Vulnerability-Lookup

FKIE_CVE-2026-97584

Vulnerability from fkie_nvd - Published: 2026-09-25 11:17 - Updated: 2026-09-25 15:18

Severity

7.8 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Summary

In the Linux kernel, the following vulnerability has been resolved: afs: Fix incorrect free in candidate cleanup in afs_lookup_server() Fix afs_lookup_server() to not free an existing server's endpoint state when cleaning up a candidate server. The candidate record doesn't have an endpoint state yet at this point, so the free for that can just be removed.

References

	URL	Tags
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/044d596094af4b769fb8e1173dff0d08bd68db6c
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/349e713039a1fd6659c27e7a66238bfa49ce37e9
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/981d72663dee2fa6efaf202293e68d2b10a0d1d4
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/e5bc0fa9959dc8f7eb1afab7c039594a16a1a65c

Impacted products

	Vendor	Product	Version

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "fs/afs/server.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "981d72663dee2fa6efaf202293e68d2b10a0d1d4",
              "status": "affected",
              "version": "d6aa05cd995830f6dcee7b139335edb266de38a6",
              "versionType": "git"
            },
            {
              "lessThan": "e5bc0fa9959dc8f7eb1afab7c039594a16a1a65c",
              "status": "affected",
              "version": "4882ba78574e2d8c579658f65f6784b0d139d173",
              "versionType": "git"
            },
            {
              "lessThan": "349e713039a1fd6659c27e7a66238bfa49ce37e9",
              "status": "affected",
              "version": "4882ba78574e2d8c579658f65f6784b0d139d173",
              "versionType": "git"
            },
            {
              "lessThan": "044d596094af4b769fb8e1173dff0d08bd68db6c",
              "status": "affected",
              "version": "4882ba78574e2d8c579658f65f6784b0d139d173",
              "versionType": "git"
            },
            {
              "lessThan": "6.12.111",
              "status": "affected",
              "version": "6.12.101",
              "versionType": "semver"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "fs/afs/server.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.15"
            },
            {
              "lessThan": "6.15",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.111",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.53",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.2.*",
              "status": "unaffected",
              "version": "7.2.7",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.3-rc3",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nafs: Fix incorrect free in candidate cleanup in afs_lookup_server()\n\nFix afs_lookup_server() to not free an existing server\u0027s endpoint state\nwhen cleaning up a candidate server.  The candidate record doesn\u0027t have an\nendpoint state yet at this point, so the free for that can just be removed."
    }
  ],
  "id": "CVE-2026-97584",
  "lastModified": "2026-09-25T15:18:00.430",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "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"
        },
        "exploitabilityScore": 1.8,
        "impactScore": 5.9,
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "type": "Secondary"
      }
    ]
  },
  "published": "2026-09-25T11:17:09.267",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/044d596094af4b769fb8e1173dff0d08bd68db6c"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/349e713039a1fd6659c27e7a66238bfa49ce37e9"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/981d72663dee2fa6efaf202293e68d2b10a0d1d4"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/e5bc0fa9959dc8f7eb1afab7c039594a16a1a65c"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Received"
}

CVE-2026-97584 (GCVE-0-2026-97584)

Vulnerability from cvelistv5 – Published: 2026-09-25 10:22 – Updated: 2026-09-25 14:41

Title

afs: Fix incorrect free in candidate cleanup in afs_lookup_server()

Summary

Severity

7.8 (High)


                        
                          CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Assigner

Linux mitre root

References

4 references

URL	Tags
https://git.kernel.org/stable/c/981d72663dee2fa6e…
https://git.kernel.org/stable/c/e5bc0fa9959dc8f7e…
https://git.kernel.org/stable/c/349e713039a1fd665…
https://git.kernel.org/stable/c/044d596094af4b769…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: d6aa05cd995830f6dcee7b139335edb266de38a6 , < 981d72663dee2fa6efaf202293e68d2b10a0d1d4 (git) Affected: 4882ba78574e2d8c579658f65f6784b0d139d173 , < e5bc0fa9959dc8f7eb1afab7c039594a16a1a65c (git) Affected: 4882ba78574e2d8c579658f65f6784b0d139d173 , < 349e713039a1fd6659c27e7a66238bfa49ce37e9 (git) Affected: 4882ba78574e2d8c579658f65f6784b0d139d173 , < 044d596094af4b769fb8e1173dff0d08bd68db6c (git) Affected: 6.12.101 , < 6.12.111 (semver)
Linux	Linux	Affected: 6.15 Unaffected: 0 , < 6.15 (semver) Unaffected: 6.12.111 , ≤ 6.12.* (semver) Unaffected: 6.18.53 , ≤ 6.18.* (semver) Unaffected: 7.2.7 , ≤ 7.2.* (semver) Unaffected: 7.3-rc3 , ≤ * (original_commit_for_fix)

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "fs/afs/server.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "981d72663dee2fa6efaf202293e68d2b10a0d1d4",
              "status": "affected",
              "version": "d6aa05cd995830f6dcee7b139335edb266de38a6",
              "versionType": "git"
            },
            {
              "lessThan": "e5bc0fa9959dc8f7eb1afab7c039594a16a1a65c",
              "status": "affected",
              "version": "4882ba78574e2d8c579658f65f6784b0d139d173",
              "versionType": "git"
            },
            {
              "lessThan": "349e713039a1fd6659c27e7a66238bfa49ce37e9",
              "status": "affected",
              "version": "4882ba78574e2d8c579658f65f6784b0d139d173",
              "versionType": "git"
            },
            {
              "lessThan": "044d596094af4b769fb8e1173dff0d08bd68db6c",
              "status": "affected",
              "version": "4882ba78574e2d8c579658f65f6784b0d139d173",
              "versionType": "git"
            },
            {
              "lessThan": "6.12.111",
              "status": "affected",
              "version": "6.12.101",
              "versionType": "semver"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "fs/afs/server.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.15"
            },
            {
              "lessThan": "6.15",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.111",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.53",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.2.*",
              "status": "unaffected",
              "version": "7.2.7",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.3-rc3",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.111",
                  "versionStartIncluding": "6.12.101",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.53",
                  "versionStartIncluding": "6.15",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.2.7",
                  "versionStartIncluding": "6.15",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.3-rc3",
                  "versionStartIncluding": "6.15",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nafs: Fix incorrect free in candidate cleanup in afs_lookup_server()\n\nFix afs_lookup_server() to not free an existing server\u0027s endpoint state\nwhen cleaning up a candidate server.  The candidate record doesn\u0027t have an\nendpoint state yet at this point, so the free for that can just be removed."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 7.8,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:L - afs_lookup_server() is reached through afs_create_volume()/afs_update_volume_state() -\u003e afs_alloc_server_list() when a local process walks a kAFS path (for example /afs/\u003ccell\u003e/\u003cvol\u003e automount) or uses a volume. Nothing malformed comes off the wire. The defect is local cleanup logic that frees the wrong object, so the attacker needs a local account on the AFS client.\nAC:L - The candidate is left non-NULL when afs_install_server() returns an existing record. That happens when the attacker runs parallel lookups of volumes on the same fileserver UUID, or accesses the path again after a creation attempt failed and left the record marked UNCREATED. Both states come from the attacker\u0027s own path accesses; neither depends on outside conditions.\nPR:L - Mounting kAFS needs CAP_SYS_ADMIN (no FS_USERNS_MOUNT). On a client that already has the /afs dynroot mounted, any unprivileged user can start the volume and server lookups that reach afs_lookup_server() just by accessing /afs/\u003ccell\u003e/... paths.\nUI:N - No victim action is needed; the attacker triggers the lookups and the faulty cleanup with their own filesystem accesses.\nS:U - The memory corruption stays inside the kernel\u0027s own security authority; no VM, IOMMU or sandbox boundary is crossed.\nC:H - The cleanup at the out: label kfree()s the existing server\u0027s live, refcounted afs_endpoint_state. server-\u003eendpoint_state and in-flight probe/rotate operations still reference it, giving a use-after-free of a sprayable kmalloc object that can be reclaimed to leak kernel data.\nI:H - After the bad kfree(), afs_put_endpoint_state() and the probe code keep writing refcounts, flags and the addresses pointer into the freed estate. When the refcount later drops to zero it is freed a second time via call_rcu, so a reclaimed object gets corrupted.\nA:H - The freed estate is later used and double-freed, and on the create_failed and wait_for_creation failure paths `server` is NULL when server-\u003eendpoint_state is read. Either way the kernel oopses or panics."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-09-25T14:41:25.662Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/981d72663dee2fa6efaf202293e68d2b10a0d1d4"
        },
        {
          "url": "https://git.kernel.org/stable/c/e5bc0fa9959dc8f7eb1afab7c039594a16a1a65c"
        },
        {
          "url": "https://git.kernel.org/stable/c/349e713039a1fd6659c27e7a66238bfa49ce37e9"
        },
        {
          "url": "https://git.kernel.org/stable/c/044d596094af4b769fb8e1173dff0d08bd68db6c"
        }
      ],
      "title": "afs: Fix incorrect free in candidate cleanup in afs_lookup_server()",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-97584",
    "datePublished": "2026-09-25T10:22:04.322Z",
    "dateReserved": "2026-09-24T16:01:01.156Z",
    "dateUpdated": "2026-09-25T14:41:25.662Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

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.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
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FKIE_CVE-2026-97584

CVE-2026-97584 (GCVE-0-2026-97584)

Tags

Sightings

Nomenclature

Related by attack behaviour