SUSE-SU-2026:21478-1

Vulnerability from csaf_suse - Published: 2026-05-05 13:07 - Updated: 2026-05-05 13:07
Summary
Security update for the Linux Kernel RT (Live Patch 18 for SUSE Linux Enterprise Micro 6.0)
Severity
Important
Notes
Title of the patch: Security update for the Linux Kernel RT (Live Patch 18 for SUSE Linux Enterprise Micro 6.0)
Description of the patch: This update for the SUSE Linux Enterprise Kernel 6.4.0-40.1 fixes various security issues The following security issues were fixed: - CVE-2026-23204: net/sched: cls_u32: use skb_header_pointer_careful() (bsc#1259126). - CVE-2026-31431: crypto: algif_aead - Revert to operating out-of-place (bsc#1263689).
Patchnames: SUSE-SLE-Micro-6.0-kernel-384
Terms of use: CSAF 2.0 data is provided by SUSE under the Creative Commons License 4.0 with Attribution (CC-BY-4.0).
CVE-2026-23204
7 (High)
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
Affected products
Product Identifier Version Remediation
Unresolved product id: SUSE Linux Micro 6.0:kernel-livepatch-6_4_0-40-rt-3-1.1.x86_64 —
Vendor Fix
Threats
Impact important
CVE-2026-31431
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Affected products
Product Identifier Version Remediation
Unresolved product id: SUSE Linux Micro 6.0:kernel-livepatch-6_4_0-40-rt-3-1.1.x86_64 —
Vendor Fix
Threats
Impact important
References
To clipboard 

{
  "document": {
    "aggregate_severity": {
      "namespace": "https://www.suse.com/support/security/rating/",
      "text": "important"
    },
    "category": "csaf_security_advisory",
    "csaf_version": "2.0",
    "distribution": {
      "text": "Copyright 2024 SUSE LLC. All rights reserved.",
      "tlp": {
        "label": "WHITE",
        "url": "https://www.first.org/tlp/"
      }
    },
    "lang": "en",
    "notes": [
      {
        "category": "summary",
        "text": "Security update for the Linux Kernel RT (Live Patch 18 for SUSE Linux Enterprise Micro 6.0)",
        "title": "Title of the patch"
      },
      {
        "category": "description",
        "text": "\nThis update for the SUSE Linux Enterprise Kernel 6.4.0-40.1 fixes various security issues\n\nThe following security issues were fixed:\n\n- CVE-2026-23204: net/sched: cls_u32: use skb_header_pointer_careful() (bsc#1259126).\n- CVE-2026-31431: crypto: algif_aead - Revert to operating out-of-place (bsc#1263689).\n\n",
        "title": "Description of the patch"
      },
      {
        "category": "details",
        "text": "SUSE-SLE-Micro-6.0-kernel-384",
        "title": "Patchnames"
      },
      {
        "category": "legal_disclaimer",
        "text": "CSAF 2.0 data is provided by SUSE under the Creative Commons License 4.0 with Attribution (CC-BY-4.0).",
        "title": "Terms of use"
      }
    ],
    "publisher": {
      "category": "vendor",
      "contact_details": "https://www.suse.com/support/security/contact/",
      "name": "SUSE Product Security Team",
      "namespace": "https://www.suse.com/"
    },
    "references": [
      {
        "category": "external",
        "summary": "SUSE ratings",
        "url": "https://www.suse.com/support/security/rating/"
      },
      {
        "category": "self",
        "summary": "URL of this CSAF notice",
        "url": "https://ftp.suse.com/pub/projects/security/csaf/suse-su-2026_21478-1.json"
      },
      {
        "category": "self",
        "summary": "URL for SUSE-SU-2026:21478-1",
        "url": "https://www.suse.com/support/update/announcement/2026/suse-su-202621478-1/"
      },
      {
        "category": "self",
        "summary": "E-Mail link for SUSE-SU-2026:21478-1",
        "url": "https://lists.suse.com/pipermail/sle-security-updates/2026-May/025871.html"
      },
      {
        "category": "self",
        "summary": "SUSE Bug 1259126",
        "url": "https://bugzilla.suse.com/1259126"
      },
      {
        "category": "self",
        "summary": "SUSE Bug 1263689",
        "url": "https://bugzilla.suse.com/1263689"
      },
      {
        "category": "self",
        "summary": "SUSE CVE CVE-2026-23204 page",
        "url": "https://www.suse.com/security/cve/CVE-2026-23204/"
      },
      {
        "category": "self",
        "summary": "SUSE CVE CVE-2026-31431 page",
        "url": "https://www.suse.com/security/cve/CVE-2026-31431/"
      }
    ],
    "title": "Security update for the Linux Kernel RT (Live Patch 18 for SUSE Linux Enterprise Micro 6.0)",
    "tracking": {
      "current_release_date": "2026-05-05T13:07:21Z",
      "generator": {
        "date": "2026-05-05T13:07:21Z",
        "engine": {
          "name": "cve-database.git:bin/generate-csaf.pl",
          "version": "1"
        }
      },
      "id": "SUSE-SU-2026:21478-1",
      "initial_release_date": "2026-05-05T13:07:21Z",
      "revision_history": [
        {
          "date": "2026-05-05T13:07:21Z",
          "number": "1",
          "summary": "Current version"
        }
      ],
      "status": "final",
      "version": "1"
    }
  },
  "product_tree": {
    "branches": [
      {
        "branches": [
          {
            "branches": [
              {
                "category": "product_version",
                "name": "kernel-livepatch-6_4_0-40-rt-3-1.1.x86_64",
                "product": {
                  "name": "kernel-livepatch-6_4_0-40-rt-3-1.1.x86_64",
                  "product_id": "kernel-livepatch-6_4_0-40-rt-3-1.1.x86_64"
                }
              }
            ],
            "category": "architecture",
            "name": "x86_64"
          },
          {
            "branches": [
              {
                "category": "product_name",
                "name": "SUSE Linux Micro 6.0",
                "product": {
                  "name": "SUSE Linux Micro 6.0",
                  "product_id": "SUSE Linux Micro 6.0",
                  "product_identification_helper": {
                    "cpe": "cpe:/o:suse:sl-micro:6.0"
                  }
                }
              }
            ],
            "category": "product_family",
            "name": "SUSE Linux Enterprise"
          }
        ],
        "category": "vendor",
        "name": "SUSE"
      }
    ],
    "relationships": [
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        "category": "default_component_of",
        "full_product_name": {
          "name": "kernel-livepatch-6_4_0-40-rt-3-1.1.x86_64 as component of SUSE Linux Micro 6.0",
          "product_id": "SUSE Linux Micro 6.0:kernel-livepatch-6_4_0-40-rt-3-1.1.x86_64"
        },
        "product_reference": "kernel-livepatch-6_4_0-40-rt-3-1.1.x86_64",
        "relates_to_product_reference": "SUSE Linux Micro 6.0"
      }
    ]
  },
  "vulnerabilities": [
    {
      "cve": "CVE-2026-23204",
      "ids": [
        {
          "system_name": "SUSE CVE Page",
          "text": "https://www.suse.com/security/cve/CVE-2026-23204"
        }
      ],
      "notes": [
        {
          "category": "general",
          "text": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet/sched: cls_u32: use skb_header_pointer_careful()\n\nskb_header_pointer() does not fully validate negative @offset values.\n\nUse skb_header_pointer_careful() instead.\n\nGangMin Kim provided a report and a repro fooling u32_classify():\n\nBUG: KASAN: slab-out-of-bounds in u32_classify+0x1180/0x11b0\nnet/sched/cls_u32.c:221",
          "title": "CVE description"
        }
      ],
      "product_status": {
        "recommended": [
          "SUSE Linux Micro 6.0:kernel-livepatch-6_4_0-40-rt-3-1.1.x86_64"
        ]
      },
      "references": [
        {
          "category": "external",
          "summary": "CVE-2026-23204",
          "url": "https://www.suse.com/security/cve/CVE-2026-23204"
        },
        {
          "category": "external",
          "summary": "SUSE Bug 1258340 for CVE-2026-23204",
          "url": "https://bugzilla.suse.com/1258340"
        },
        {
          "category": "external",
          "summary": "SUSE Bug 1259126 for CVE-2026-23204",
          "url": "https://bugzilla.suse.com/1259126"
        }
      ],
      "remediations": [
        {
          "category": "vendor_fix",
          "details": "To install this SUSE Security Update use the SUSE recommended installation methods like YaST online_update or \"zypper patch\".\n",
          "product_ids": [
            "SUSE Linux Micro 6.0:kernel-livepatch-6_4_0-40-rt-3-1.1.x86_64"
          ]
        }
      ],
      "scores": [
        {
          "cvss_v3": {
            "baseScore": 7,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "products": [
            "SUSE Linux Micro 6.0:kernel-livepatch-6_4_0-40-rt-3-1.1.x86_64"
          ]
        }
      ],
      "threats": [
        {
          "category": "impact",
          "date": "2026-05-05T13:07:21Z",
          "details": "important"
        }
      ],
      "title": "CVE-2026-23204"
    },
    {
      "cve": "CVE-2026-31431",
      "ids": [
        {
          "system_name": "SUSE CVE Page",
          "text": "https://www.suse.com/security/cve/CVE-2026-31431"
        }
      ],
      "notes": [
        {
          "category": "general",
          "text": "In the Linux kernel, the following vulnerability has been resolved:\n\ncrypto: algif_aead - Revert to operating out-of-place\n\nThis mostly reverts commit 72548b093ee3 except for the copying of\nthe associated data.\n\nThere is no benefit in operating in-place in algif_aead since the\nsource and destination come from different mappings.  Get rid of\nall the complexity added for in-place operation and just copy the\nAD directly.",
          "title": "CVE description"
        }
      ],
      "product_status": {
        "recommended": [
          "SUSE Linux Micro 6.0:kernel-livepatch-6_4_0-40-rt-3-1.1.x86_64"
        ]
      },
      "references": [
        {
          "category": "external",
          "summary": "CVE-2026-31431",
          "url": "https://www.suse.com/security/cve/CVE-2026-31431"
        },
        {
          "category": "external",
          "summary": "SUSE Bug 1262573 for CVE-2026-31431",
          "url": "https://bugzilla.suse.com/1262573"
        },
        {
          "category": "external",
          "summary": "SUSE Bug 1263689 for CVE-2026-31431",
          "url": "https://bugzilla.suse.com/1263689"
        }
      ],
      "remediations": [
        {
          "category": "vendor_fix",
          "details": "To install this SUSE Security Update use the SUSE recommended installation methods like YaST online_update or \"zypper patch\".\n",
          "product_ids": [
            "SUSE Linux Micro 6.0:kernel-livepatch-6_4_0-40-rt-3-1.1.x86_64"
          ]
        }
      ],
      "scores": [
        {
          "cvss_v3": {
            "baseScore": 7.8,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "products": [
            "SUSE Linux Micro 6.0:kernel-livepatch-6_4_0-40-rt-3-1.1.x86_64"
          ]
        }
      ],
      "threats": [
        {
          "category": "impact",
          "date": "2026-05-05T13:07:21Z",
          "details": "important"
        }
      ],
      "title": "CVE-2026-31431"
    }
  ]
}


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Sightings

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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.
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  • 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.


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