Vulnerability-Lookup

GHSA-PRJ2-H762-9J59

Vulnerability from github – Published: 2024-09-13 06:30 – Updated: 2024-09-19 18:30

Details

In the Linux kernel, the following vulnerability has been resolved:

nfsd: ensure that nfsd4_fattr_args.context is zeroed out

If nfsd4_encode_fattr4 ends up doing a "goto out" before we get to checking for the security label, then args.context will be set to uninitialized junk on the stack, which we'll then try to free. Initialize it early.

Severity

5.5 (Medium)


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

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{
  "affected": [],
  "aliases": [
    "CVE-2024-46697"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-665"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2024-09-13T06:15:14Z",
    "severity": "MODERATE"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nnfsd: ensure that nfsd4_fattr_args.context is zeroed out\n\nIf nfsd4_encode_fattr4 ends up doing a \"goto out\" before we get to\nchecking for the security label, then args.context will be set to\nuninitialized junk on the stack, which we\u0027ll then try to free.\nInitialize it early.",
  "id": "GHSA-prj2-h762-9j59",
  "modified": "2024-09-19T18:30:51Z",
  "published": "2024-09-13T06:30:43Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2024-46697"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/dd65b324174a64558a16ebbf4c3266e5701185d0"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/f58bab6fd4063913bd8321e99874b8239e9ba726"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    }
  ]
}

CVE-2024-46697 (GCVE-0-2024-46697)

Vulnerability from cvelistv5 – Published: 2024-09-13 05:29 – Updated: 2026-08-05 11:38

Title

nfsd: ensure that nfsd4_fattr_args.context is zeroed out

Summary

In the Linux kernel, the following vulnerability has been resolved: nfsd: ensure that nfsd4_fattr_args.context is zeroed out If nfsd4_encode_fattr4 ends up doing a "goto out" before we get to checking for the security label, then args.context will be set to uninitialized junk on the stack, which we'll then try to free. Initialize it early.

Severity

9.8 (Critical)


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

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2024-09-29 15:05 UTC

Assigner

Linux CNA under the mitre root

CNA scorecard D 53/100 over 6637 records in the last 180 days details

References

2 references

URL	Tags
https://git.kernel.org/stable/c/dd65b324174a64558…
https://git.kernel.org/stable/c/f58bab6fd4063913b…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: f59388a579c6a395de8f7372b267d3abecd8d6bf , < dd65b324174a64558a16ebbf4c3266e5701185d0 (git) Affected: f59388a579c6a395de8f7372b267d3abecd8d6bf , < f58bab6fd4063913bd8321e99874b8239e9ba726 (git)
Linux	Linux	Affected: 6.7 Unaffected: 0 , < 6.7 (semver) Unaffected: 6.10.8 , ≤ 6.10.* (semver) Unaffected: 6.11 , ≤ * (original_commit_for_fix)

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JSON

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{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2024-46697",
                "options": [
                  {
                    "Exploitation": "none"
                  },
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                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2024-09-29T15:05:16.231611Z",
                "version": "2.0.3"
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          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
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          "product": "Linux",
          "programFiles": [
            "fs/nfsd/nfs4xdr.c"
          ],
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          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "dd65b324174a64558a16ebbf4c3266e5701185d0",
              "status": "affected",
              "version": "f59388a579c6a395de8f7372b267d3abecd8d6bf",
              "versionType": "git"
            },
            {
              "lessThan": "f58bab6fd4063913bd8321e99874b8239e9ba726",
              "status": "affected",
              "version": "f59388a579c6a395de8f7372b267d3abecd8d6bf",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "fs/nfsd/nfs4xdr.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"
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              "status": "unaffected",
              "version": "6.10.8",
              "versionType": "semver"
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              "status": "unaffected",
              "version": "6.11",
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                  "versionStartIncluding": "6.7",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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                  "versionStartIncluding": "6.7",
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                }
              ],
              "negate": false,
              "operator": "OR"
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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnfsd: ensure that nfsd4_fattr_args.context is zeroed out\n\nIf nfsd4_encode_fattr4 ends up doing a \"goto out\" before we get to\nchecking for the security label, then args.context will be set to\nuninitialized junk on the stack, which we\u0027ll then try to free.\nInitialize it early."
        }
      ],
      "metrics": [
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            "baseSeverity": "CRITICAL",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:N - The vulnerable code is the NFSv4 attribute encoder in the in-kernel NFS server, reached directly from GETATTR/READDIR/OPEN operations in a client-supplied COMPOUND over TCP port 2049. No local access is needed \u2014 an attacker acting as an NFS client on the network drives the entire path.\nAC:L - The attacker controls every input needed: the requested attribute bitmap (FATTR4_WORD0_CHANGE/SIZE/ACL/FILEHANDLE) and the condition that forces the early exit, e.g. holding a write delegation and deliberately stalling the CB_GETATTR callback so nfsd4_deleg_getattr_conflict returns nfserr_jukebox, and the operation can be repeated indefinitely. CONFIG_NFSD_V4_SECURITY_LABEL is enabled by all major distributions, so no rare configuration is required.\nPR:N - Reaching nfsd4_encode_fattr4 needs only a filehandle obtained via PUTROOTFH/LOOKUP or PUTFH on an accessible export; with the ubiquitous sec=sys (AUTH_SYS) flavor there is no cryptographic authentication at all \u2014 the client simply asserts a uid, so a remote unauthenticated peer permitted by the export list can issue the triggering GETATTR/READDIR.\nUI:N - The attacker issues the NFSv4 COMPOUND requests and holds the conflicting delegation entirely on its own. No action by any administrator or other user on the server is required.\nS:U - The bad free corrupts the kernel\u0027s own slab allocator within the same security authority as the nfsd thread. No VM, IOMMU, or sandbox boundary is crossed.\nC:H - Freeing an uninitialized pointer \u2014 and in the READDIR loop, double-freeing an already-released SELinux context buffer that another allocation now owns \u2014 yields a use-after-free giving the attacker a stale reference to live kernel objects, which is the standard primitive for disclosing arbitrary kernel memory. The stack slot is also attacker-groomable via the preceding COMPOUND operations, making the freed target selectable.\nI:H - An arbitrary/double free is a full memory-corruption primitive: the reclaimed slab object can be sprayed with attacker-chosen data from concurrent NFS requests, producing a write primitive and control-flow hijack in kernel context. This is at least as strong as a plain use-after-free, which is scored High.\nA:H - kfree() on arbitrary uninitialized stack residue \u2014 a stack pointer, a non-slab address, or an already-freed object \u2014 triggers slab corruption, a BUG in the allocator, or an oops in the nfsd kthread, panicking the server. The trigger is repeatable at will, so an attacker can reliably take the NFS server down."
            }
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        }
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        "dateUpdated": "2026-08-05T11:38:02.067Z",
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        {
          "url": "https://git.kernel.org/stable/c/f58bab6fd4063913bd8321e99874b8239e9ba726"
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      ],
      "title": "nfsd: ensure that nfsd4_fattr_args.context is zeroed out",
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    "datePublished": "2024-09-13T05:29:24.787Z",
    "dateReserved": "2024-09-11T15:12:18.250Z",
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    "state": "PUBLISHED"
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}

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.

Vulnerability timeline

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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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