Vulnerability-Lookup

OESA-2026-3979 (CVE-2026-53613)

Vulnerability from osv_openeuler – Published: 2026-09-20 13:23 – Updated: 2026-09-20 13:23 – Source website

Summary

util-linux security update

Details

The util-linux package contains a random collection of files that implements some low-level basic linux utilities.

Security Fix(es):

When an /etc/fstab entry is configured with the user or users option, mount(8) validates the target path before performing the mount syscall, creating a Time-of-Check-Time-of-Use (TOCTOU) window. A local unprivileged user with write access to an ancestor directory of the mount target can swap that directory to redirect the mount to an arbitrary root-owned location, potentially escalating privileges to root.(CVE-2026-53613)

A flaw was found in util-linux. Restricted bind mounts take the source path from fstab but do not pin that source before the privileged mount. A local unprivileged user who can replace the authorized source or a writable ancestor can redirect SUID mount(8) to bind another host directory. If the fstab entry also sets X-mount.owner, X-mount.group, or X-mount.mode, root then changes ownership or mode on that redirected inode.(CVE-2026-78410)

Severity

7.8 (High)


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

References

URL

Type

	https://www.openeuler.org/zh/security/security-bu…	ADVISORY
	https://nvd.nist.gov/vuln/detail/CVE-2026-53613	ADVISORY
	https://nvd.nist.gov/vuln/detail/CVE-2026-78410	ADVISORY

JSON

To clipboard

{
  "affected": [
    {
      "ecosystem_specific": {
        "aarch64": [
          "libblkid-2.37.2-56.oe2203sp4.aarch64.rpm",
          "libfdisk-2.37.2-56.oe2203sp4.aarch64.rpm",
          "libmount-2.37.2-56.oe2203sp4.aarch64.rpm",
          "libsmartcols-2.37.2-56.oe2203sp4.aarch64.rpm",
          "libuuid-2.37.2-56.oe2203sp4.aarch64.rpm",
          "python3-libmount-2.37.2-56.oe2203sp4.aarch64.rpm",
          "util-linux-2.37.2-56.oe2203sp4.aarch64.rpm",
          "util-linux-debuginfo-2.37.2-56.oe2203sp4.aarch64.rpm",
          "util-linux-debugsource-2.37.2-56.oe2203sp4.aarch64.rpm",
          "util-linux-devel-2.37.2-56.oe2203sp4.aarch64.rpm",
          "util-linux-user-2.37.2-56.oe2203sp4.aarch64.rpm",
          "uuidd-2.37.2-56.oe2203sp4.aarch64.rpm"
        ],
        "noarch": [
          "util-linux-help-2.37.2-56.oe2203sp4.noarch.rpm"
        ],
        "src": [
          "util-linux-2.37.2-56.oe2203sp4.src.rpm"
        ],
        "x86_64": [
          "libblkid-2.37.2-56.oe2203sp4.x86_64.rpm",
          "libfdisk-2.37.2-56.oe2203sp4.x86_64.rpm",
          "libmount-2.37.2-56.oe2203sp4.x86_64.rpm",
          "libsmartcols-2.37.2-56.oe2203sp4.x86_64.rpm",
          "libuuid-2.37.2-56.oe2203sp4.x86_64.rpm",
          "python3-libmount-2.37.2-56.oe2203sp4.x86_64.rpm",
          "util-linux-2.37.2-56.oe2203sp4.x86_64.rpm",
          "util-linux-debuginfo-2.37.2-56.oe2203sp4.x86_64.rpm",
          "util-linux-debugsource-2.37.2-56.oe2203sp4.x86_64.rpm",
          "util-linux-devel-2.37.2-56.oe2203sp4.x86_64.rpm",
          "util-linux-user-2.37.2-56.oe2203sp4.x86_64.rpm",
          "uuidd-2.37.2-56.oe2203sp4.x86_64.rpm"
        ]
      },
      "package": {
        "ecosystem": "openEuler:22.03-LTS-SP4",
        "name": "util-linux",
        "purl": "pkg:rpm/openEuler/util-linux\u0026distro=openEuler-22.03-LTS-SP4"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "2.37.2-56.oe2203sp4"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "severity": "High"
  },
  "details": "The util-linux package contains a random collection of files that implements some low-level basic linux utilities.\r\n\r\nSecurity Fix(es):\n\nWhen an /etc/fstab entry is configured with the user or users option, mount(8) validates the target path before performing the mount syscall, creating a Time-of-Check-Time-of-Use (TOCTOU) window. A local unprivileged user with write access to an ancestor directory of the mount target can swap that directory to redirect the mount to an arbitrary root-owned location, potentially escalating privileges to root.(CVE-2026-53613)\n\nA flaw was found in util-linux. Restricted bind mounts take the source path from fstab but do not pin that source before the privileged mount. A local unprivileged user who can replace the authorized source or a writable ancestor can redirect SUID mount(8) to bind another host directory. If the fstab entry also sets X-mount.owner, X-mount.group, or X-mount.mode, root then changes ownership or mode on that redirected inode.(CVE-2026-78410)",
  "id": "OESA-2026-3979",
  "modified": "2026-09-20T13:23:46Z",
  "published": "2026-09-20T13:23:46Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.openeuler.org/zh/security/security-bulletins/detail/?id=openEuler-SA-2026-3979"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-53613"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-78410"
    }
  ],
  "schema_version": "1.7.2",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "util-linux security update",
  "upstream": [
    "CVE-2026-53613",
    "CVE-2026-78410"
  ]
}

CVE-2026-78410 (GCVE-0-2026-78410)

Vulnerability from cvelistv5 – Published: 2026-09-02 15:05 – Updated: 2026-09-04 18:43

Title

Util-linux: util-linux: restricted bind mounts do not pin the source, allowing x-mount.owner/group/mode redirection

Summary

Severity

7.8 (High)


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

SSVC

Exploitation: poc Automatable: no Technical Impact: total

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-09-04 18:43 UTC

CWE

CWE-367 - Time-of-check Time-of-use (TOCTOU) Race Condition

Assigner

redhat redhat root

References

4 references

URL	Tags
https://access.redhat.com/errata/RHSA-2026:63162	vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/security/cve/CVE-2026-78410	vdb-entryx_refsource_REDHAT
https://bugzilla.redhat.com/show_bug.cgi?id=2522684	issue-trackingx_refsource_REDHAT
https://github.com/util-linux/util-linux/security…

Impacted products

6 products

Vendor	Product	Version
Red Hat	Red Hat Hardened Images	Unaffected: 2.42.2-3.4.hum1 , < * (rpm) cpe:/a:redhat:hummingbird:1
Red Hat	Red Hat Enterprise Linux 10	cpe:/o:redhat:enterprise_linux:10
Red Hat	Red Hat Enterprise Linux 7	cpe:/o:redhat:enterprise_linux:7
Red Hat	Red Hat Enterprise Linux 8	cpe:/o:redhat:enterprise_linux:8
Red Hat	Red Hat Enterprise Linux 9	cpe:/o:redhat:enterprise_linux:9
Red Hat	Red Hat OpenShift Container Platform 4	cpe:/a:redhat:openshift:4

Date Public

2026-09-02 00:00

Credits

Upstream acknowledges Zhuorao Yang (Huawei Cloud) as the original reporter.

Show details on NVD website

JSON

To clipboard

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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.

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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Action not permitted

OESA-2026-3979 (CVE-2026-53613)

CVE-2026-78410 (GCVE-0-2026-78410)

Tags

Sightings

Nomenclature

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