SUSE-SU-2026:1900-1
Vulnerability from csaf_suse - Published: 2026-05-17 13:22 - Updated: 2026-05-17 13:22Summary
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 15 SP4 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-2026-43284: xfrm: esp: avoid in-place decrypt on shared skb frags (bsc#1264449).
- CVE-2026-43500: rxrpc: Also unshare DATA/RESPONSE packets when paged frags are present (aka Dirty Frag) (bsc#1264450)
- CVE-2026-46333: ptrace: Logic bug in the Linux kernel's __ptrace_may_access() function (bsc#1265308).
The following non security issues were fixed:
- io-wq: check that the predecessor is hashed in io_wq_remove_pending() (git-fixes).
Patchnames: SUSE-2026-1900,SUSE-SLE-Micro-5.3-2026-1900,SUSE-SLE-Micro-5.4-2026-1900
Terms of use: CSAF 2.0 data is provided by SUSE under the Creative Commons License 4.0 with Attribution (CC-BY-4.0).
7.4 (High)
Affected products
Recommended
4 products
| Product | Identifier | Version | Remediation |
|---|---|---|---|
| Unresolved product id: SUSE Linux Enterprise Micro 5.3:kernel-rt-5.14.21-150400.15.164.1.x86_64 | — |
Vendor Fix
|
|
| Unresolved product id: SUSE Linux Enterprise Micro 5.3:kernel-source-rt-5.14.21-150400.15.164.1.noarch | — |
Vendor Fix
|
|
| Unresolved product id: SUSE Linux Enterprise Micro 5.4:kernel-rt-5.14.21-150400.15.164.1.x86_64 | — |
Vendor Fix
|
|
| Unresolved product id: SUSE Linux Enterprise Micro 5.4:kernel-source-rt-5.14.21-150400.15.164.1.noarch | — |
Vendor Fix
|
Threats
Impact
important
8.8 (High)
Affected products
Recommended
4 products
| Product | Identifier | Version | Remediation |
|---|---|---|---|
| Unresolved product id: SUSE Linux Enterprise Micro 5.3:kernel-rt-5.14.21-150400.15.164.1.x86_64 | — |
Vendor Fix
|
|
| Unresolved product id: SUSE Linux Enterprise Micro 5.3:kernel-source-rt-5.14.21-150400.15.164.1.noarch | — |
Vendor Fix
|
|
| Unresolved product id: SUSE Linux Enterprise Micro 5.4:kernel-rt-5.14.21-150400.15.164.1.x86_64 | — |
Vendor Fix
|
|
| Unresolved product id: SUSE Linux Enterprise Micro 5.4:kernel-source-rt-5.14.21-150400.15.164.1.noarch | — |
Vendor Fix
|
Threats
Impact
important
8.8 (High)
Affected products
Recommended
4 products
| Product | Identifier | Version | Remediation |
|---|---|---|---|
| Unresolved product id: SUSE Linux Enterprise Micro 5.3:kernel-rt-5.14.21-150400.15.164.1.x86_64 | — |
Vendor Fix
|
|
| Unresolved product id: SUSE Linux Enterprise Micro 5.3:kernel-source-rt-5.14.21-150400.15.164.1.noarch | — |
Vendor Fix
|
|
| Unresolved product id: SUSE Linux Enterprise Micro 5.4:kernel-rt-5.14.21-150400.15.164.1.x86_64 | — |
Vendor Fix
|
|
| Unresolved product id: SUSE Linux Enterprise Micro 5.4:kernel-source-rt-5.14.21-150400.15.164.1.noarch | — |
Vendor Fix
|
Threats
Impact
important
8.8 (High)
Affected products
Recommended
4 products
| Product | Identifier | Version | Remediation |
|---|---|---|---|
| Unresolved product id: SUSE Linux Enterprise Micro 5.3:kernel-rt-5.14.21-150400.15.164.1.x86_64 | — |
Vendor Fix
|
|
| Unresolved product id: SUSE Linux Enterprise Micro 5.3:kernel-source-rt-5.14.21-150400.15.164.1.noarch | — |
Vendor Fix
|
|
| Unresolved product id: SUSE Linux Enterprise Micro 5.4:kernel-rt-5.14.21-150400.15.164.1.x86_64 | — |
Vendor Fix
|
|
| Unresolved product id: SUSE Linux Enterprise Micro 5.4:kernel-source-rt-5.14.21-150400.15.164.1.noarch | — |
Vendor Fix
|
Threats
Impact
important
7.8 (High)
Affected products
Recommended
4 products
| Product | Identifier | Version | Remediation |
|---|---|---|---|
| Unresolved product id: SUSE Linux Enterprise Micro 5.3:kernel-rt-5.14.21-150400.15.164.1.x86_64 | — |
Vendor Fix
|
|
| Unresolved product id: SUSE Linux Enterprise Micro 5.3:kernel-source-rt-5.14.21-150400.15.164.1.noarch | — |
Vendor Fix
|
|
| Unresolved product id: SUSE Linux Enterprise Micro 5.4:kernel-rt-5.14.21-150400.15.164.1.x86_64 | — |
Vendor Fix
|
|
| Unresolved product id: SUSE Linux Enterprise Micro 5.4:kernel-source-rt-5.14.21-150400.15.164.1.noarch | — |
Vendor Fix
|
Threats
Impact
important
References
34 references
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"vulnerabilities": [
{
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"ids": [
{
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"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": {
"recommended": [
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},
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{
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{
"category": "external",
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"url": "https://bugzilla.suse.com/1264066"
},
{
"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 Enterprise Micro 5.3:kernel-rt-5.14.21-150400.15.164.1.x86_64",
"SUSE Linux Enterprise Micro 5.3:kernel-source-rt-5.14.21-150400.15.164.1.noarch",
"SUSE Linux Enterprise Micro 5.4:kernel-rt-5.14.21-150400.15.164.1.x86_64",
"SUSE Linux Enterprise Micro 5.4:kernel-source-rt-5.14.21-150400.15.164.1.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": [
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}
],
"threats": [
{
"category": "impact",
"date": "2026-05-17T13:22:30Z",
"details": "important"
}
],
"title": "CVE-2025-54518"
},
{
"cve": "CVE-2026-43284",
"ids": [
{
"system_name": "SUSE CVE Page",
"text": "https://www.suse.com/security/cve/CVE-2026-43284"
}
],
"notes": [
{
"category": "general",
"text": "In the Linux kernel, the following vulnerability has been resolved:\n\nxfrm: esp: avoid in-place decrypt on shared skb frags\n\nMSG_SPLICE_PAGES can attach pages from a pipe directly to an skb. TCP\nmarks such skbs with SKBFL_SHARED_FRAG after skb_splice_from_iter(),\nso later paths that may modify packet data can first make a private\ncopy. The IPv4/IPv6 datagram append paths did not set this flag when\nsplicing pages into UDP skbs.\n\nThat leaves an ESP-in-UDP packet made from shared pipe pages looking\nlike an ordinary uncloned nonlinear skb. ESP input then takes the no-COW\nfast path for uncloned skbs without a frag_list and decrypts in place\nover data that is not owned privately by the skb.\n\nMark IPv4/IPv6 datagram splice frags with SKBFL_SHARED_FRAG, matching\nTCP. Also make ESP input fall back to skb_cow_data() when the flag is\npresent, so ESP does not decrypt externally backed frags in place.\nPrivate nonlinear skb frags still use the existing fast path.\n\nThis intentionally does not change ESP output. In esp_output_head(),\nthe path that appends the ESP trailer to existing skb tailroom without\ncalling skb_cow_data() is not reachable for nonlinear skbs:\nskb_tailroom() returns zero when skb-\u003edata_len is nonzero, while ESP\ntailen is positive. Thus ESP output will either use the separate\ndestination-frag path or fall back to skb_cow_data().",
"title": "CVE description"
}
],
"product_status": {
"recommended": [
"SUSE Linux Enterprise Micro 5.3:kernel-rt-5.14.21-150400.15.164.1.x86_64",
"SUSE Linux Enterprise Micro 5.3:kernel-source-rt-5.14.21-150400.15.164.1.noarch",
"SUSE Linux Enterprise Micro 5.4:kernel-rt-5.14.21-150400.15.164.1.x86_64",
"SUSE Linux Enterprise Micro 5.4:kernel-source-rt-5.14.21-150400.15.164.1.noarch"
]
},
"references": [
{
"category": "external",
"summary": "CVE-2026-43284",
"url": "https://www.suse.com/security/cve/CVE-2026-43284"
},
{
"category": "external",
"summary": "SUSE Bug 1264449 for CVE-2026-43284",
"url": "https://bugzilla.suse.com/1264449"
},
{
"category": "external",
"summary": "SUSE Bug 1264459 for CVE-2026-43284",
"url": "https://bugzilla.suse.com/1264459"
},
{
"category": "external",
"summary": "SUSE Bug 1265383 for CVE-2026-43284",
"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 Enterprise Micro 5.3:kernel-rt-5.14.21-150400.15.164.1.x86_64",
"SUSE Linux Enterprise Micro 5.3:kernel-source-rt-5.14.21-150400.15.164.1.noarch",
"SUSE Linux Enterprise Micro 5.4:kernel-rt-5.14.21-150400.15.164.1.x86_64",
"SUSE Linux Enterprise Micro 5.4:kernel-source-rt-5.14.21-150400.15.164.1.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 Enterprise Micro 5.3:kernel-rt-5.14.21-150400.15.164.1.x86_64",
"SUSE Linux Enterprise Micro 5.3:kernel-source-rt-5.14.21-150400.15.164.1.noarch",
"SUSE Linux Enterprise Micro 5.4:kernel-rt-5.14.21-150400.15.164.1.x86_64",
"SUSE Linux Enterprise Micro 5.4:kernel-source-rt-5.14.21-150400.15.164.1.noarch"
]
}
],
"threats": [
{
"category": "impact",
"date": "2026-05-17T13:22:30Z",
"details": "important"
}
],
"title": "CVE-2026-43284"
},
{
"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"
}
],
"product_status": {
"recommended": [
"SUSE Linux Enterprise Micro 5.3:kernel-rt-5.14.21-150400.15.164.1.x86_64",
"SUSE Linux Enterprise Micro 5.3:kernel-source-rt-5.14.21-150400.15.164.1.noarch",
"SUSE Linux Enterprise Micro 5.4:kernel-rt-5.14.21-150400.15.164.1.x86_64",
"SUSE Linux Enterprise Micro 5.4:kernel-source-rt-5.14.21-150400.15.164.1.noarch"
]
},
"references": [
{
"category": "external",
"summary": "CVE-2026-43500",
"url": "https://www.suse.com/security/cve/CVE-2026-43500"
},
{
"category": "external",
"summary": "SUSE Bug 1264450 for CVE-2026-43500",
"url": "https://bugzilla.suse.com/1264450"
},
{
"category": "external",
"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"
}
],
"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 Micro 5.3:kernel-rt-5.14.21-150400.15.164.1.x86_64",
"SUSE Linux Enterprise Micro 5.3:kernel-source-rt-5.14.21-150400.15.164.1.noarch",
"SUSE Linux Enterprise Micro 5.4:kernel-rt-5.14.21-150400.15.164.1.x86_64",
"SUSE Linux Enterprise Micro 5.4:kernel-source-rt-5.14.21-150400.15.164.1.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 Enterprise Micro 5.3:kernel-rt-5.14.21-150400.15.164.1.x86_64",
"SUSE Linux Enterprise Micro 5.3:kernel-source-rt-5.14.21-150400.15.164.1.noarch",
"SUSE Linux Enterprise Micro 5.4:kernel-rt-5.14.21-150400.15.164.1.x86_64",
"SUSE Linux Enterprise Micro 5.4:kernel-source-rt-5.14.21-150400.15.164.1.noarch"
]
}
],
"threats": [
{
"category": "impact",
"date": "2026-05-17T13:22:30Z",
"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": {
"recommended": [
"SUSE Linux Enterprise Micro 5.3:kernel-rt-5.14.21-150400.15.164.1.x86_64",
"SUSE Linux Enterprise Micro 5.3:kernel-source-rt-5.14.21-150400.15.164.1.noarch",
"SUSE Linux Enterprise Micro 5.4:kernel-rt-5.14.21-150400.15.164.1.x86_64",
"SUSE Linux Enterprise Micro 5.4:kernel-source-rt-5.14.21-150400.15.164.1.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 Enterprise Micro 5.3:kernel-rt-5.14.21-150400.15.164.1.x86_64",
"SUSE Linux Enterprise Micro 5.3:kernel-source-rt-5.14.21-150400.15.164.1.noarch",
"SUSE Linux Enterprise Micro 5.4:kernel-rt-5.14.21-150400.15.164.1.x86_64",
"SUSE Linux Enterprise Micro 5.4:kernel-source-rt-5.14.21-150400.15.164.1.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 Enterprise Micro 5.3:kernel-rt-5.14.21-150400.15.164.1.x86_64",
"SUSE Linux Enterprise Micro 5.3:kernel-source-rt-5.14.21-150400.15.164.1.noarch",
"SUSE Linux Enterprise Micro 5.4:kernel-rt-5.14.21-150400.15.164.1.x86_64",
"SUSE Linux Enterprise Micro 5.4:kernel-source-rt-5.14.21-150400.15.164.1.noarch"
]
}
],
"threats": [
{
"category": "impact",
"date": "2026-05-17T13:22:30Z",
"details": "important"
}
],
"title": "CVE-2026-46300"
},
{
"cve": "CVE-2026-46333",
"ids": [
{
"system_name": "SUSE CVE Page",
"text": "https://www.suse.com/security/cve/CVE-2026-46333"
}
],
"notes": [
{
"category": "general",
"text": "In the Linux kernel, the following vulnerability has been resolved:\n\nptrace: slightly saner \u0027get_dumpable()\u0027 logic\n\nThe \u0027dumpability\u0027 of a task is fundamentally about the memory image of\nthe task - the concept comes from whether it can core dump or not - and\nmakes no sense when you don\u0027t have an associated mm.\n\nAnd almost all users do in fact use it only for the case where the task\nhas a mm pointer.\n\nBut we have one odd special case: ptrace_may_access() uses \u0027dumpable\u0027 to\ncheck various other things entirely independently of the MM (typically\nexplicitly using flags like PTRACE_MODE_READ_FSCREDS). Including for\nthreads that no longer have a VM (and maybe never did, like most kernel\nthreads).\n\nIt\u0027s not what this flag was designed for, but it is what it is.\n\nThe ptrace code does check that the uid/gid matches, so you do have to\nbe uid-0 to see kernel thread details, but this means that the\ntraditional \"drop capabilities\" model doesn\u0027t make any difference for\nthis all.\n\nMake it all make a *bit* more sense by saying that if you don\u0027t have a\nMM pointer, we\u0027ll use a cached \"last dumpability\" flag if the thread\never had a MM (it will be zero for kernel threads since it is never\nset), and require a proper CAP_SYS_PTRACE capability to override.",
"title": "CVE description"
}
],
"product_status": {
"recommended": [
"SUSE Linux Enterprise Micro 5.3:kernel-rt-5.14.21-150400.15.164.1.x86_64",
"SUSE Linux Enterprise Micro 5.3:kernel-source-rt-5.14.21-150400.15.164.1.noarch",
"SUSE Linux Enterprise Micro 5.4:kernel-rt-5.14.21-150400.15.164.1.x86_64",
"SUSE Linux Enterprise Micro 5.4:kernel-source-rt-5.14.21-150400.15.164.1.noarch"
]
},
"references": [
{
"category": "external",
"summary": "CVE-2026-46333",
"url": "https://www.suse.com/security/cve/CVE-2026-46333"
},
{
"category": "external",
"summary": "SUSE Bug 1265308 for CVE-2026-46333",
"url": "https://bugzilla.suse.com/1265308"
},
{
"category": "external",
"summary": "SUSE Bug 1265384 for CVE-2026-46333",
"url": "https://bugzilla.suse.com/1265384"
}
],
"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 Micro 5.3:kernel-rt-5.14.21-150400.15.164.1.x86_64",
"SUSE Linux Enterprise Micro 5.3:kernel-source-rt-5.14.21-150400.15.164.1.noarch",
"SUSE Linux Enterprise Micro 5.4:kernel-rt-5.14.21-150400.15.164.1.x86_64",
"SUSE Linux Enterprise Micro 5.4:kernel-source-rt-5.14.21-150400.15.164.1.noarch"
]
}
],
"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 Enterprise Micro 5.3:kernel-rt-5.14.21-150400.15.164.1.x86_64",
"SUSE Linux Enterprise Micro 5.3:kernel-source-rt-5.14.21-150400.15.164.1.noarch",
"SUSE Linux Enterprise Micro 5.4:kernel-rt-5.14.21-150400.15.164.1.x86_64",
"SUSE Linux Enterprise Micro 5.4:kernel-source-rt-5.14.21-150400.15.164.1.noarch"
]
}
],
"threats": [
{
"category": "impact",
"date": "2026-05-17T13:22:30Z",
"details": "important"
}
],
"title": "CVE-2026-46333"
}
]
}
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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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