Vulnerability-Lookup

GHSA-RF37-4WVF-8H47

Vulnerability from github – Published: 2026-07-19 18:31 – Updated: 2026-07-20 15:32

Details

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

lsm: hold cred_guard_mutex for lsm_set_self_attr()

Just as proc_pid_attr_write() already does before calling the LSM hook. This only matters for SELinux and AppArmor which check whether the process is being ptraced and if so, whether to allow the transition.

Severity

7.1 (High)


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

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{
  "affected": [],
  "aliases": [
    "CVE-2026-64111"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-07-19T16:17:52Z",
    "severity": "HIGH"
  },
  "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.",
  "id": "GHSA-rf37-4wvf-8h47",
  "modified": "2026-07-20T15:32:00Z",
  "published": "2026-07-19T18:31:52Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-64111"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/4a9b16541ad3faf8bccb398532bf3f8b6bbf1188"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/5b906f31e977286888a9e31282589b545b249139"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/82d3acee88593e3d9e71cad4b7d6b3cf70de9d07"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/a010cadaf5727b8417f62fe9021fcef14a5f9b51"
    }
  ],
  "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:N",
      "type": "CVSS_V3"
    }
  ]
}

CVE-2026-64111 (GCVE-0-2026-64111)

Vulnerability from cvelistv5 – Published: 2026-07-19 15:40 – Updated: 2026-08-05 12:39

Title

lsm: hold cred_guard_mutex for lsm_set_self_attr()

Summary

In the Linux kernel, the following vulnerability has been resolved: lsm: hold cred_guard_mutex for lsm_set_self_attr() Just as proc_pid_attr_write() already does before calling the LSM hook. This only matters for SELinux and AppArmor which check whether the process is being ptraced and if so, whether to allow the transition.

Severity

7.1 (High)


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

Assigner

Linux CNA under the mitre root

CNA scorecard D 53/100 over 6843 records in the last 180 days details

References

4 references

URL	Tags
https://git.kernel.org/stable/c/82d3acee88593e3d9…
https://git.kernel.org/stable/c/5b906f31e97728688…
https://git.kernel.org/stable/c/a010cadaf5727b841…
https://git.kernel.org/stable/c/4a9b16541ad3faf8b…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: a04a1198088a1378d0389c250cc684f649bcc91e , < 82d3acee88593e3d9e71cad4b7d6b3cf70de9d07 (git) Affected: a04a1198088a1378d0389c250cc684f649bcc91e , < 5b906f31e977286888a9e31282589b545b249139 (git) Affected: a04a1198088a1378d0389c250cc684f649bcc91e , < a010cadaf5727b8417f62fe9021fcef14a5f9b51 (git) Affected: a04a1198088a1378d0389c250cc684f649bcc91e , < 4a9b16541ad3faf8bccb398532bf3f8b6bbf1188 (git)
Linux	Linux	Affected: 6.8 Unaffected: 0 , < 6.8 (semver) Unaffected: 6.12.92 , ≤ 6.12.* (semver) Unaffected: 6.18.34 , ≤ 6.18.* (semver) Unaffected: 7.0.11 , ≤ 7.0.* (semver) Unaffected: 7.1 , ≤ * (original_commit_for_fix)

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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "security/lsm_syscalls.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "82d3acee88593e3d9e71cad4b7d6b3cf70de9d07",
              "status": "affected",
              "version": "a04a1198088a1378d0389c250cc684f649bcc91e",
              "versionType": "git"
            },
            {
              "lessThan": "5b906f31e977286888a9e31282589b545b249139",
              "status": "affected",
              "version": "a04a1198088a1378d0389c250cc684f649bcc91e",
              "versionType": "git"
            },
            {
              "lessThan": "a010cadaf5727b8417f62fe9021fcef14a5f9b51",
              "status": "affected",
              "version": "a04a1198088a1378d0389c250cc684f649bcc91e",
              "versionType": "git"
            },
            {
              "lessThan": "4a9b16541ad3faf8bccb398532bf3f8b6bbf1188",
              "status": "affected",
              "version": "a04a1198088a1378d0389c250cc684f649bcc91e",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "security/lsm_syscalls.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": "6.12.*",
              "status": "unaffected",
              "version": "6.12.92",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.34",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.0.*",
              "status": "unaffected",
              "version": "7.0.11",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.1",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.92",
                  "versionStartIncluding": "6.8",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.34",
                  "versionStartIncluding": "6.8",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.0.11",
                  "versionStartIncluding": "6.8",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.1",
                  "versionStartIncluding": "6.8",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "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."
        }
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      "metrics": [
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            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "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\u0027s 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-\u003esid` or AppArmor label replacement), constituting arbitrary modification of the process\u0027s 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."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-05T12:39:20.048Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/82d3acee88593e3d9e71cad4b7d6b3cf70de9d07"
        },
        {
          "url": "https://git.kernel.org/stable/c/5b906f31e977286888a9e31282589b545b249139"
        },
        {
          "url": "https://git.kernel.org/stable/c/a010cadaf5727b8417f62fe9021fcef14a5f9b51"
        },
        {
          "url": "https://git.kernel.org/stable/c/4a9b16541ad3faf8bccb398532bf3f8b6bbf1188"
        }
      ],
      "title": "lsm: hold cred_guard_mutex for lsm_set_self_attr()",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-64111",
    "datePublished": "2026-07-19T15:40:13.007Z",
    "dateReserved": "2026-07-19T07:54:57.035Z",
    "dateUpdated": "2026-08-05T12:39:20.048Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

Sightings

Author	Source	Type	Date	Other

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.

Vulnerability timeline

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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
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