github - ghsa-24mf-qj78-vm87

GHSA-24MF-QJ78-VM87

Vulnerability from github – Published: 2024-12-29 12:30 – Updated: 2025-01-08 00:30

Details

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

nfs/localio: must clear res.replen in nfs_local_read_done

Otherwise memory corruption can occur due to NFSv3 LOCALIO reads leaving garbage in res.replen: - nfs3_read_done() copies that into server->read_hdrsize; from there nfs3_proc_read_setup() copies it to args.replen in new requests. - nfs3_xdr_enc_read3args() passes that to rpc_prepare_reply_pages() which includes it in hdrsize for xdr_init_pages, so that rq_rcv_buf contains a ridiculous len. - This is copied to rq_private_buf and xs_read_stream_request() eventually passes the kvec to sock_recvmsg() which receives incoming data into entirely the wrong place.

This is easily reproduced with NFSv3 LOCALIO that is servicing reads when it is made to pivot back to using normal RPC. This switch back to using normal NFSv3 with RPC can occur for a few reasons but this issue was exposed with a test that stops and then restarts the NFSv3 server while LOCALIO is performing heavy read IO.

Severity ?

7.8 (High)


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

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{
  "affected": [],
  "aliases": [
    "CVE-2024-56740"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-787"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2024-12-29T12:15:07Z",
    "severity": "HIGH"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nnfs/localio: must clear res.replen in nfs_local_read_done\n\nOtherwise memory corruption can occur due to NFSv3 LOCALIO reads\nleaving garbage in res.replen:\n- nfs3_read_done() copies that into server-\u003eread_hdrsize; from there\n  nfs3_proc_read_setup() copies it to args.replen in new requests.\n- nfs3_xdr_enc_read3args() passes that to rpc_prepare_reply_pages()\n  which includes it in hdrsize for xdr_init_pages, so that rq_rcv_buf\n  contains a ridiculous len.\n- This is copied to rq_private_buf and xs_read_stream_request()\n  eventually passes the kvec to sock_recvmsg() which receives incoming\n  data into entirely the wrong place.\n\nThis is easily reproduced with NFSv3 LOCALIO that is servicing reads\nwhen it is made to pivot back to using normal RPC.  This switch back\nto using normal NFSv3 with RPC can occur for a few reasons but this\nissue was exposed with a test that stops and then restarts the NFSv3\nserver while LOCALIO is performing heavy read IO.",
  "id": "GHSA-24mf-qj78-vm87",
  "modified": "2025-01-08T00:30:48Z",
  "published": "2024-12-29T12:30:40Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2024-56740"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/650703bc4ed3edf841e851c99ab8e7ba9e5262a3"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/de5dac261eeab99762bbdf7c20cee5d26ef4462e"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ]
}

CVE-2024-56740 (GCVE-0-2024-56740)

Vulnerability from cvelistv5 – Published: 2024-12-29 11:30 – Updated: 2025-10-01 20:07

Summary

In the Linux kernel, the following vulnerability has been resolved: nfs/localio: must clear res.replen in nfs_local_read_done Otherwise memory corruption can occur due to NFSv3 LOCALIO reads leaving garbage in res.replen: - nfs3_read_done() copies that into server->read_hdrsize; from there nfs3_proc_read_setup() copies it to args.replen in new requests. - nfs3_xdr_enc_read3args() passes that to rpc_prepare_reply_pages() which includes it in hdrsize for xdr_init_pages, so that rq_rcv_buf contains a ridiculous len. - This is copied to rq_private_buf and xs_read_stream_request() eventually passes the kvec to sock_recvmsg() which receives incoming data into entirely the wrong place. This is easily reproduced with NFSv3 LOCALIO that is servicing reads when it is made to pivot back to using normal RPC. This switch back to using normal NFSv3 with RPC can occur for a few reasons but this issue was exposed with a test that stops and then restarts the NFSv3 server while LOCALIO is performing heavy read IO.

Severity ?

7.8 (High)


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

CWE

CWE-787 - Out-of-bounds Write

Assigner

Linux

References

URL

Tags

	https://git.kernel.org/stable/c/de5dac261eeab9976…
	https://git.kernel.org/stable/c/650703bc4ed3edf84…

Impacted products

Vendor

Product

Version

Linux

Affected: 70ba381e1a431245c137ed597ec6a05991c79bd9 , < de5dac261eeab99762bbdf7c20cee5d26ef4462e (git)
Affected: 70ba381e1a431245c137ed597ec6a05991c79bd9 , < 650703bc4ed3edf841e851c99ab8e7ba9e5262a3 (git)

Linux

Affected: 6.12
Unaffected: 0 , < 6.12 (semver)
Unaffected: 6.12.2 , ≤ 6.12.* (semver)
Unaffected: 6.13 , ≤ * (original_commit_for_fix)

Show details on NVD website

JSON

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{
  "containers": {
    "adp": [
      {
        "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-2024-56740",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "total"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2025-10-01T19:57:38.126609Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "problemTypes": [
          {
            "descriptions": [
              {
                "cweId": "CWE-787",
                "description": "CWE-787 Out-of-bounds Write",
                "lang": "en",
                "type": "CWE"
              }
            ]
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2025-10-01T20:07:04.078Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
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        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
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          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "fs/nfs/localio.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
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              "lessThan": "de5dac261eeab99762bbdf7c20cee5d26ef4462e",
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              "version": "70ba381e1a431245c137ed597ec6a05991c79bd9",
              "versionType": "git"
            },
            {
              "lessThan": "650703bc4ed3edf841e851c99ab8e7ba9e5262a3",
              "status": "affected",
              "version": "70ba381e1a431245c137ed597ec6a05991c79bd9",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "fs/nfs/localio.c"
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          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.12"
            },
            {
              "lessThan": "6.12",
              "status": "unaffected",
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            },
            {
              "lessThanOrEqual": "6.12.*",
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              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "6.13",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.2",
                  "versionStartIncluding": "6.12",
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnfs/localio: must clear res.replen in nfs_local_read_done\n\nOtherwise memory corruption can occur due to NFSv3 LOCALIO reads\nleaving garbage in res.replen:\n- nfs3_read_done() copies that into server-\u003eread_hdrsize; from there\n  nfs3_proc_read_setup() copies it to args.replen in new requests.\n- nfs3_xdr_enc_read3args() passes that to rpc_prepare_reply_pages()\n  which includes it in hdrsize for xdr_init_pages, so that rq_rcv_buf\n  contains a ridiculous len.\n- This is copied to rq_private_buf and xs_read_stream_request()\n  eventually passes the kvec to sock_recvmsg() which receives incoming\n  data into entirely the wrong place.\n\nThis is easily reproduced with NFSv3 LOCALIO that is servicing reads\nwhen it is made to pivot back to using normal RPC.  This switch back\nto using normal NFSv3 with RPC can occur for a few reasons but this\nissue was exposed with a test that stops and then restarts the NFSv3\nserver while LOCALIO is performing heavy read IO."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2025-05-04T10:03:37.933Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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      "references": [
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          "url": "https://git.kernel.org/stable/c/de5dac261eeab99762bbdf7c20cee5d26ef4462e"
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        {
          "url": "https://git.kernel.org/stable/c/650703bc4ed3edf841e851c99ab8e7ba9e5262a3"
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      ],
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  "cveMetadata": {
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    "assignerShortName": "Linux",
    "cveId": "CVE-2024-56740",
    "datePublished": "2024-12-29T11:30:09.180Z",
    "dateReserved": "2024-12-29T11:26:39.757Z",
    "dateUpdated": "2025-10-01T20:07:04.078Z",
    "state": "PUBLISHED"
  },
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  "dataVersion": "5.1"
}

Sightings

Author	Source	Type	Date

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.

Action not permitted

GHSA-24MF-QJ78-VM87

CVE-2024-56740 (GCVE-0-2024-56740)

Tags

Sightings

Nomenclature