SUSE-SU-2026:3344-1
Vulnerability from csaf_suse - Published: 2026-07-28 12:06 - Updated: 2026-07-28 12:06Summary
Security update for the Linux Kernel (Live Patch 26 for SUSE Linux Enterprise 15 SP6)
Severity
Important
Notes
Title of the patch: Security update for the Linux Kernel (Live Patch 26 for SUSE Linux Enterprise 15 SP6)
Description of the patch:
This update for the SUSE Linux Enterprise Kernel 6.4.0-150600.23.112 fixes various security issues:
The following security issues were fixed:
- CVE-2026-46113: KVM: x86: Fix shadow paging use-after-free due to unexpected GFN (bsc#1266970).
- CVE-2026-53359: KVM: x86: Fix shadow paging use-after-free due to unexpected role (bsc#1270060).
- CVE-2026-53366: ipv4: account for fraggap on the paged allocation path (bsc#1271370).
Patchnames: SUSE-2026-3344,SUSE-SLE-Module-Live-Patching-15-SP6-2026-3344
Terms of use: CSAF 2.0 data is provided by SUSE under the Creative Commons License 4.0 with Attribution (CC-BY-4.0).
8.8 (High)
Affected products
Recommended
3 products
| Product | Identifier | Version | Remediation |
|---|---|---|---|
| Unresolved product id: SUSE Linux Enterprise Live Patching 15 SP6:kernel-livepatch-6_4_0-150600_23_112-default-4-150600.2.1.ppc64le | — |
Vendor Fix
|
|
| Unresolved product id: SUSE Linux Enterprise Live Patching 15 SP6:kernel-livepatch-6_4_0-150600_23_112-default-4-150600.2.1.s390x | — |
Vendor Fix
|
|
| Unresolved product id: SUSE Linux Enterprise Live Patching 15 SP6:kernel-livepatch-6_4_0-150600_23_112-default-4-150600.2.1.x86_64 | — |
Vendor Fix
|
Threats
Impact
important
8.8 (High)
Affected products
Recommended
3 products
| Product | Identifier | Version | Remediation |
|---|---|---|---|
| Unresolved product id: SUSE Linux Enterprise Live Patching 15 SP6:kernel-livepatch-6_4_0-150600_23_112-default-4-150600.2.1.ppc64le | — |
Vendor Fix
|
|
| Unresolved product id: SUSE Linux Enterprise Live Patching 15 SP6:kernel-livepatch-6_4_0-150600_23_112-default-4-150600.2.1.s390x | — |
Vendor Fix
|
|
| Unresolved product id: SUSE Linux Enterprise Live Patching 15 SP6:kernel-livepatch-6_4_0-150600_23_112-default-4-150600.2.1.x86_64 | — |
Vendor Fix
|
Threats
Impact
important
8.5 (High)
Affected products
Recommended
3 products
| Product | Identifier | Version | Remediation |
|---|---|---|---|
| Unresolved product id: SUSE Linux Enterprise Live Patching 15 SP6:kernel-livepatch-6_4_0-150600_23_112-default-4-150600.2.1.ppc64le | — |
Vendor Fix
|
|
| Unresolved product id: SUSE Linux Enterprise Live Patching 15 SP6:kernel-livepatch-6_4_0-150600_23_112-default-4-150600.2.1.s390x | — |
Vendor Fix
|
|
| Unresolved product id: SUSE Linux Enterprise Live Patching 15 SP6:kernel-livepatch-6_4_0-150600_23_112-default-4-150600.2.1.x86_64 | — |
Vendor Fix
|
Threats
Impact
important
References
20 references
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"text": "https://www.suse.com/security/cve/CVE-2026-46113"
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"notes": [
{
"category": "general",
"text": "In the Linux kernel, the following vulnerability has been resolved:\n\nKVM: x86: Fix shadow paging use-after-free due to unexpected GFN\n\nThe shadow MMU computes GFNs for direct shadow pages using sp-\u003egfn plus\nthe SPTE index. This assumption breaks for shadow paging if the guest\npage tables are modified between VM entries (similar to commit\naad885e77496, \"KVM: x86/mmu: Drop/zap existing present SPTE even\nwhen creating an MMIO SPTE\", 2026-03-27). The flow is as follows:\n\n- a PDE is installed for a 2MB mapping, and a page in that area is\n accessed. KVM creates a kvm_mmu_page consisting of 512 4KB pages;\n the kvm_mmu_page is marked by FNAME(fetch) as direct-mapped because\n the guest\u0027s mapping is a huge page (and thus contiguous).\n\n- the PDE mapping is changed from outside the guest.\n\n- the guest accesses another page in the same 2MB area. KVM installs\n a new leaf SPTE and rmap entry; the SPTE uses the \"correct\" GFN\n (i.e. based on the new mapping, as changed in the previous step) but\n that GFN is outside of the [sp-\u003egfn, sp-\u003egfn + 511] range; therefore\n the rmap entry cannot be found and removed when the kvm_mmu_page\n is zapped.\n\n- the memslot that covers the first 2MB mapping is deleted, and the\n kvm_mmu_page for the now-invalid GPA is zapped. However, rmap_remove()\n only looks at the [sp-\u003egfn, sp-\u003egfn + 511] range established in step 1,\n and fails to find the rmap entry that was recorded by step 3.\n\n- any operation that causes an rmap walk for the same page accessed\n by step 3 then walks a stale rmap and dereferences a freed kvm_mmu_page.\n This includes dirty logging or MMU notifier invalidations (e.g., from\n MADV_DONTNEED).\n\nThe underlying issue is that KVM\u0027s walking of shadow PTEs assumes that\nif a SPTE is present when KVM wants to install a non-leaf SPTE, then the\nexisting kvm_mmu_page must be for the correct gfn. Because the only way\nfor the gfn to be wrong is if KVM messed up and failed to zap a SPTE...\nwhich shouldn\u0027t happen, but *actually* only happens in response to a\nguest write.\n\nThat bug dates back literally forever, as even the first version of KVM\nassumes that the GFN matches and walks into the \"wrong\" shadow page.\nHowever, that was only an imprecision until 2032a93d66fa (\"KVM: MMU:\nDon\u0027t allocate gfns page for direct mmu pages\") came along.\n\nFix it by checking for a target gfn mismatch and zapping the existing\nSPTE. That way the old SP and rmap entries are gone, KVM installs\nthe rmap in the right location, and everyone is happy.",
"title": "CVE description"
}
],
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"SUSE Linux Enterprise Live Patching 15 SP6:kernel-livepatch-6_4_0-150600_23_112-default-4-150600.2.1.s390x",
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{
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"summary": "CVE-2026-46113",
"url": "https://www.suse.com/security/cve/CVE-2026-46113"
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{
"category": "external",
"summary": "SUSE Bug 1266969 for CVE-2026-46113",
"url": "https://bugzilla.suse.com/1266969"
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{
"category": "external",
"summary": "SUSE Bug 1266970 for CVE-2026-46113",
"url": "https://bugzilla.suse.com/1266970"
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"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 Enterprise Live Patching 15 SP6:kernel-livepatch-6_4_0-150600_23_112-default-4-150600.2.1.ppc64le",
"SUSE Linux Enterprise Live Patching 15 SP6:kernel-livepatch-6_4_0-150600_23_112-default-4-150600.2.1.s390x",
"SUSE Linux Enterprise Live Patching 15 SP6:kernel-livepatch-6_4_0-150600_23_112-default-4-150600.2.1.x86_64"
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"scores": [
{
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"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": [
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"SUSE Linux Enterprise Live Patching 15 SP6:kernel-livepatch-6_4_0-150600_23_112-default-4-150600.2.1.s390x",
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{
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"date": "2026-07-28T12:06:44Z",
"details": "important"
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"title": "CVE-2026-46113"
},
{
"cve": "CVE-2026-53359",
"ids": [
{
"system_name": "SUSE CVE Page",
"text": "https://www.suse.com/security/cve/CVE-2026-53359"
}
],
"notes": [
{
"category": "general",
"text": "In the Linux kernel, the following vulnerability has been resolved:\n\nKVM: x86: Fix shadow paging use-after-free due to unexpected role\n\nCommit 0cb2af2ea66ad (\"KVM: x86: Fix shadow paging use-after-free due\nto unexpected GFN\") fixed a shadow paging mismatch between stored and\ncomputed GFNs; the bug could be triggered by changing a PDE mapping from\noutside the guest, and then deleting a memslot. The rmap_remove()\ncall would miss entries created after the PDE change because the GFN\nof the leaf SPTE does not match the GFN of the struct kvm_mmu_page.\n\nA similar hole however remains if the modified PDE points to a non-leaf\npage. In this case the gfn can be made to match, but the role does not\nmatch: the original large 2MB page creates a kvm_mmu_page with direct=1,\nwhile the new 4KB needs a kvm_mmu_page with direct=0. However,\nkvm_mmu_get_child_sp() does not compare the role, and therefore reuses\nthe page.\n\nThe next step is installing a leaf (4KB) SPTE on the new path which\nrecords an rmap entry under the gfn resolved by the walk. But when\nthat child is zapped its parent kvm_mmu_page has direct=1 and\nkvm_mmu_page_get_gfn() computes the gfn for the 4KB page as\nsp-\u003egfn + index instead of using sp-\u003eshadowed_translation[] (or sp-\u003egfns[]\nin older kernels). It therefore fails to remove the recorded entry.\n\nWhen the memslot is dropped the shadow page is freed but the rmap\nentry survives, as in the scenario that was already fixed. Code that\nlater walks that gfn (dirty logging, MMU notifier invalidation, and\nso on) dereferences an sptep that lies in the freed page, causing the\nuse-after-free.",
"title": "CVE description"
}
],
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"summary": "CVE-2026-53359",
"url": "https://www.suse.com/security/cve/CVE-2026-53359"
},
{
"category": "external",
"summary": "SUSE Bug 1270059 for CVE-2026-53359",
"url": "https://bugzilla.suse.com/1270059"
},
{
"category": "external",
"summary": "SUSE Bug 1270060 for CVE-2026-53359",
"url": "https://bugzilla.suse.com/1270060"
},
{
"category": "external",
"summary": "SUSE Bug 1271478 for CVE-2026-53359",
"url": "https://bugzilla.suse.com/1271478"
}
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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 Enterprise Live Patching 15 SP6:kernel-livepatch-6_4_0-150600_23_112-default-4-150600.2.1.s390x",
"SUSE Linux Enterprise Live Patching 15 SP6:kernel-livepatch-6_4_0-150600_23_112-default-4-150600.2.1.x86_64"
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"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": [
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"SUSE Linux Enterprise Live Patching 15 SP6:kernel-livepatch-6_4_0-150600_23_112-default-4-150600.2.1.s390x",
"SUSE Linux Enterprise Live Patching 15 SP6:kernel-livepatch-6_4_0-150600_23_112-default-4-150600.2.1.x86_64"
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"threats": [
{
"category": "impact",
"date": "2026-07-28T12:06:44Z",
"details": "important"
}
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"title": "CVE-2026-53359"
},
{
"cve": "CVE-2026-53366",
"ids": [
{
"system_name": "SUSE CVE Page",
"text": "https://www.suse.com/security/cve/CVE-2026-53366"
}
],
"notes": [
{
"category": "general",
"text": "In the Linux kernel, the following vulnerability has been resolved:\n\nipv4: account for fraggap on the paged allocation path\n\nIn __ip_append_data(), when the paged-allocation branch is taken,\nalloclen and pagedlen are computed as\n\n\talloclen = fragheaderlen + transhdrlen;\n\tpagedlen = datalen - transhdrlen;\n\ndatalen already includes fraggap, but the fraggap bytes carried over\nfrom the previous skb are copied into the new skb\u0027s linear area at\noffset transhdrlen by the subsequent skb_copy_and_csum_bits(). The\nlinear area is therefore undersized by fraggap bytes while pagedlen is\noverstated by the same amount.\n\nThe non-paged branch sets alloclen to fraglen, which already accounts\nfor fraggap because datalen does. Bring the paged branch in line by\nadding fraggap to alloclen and subtracting it from pagedlen.\n\nAfter this adjustment, copy no longer collapses to -fraggap on the\npaged path, so remove the stale comment describing that old arithmetic.",
"title": "CVE description"
}
],
"product_status": {
"recommended": [
"SUSE Linux Enterprise Live Patching 15 SP6:kernel-livepatch-6_4_0-150600_23_112-default-4-150600.2.1.ppc64le",
"SUSE Linux Enterprise Live Patching 15 SP6:kernel-livepatch-6_4_0-150600_23_112-default-4-150600.2.1.s390x",
"SUSE Linux Enterprise Live Patching 15 SP6:kernel-livepatch-6_4_0-150600_23_112-default-4-150600.2.1.x86_64"
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"references": [
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"category": "external",
"summary": "CVE-2026-53366",
"url": "https://www.suse.com/security/cve/CVE-2026-53366"
},
{
"category": "external",
"summary": "SUSE Bug 1271366 for CVE-2026-53366",
"url": "https://bugzilla.suse.com/1271366"
},
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"summary": "SUSE Bug 1271370 for CVE-2026-53366",
"url": "https://bugzilla.suse.com/1271370"
}
],
"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 Enterprise Live Patching 15 SP6:kernel-livepatch-6_4_0-150600_23_112-default-4-150600.2.1.ppc64le",
"SUSE Linux Enterprise Live Patching 15 SP6:kernel-livepatch-6_4_0-150600_23_112-default-4-150600.2.1.s390x",
"SUSE Linux Enterprise Live Patching 15 SP6:kernel-livepatch-6_4_0-150600_23_112-default-4-150600.2.1.x86_64"
]
}
],
"scores": [
{
"cvss_v3": {
"baseScore": 8.5,
"baseSeverity": "HIGH",
"vectorString": "CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H",
"version": "3.1"
},
"products": [
"SUSE Linux Enterprise Live Patching 15 SP6:kernel-livepatch-6_4_0-150600_23_112-default-4-150600.2.1.ppc64le",
"SUSE Linux Enterprise Live Patching 15 SP6:kernel-livepatch-6_4_0-150600_23_112-default-4-150600.2.1.s390x",
"SUSE Linux Enterprise Live Patching 15 SP6:kernel-livepatch-6_4_0-150600_23_112-default-4-150600.2.1.x86_64"
]
}
],
"threats": [
{
"category": "impact",
"date": "2026-07-28T12:06:44Z",
"details": "important"
}
],
"title": "CVE-2026-53366"
}
]
}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
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.
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
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