rlsa-2026:42952
Vulnerability from osv_rocky
Published
2026-07-23 06:04
Modified
2026-07-25 06:07
Summary
Moderate: glibc security update
Details

The glibc packages provide the standard C libraries (libc), POSIX thread libraries (libpthread), standard math libraries (libm), and the name service cache daemon (nscd) used by multiple programs on the system. Without these libraries, the Linux system cannot function correctly.

Security Fix(es):

  • glibc: glibc: Information disclosure or denial of service via ungetwc function with specific wide character encodings (CVE-2026-5928)

  • glibc: glibc: Out-of-bounds write via TSIG record processing (CVE-2026-5435)

  • glibc: glibc: Application crash or uninitialized memory read via crafted DNS response (CVE-2026-6238)

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.

Severity
6.5 (Medium)
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:H
Credits
Rocky Enterprise Software Foundation
Red Hat
References
To clipboard 

{
  "affected": [
    {
      "package": {
        "ecosystem": "Rocky Linux:9",
        "name": "glibc",
        "purl": "pkg:rpm/rocky-linux/glibc?distro=rocky-linux-9\u0026epoch=0"
      },
      "ranges": [
        {
          "database_specific": {
            "yum_repository": "BaseOS"
          },
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "0:2.34-274.el9_8"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "credits": [
    {
      "name": "Rocky Enterprise Software Foundation"
    },
    {
      "name": "Red Hat"
    }
  ],
  "details": "The glibc packages provide the standard C libraries (libc), POSIX thread libraries (libpthread), standard math libraries (libm), and the name service cache daemon (nscd) used by multiple programs on the system. Without these libraries, the Linux system cannot function correctly.\n\nSecurity Fix(es):\n\n* glibc: glibc: Information disclosure or denial of service via ungetwc function with specific wide character encodings (CVE-2026-5928)\n\n* glibc: glibc: Out-of-bounds write via TSIG record processing (CVE-2026-5435)\n\n* glibc: glibc: Application crash or uninitialized memory read via crafted DNS response (CVE-2026-6238)\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.",
  "id": "RLSA-2026:42952",
  "modified": "2026-07-25T06:07:47.067947Z",
  "published": "2026-07-23T06:04:47.296368Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://errata.rockylinux.org/RLSA-2026:42952"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2459854"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2463465"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2463539"
    }
  ],
  "schema_version": "1.7.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Moderate: glibc security update",
  "upstream": [
    "CVE-2026-5435",
    "CVE-2026-5928",
    "CVE-2026-6238"
  ]
}



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