csaf_certbund - wid-sec-w-2024-3399

WID-SEC-W-2024-3399

Vulnerability from csaf_certbund - Published: 2024-11-11 23:00 - Updated: 2025-05-26 22:00

Summary

Linux Kernel: Schwachstelle ermöglicht Denial of Service

Notes

Das BSI ist als Anbieter für die eigenen, zur Nutzung bereitgestellten Inhalte nach den allgemeinen Gesetzen verantwortlich. Nutzerinnen und Nutzer sind jedoch dafür verantwortlich, die Verwendung und/oder die Umsetzung der mit den Inhalten bereitgestellten Informationen sorgfältig im Einzelfall zu prüfen.

Produktbeschreibung

Der Kernel stellt den Kern des Linux Betriebssystems dar.

Angriff

Ein lokaler Angreifer kann eine Schwachstelle im Linux Kernel ausnutzen, um einen Denial of Service Angriff durchzuführen.

Betroffene Betriebssysteme

- Linux

JSON

To clipboard

{
  "document": {
    "aggregate_severity": {
      "text": "niedrig"
    },
    "category": "csaf_base",
    "csaf_version": "2.0",
    "distribution": {
      "tlp": {
        "label": "WHITE",
        "url": "https://www.first.org/tlp/"
      }
    },
    "lang": "de-DE",
    "notes": [
      {
        "category": "legal_disclaimer",
        "text": "Das BSI ist als Anbieter f\u00fcr die eigenen, zur Nutzung bereitgestellten Inhalte nach den allgemeinen Gesetzen verantwortlich. Nutzerinnen und Nutzer sind jedoch daf\u00fcr verantwortlich, die Verwendung und/oder die Umsetzung der mit den Inhalten bereitgestellten Informationen sorgf\u00e4ltig im Einzelfall zu pr\u00fcfen."
      },
      {
        "category": "description",
        "text": "Der Kernel stellt den Kern des Linux Betriebssystems dar.",
        "title": "Produktbeschreibung"
      },
      {
        "category": "summary",
        "text": "Ein lokaler Angreifer kann eine Schwachstelle im Linux Kernel ausnutzen, um einen Denial of Service Angriff durchzuf\u00fchren.",
        "title": "Angriff"
      },
      {
        "category": "general",
        "text": "- Linux",
        "title": "Betroffene Betriebssysteme"
      }
    ],
    "publisher": {
      "category": "other",
      "contact_details": "csaf-provider@cert-bund.de",
      "name": "Bundesamt f\u00fcr Sicherheit in der Informationstechnik",
      "namespace": "https://www.bsi.bund.de"
    },
    "references": [
      {
        "category": "self",
        "summary": "WID-SEC-W-2024-3399 - CSAF Version",
        "url": "https://wid.cert-bund.de/.well-known/csaf/white/2024/wid-sec-w-2024-3399.json"
      },
      {
        "category": "self",
        "summary": "WID-SEC-2024-3399 - Portal Version",
        "url": "https://wid.cert-bund.de/portal/wid/securityadvisory?name=WID-SEC-2024-3399"
      },
      {
        "category": "external",
        "summary": "Kernel CVE Announce Mailingliste",
        "url": "https://lore.kernel.org/linux-cve-announce/"
      },
      {
        "category": "external",
        "summary": "Linux Kernel CVE Announcement CVE-2024-50263",
        "url": "https://lore.kernel.org/linux-cve-announce/2024111122-CVE-2024-50263-5c65@gregkh/"
      },
      {
        "category": "external",
        "summary": "openSUSE Security Update OPENSUSE-SU-2024:14500-1 vom 2024-11-16",
        "url": "https://lists.opensuse.org/archives/list/security-announce@lists.opensuse.org/thread/2NO44GTYBSPPWKFDREFWHITK4XKTNVLP/"
      },
      {
        "category": "external",
        "summary": "openSUSE Security Update OPENSUSE-SU-2025:14705-1 vom 2025-01-29",
        "url": "https://lists.opensuse.org/archives/list/security-announce@lists.opensuse.org/message/T7LN2FDZYBYZRLX5LOA3REDAXV7VKGW4/"
      },
      {
        "category": "external",
        "summary": "Ubuntu Security Notice USN-7277-1 vom 2025-02-19",
        "url": "https://ubuntu.com/security/notices/USN-7277-1"
      },
      {
        "category": "external",
        "summary": "Ubuntu Security Notice USN-7276-1 vom 2025-02-19",
        "url": "https://ubuntu.com/security/notices/USN-7276-1"
      },
      {
        "category": "external",
        "summary": "Ubuntu Security Notice USN-7310-1 vom 2025-02-28",
        "url": "https://ubuntu.com/security/notices/USN-7310-1"
      },
      {
        "category": "external",
        "summary": "Ubuntu Security Notice USN-7453-1 vom 2025-04-23",
        "url": "https://ubuntu.com/security/notices/USN-7453-1"
      },
      {
        "category": "external",
        "summary": "Ubuntu Security Notice USN-7451-1 vom 2025-04-23",
        "url": "https://ubuntu.com/security/notices/USN-7451-1"
      },
      {
        "category": "external",
        "summary": "Ubuntu Security Notice USN-7452-1 vom 2025-04-23",
        "url": "https://ubuntu.com/security/notices/USN-7452-1"
      },
      {
        "category": "external",
        "summary": "Ubuntu Security Notice USN-7450-1 vom 2025-04-23",
        "url": "https://ubuntu.com/security/notices/USN-7450-1"
      },
      {
        "category": "external",
        "summary": "Ubuntu Security Notice USN-7449-1 vom 2025-04-23",
        "url": "https://ubuntu.com/security/notices/USN-7449-1"
      },
      {
        "category": "external",
        "summary": "Ubuntu Security Notice USN-7449-2 vom 2025-04-24",
        "url": "https://ubuntu.com/security/notices/USN-7449-2"
      },
      {
        "category": "external",
        "summary": "Ubuntu Security Notice USN-7468-1 vom 2025-04-28",
        "url": "https://ubuntu.com/security/notices/USN-7468-1"
      },
      {
        "category": "external",
        "summary": "Ubuntu Security Notice USN-7523-1 vom 2025-05-20",
        "url": "https://ubuntu.com/security/notices/USN-7523-1"
      },
      {
        "category": "external",
        "summary": "Ubuntu Security Notice USN-7524-1 vom 2025-05-26",
        "url": "https://ubuntu.com/security/notices/USN-7524-1"
      }
    ],
    "source_lang": "en-US",
    "title": "Linux Kernel: Schwachstelle erm\u00f6glicht Denial of Service",
    "tracking": {
      "current_release_date": "2025-05-26T22:00:00.000+00:00",
      "generator": {
        "date": "2025-05-27T07:17:45.126+00:00",
        "engine": {
          "name": "BSI-WID",
          "version": "1.3.12"
        }
      },
      "id": "WID-SEC-W-2024-3399",
      "initial_release_date": "2024-11-11T23:00:00.000+00:00",
      "revision_history": [
        {
          "date": "2024-11-11T23:00:00.000+00:00",
          "number": "1",
          "summary": "Initiale Fassung"
        },
        {
          "date": "2024-11-17T23:00:00.000+00:00",
          "number": "2",
          "summary": "Neue Updates von openSUSE aufgenommen"
        },
        {
          "date": "2025-01-29T23:00:00.000+00:00",
          "number": "3",
          "summary": "Neue Updates von openSUSE aufgenommen"
        },
        {
          "date": "2025-02-19T23:00:00.000+00:00",
          "number": "4",
          "summary": "Neue Updates von Ubuntu aufgenommen"
        },
        {
          "date": "2025-02-27T23:00:00.000+00:00",
          "number": "5",
          "summary": "Neue Updates von Ubuntu aufgenommen"
        },
        {
          "date": "2025-04-23T22:00:00.000+00:00",
          "number": "6",
          "summary": "Neue Updates von Ubuntu aufgenommen"
        },
        {
          "date": "2025-04-24T22:00:00.000+00:00",
          "number": "7",
          "summary": "Neue Updates von Ubuntu aufgenommen"
        },
        {
          "date": "2025-04-28T22:00:00.000+00:00",
          "number": "8",
          "summary": "Neue Updates von Ubuntu aufgenommen"
        },
        {
          "date": "2025-05-20T22:00:00.000+00:00",
          "number": "9",
          "summary": "Neue Updates von Ubuntu aufgenommen"
        },
        {
          "date": "2025-05-26T22:00:00.000+00:00",
          "number": "10",
          "summary": "Neue Updates von Ubuntu aufgenommen"
        }
      ],
      "status": "final",
      "version": "10"
    }
  },
  "product_tree": {
    "branches": [
      {
        "branches": [
          {
            "branches": [
              {
                "category": "product_version_range",
                "name": "\u003c6.11.7",
                "product": {
                  "name": "Open Source Linux Kernel \u003c6.11.7",
                  "product_id": "T038909"
                }
              },
              {
                "category": "product_version",
                "name": "6.11.7",
                "product": {
                  "name": "Open Source Linux Kernel 6.11.7",
                  "product_id": "T038909-fixed",
                  "product_identification_helper": {
                    "cpe": "cpe:/o:linux:linux_kernel:6.11.7"
                  }
                }
              },
              {
                "category": "product_version_range",
                "name": "\u003c6.12-rc6",
                "product": {
                  "name": "Open Source Linux Kernel \u003c6.12-rc6",
                  "product_id": "T038910"
                }
              },
              {
                "category": "product_version",
                "name": "6.12-rc6",
                "product": {
                  "name": "Open Source Linux Kernel 6.12-rc6",
                  "product_id": "T038910-fixed",
                  "product_identification_helper": {
                    "cpe": "cpe:/o:linux:linux_kernel:6.12-rc6"
                  }
                }
              }
            ],
            "category": "product_name",
            "name": "Linux Kernel"
          }
        ],
        "category": "vendor",
        "name": "Open Source"
      },
      {
        "branches": [
          {
            "category": "product_name",
            "name": "SUSE openSUSE",
            "product": {
              "name": "SUSE openSUSE",
              "product_id": "T027843",
              "product_identification_helper": {
                "cpe": "cpe:/o:suse:opensuse:-"
              }
            }
          }
        ],
        "category": "vendor",
        "name": "SUSE"
      },
      {
        "branches": [
          {
            "category": "product_name",
            "name": "Ubuntu Linux",
            "product": {
              "name": "Ubuntu Linux",
              "product_id": "T000126",
              "product_identification_helper": {
                "cpe": "cpe:/o:canonical:ubuntu_linux:-"
              }
            }
          }
        ],
        "category": "vendor",
        "name": "Ubuntu"
      }
    ]
  },
  "vulnerabilities": [
    {
      "cve": "CVE-2024-50263",
      "product_status": {
        "known_affected": [
          "T000126",
          "T027843",
          "T038910",
          "T038909"
        ]
      },
      "release_date": "2024-11-11T23:00:00.000+00:00",
      "title": "CVE-2024-50263"
    }
  ]
}

CVE-2024-50263 (GCVE-0-2024-50263)

Vulnerability from cvelistv5 – Published: 2024-11-11 13:58 – Updated: 2025-05-04 09:50

Summary

In the Linux kernel, the following vulnerability has been resolved: fork: only invoke khugepaged, ksm hooks if no error There is no reason to invoke these hooks early against an mm that is in an incomplete state. The change in commit d24062914837 ("fork: use __mt_dup() to duplicate maple tree in dup_mmap()") makes this more pertinent as we may be in a state where entries in the maple tree are not yet consistent. Their placement early in dup_mmap() only appears to have been meaningful for early error checking, and since functionally it'd require a very small allocation to fail (in practice 'too small to fail') that'd only occur in the most dire circumstances, meaning the fork would fail or be OOM'd in any case. Since both khugepaged and KSM tracking are there to provide optimisations to memory performance rather than critical functionality, it doesn't really matter all that much if, under such dire memory pressure, we fail to register an mm with these. As a result, we follow the example of commit d2081b2bf819 ("mm: khugepaged: make khugepaged_enter() void function") and make ksm_fork() a void function also. We only expose the mm to these functions once we are done with them and only if no error occurred in the fork operation.

Severity ?

No CVSS data available.

Assigner

Linux

References

URL

Tags

	https://git.kernel.org/stable/c/3b85aa0da8cd01173…
	https://git.kernel.org/stable/c/985da552a98e27096…
	https://project-zero.issues.chromium.org/issues/3…

Impacted products

Vendor

Product

Version

Linux

Affected: d2406291483775ecddaee929231a39c70c08fda2 , < 3b85aa0da8cd01173b9afd1f70080fbb9576c4b0 (git)
Affected: d2406291483775ecddaee929231a39c70c08fda2 , < 985da552a98e27096444508ce5d853244019111f (git)

Linux

Affected: 6.8
Unaffected: 0 , < 6.8 (semver)
Unaffected: 6.11.7 , ≤ 6.11.* (semver)
Unaffected: 6.12 , ≤ * (original_commit_for_fix)

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "include/linux/ksm.h",
            "kernel/fork.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "3b85aa0da8cd01173b9afd1f70080fbb9576c4b0",
              "status": "affected",
              "version": "d2406291483775ecddaee929231a39c70c08fda2",
              "versionType": "git"
            },
            {
              "lessThan": "985da552a98e27096444508ce5d853244019111f",
              "status": "affected",
              "version": "d2406291483775ecddaee929231a39c70c08fda2",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "include/linux/ksm.h",
            "kernel/fork.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.8"
            },
            {
              "lessThan": "6.8",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.11.*",
              "status": "unaffected",
              "version": "6.11.7",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "6.12",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.11.7",
                  "versionStartIncluding": "6.8",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12",
                  "versionStartIncluding": "6.8",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nfork: only invoke khugepaged, ksm hooks if no error\n\nThere is no reason to invoke these hooks early against an mm that is in an\nincomplete state.\n\nThe change in commit d24062914837 (\"fork: use __mt_dup() to duplicate\nmaple tree in dup_mmap()\") makes this more pertinent as we may be in a\nstate where entries in the maple tree are not yet consistent.\n\nTheir placement early in dup_mmap() only appears to have been meaningful\nfor early error checking, and since functionally it\u0027d require a very small\nallocation to fail (in practice \u0027too small to fail\u0027) that\u0027d only occur in\nthe most dire circumstances, meaning the fork would fail or be OOM\u0027d in\nany case.\n\nSince both khugepaged and KSM tracking are there to provide optimisations\nto memory performance rather than critical functionality, it doesn\u0027t\nreally matter all that much if, under such dire memory pressure, we fail\nto register an mm with these.\n\nAs a result, we follow the example of commit d2081b2bf819 (\"mm:\nkhugepaged: make khugepaged_enter() void function\") and make ksm_fork() a\nvoid function also.\n\nWe only expose the mm to these functions once we are done with them and\nonly if no error occurred in the fork operation."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2025-05-04T09:50:13.551Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/3b85aa0da8cd01173b9afd1f70080fbb9576c4b0"
        },
        {
          "url": "https://git.kernel.org/stable/c/985da552a98e27096444508ce5d853244019111f"
        },
        {
          "url": "https://project-zero.issues.chromium.org/issues/373391951"
        }
      ],
      "title": "fork: only invoke khugepaged, ksm hooks if no error",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2024-50263",
    "datePublished": "2024-11-11T13:58:18.577Z",
    "dateReserved": "2024-10-21T19:36:19.982Z",
    "dateUpdated": "2025-05-04T09:50:13.551Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "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

WID-SEC-W-2024-3399

CVE-2024-50263 (GCVE-0-2024-50263)

Tags

Sightings

Nomenclature