CVE-2026-49415 (GCVE-0-2026-49415)

Vulnerability from cvelistv5 – Published: 2026-08-19 04:38 – Updated: 2026-08-19 04:38
VLAI
Title
Local privilege escalation via execve(2) TOCTOU race
Summary
During execve(2) of a SUID binary, the new virtual address space is installed before the process credentials are updated. During this window, a process running as the same user can access the target process's memory via procfs or linprocfs, because the kernel's debugging permission check still saw the original credentials. An unprivileged local user can exploit this race to modify the address space of a SUID binary before its credentials are elevated, potentially gaining full control of the affected system.
Severity
No CVSS data available.
CWE
  • CWE-367 - Time-of-check Time-of-use (TOCTOU) Race Condition
Assigner
References
Impacted products
Vendor Product Version CPE status
FreeBSD FreeBSD Affected: 15.1-RELEASE , < p1 (release)
Affected: 15.0-RELEASE , < p11 (release)
Affected: 14.4-RELEASE , < p7 (release)
Affected: 14.3-RELEASE , < p16 (release)
guessed Create a notification for this product.
Date Public
2026-06-30 20:00
Credits
Synacktiv
Show details on NVD website
To clipboard 

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        }
      ],
      "problemTypes": [
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          "descriptions": [
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      "providerMetadata": {
        "dateUpdated": "2026-08-19T04:38:24.391Z",
        "orgId": "63664ac6-956c-4cba-a5d0-f46076e16109",
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          "url": "https://security.freebsd.org/advisories/FreeBSD-SA-26:39.execve.asc"
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    "dateReserved": "2026-05-29T20:24:28.615Z",
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  }
}



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