SUSE-SU-2026:21673-1

Vulnerability from csaf_suse - Published: 2026-05-15 12:22 - Updated: 2026-09-20 18:38
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 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). The following non security issue was fixed: - io-wq: check that the predecessor is hashed in io_wq_remove_pending() (git-fixes).
Patchnames: SUSE-SLE-Micro-6.0-kernel-429
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-default-0:6.4.0-44.1.aarch64 —
Vendor Fix
Unresolved product id: SUSE Linux Micro 6.0:kernel-default-0:6.4.0-44.1.s390x —
Vendor Fix
Unresolved product id: SUSE Linux Micro 6.0:kernel-default-0:6.4.0-44.1.x86_64 —
Vendor Fix
Unresolved product id: SUSE Linux Micro 6.0:kernel-default-base-0:6.4.0-44.1.21.21.aarch64 —
Vendor Fix
Unresolved product id: SUSE Linux Micro 6.0:kernel-default-base-0:6.4.0-44.1.21.21.x86_64 —
Vendor Fix
Unresolved product id: SUSE Linux Micro 6.0:kernel-default-livepatch-0:6.4.0-44.1.s390x —
Vendor Fix
Unresolved product id: SUSE Linux Micro 6.0:kernel-default-livepatch-0:6.4.0-44.1.x86_64 —
Vendor Fix
Unresolved product id: SUSE Linux Micro 6.0:kernel-devel-0:6.4.0-44.1.noarch —
Vendor Fix
Unresolved product id: SUSE Linux Micro 6.0:kernel-kvmsmall-0:6.4.0-44.1.x86_64 —
Vendor Fix
Unresolved product id: SUSE Linux Micro 6.0:kernel-macros-0:6.4.0-44.1.noarch —
Vendor Fix
Unresolved product id: SUSE Linux Micro 6.0:kernel-source-0:6.4.0-44.1.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
Recommended 11 products, the same list as for CVE-2025-54518
Threats
Impact important
References
To clipboard 

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        {
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          "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"
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        {
          "category": "external",
          "summary": "SUSE Bug 1264096 for CVE-2025-54518",
          "url": "https://bugzilla.suse.com/1264096"
        }
      ],
      "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-default-0:6.4.0-44.1.aarch64",
            "SUSE Linux Micro 6.0:kernel-default-0:6.4.0-44.1.s390x",
            "SUSE Linux Micro 6.0:kernel-default-0:6.4.0-44.1.x86_64",
            "SUSE Linux Micro 6.0:kernel-default-base-0:6.4.0-44.1.21.21.aarch64",
            "SUSE Linux Micro 6.0:kernel-default-base-0:6.4.0-44.1.21.21.x86_64",
            "SUSE Linux Micro 6.0:kernel-default-livepatch-0:6.4.0-44.1.s390x",
            "SUSE Linux Micro 6.0:kernel-default-livepatch-0:6.4.0-44.1.x86_64",
            "SUSE Linux Micro 6.0:kernel-devel-0:6.4.0-44.1.noarch",
            "SUSE Linux Micro 6.0:kernel-kvmsmall-0:6.4.0-44.1.x86_64",
            "SUSE Linux Micro 6.0:kernel-macros-0:6.4.0-44.1.noarch",
            "SUSE Linux Micro 6.0:kernel-source-0:6.4.0-44.1.noarch"
          ]
        }
      ],
      "scores": [
        {
          "cvss_v3": {
            "baseScore": 7.4,
            "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": [
            "SUSE Linux Micro 6.0:kernel-default-0:6.4.0-44.1.aarch64",
            "SUSE Linux Micro 6.0:kernel-default-0:6.4.0-44.1.s390x",
            "SUSE Linux Micro 6.0:kernel-default-0:6.4.0-44.1.x86_64",
            "SUSE Linux Micro 6.0:kernel-default-base-0:6.4.0-44.1.21.21.aarch64",
            "SUSE Linux Micro 6.0:kernel-default-base-0:6.4.0-44.1.21.21.x86_64",
            "SUSE Linux Micro 6.0:kernel-default-livepatch-0:6.4.0-44.1.s390x",
            "SUSE Linux Micro 6.0:kernel-default-livepatch-0:6.4.0-44.1.x86_64",
            "SUSE Linux Micro 6.0:kernel-devel-0:6.4.0-44.1.noarch",
            "SUSE Linux Micro 6.0:kernel-kvmsmall-0:6.4.0-44.1.x86_64",
            "SUSE Linux Micro 6.0:kernel-macros-0:6.4.0-44.1.noarch",
            "SUSE Linux Micro 6.0:kernel-source-0:6.4.0-44.1.noarch"
          ]
        }
      ],
      "threats": [
        {
          "category": "impact",
          "date": "2026-05-15T12:22:55Z",
          "details": "important"
        }
      ],
      "title": "CVE-2025-54518"
    },
    {
      "cve": "CVE-2026-46300",
      "ids": [
        {
          "system_name": "SUSE CVE Page",
          "text": "https://www.suse.com/security/cve/CVE-2026-46300"
        }
      ],
      "notes": [
        {
          "category": "general",
          "text": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: skbuff: preserve shared-frag marker during coalescing\n\nskb_try_coalesce() can attach paged frags from @from to @to.  If @from\nhas SKBFL_SHARED_FRAG set, the resulting @to skb can contain the same\nexternally-owned or page-cache-backed frags, but the shared-frag marker\nis currently lost.\n\nThat breaks the invariant relied on by later in-place writers.  In\nparticular, ESP input checks skb_has_shared_frag() before deciding\nwhether an uncloned nonlinear skb can skip skb_cow_data().  If TCP\nreceive coalescing has moved shared frags into an unmarked skb, ESP can\nsee skb_has_shared_frag() as false and decrypt in place over page-cache\nbacked frags.\n\nPropagate SKBFL_SHARED_FRAG when skb_try_coalesce() transfers paged\nfrags.  The tailroom copy path does not need the marker because it copies\nbytes into @to\u0027s linear data rather than transferring frag descriptors.",
          "title": "CVE description"
        }
      ],
      "product_status": {
        "recommended": [
          "SUSE Linux Micro 6.0:kernel-default-0:6.4.0-44.1.aarch64",
          "SUSE Linux Micro 6.0:kernel-default-0:6.4.0-44.1.s390x",
          "SUSE Linux Micro 6.0:kernel-default-0:6.4.0-44.1.x86_64",
          "SUSE Linux Micro 6.0:kernel-default-base-0:6.4.0-44.1.21.21.aarch64",
          "SUSE Linux Micro 6.0:kernel-default-base-0:6.4.0-44.1.21.21.x86_64",
          "SUSE Linux Micro 6.0:kernel-default-livepatch-0:6.4.0-44.1.s390x",
          "SUSE Linux Micro 6.0:kernel-default-livepatch-0:6.4.0-44.1.x86_64",
          "SUSE Linux Micro 6.0:kernel-devel-0:6.4.0-44.1.noarch",
          "SUSE Linux Micro 6.0:kernel-kvmsmall-0:6.4.0-44.1.x86_64",
          "SUSE Linux Micro 6.0:kernel-macros-0:6.4.0-44.1.noarch",
          "SUSE Linux Micro 6.0:kernel-source-0:6.4.0-44.1.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"
        },
        {
          "category": "external",
          "summary": "SUSE Bug 1265960 for CVE-2026-46300",
          "url": "https://bugzilla.suse.com/1265960"
        },
        {
          "category": "external",
          "summary": "SUSE Bug 1271317 for CVE-2026-46300",
          "url": "https://bugzilla.suse.com/1271317"
        }
      ],
      "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-default-0:6.4.0-44.1.aarch64",
            "SUSE Linux Micro 6.0:kernel-default-0:6.4.0-44.1.s390x",
            "SUSE Linux Micro 6.0:kernel-default-0:6.4.0-44.1.x86_64",
            "SUSE Linux Micro 6.0:kernel-default-base-0:6.4.0-44.1.21.21.aarch64",
            "SUSE Linux Micro 6.0:kernel-default-base-0:6.4.0-44.1.21.21.x86_64",
            "SUSE Linux Micro 6.0:kernel-default-livepatch-0:6.4.0-44.1.s390x",
            "SUSE Linux Micro 6.0:kernel-default-livepatch-0:6.4.0-44.1.x86_64",
            "SUSE Linux Micro 6.0:kernel-devel-0:6.4.0-44.1.noarch",
            "SUSE Linux Micro 6.0:kernel-kvmsmall-0:6.4.0-44.1.x86_64",
            "SUSE Linux Micro 6.0:kernel-macros-0:6.4.0-44.1.noarch",
            "SUSE Linux Micro 6.0:kernel-source-0:6.4.0-44.1.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-default-0:6.4.0-44.1.aarch64",
            "SUSE Linux Micro 6.0:kernel-default-0:6.4.0-44.1.s390x",
            "SUSE Linux Micro 6.0:kernel-default-0:6.4.0-44.1.x86_64",
            "SUSE Linux Micro 6.0:kernel-default-base-0:6.4.0-44.1.21.21.aarch64",
            "SUSE Linux Micro 6.0:kernel-default-base-0:6.4.0-44.1.21.21.x86_64",
            "SUSE Linux Micro 6.0:kernel-default-livepatch-0:6.4.0-44.1.s390x",
            "SUSE Linux Micro 6.0:kernel-default-livepatch-0:6.4.0-44.1.x86_64",
            "SUSE Linux Micro 6.0:kernel-devel-0:6.4.0-44.1.noarch",
            "SUSE Linux Micro 6.0:kernel-kvmsmall-0:6.4.0-44.1.x86_64",
            "SUSE Linux Micro 6.0:kernel-macros-0:6.4.0-44.1.noarch",
            "SUSE Linux Micro 6.0:kernel-source-0:6.4.0-44.1.noarch"
          ]
        }
      ],
      "threats": [
        {
          "category": "impact",
          "date": "2026-05-15T12:22:55Z",
          "details": "important"
        }
      ],
      "title": "CVE-2026-46300"
    }
  ]
}



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Taxonomy of the tags.





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.



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.