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SUSE-SU-2026:21520-1

Vulnerability from csaf_suse - Published: 2026-05-05 17:30 - Updated: 2026-05-05 17:30
Summary
Security update for the Linux Kernel RT (Live Patch 7 for SUSE Linux Enterprise 16)
Severity
Important
Notes
Title of the patch: Security update for the Linux Kernel RT (Live Patch 7 for SUSE Linux Enterprise 16)
Description of the patch: This update for the SUSE Linux Enterprise Kernel 6.12.0-160000.28.1 fixes various security issues The following security issues were fixed: - CVE-2026-23437: net: shaper: protect late read accesses to the hierarchy (bsc#1261845). - CVE-2026-31406: xfrm: Fix work re-schedule after cancel in xfrm_nat_keepalive_net_fini() (bsc#1261630). - CVE-2026-31431: crypto: algif_aead - Revert to operating out-of-place (bsc#1263689).
Patchnames: SUSE-SL-Micro-6.2-688
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-2026-23437
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 6.2:kernel-livepatch-6_12_0-160000_28-rt-2-160000.1.1.x86_64 —
Vendor Fix
Threats
Impact important
CVE-2026-31406
7 (High)
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
Affected products
Recommended 1 product, the same list as for CVE-2026-23437
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
Recommended 1 product, the same list as for CVE-2026-23437
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 7 for SUSE Linux Enterprise 16)",
        "title": "Title of the patch"
      },
      {
        "category": "description",
        "text": "\nThis update for the SUSE Linux Enterprise Kernel 6.12.0-160000.28.1 fixes various security issues\n\nThe following security issues were fixed:\n\n- CVE-2026-23437: net: shaper: protect late read accesses to the hierarchy (bsc#1261845).\n- CVE-2026-31406: xfrm: Fix work re-schedule after cancel in xfrm_nat_keepalive_net_fini() (bsc#1261630).\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-SL-Micro-6.2-688",
        "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_21520-1.json"
      },
      {
        "category": "self",
        "summary": "URL for SUSE-SU-2026:21520-1",
        "url": "https://www.suse.com/support/update/announcement/2026/suse-su-202621520-1/"
      },
      {
        "category": "self",
        "summary": "E-Mail link for SUSE-SU-2026:21520-1",
        "url": "https://lists.suse.com/pipermail/sle-security-updates/2026-May/025994.html"
      },
      {
        "category": "self",
        "summary": "SUSE Bug 1261630",
        "url": "https://bugzilla.suse.com/1261630"
      },
      {
        "category": "self",
        "summary": "SUSE Bug 1261845",
        "url": "https://bugzilla.suse.com/1261845"
      },
      {
        "category": "self",
        "summary": "SUSE Bug 1263689",
        "url": "https://bugzilla.suse.com/1263689"
      },
      {
        "category": "self",
        "summary": "SUSE CVE CVE-2026-23437 page",
        "url": "https://www.suse.com/security/cve/CVE-2026-23437/"
      },
      {
        "category": "self",
        "summary": "SUSE CVE CVE-2026-31406 page",
        "url": "https://www.suse.com/security/cve/CVE-2026-31406/"
      },
      {
        "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 7 for SUSE Linux Enterprise 16)",
    "tracking": {
      "current_release_date": "2026-05-05T17:30:28Z",
      "generator": {
        "date": "2026-05-05T17:30:28Z",
        "engine": {
          "name": "cve-database.git:bin/generate-csaf.pl",
          "version": "1"
        }
      },
      "id": "SUSE-SU-2026:21520-1",
      "initial_release_date": "2026-05-05T17:30:28Z",
      "revision_history": [
        {
          "date": "2026-05-05T17:30:28Z",
          "number": "1",
          "summary": "Current version"
        }
      ],
      "status": "final",
      "version": "1"
    }
  },
  "product_tree": {
    "branches": [
      {
        "branches": [
          {
            "branches": [
              {
                "category": "product_version",
                "name": "kernel-livepatch-6_12_0-160000_28-rt-2-160000.1.1.x86_64",
                "product": {
                  "name": "kernel-livepatch-6_12_0-160000_28-rt-2-160000.1.1.x86_64",
                  "product_id": "kernel-livepatch-6_12_0-160000_28-rt-2-160000.1.1.x86_64"
                }
              }
            ],
            "category": "architecture",
            "name": "x86_64"
          },
          {
            "branches": [
              {
                "category": "product_name",
                "name": "SUSE Linux Micro 6.2",
                "product": {
                  "name": "SUSE Linux Micro 6.2",
                  "product_id": "SUSE Linux Micro 6.2",
                  "product_identification_helper": {
                    "cpe": "cpe:/o:suse:sl-micro:6.2"
                  }
                }
              }
            ],
            "category": "product_family",
            "name": "SUSE Linux Enterprise"
          }
        ],
        "category": "vendor",
        "name": "SUSE"
      }
    ],
    "relationships": [
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          "name": "kernel-livepatch-6_12_0-160000_28-rt-2-160000.1.1.x86_64 as component of SUSE Linux Micro 6.2",
          "product_id": "SUSE Linux Micro 6.2:kernel-livepatch-6_12_0-160000_28-rt-2-160000.1.1.x86_64"
        },
        "product_reference": "kernel-livepatch-6_12_0-160000_28-rt-2-160000.1.1.x86_64",
        "relates_to_product_reference": "SUSE Linux Micro 6.2"
      }
    ]
  },
  "vulnerabilities": [
    {
      "cve": "CVE-2026-23437",
      "ids": [
        {
          "system_name": "SUSE CVE Page",
          "text": "https://www.suse.com/security/cve/CVE-2026-23437"
        }
      ],
      "notes": [
        {
          "category": "general",
          "text": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: shaper: protect late read accesses to the hierarchy\n\nWe look up a netdev during prep of Netlink ops (pre- callbacks)\nand take a ref to it. Then later in the body of the callback\nwe take its lock or RCU which are the actual protections.\n\nThis is not proper, a conversion from a ref to a locked netdev\nmust include a liveness check (a check if the netdev hasn\u0027t been\nunregistered already). Fix the read cases (those under RCU).\nWrites needs a separate change to protect from creating the\nhierarchy after flush has already run.",
          "title": "CVE description"
        }
      ],
      "product_status": {
        "recommended": [
          "SUSE Linux Micro 6.2:kernel-livepatch-6_12_0-160000_28-rt-2-160000.1.1.x86_64"
        ]
      },
      "references": [
        {
          "category": "external",
          "summary": "CVE-2026-23437",
          "url": "https://www.suse.com/security/cve/CVE-2026-23437"
        },
        {
          "category": "external",
          "summary": "SUSE Bug 1261635 for CVE-2026-23437",
          "url": "https://bugzilla.suse.com/1261635"
        },
        {
          "category": "external",
          "summary": "SUSE Bug 1261845 for CVE-2026-23437",
          "url": "https://bugzilla.suse.com/1261845"
        }
      ],
      "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 6.2:kernel-livepatch-6_12_0-160000_28-rt-2-160000.1.1.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 6.2:kernel-livepatch-6_12_0-160000_28-rt-2-160000.1.1.x86_64"
          ]
        }
      ],
      "threats": [
        {
          "category": "impact",
          "date": "2026-05-05T17:30:28Z",
          "details": "important"
        }
      ],
      "title": "CVE-2026-23437"
    },
    {
      "cve": "CVE-2026-31406",
      "ids": [
        {
          "system_name": "SUSE CVE Page",
          "text": "https://www.suse.com/security/cve/CVE-2026-31406"
        }
      ],
      "notes": [
        {
          "category": "general",
          "text": "In the Linux kernel, the following vulnerability has been resolved:\n\nxfrm: Fix work re-schedule after cancel in xfrm_nat_keepalive_net_fini()\n\nAfter cancel_delayed_work_sync() is called from\nxfrm_nat_keepalive_net_fini(), xfrm_state_fini() flushes remaining\nstates via __xfrm_state_delete(), which calls\nxfrm_nat_keepalive_state_updated() to re-schedule nat_keepalive_work.\n\nThe following is a simple race scenario:\n\n           cpu0                             cpu1\n\ncleanup_net() [Round 1]\n  ops_undo_list()\n    xfrm_net_exit()\n      xfrm_nat_keepalive_net_fini()\n        cancel_delayed_work_sync(nat_keepalive_work);\n      xfrm_state_fini()\n        xfrm_state_flush()\n          xfrm_state_delete(x)\n            __xfrm_state_delete(x)\n              xfrm_nat_keepalive_state_updated(x)\n                schedule_delayed_work(nat_keepalive_work);\n  rcu_barrier();\n  net_complete_free();\n  net_passive_dec(net);\n    llist_add(\u0026net-\u003edefer_free_list, \u0026defer_free_list);\n\ncleanup_net() [Round 2]\n  rcu_barrier();\n  net_complete_free()\n    kmem_cache_free(net_cachep, net);\n                                     nat_keepalive_work()\n                                       // on freed net\n\nTo prevent this, cancel_delayed_work_sync() is replaced with\ndisable_delayed_work_sync().",
          "title": "CVE description"
        }
      ],
      "product_status": {
        "recommended": [
          "SUSE Linux Micro 6.2:kernel-livepatch-6_12_0-160000_28-rt-2-160000.1.1.x86_64"
        ]
      },
      "references": [
        {
          "category": "external",
          "summary": "CVE-2026-31406",
          "url": "https://www.suse.com/security/cve/CVE-2026-31406"
        },
        {
          "category": "external",
          "summary": "SUSE Bug 1261629 for CVE-2026-31406",
          "url": "https://bugzilla.suse.com/1261629"
        },
        {
          "category": "external",
          "summary": "SUSE Bug 1261630 for CVE-2026-31406",
          "url": "https://bugzilla.suse.com/1261630"
        }
      ],
      "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 6.2:kernel-livepatch-6_12_0-160000_28-rt-2-160000.1.1.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 6.2:kernel-livepatch-6_12_0-160000_28-rt-2-160000.1.1.x86_64"
          ]
        }
      ],
      "threats": [
        {
          "category": "impact",
          "date": "2026-05-05T17:30:28Z",
          "details": "important"
        }
      ],
      "title": "CVE-2026-31406"
    },
    {
      "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 6.2:kernel-livepatch-6_12_0-160000_28-rt-2-160000.1.1.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"
        },
        {
          "category": "external",
          "summary": "SUSE Bug 1263938 for CVE-2026-31431",
          "url": "https://bugzilla.suse.com/1263938"
        },
        {
          "category": "external",
          "summary": "SUSE Bug 1263939 for CVE-2026-31431",
          "url": "https://bugzilla.suse.com/1263939"
        },
        {
          "category": "external",
          "summary": "SUSE Bug 1264274 for CVE-2026-31431",
          "url": "https://bugzilla.suse.com/1264274"
        }
      ],
      "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 6.2:kernel-livepatch-6_12_0-160000_28-rt-2-160000.1.1.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 6.2:kernel-livepatch-6_12_0-160000_28-rt-2-160000.1.1.x86_64"
          ]
        }
      ],
      "threats": [
        {
          "category": "impact",
          "date": "2026-05-05T17:30:28Z",
          "details": "important"
        }
      ],
      "title": "CVE-2026-31431"
    }
  ]
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

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.


Detection rules are retrieved from Rulezet.


Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.