OESA-2026-3978 (CVE-2026-53613)

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

{
  "affected": [
    {
      "ecosystem_specific": {
        "aarch64": [
          "libblkid-2.35.2-35.oe2003sp4.aarch64.rpm",
          "libfdisk-2.35.2-35.oe2003sp4.aarch64.rpm",
          "libmount-2.35.2-35.oe2003sp4.aarch64.rpm",
          "libsmartcols-2.35.2-35.oe2003sp4.aarch64.rpm",
          "libuuid-2.35.2-35.oe2003sp4.aarch64.rpm",
          "python-libmount-2.35.2-35.oe2003sp4.aarch64.rpm",
          "util-linux-2.35.2-35.oe2003sp4.aarch64.rpm",
          "util-linux-debuginfo-2.35.2-35.oe2003sp4.aarch64.rpm",
          "util-linux-debugsource-2.35.2-35.oe2003sp4.aarch64.rpm",
          "util-linux-devel-2.35.2-35.oe2003sp4.aarch64.rpm",
          "util-linux-user-2.35.2-35.oe2003sp4.aarch64.rpm",
          "uuidd-2.35.2-35.oe2003sp4.aarch64.rpm"
        ],
        "noarch": [
          "util-linux-help-2.35.2-35.oe2003sp4.noarch.rpm"
        ],
        "src": [
          "util-linux-2.35.2-35.oe2003sp4.src.rpm"
        ],
        "x86_64": [
          "libblkid-2.35.2-35.oe2003sp4.x86_64.rpm",
          "libfdisk-2.35.2-35.oe2003sp4.x86_64.rpm",
          "libmount-2.35.2-35.oe2003sp4.x86_64.rpm",
          "libsmartcols-2.35.2-35.oe2003sp4.x86_64.rpm",
          "libuuid-2.35.2-35.oe2003sp4.x86_64.rpm",
          "python-libmount-2.35.2-35.oe2003sp4.x86_64.rpm",
          "util-linux-2.35.2-35.oe2003sp4.x86_64.rpm",
          "util-linux-debuginfo-2.35.2-35.oe2003sp4.x86_64.rpm",
          "util-linux-debugsource-2.35.2-35.oe2003sp4.x86_64.rpm",
          "util-linux-devel-2.35.2-35.oe2003sp4.x86_64.rpm",
          "util-linux-user-2.35.2-35.oe2003sp4.x86_64.rpm",
          "uuidd-2.35.2-35.oe2003sp4.x86_64.rpm"
        ]
      },
      "package": {
        "ecosystem": "openEuler:20.03-LTS-SP4",
        "name": "util-linux",
        "purl": "pkg:rpm/openEuler/util-linux\u0026distro=openEuler-20.03-LTS-SP4"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "2.35.2-35.oe2003sp4"
            }
          ],
          "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-2026-3978",
  "modified": "2026-09-20T13:23:45Z",
  "published": "2026-09-20T13:23:45Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.openeuler.org/zh/security/security-bulletins/detail/?id=openEuler-SA-2026-3978"
    },
    {
      "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"
  ]
}



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