Vulnerability-Lookup

GHSA-JJXV-P5QR-W2HV

Vulnerability from github – Published: 2026-03-09 15:30 – Updated: 2026-03-09 18:31

Details

In practice, this overflow immediately overwrites the canary for the rtsock_msg_buffer() stack frame, resulting in a panic once the function returns.

The bug allows an unprivileged user to crash the kernel by triggering a stack buffer overflow in rtsock_msg_buffer(). In particular, the overflow will corrupt a stack canary value that is verified when the function returns; this mitigates the impact of the stack overflow by triggering a kernel panic.

Other kernel bugs may exist which allow userspace to find the canary value and thus defeat the mitigation, at which point local privilege escalation may be possible.

Severity ?

7.5 (High)


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

Show details on source website

JSON

To clipboard

{
  "affected": [],
  "aliases": [
    "CVE-2026-3038"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-787"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-03-09T13:15:57Z",
    "severity": "HIGH"
  },
  "details": "The rtsock_msg_buffer() function serializes routing information into a buffer.  As a part of this, it copies sockaddr structures into a sockaddr_storage structure on the stack.  It assumes that the source sockaddr length field had already been validated, but this is not necessarily the case, and it\u0027s possible for a malicious userspace program to craft a request which triggers a 127-byte overflow.\n\n In practice, this overflow immediately overwrites the canary for the rtsock_msg_buffer() stack frame, resulting in a panic once the function returns.\n\nThe bug allows an unprivileged user to crash the kernel by triggering a stack buffer overflow in rtsock_msg_buffer().  In particular, the overflow will corrupt a stack canary value that is verified when the function returns; this mitigates the impact of the stack overflow by triggering a kernel panic.\n\nOther kernel bugs may exist which allow userspace to find the canary value and thus defeat the mitigation, at which point local privilege escalation may be possible.",
  "id": "GHSA-jjxv-p5qr-w2hv",
  "modified": "2026-03-09T18:31:43Z",
  "published": "2026-03-09T15:30:47Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-3038"
    },
    {
      "type": "WEB",
      "url": "https://security.freebsd.org/advisories/FreeBSD-SA-26:05.route.asc"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    }
  ]
}

CVE-2026-3038 (GCVE-0-2026-3038)

Vulnerability from cvelistv5 – Published: 2026-03-09 12:25 – Updated: 2026-03-09 16:03

Title

Local DoS and possible privilege escalation via routing sockets

Summary

The rtsock_msg_buffer() function serializes routing information into a buffer. As a part of this, it copies sockaddr structures into a sockaddr_storage structure on the stack. It assumes that the source sockaddr length field had already been validated, but this is not necessarily the case, and it's possible for a malicious userspace program to craft a request which triggers a 127-byte overflow. In practice, this overflow immediately overwrites the canary for the rtsock_msg_buffer() stack frame, resulting in a panic once the function returns. The bug allows an unprivileged user to crash the kernel by triggering a stack buffer overflow in rtsock_msg_buffer(). In particular, the overflow will corrupt a stack canary value that is verified when the function returns; this mitigates the impact of the stack overflow by triggering a kernel panic. Other kernel bugs may exist which allow userspace to find the canary value and thus defeat the mitigation, at which point local privilege escalation may be possible.

Severity ?

7.5 (High)


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

CWE

CWE-787 - Out-of-bounds Write

Assigner

freebsd

References

URL

Tags

https://security.freebsd.org/advisories/FreeBSD-S…

vendor-advisory

Impacted products

	Vendor	Product	Version
	FreeBSD	FreeBSD	Affected: 15.0-RELEASE , < p4 (release) Affected: 14.3-RELEASE , < p9 (release) Affected: 13.5-RELEASE , < p10 (release) Affected: 14.4-RC1 (beta)

Date Public ?

2026-02-24 17:00

Credits

Adam Crosser of the Praetorian Labs team

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "cvssV3_1": {
              "attackComplexity": "LOW",
              "attackVector": "NETWORK",
              "availabilityImpact": "HIGH",
              "baseScore": 7.5,
              "baseSeverity": "HIGH",
              "confidentialityImpact": "NONE",
              "integrityImpact": "NONE",
              "privilegesRequired": "NONE",
              "scope": "UNCHANGED",
              "userInteraction": "NONE",
              "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
              "version": "3.1"
            }
          },
          {
            "other": {
              "content": {
                "id": "CVE-2026-3038",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "yes"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-03-09T16:03:08.637542Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-03-09T16:03:25.820Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "defaultStatus": "unknown",
          "modules": [
            "route"
          ],
          "product": "FreeBSD",
          "vendor": "FreeBSD",
          "versions": [
            {
              "lessThan": "p4",
              "status": "affected",
              "version": "15.0-RELEASE",
              "versionType": "release"
            },
            {
              "lessThan": "p9",
              "status": "affected",
              "version": "14.3-RELEASE",
              "versionType": "release"
            },
            {
              "lessThan": "p10",
              "status": "affected",
              "version": "13.5-RELEASE",
              "versionType": "release"
            },
            {
              "status": "affected",
              "version": "14.4-RC1",
              "versionType": "beta"
            }
          ]
        }
      ],
      "credits": [
        {
          "lang": "en",
          "type": "finder",
          "value": "Adam Crosser of the Praetorian Labs team"
        }
      ],
      "datePublic": "2026-02-24T17:00:00.000Z",
      "descriptions": [
        {
          "lang": "en",
          "value": "The rtsock_msg_buffer() function serializes routing information into a buffer.  As a part of this, it copies sockaddr structures into a sockaddr_storage structure on the stack.  It assumes that the source sockaddr length field had already been validated, but this is not necessarily the case, and it\u0027s possible for a malicious userspace program to craft a request which triggers a 127-byte overflow.\n\n In practice, this overflow immediately overwrites the canary for the rtsock_msg_buffer() stack frame, resulting in a panic once the function returns.\n\nThe bug allows an unprivileged user to crash the kernel by triggering a stack buffer overflow in rtsock_msg_buffer().  In particular, the overflow will corrupt a stack canary value that is verified when the function returns; this mitigates the impact of the stack overflow by triggering a kernel panic.\n\nOther kernel bugs may exist which allow userspace to find the canary value and thus defeat the mitigation, at which point local privilege escalation may be possible."
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-787",
              "description": "CWE-787 Out-of-bounds Write",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-03-09T12:25:39.671Z",
        "orgId": "63664ac6-956c-4cba-a5d0-f46076e16109",
        "shortName": "freebsd"
      },
      "references": [
        {
          "tags": [
            "vendor-advisory"
          ],
          "url": "https://security.freebsd.org/advisories/FreeBSD-SA-26:05.route.asc"
        }
      ],
      "title": "Local DoS and possible privilege escalation via routing sockets",
      "x_generator": {
        "engine": "cvelib 1.8.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "63664ac6-956c-4cba-a5d0-f46076e16109",
    "assignerShortName": "freebsd",
    "cveId": "CVE-2026-3038",
    "datePublished": "2026-03-09T12:25:39.671Z",
    "dateReserved": "2026-02-23T16:26:02.807Z",
    "dateUpdated": "2026-03-09T16:03:25.820Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

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-JJXV-P5QR-W2HV

CVE-2026-3038 (GCVE-0-2026-3038)

Tags

Sightings

Nomenclature