c:129\\n v9fs_fid_lookup_with_uid linux/fs/9p/fid.c:181\\n v9fs_fid_lookup+0xbf/0xc20 linux/fs/9p/fid.c:314\\n v9fs_vfs_getattr_dotl+0xf9/0x360 linux/fs/9p/vfs_inode_dotl.c:400\\n vfs_statx+0xdd/0x4d0 linux/fs/stat.c:248\\n\\nFreed by:\\n p9_fid_destroy (inlined)\\n p9_client_clunk+0xb0/0xe0 linux/net/9p/client.c:1456\\n p9_fid_put linux/./include/net/9p/client.h:278\\n v9fs_dentry_release+0xb5/0x140 linux/fs/9p/vfs_dentry.c:55\\n v9fs_remove+0x38f/0x620 linux/fs/9p/vfs_inode.c:518\\n vfs_unlink+0x29a/0x810 linux/fs/namei.c:4335\\n\\nThe problem is that d_fsdata was not accessed under d_lock, because\\nd_release() normally is only called once the dentry is otherwise no\\nlonger accessible but since we also call it explicitly in v9fs_remove\\nthat lock is required:\\nmove the hlist out of the dentry under lock then unref its fids once\\nthey are no longer accessible.\"}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2024-12-19T09:06:38.774Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2024-39463\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2024-12-19T09:06:38.774Z\", \"dateReserved\": \"2024-06-25T14:23:23.744Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2024-06-25T14:25:02.887Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.1"
    }
  }
}