SUSE-SU-2026:21684-1

Vulnerability from csaf_suse - Published: 2026-05-15 16:43 - Updated: 2026-05-15 16:43
Summary
Security update for the Linux Kernel
Severity
Important
Notes
Title of the patch: Security update for the Linux Kernel
Description of the patch: The SUSE Linux Enterprise Micro 6.0 and Micro 6.1 RT kernel was updated to fix various security issues The following security issues were fixed: - CVE-2025-54518: x86/CPU/AMD: Prevent improper isolation of shared resources in Zen2's op cache (bsc#1264013). - CVE-2026-46300: net: skbuff: propagate shared-frag marker through pskb_copy() (bsc#1265209). - CVE-2026-43500: rxrpc: unshare DATA/RESPONSE packets when paged frags are present (bsc#1264450). The following non security issues were fixed: - config: s390x/ppc64le: disable unsupported CONFIG_AFS_FS and CONFIG_AF_RXRPC (bsc#1264450). - io-wq: check that the predecessor is hashed in io_wq_remove_pending() (git-fixes).
Patchnames: SUSE-SLE-Micro-6.0-kernel-427
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-2025-54518
7.4 (High)
CVSS:3.1/AV:L/AC:H/PR:N/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-devel-rt-6.4.0-45.1.noarch —
Vendor Fix
Unresolved product id: SUSE Linux Micro 6.0:kernel-rt-6.4.0-45.1.x86_64 —
Vendor Fix
Unresolved product id: SUSE Linux Micro 6.0:kernel-rt-livepatch-6.4.0-45.1.x86_64 —
Vendor Fix
Unresolved product id: SUSE Linux Micro 6.0:kernel-source-rt-6.4.0-45.1.noarch —
Vendor Fix
Threats
Impact important
CVE-2026-43500
8.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
Affected products
Product Identifier Version Remediation
Unresolved product id: SUSE Linux Micro 6.0:kernel-devel-rt-6.4.0-45.1.noarch —
Vendor Fix
Unresolved product id: SUSE Linux Micro 6.0:kernel-rt-6.4.0-45.1.x86_64 —
Vendor Fix
Unresolved product id: SUSE Linux Micro 6.0:kernel-rt-livepatch-6.4.0-45.1.x86_64 —
Vendor Fix
Unresolved product id: SUSE Linux Micro 6.0:kernel-source-rt-6.4.0-45.1.noarch —
Vendor Fix
Threats
Impact important
CVE-2026-46300
8.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
Affected products
Product Identifier Version Remediation
Unresolved product id: SUSE Linux Micro 6.0:kernel-devel-rt-6.4.0-45.1.noarch —
Vendor Fix
Unresolved product id: SUSE Linux Micro 6.0:kernel-rt-6.4.0-45.1.x86_64 —
Vendor Fix
Unresolved product id: SUSE Linux Micro 6.0:kernel-rt-livepatch-6.4.0-45.1.x86_64 —
Vendor Fix
Unresolved product id: SUSE Linux Micro 6.0:kernel-source-rt-6.4.0-45.1.noarch —
Vendor Fix
Threats
Impact important
References
To clipboard 

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  "vulnerabilities": [
    {
      "cve": "CVE-2025-54518",
      "ids": [
        {
          "system_name": "SUSE CVE Page",
          "text": "https://www.suse.com/security/cve/CVE-2025-54518"
        }
      ],
      "notes": [
        {
          "category": "general",
          "text": "Improper isolation of shared resources within the CPU operation cache on Zen 2-based products could allow an attacker to corrupt instructions executed at a different privilege level, potentially resulting in privilege escalation.",
          "title": "CVE description"
        }
      ],
      "product_status": {
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          "SUSE Linux Micro 6.0:kernel-rt-livepatch-6.4.0-45.1.x86_64",
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        ]
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          "url": "https://www.suse.com/security/cve/CVE-2025-54518"
        },
        {
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          "summary": "SUSE Bug 1264013 for CVE-2025-54518",
          "url": "https://bugzilla.suse.com/1264013"
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        {
          "category": "external",
          "summary": "SUSE Bug 1264066 for CVE-2025-54518",
          "url": "https://bugzilla.suse.com/1264066"
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          "category": "external",
          "summary": "SUSE Bug 1264096 for CVE-2025-54518",
          "url": "https://bugzilla.suse.com/1264096"
        }
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          "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-devel-rt-6.4.0-45.1.noarch",
            "SUSE Linux Micro 6.0:kernel-rt-6.4.0-45.1.x86_64",
            "SUSE Linux Micro 6.0:kernel-rt-livepatch-6.4.0-45.1.x86_64",
            "SUSE Linux Micro 6.0:kernel-source-rt-6.4.0-45.1.noarch"
          ]
        }
      ],
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            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "products": [
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            "SUSE Linux Micro 6.0:kernel-rt-6.4.0-45.1.x86_64",
            "SUSE Linux Micro 6.0:kernel-rt-livepatch-6.4.0-45.1.x86_64",
            "SUSE Linux Micro 6.0:kernel-source-rt-6.4.0-45.1.noarch"
          ]
        }
      ],
      "threats": [
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          "date": "2026-05-15T16:43:03Z",
          "details": "important"
        }
      ],
      "title": "CVE-2025-54518"
    },
    {
      "cve": "CVE-2026-43500",
      "ids": [
        {
          "system_name": "SUSE CVE Page",
          "text": "https://www.suse.com/security/cve/CVE-2026-43500"
        }
      ],
      "notes": [
        {
          "category": "general",
          "text": "In the Linux kernel, the following vulnerability has been resolved:\n\nrxrpc: Also unshare DATA/RESPONSE packets when paged frags are present\n\nThe DATA-packet handler in rxrpc_input_call_event() and the RESPONSE\nhandler in rxrpc_verify_response() copy the skb to a linear one before\ncalling into the security ops only when skb_cloned() is true.  An skb\nthat is not cloned but still carries externally-owned paged fragments\n(e.g. SKBFL_SHARED_FRAG set by splice() into a UDP socket via\n__ip_append_data, or a chained skb_has_frag_list()) falls through to\nthe in-place decryption path, which binds the frag pages directly into\nthe AEAD/skcipher SGL via skb_to_sgvec().\n\nExtend the gate to also unshare when skb_has_frag_list() or\nskb_has_shared_frag() is true.  This catches the splice-loopback vector\nand other externally-shared frag sources while preserving the\nzero-copy fast path for skbs whose frags are kernel-private (e.g. NIC\npage_pool RX, GRO).  The OOM/trace handling already in place is reused.",
          "title": "CVE description"
        }
      ],
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          "SUSE Linux Micro 6.0:kernel-rt-livepatch-6.4.0-45.1.x86_64",
          "SUSE Linux Micro 6.0:kernel-source-rt-6.4.0-45.1.noarch"
        ]
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          "url": "https://www.suse.com/security/cve/CVE-2026-43500"
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          "summary": "SUSE Bug 1264450 for CVE-2026-43500",
          "url": "https://bugzilla.suse.com/1264450"
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          "summary": "SUSE Bug 1264458 for CVE-2026-43500",
          "url": "https://bugzilla.suse.com/1264458"
        },
        {
          "category": "external",
          "summary": "SUSE Bug 1265383 for CVE-2026-43500",
          "url": "https://bugzilla.suse.com/1265383"
        }
      ],
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          "details": "To install this SUSE Security Update use the SUSE recommended installation methods like YaST online_update or \"zypper patch\".\n",
          "product_ids": [
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            "SUSE Linux Micro 6.0:kernel-rt-livepatch-6.4.0-45.1.x86_64",
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          ]
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      ],
      "scores": [
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            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H",
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          },
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            "SUSE Linux Micro 6.0:kernel-source-rt-6.4.0-45.1.noarch"
          ]
        }
      ],
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        {
          "category": "impact",
          "date": "2026-05-15T16:43:03Z",
          "details": "important"
        }
      ],
      "title": "CVE-2026-43500"
    },
    {
      "cve": "CVE-2026-46300",
      "ids": [
        {
          "system_name": "SUSE CVE Page",
          "text": "https://www.suse.com/security/cve/CVE-2026-46300"
        }
      ],
      "notes": [
        {
          "category": "general",
          "text": "unknown",
          "title": "CVE description"
        }
      ],
      "product_status": {
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          "SUSE Linux Micro 6.0:kernel-rt-livepatch-6.4.0-45.1.x86_64",
          "SUSE Linux Micro 6.0:kernel-source-rt-6.4.0-45.1.noarch"
        ]
      },
      "references": [
        {
          "category": "external",
          "summary": "CVE-2026-46300",
          "url": "https://www.suse.com/security/cve/CVE-2026-46300"
        },
        {
          "category": "external",
          "summary": "SUSE Bug 1265209 for CVE-2026-46300",
          "url": "https://bugzilla.suse.com/1265209"
        },
        {
          "category": "external",
          "summary": "SUSE Bug 1265226 for CVE-2026-46300",
          "url": "https://bugzilla.suse.com/1265226"
        },
        {
          "category": "external",
          "summary": "SUSE Bug 1265312 for CVE-2026-46300",
          "url": "https://bugzilla.suse.com/1265312"
        },
        {
          "category": "external",
          "summary": "SUSE Bug 1265383 for CVE-2026-46300",
          "url": "https://bugzilla.suse.com/1265383"
        }
      ],
      "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-devel-rt-6.4.0-45.1.noarch",
            "SUSE Linux Micro 6.0:kernel-rt-6.4.0-45.1.x86_64",
            "SUSE Linux Micro 6.0:kernel-rt-livepatch-6.4.0-45.1.x86_64",
            "SUSE Linux Micro 6.0:kernel-source-rt-6.4.0-45.1.noarch"
          ]
        }
      ],
      "scores": [
        {
          "cvss_v3": {
            "baseScore": 8.8,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H",
            "version": "3.1"
          },
          "products": [
            "SUSE Linux Micro 6.0:kernel-devel-rt-6.4.0-45.1.noarch",
            "SUSE Linux Micro 6.0:kernel-rt-6.4.0-45.1.x86_64",
            "SUSE Linux Micro 6.0:kernel-rt-livepatch-6.4.0-45.1.x86_64",
            "SUSE Linux Micro 6.0:kernel-source-rt-6.4.0-45.1.noarch"
          ]
        }
      ],
      "threats": [
        {
          "category": "impact",
          "date": "2026-05-15T16:43:03Z",
          "details": "important"
        }
      ],
      "title": "CVE-2026-46300"
    }
  ]
}


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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.