{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-64111",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2026-64111"
  ],
  "published": "2026-07-19T15:41:06Z",
  "summary": "lsm: hold cred_guard_mutex for lsm_set_self_attr()",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nlsm: hold cred_guard_mutex for lsm_set_self_attr()\n\nJust as proc_pid_attr_write() already does before calling the LSM\nhook. This only matters for SELinux and AppArmor which check\nwhether the process is being ptraced and if so, whether to\nallow the transition.",
  "severity": [
    {
      "type": "CVSS_V3",
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N"
    }
  ],
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    }
  ],
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-64111"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/82d3acee88593e3d9e71cad4b7d6b3cf70de9d07"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/5b906f31e977286888a9e31282589b545b249139"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/a010cadaf5727b8417f62fe9021fcef14a5f9b51"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/4a9b16541ad3faf8bccb398532bf3f8b6bbf1188"
    }
  ],
  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-08-05T13:16:28Z",
    "severity": {
      "source": "kernel CNA",
      "cvss_v3_score": 7.1,
      "cvss_v3_severity": "High",
      "scenario": "AV:L - Exploitation requires invoking the `lsm_set_self_attr` syscall (NR 460), which is strictly a local kernel entry point with no network, adjacent-wireless, or physical-device path to the vulnerable code.\nAC:L - The bug is a TOCTOU race between `lsm_set_self_attr` and concurrent ptrace attach/detach; an attacker can control both the tracee thread issuing the syscall and a tracer thread (e.g., via fork/PTRACE_TRACEME), making the race reliably winnable without conditions outside attacker control.\nPR:L - Any unprivileged local user can reach `sys_lsm_set_self_attr`; there is no capability or root requirement at the syscall boundary, and ptrace coordination is achievable within the same UID via standard unprivileged ptrace APIs.\nUI:N - Exploitation does not require any action from a separate victim user such as opening a file or mounting a filesystem; the attacker drives both the setattr syscall and the ptrace race directly.\nS:U - Successful exploitation changes the calling process's LSM credentials within the same kernel/OS security authority (SELinux domain or AppArmor profile transition), constituting standard local MAC bypass rather than crossing a VM, container-host, or IOMMU boundary.\nC:H - Bypassing the ptrace-mediated transition check allows committing a new SELinux SID or AppArmor profile without tracer authorization, granting read access to data and resources denied under the prior confined context.\nI:H - The attack culminates in `commit_creds()` with an unauthorized LSM security context (SELinux `crsec->sid` or AppArmor label replacement), constituting arbitrary modification of the process's mandatory access control identity and associated permissions.\nA:N - The vulnerability is a missing mutex enabling a policy-bypass race; it does not involve memory corruption, kernel oops, panic, hang, or other availability-impacting failure modes."
    }
  }
}