SUSE-SU-2026:21521-1

Vulnerability from csaf_suse - Published: 2026-05-05 17:32 - Updated: 2026-05-05 17:32
Summary
Security update for the Linux Kernel RT (Live Patch 6 for SUSE Linux Enterprise 16)
Severity
Important
Notes
Title of the patch: Security update for the Linux Kernel RT (Live Patch 6 for SUSE Linux Enterprise 16)
Description of the patch: This update for the SUSE Linux Enterprise Kernel 6.12.0-160000.27.1 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-2026-23437: 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-6.2-689
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 6.2:kernel-livepatch-6_12_0-160000_27-rt-3-160000.1.1.x86_64 —
Vendor Fix
Threats
Impact important
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_27-rt-3-160000.1.1.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
Product Identifier Version Remediation
Unresolved product id: SUSE Linux Micro 6.2:kernel-livepatch-6_12_0-160000_27-rt-3-160000.1.1.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 6.2:kernel-livepatch-6_12_0-160000_27-rt-3-160000.1.1.x86_64 —
Vendor Fix
Threats
Impact important
References
To clipboard 

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    "category": "csaf_security_advisory",
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        "text": "\nThis update for the SUSE Linux Enterprise Kernel 6.12.0-160000.27.1 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-2026-23437: 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"
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        "text": "SUSE-SL-Micro-6.2-689",
        "title": "Patchnames"
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        "summary": "SUSE Bug 1261630",
        "url": "https://bugzilla.suse.com/1261630"
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        "summary": "SUSE Bug 1261845",
        "url": "https://bugzilla.suse.com/1261845"
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        "summary": "SUSE Bug 1263689",
        "url": "https://bugzilla.suse.com/1263689"
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        "url": "https://www.suse.com/security/cve/CVE-2026-23437/"
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          "summary": "Current version"
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                "category": "product_version",
                "name": "kernel-livepatch-6_12_0-160000_27-rt-3-160000.1.1.x86_64",
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        },
        "product_reference": "kernel-livepatch-6_12_0-160000_27-rt-3-160000.1.1.x86_64",
        "relates_to_product_reference": "SUSE Linux Micro 6.2"
      }
    ]
  },
  "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 6.2:kernel-livepatch-6_12_0-160000_27-rt-3-160000.1.1.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 6.2:kernel-livepatch-6_12_0-160000_27-rt-3-160000.1.1.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_27-rt-3-160000.1.1.x86_64"
          ]
        }
      ],
      "threats": [
        {
          "category": "impact",
          "date": "2026-05-05T17:32:16Z",
          "details": "important"
        }
      ],
      "title": "CVE-2026-23204"
    },
    {
      "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_27-rt-3-160000.1.1.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_27-rt-3-160000.1.1.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"
          },
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            "SUSE Linux Micro 6.2:kernel-livepatch-6_12_0-160000_27-rt-3-160000.1.1.x86_64"
          ]
        }
      ],
      "threats": [
        {
          "category": "impact",
          "date": "2026-05-05T17:32:16Z",
          "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_27-rt-3-160000.1.1.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_27-rt-3-160000.1.1.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_27-rt-3-160000.1.1.x86_64"
          ]
        }
      ],
      "threats": [
        {
          "category": "impact",
          "date": "2026-05-05T17:32:16Z",
          "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_27-rt-3-160000.1.1.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_27-rt-3-160000.1.1.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_27-rt-3-160000.1.1.x86_64"
          ]
        }
      ],
      "threats": [
        {
          "category": "impact",
          "date": "2026-05-05T17:32:16Z",
          "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.