SUSE-SU-2026:21326-1
Vulnerability from csaf_suse - Published: 2026-04-22 16:54 - Updated: 2026-09-16 19:43Summary
Security update for the Linux Kernel RT (Live Patch 8 for SUSE Linux Enterprise Micro 6.0)
Severity
Important
Notes
Title of the patch: Security update for the Linux Kernel RT (Live Patch 8 for SUSE Linux Enterprise Micro 6.0)
Description of the patch:
This update for the SUSE Linux Enterprise Kernel 6.4.0-31.1 fixes various security issues
The following security issues were fixed:
- CVE-2025-40309: Bluetooth: SCO: Fix UAF on sco_conn_free (bsc#1255066).
- CVE-2026-23268: apparmor: fix unprivileged local user can do privileged policy management (bsc#1259859).
Patchnames: SUSE-SLE-Micro-6.0-kernel-347
Terms of use: CSAF 2.0 data is provided by SUSE under the Creative Commons License 4.0 with Attribution (CC-BY-4.0).
Affected products
Recommended
1 product
| Product | Identifier | Version | Remediation |
|---|---|---|---|
| Unresolved product id: SUSE Linux Micro 6.0:kernel-livepatch-6_4_0-31-rt-15-1.2.x86_64 | — |
Vendor Fix
|
Threats
Impact
important
Affected products
Recommended
1 product, the same list as for
CVE-2025-40309
Threats
Impact
important
References
14 references
{
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"text": "\nThis update for the SUSE Linux Enterprise Kernel 6.4.0-31.1 fixes various security issues\n\nThe following security issues were fixed:\n\n- CVE-2025-40309: Bluetooth: SCO: Fix UAF on sco_conn_free (bsc#1255066).\n- CVE-2026-23268: apparmor: fix unprivileged local user can do privileged policy management (bsc#1259859).\n",
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"url": "https://ftp.suse.com/pub/projects/security/csaf/suse-su-2026_21326-1.json"
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"url": "https://www.suse.com/support/update/announcement/2026/suse-su-202621326-1/"
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{
"category": "self",
"summary": "E-Mail link for SUSE-SU-2026:21326-1",
"url": "https://lists.suse.com/pipermail/sle-updates/2026-April/045991.html"
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{
"category": "self",
"summary": "SUSE Bug 1255066",
"url": "https://bugzilla.suse.com/1255066"
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{
"category": "self",
"summary": "SUSE Bug 1259859",
"url": "https://bugzilla.suse.com/1259859"
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{
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"summary": "SUSE CVE CVE-2025-40309 page",
"url": "https://www.suse.com/security/cve/CVE-2025-40309/"
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{
"category": "self",
"summary": "SUSE CVE CVE-2026-23268 page",
"url": "https://www.suse.com/security/cve/CVE-2026-23268/"
}
],
"title": "Security update for the Linux Kernel RT (Live Patch 8 for SUSE Linux Enterprise Micro 6.0)",
"tracking": {
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"date": "2026-04-22T16:54:00Z",
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"id": "SUSE-SU-2026:21326-1",
"initial_release_date": "2026-04-22T16:54:00Z",
"revision_history": [
{
"date": "2026-04-22T16:54:00Z",
"number": "1",
"summary": "Current version"
},
{
"date": "2026-09-16T18:53:50Z",
"number": "2",
"summary": "unknown changes"
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{
"date": "2026-09-16T19:43:19Z",
"number": "3",
"summary": "unknown changes"
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],
"status": "final",
"version": "3"
}
},
"product_tree": {
"branches": [
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{
"branches": [
{
"category": "product_version",
"name": "kernel-livepatch-6_4_0-31-rt-15-1.2.x86_64",
"product": {
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"product_id": "kernel-livepatch-6_4_0-31-rt-15-1.2.x86_64",
"product_identification_helper": {
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}
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],
"category": "architecture",
"name": "x86_64"
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{
"branches": [
{
"category": "product_name",
"name": "SUSE Linux Micro 6.0",
"product": {
"name": "SUSE Linux Micro 6.0",
"product_id": "SUSE Linux Micro 6.0",
"product_identification_helper": {
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"relationships": [
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"relates_to_product_reference": "SUSE Linux Micro 6.0"
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"vulnerabilities": [
{
"cve": "CVE-2025-40309",
"ids": [
{
"system_name": "SUSE CVE Page",
"text": "https://www.suse.com/security/cve/CVE-2025-40309"
}
],
"notes": [
{
"category": "general",
"text": "In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: SCO: Fix UAF on sco_conn_free\n\nBUG: KASAN: slab-use-after-free in sco_conn_free net/bluetooth/sco.c:87 [inline]\nBUG: KASAN: slab-use-after-free in kref_put include/linux/kref.h:65 [inline]\nBUG: KASAN: slab-use-after-free in sco_conn_put+0xdd/0x410\nnet/bluetooth/sco.c:107\nWrite of size 8 at addr ffff88811cb96b50 by task kworker/u17:4/352\n\nCPU: 1 UID: 0 PID: 352 Comm: kworker/u17:4 Not tainted\n6.17.0-rc5-g717368f83676 #4 PREEMPT(voluntary)\nHardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.15.0-1 04/01/2014\nWorkqueue: hci13 hci_cmd_sync_work\nCall Trace:\n \u003cTASK\u003e\n __dump_stack lib/dump_stack.c:94 [inline]\n dump_stack_lvl+0x10b/0x170 lib/dump_stack.c:120\n print_address_description mm/kasan/report.c:378 [inline]\n print_report+0x191/0x550 mm/kasan/report.c:482\n kasan_report+0xc4/0x100 mm/kasan/report.c:595\n sco_conn_free net/bluetooth/sco.c:87 [inline]\n kref_put include/linux/kref.h:65 [inline]\n sco_conn_put+0xdd/0x410 net/bluetooth/sco.c:107\n sco_connect_cfm+0xb4/0xae0 net/bluetooth/sco.c:1441\n hci_connect_cfm include/net/bluetooth/hci_core.h:2082 [inline]\n hci_conn_failed+0x20a/0x2e0 net/bluetooth/hci_conn.c:1313\n hci_conn_unlink+0x55f/0x810 net/bluetooth/hci_conn.c:1121\n hci_conn_del+0xb6/0x1110 net/bluetooth/hci_conn.c:1147\n hci_abort_conn_sync+0x8c5/0xbb0 net/bluetooth/hci_sync.c:5689\n hci_cmd_sync_work+0x281/0x380 net/bluetooth/hci_sync.c:332\n process_one_work kernel/workqueue.c:3236 [inline]\n process_scheduled_works+0x77e/0x1040 kernel/workqueue.c:3319\n worker_thread+0xbee/0x1200 kernel/workqueue.c:3400\n kthread+0x3c7/0x870 kernel/kthread.c:463\n ret_from_fork+0x13a/0x1e0 arch/x86/kernel/process.c:148\n ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245\n \u003c/TASK\u003e\n\nAllocated by task 31370:\n kasan_save_stack mm/kasan/common.c:47 [inline]\n kasan_save_track+0x30/0x70 mm/kasan/common.c:68\n poison_kmalloc_redzone mm/kasan/common.c:388 [inline]\n __kasan_kmalloc+0x82/0x90 mm/kasan/common.c:405\n kasan_kmalloc include/linux/kasan.h:260 [inline]\n __do_kmalloc_node mm/slub.c:4382 [inline]\n __kmalloc_noprof+0x22f/0x390 mm/slub.c:4394\n kmalloc_noprof include/linux/slab.h:909 [inline]\n sk_prot_alloc+0xae/0x220 net/core/sock.c:2239\n sk_alloc+0x34/0x5a0 net/core/sock.c:2295\n bt_sock_alloc+0x3c/0x330 net/bluetooth/af_bluetooth.c:151\n sco_sock_alloc net/bluetooth/sco.c:562 [inline]\n sco_sock_create+0xc0/0x350 net/bluetooth/sco.c:593\n bt_sock_create+0x161/0x3b0 net/bluetooth/af_bluetooth.c:135\n __sock_create+0x3ad/0x780 net/socket.c:1589\n sock_create net/socket.c:1647 [inline]\n __sys_socket_create net/socket.c:1684 [inline]\n __sys_socket+0xd5/0x330 net/socket.c:1731\n __do_sys_socket net/socket.c:1745 [inline]\n __se_sys_socket net/socket.c:1743 [inline]\n __x64_sys_socket+0x7a/0x90 net/socket.c:1743\n do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]\n do_syscall_64+0xc7/0x240 arch/x86/entry/syscall_64.c:94\n entry_SYSCALL_64_after_hwframe+0x77/0x7f\n\nFreed by task 31374:\n kasan_save_stack mm/kasan/common.c:47 [inline]\n kasan_save_track+0x30/0x70 mm/kasan/common.c:68\n kasan_save_free_info+0x40/0x50 mm/kasan/generic.c:576\n poison_slab_object mm/kasan/common.c:243 [inline]\n __kasan_slab_free+0x3d/0x50 mm/kasan/common.c:275\n kasan_slab_free include/linux/kasan.h:233 [inline]\n slab_free_hook mm/slub.c:2428 [inline]\n slab_free mm/slub.c:4701 [inline]\n kfree+0x199/0x3b0 mm/slub.c:4900\n sk_prot_free net/core/sock.c:2278 [inline]\n __sk_destruct+0x4aa/0x630 net/core/sock.c:2373\n sco_sock_release+0x2ad/0x300 net/bluetooth/sco.c:1333\n __sock_release net/socket.c:649 [inline]\n sock_close+0xb8/0x230 net/socket.c:1439\n __fput+0x3d1/0x9e0 fs/file_table.c:468\n task_work_run+0x206/0x2a0 kernel/task_work.c:227\n get_signal+0x1201/0x1410 kernel/signal.c:2807\n arch_do_signal_or_restart+0x34/0x740 arch/x86/kernel/signal.c:337\n exit_to_user_mode_loop+0x68/0xc0 kernel/entry/common.c:40\n exit_to_user_mode_prepare include/linux/irq-entry-common.h:225 [inline]\n s\n---truncated---",
"title": "CVE description"
}
],
"product_status": {
"recommended": [
"SUSE Linux Micro 6.0:kernel-livepatch-6_4_0-31-rt-15-1.2.x86_64"
]
},
"references": [
{
"category": "external",
"summary": "CVE-2025-40309",
"url": "https://www.suse.com/security/cve/CVE-2025-40309"
},
{
"category": "external",
"summary": "SUSE Bug 1255065 for CVE-2025-40309",
"url": "https://bugzilla.suse.com/1255065"
},
{
"category": "external",
"summary": "SUSE Bug 1255066 for CVE-2025-40309",
"url": "https://bugzilla.suse.com/1255066"
}
],
"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-livepatch-6_4_0-31-rt-15-1.2.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 6.0:kernel-livepatch-6_4_0-31-rt-15-1.2.x86_64"
]
}
],
"threats": [
{
"category": "impact",
"date": "2026-04-22T16:54:00Z",
"details": "important"
}
],
"title": "CVE-2025-40309"
},
{
"cve": "CVE-2026-23268",
"ids": [
{
"system_name": "SUSE CVE Page",
"text": "https://www.suse.com/security/cve/CVE-2026-23268"
}
],
"notes": [
{
"category": "general",
"text": "In the Linux kernel, the following vulnerability has been resolved:\n\napparmor: fix unprivileged local user can do privileged policy management\n\nAn unprivileged local user can load, replace, and remove profiles by\nopening the apparmorfs interfaces, via a confused deputy attack, by\npassing the opened fd to a privileged process, and getting the\nprivileged process to write to the interface.\n\nThis does require a privileged target that can be manipulated to do\nthe write for the unprivileged process, but once such access is\nachieved full policy management is possible and all the possible\nimplications that implies: removing confinement, DoS of system or\ntarget applications by denying all execution, by-passing the\nunprivileged user namespace restriction, to exploiting kernel bugs for\na local privilege escalation.\n\nThe policy management interface can not have its permissions simply\nchanged from 0666 to 0600 because non-root processes need to be able\nto load policy to different policy namespaces.\n\nInstead ensure the task writing the interface has privileges that\nare a subset of the task that opened the interface. This is already\ndone via policy for confined processes, but unconfined can delegate\naccess to the opened fd, by-passing the usual policy check.",
"title": "CVE description"
}
],
"product_status": {
"recommended": [
"SUSE Linux Micro 6.0:kernel-livepatch-6_4_0-31-rt-15-1.2.x86_64"
]
},
"references": [
{
"category": "external",
"summary": "CVE-2026-23268",
"url": "https://www.suse.com/security/cve/CVE-2026-23268"
},
{
"category": "external",
"summary": "SUSE Bug 1258850 for CVE-2026-23268",
"url": "https://bugzilla.suse.com/1258850"
},
{
"category": "external",
"summary": "SUSE Bug 1259859 for CVE-2026-23268",
"url": "https://bugzilla.suse.com/1259859"
}
],
"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-livepatch-6_4_0-31-rt-15-1.2.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 6.0:kernel-livepatch-6_4_0-31-rt-15-1.2.x86_64"
]
}
],
"threats": [
{
"category": "impact",
"date": "2026-04-22T16:54:00Z",
"details": "important"
}
],
"title": "CVE-2026-23268"
}
]
}
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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.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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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.
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