ALSA-2026:19664 (CVE-2026-43503)

Vulnerability from osv_almalinux – Published: 2026-05-20 00:00 – Updated: 2026-10-26 00:00 – Source website
VLAI
Summary
Important: kernel-rt security update
Details

The kernel-rt packages provide the Real Time Linux Kernel, which enables fine-tuning for systems with extremely high determinism requirements.

Security Fix(es):

  • kernel: "Fragnesia" is a variant of Dirty Frag vulnerability in the ESP/XFRM leading to Local Privilege Escalation (LPE) vulnerability in the Linux kernel (CVE-2026-46300)
  • kernel: Read root-owned files as an unprivileged user (CVE-2026-46333)

For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

References
To clipboard 

{
  "affected": [
    {
      "package": {
        "ecosystem": "AlmaLinux:8",
        "name": "kernel-rt"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "4.18.0-553.125.1.rt7.466.el8_10"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "AlmaLinux:8",
        "name": "kernel-rt-core"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "4.18.0-553.125.1.rt7.466.el8_10"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "AlmaLinux:8",
        "name": "kernel-rt-debug"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "4.18.0-553.125.1.rt7.466.el8_10"
            }
          ],
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        }
      ]
    },
    {
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      },
      "ranges": [
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          "events": [
            {
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            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "AlmaLinux:8",
        "name": "kernel-rt-debug-devel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
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            }
          ],
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        }
      ]
    },
    {
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        "ecosystem": "AlmaLinux:8",
        "name": "kernel-rt-debug-modules"
      },
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            {
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            }
          ],
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      ]
    },
    {
      "package": {
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        "name": "kernel-rt-debug-modules-extra"
      },
      "ranges": [
        {
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            {
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            },
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            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "AlmaLinux:8",
        "name": "kernel-rt-devel"
      },
      "ranges": [
        {
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            {
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        "ecosystem": "AlmaLinux:8",
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      "ranges": [
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            {
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          ],
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        "ecosystem": "AlmaLinux:8",
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      },
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          "type": "ECOSYSTEM"
        }
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    }
  ],
  "details": "The kernel-rt packages provide the Real Time Linux Kernel, which enables fine-tuning for systems with extremely high determinism requirements.  \n\nSecurity Fix(es):  \n\n  * kernel: \"Fragnesia\" is a variant of Dirty Frag vulnerability in the ESP/XFRM leading to Local Privilege Escalation (LPE) vulnerability in the Linux kernel (CVE-2026-46300)\n  * kernel: Read root-owned files as an unprivileged user (CVE-2026-46333)\n\n\nFor more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.\n",
  "id": "ALSA-2026:19664",
  "modified": "2026-10-26T00:00:49Z",
  "published": "2026-05-20T00:00:00Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://access.redhat.com/errata/RHSA-2026:19664"
    },
    {
      "type": "REPORT",
      "url": "https://access.redhat.com/security/cve/CVE-2026-46300"
    },
    {
      "type": "REPORT",
      "url": "https://access.redhat.com/security/cve/CVE-2026-46333"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/2477015"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/2477802"
    },
    {
      "type": "ADVISORY",
      "url": "https://errata.almalinux.org/8/ALSA-2026-19664.html"
    },
    {
      "type": "REPORT",
      "url": "https://www.redhat.com/security/data/cve/CVE-2026-43503.html"
    }
  ],
  "related": [
    "CVE-2026-43503",
    "CVE-2026-46300",
    "CVE-2026-46333"
  ],
  "schema_version": "1.7.0",
  "summary": "Important: kernel-rt security update",
  "upstream": [
    "CVE-2026-43503",
    "CVE-2026-46300",
    "CVE-2026-46333"
  ]
}



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