SUSE-SU-2026:1718-1
Vulnerability from csaf_suse - Published: 2026-05-06 12:33 - Updated: 2026-05-06 12:33Summary
Security update for the Linux Kernel (Live Patch 40 for SUSE Linux Enterprise 15 SP4)
Severity
Important
Notes
Title of the patch: Security update for the Linux Kernel (Live Patch 40 for SUSE Linux Enterprise 15 SP4)
Description of the patch:
This update for the SUSE Linux Enterprise kernel 5.14.21-150400.24.164 fixes various security issues
The following security issues were fixed:
- CVE-2025-38375: virtio-net: ensure the received length does not exceed allocated size (bsc#1258073).
- CVE-2025-39977: futex: Prevent use-after-free during requeue-PI (bsc#1252048).
- CVE-2026-23004: dst: fix races in rt6_uncached_list_del() and rt_del_uncached_list() (bsc#1258655).
- CVE-2026-23204: net/sched: cls_u32: use skb_header_pointer_careful() (bsc#1259126).
- CVE-2026-31431: crypto: algif_aead - Revert to operating out-of-place (bsc#1263689).
Patchnames: SUSE-2026-1718,SUSE-SLE-Module-Live-Patching-15-SP4-2026-1718
Terms of use: CSAF 2.0 data is provided by SUSE under the Creative Commons License 4.0 with Attribution (CC-BY-4.0).
Vendor Fix
To install this SUSE Security Update use the SUSE recommended installation methods like YaST online_update or "zypper patch".
Vendor Fix
To install this SUSE Security Update use the SUSE recommended installation methods like YaST online_update or "zypper patch".
Vendor Fix
To install this SUSE Security Update use the SUSE recommended installation methods like YaST online_update or "zypper patch".
Vendor Fix
To install this SUSE Security Update use the SUSE recommended installation methods like YaST online_update or "zypper patch".
7.8 (High)
Vendor Fix
To install this SUSE Security Update use the SUSE recommended installation methods like YaST online_update or "zypper patch".
References
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"text": "In the Linux kernel, the following vulnerability has been resolved:\n\nvirtio-net: ensure the received length does not exceed allocated size\n\nIn xdp_linearize_page, when reading the following buffers from the ring,\nwe forget to check the received length with the true allocate size. This\ncan lead to an out-of-bound read. This commit adds that missing check.",
"title": "CVE description"
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"text": "In the Linux kernel, the following vulnerability has been resolved:\n\nfutex: Prevent use-after-free during requeue-PI\n\nsyzbot managed to trigger the following race:\n\n T1 T2\n\n futex_wait_requeue_pi()\n futex_do_wait()\n schedule()\n futex_requeue()\n futex_proxy_trylock_atomic()\n futex_requeue_pi_prepare()\n requeue_pi_wake_futex()\n futex_requeue_pi_complete()\n /* preempt */\n\n * timeout/ signal wakes T1 *\n\n futex_requeue_pi_wakeup_sync() // Q_REQUEUE_PI_LOCKED\n futex_hash_put()\n // back to userland, on stack futex_q is garbage\n\n /* back */\n wake_up_state(q-\u003etask, TASK_NORMAL);\n\nIn this scenario futex_wait_requeue_pi() is able to leave without using\nfutex_q::lock_ptr for synchronization.\n\nThis can be prevented by reading futex_q::task before updating the\nfutex_q::requeue_state. A reference on the task_struct is not needed\nbecause requeue_pi_wake_futex() is invoked with a spinlock_t held which\nimplies a RCU read section.\n\nEven if T1 terminates immediately after, the task_struct will remain valid\nduring T2\u0027s wake_up_state(). A READ_ONCE on futex_q::task before\nfutex_requeue_pi_complete() is enough because it ensures that the variable\nis read before the state is updated.\n\nRead futex_q::task before updating the requeue state, use it for the\nfollowing wakeup.",
"title": "CVE description"
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"notes": [
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"category": "general",
"text": "In the Linux kernel, the following vulnerability has been resolved:\n\ndst: fix races in rt6_uncached_list_del() and rt_del_uncached_list()\n\nsyzbot was able to crash the kernel in rt6_uncached_list_flush_dev()\nin an interesting way [1]\n\nCrash happens in list_del_init()/INIT_LIST_HEAD() while writing\nlist-\u003eprev, while the prior write on list-\u003enext went well.\n\nstatic inline void INIT_LIST_HEAD(struct list_head *list)\n{\n\tWRITE_ONCE(list-\u003enext, list); // This went well\n\tWRITE_ONCE(list-\u003eprev, list); // Crash, @list has been freed.\n}\n\nIssue here is that rt6_uncached_list_del() did not attempt to lock\nul-\u003elock, as list_empty(\u0026rt-\u003edst.rt_uncached) returned\ntrue because the WRITE_ONCE(list-\u003enext, list) happened on the other CPU.\n\nWe might use list_del_init_careful() and list_empty_careful(),\nor make sure rt6_uncached_list_del() always grabs the spinlock\nwhenever rt-\u003edst.rt_uncached_list has been set.\n\nA similar fix is neeed for IPv4.\n\n[1]\n\n BUG: KASAN: slab-use-after-free in INIT_LIST_HEAD include/linux/list.h:46 [inline]\n BUG: KASAN: slab-use-after-free in list_del_init include/linux/list.h:296 [inline]\n BUG: KASAN: slab-use-after-free in rt6_uncached_list_flush_dev net/ipv6/route.c:191 [inline]\n BUG: KASAN: slab-use-after-free in rt6_disable_ip+0x633/0x730 net/ipv6/route.c:5020\nWrite of size 8 at addr ffff8880294cfa78 by task kworker/u8:14/3450\n\nCPU: 0 UID: 0 PID: 3450 Comm: kworker/u8:14 Tainted: G L syzkaller #0 PREEMPT_{RT,(full)}\nTainted: [L]=SOFTLOCKUP\nHardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025\nWorkqueue: netns cleanup_net\nCall Trace:\n \u003cTASK\u003e\n dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120\n print_address_description mm/kasan/report.c:378 [inline]\n print_report+0xca/0x240 mm/kasan/report.c:482\n kasan_report+0x118/0x150 mm/kasan/report.c:595\n INIT_LIST_HEAD include/linux/list.h:46 [inline]\n list_del_init include/linux/list.h:296 [inline]\n rt6_uncached_list_flush_dev net/ipv6/route.c:191 [inline]\n rt6_disable_ip+0x633/0x730 net/ipv6/route.c:5020\n addrconf_ifdown+0x143/0x18a0 net/ipv6/addrconf.c:3853\n addrconf_notify+0x1bc/0x1050 net/ipv6/addrconf.c:-1\n notifier_call_chain+0x19d/0x3a0 kernel/notifier.c:85\n call_netdevice_notifiers_extack net/core/dev.c:2268 [inline]\n call_netdevice_notifiers net/core/dev.c:2282 [inline]\n netif_close_many+0x29c/0x410 net/core/dev.c:1785\n unregister_netdevice_many_notify+0xb50/0x2330 net/core/dev.c:12353\n ops_exit_rtnl_list net/core/net_namespace.c:187 [inline]\n ops_undo_list+0x3dc/0x990 net/core/net_namespace.c:248\n cleanup_net+0x4de/0x7b0 net/core/net_namespace.c:696\n process_one_work kernel/workqueue.c:3257 [inline]\n process_scheduled_works+0xad1/0x1770 kernel/workqueue.c:3340\n worker_thread+0x8a0/0xda0 kernel/workqueue.c:3421\n kthread+0x711/0x8a0 kernel/kthread.c:463\n ret_from_fork+0x510/0xa50 arch/x86/kernel/process.c:158\n ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:246\n \u003c/TASK\u003e\n\nAllocated by task 803:\n kasan_save_stack mm/kasan/common.c:57 [inline]\n kasan_save_track+0x3e/0x80 mm/kasan/common.c:78\n unpoison_slab_object mm/kasan/common.c:340 [inline]\n __kasan_slab_alloc+0x6c/0x80 mm/kasan/common.c:366\n kasan_slab_alloc include/linux/kasan.h:253 [inline]\n slab_post_alloc_hook mm/slub.c:4953 [inline]\n slab_alloc_node mm/slub.c:5263 [inline]\n kmem_cache_alloc_noprof+0x18d/0x6c0 mm/slub.c:5270\n dst_alloc+0x105/0x170 net/core/dst.c:89\n ip6_dst_alloc net/ipv6/route.c:342 [inline]\n icmp6_dst_alloc+0x75/0x460 net/ipv6/route.c:3333\n mld_sendpack+0x683/0xe60 net/ipv6/mcast.c:1844\n mld_send_cr net/ipv6/mcast.c:2154 [inline]\n mld_ifc_work+0x83e/0xd60 net/ipv6/mcast.c:2693\n process_one_work kernel/workqueue.c:3257 [inline]\n process_scheduled_works+0xad1/0x1770 kernel/workqueue.c:3340\n worker_thread+0x8a0/0xda0 kernel/workqueue.c:3421\n kthread+0x711/0x8a0 kernel/kthread.c:463\n ret_from_fork+0x510/0xa50 arch/x86/kernel/process.c:158\n ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entr\n---truncated---",
"title": "CVE description"
}
],
"product_status": {
"recommended": [
"SUSE Linux Enterprise Live Patching 15 SP4:kernel-livepatch-5_14_21-150400_24_164-default-18-150400.2.1.ppc64le",
"SUSE Linux Enterprise Live Patching 15 SP4:kernel-livepatch-5_14_21-150400_24_164-default-18-150400.2.1.s390x",
"SUSE Linux Enterprise Live Patching 15 SP4:kernel-livepatch-5_14_21-150400_24_164-default-18-150400.2.1.x86_64"
]
},
"references": [
{
"category": "external",
"summary": "CVE-2026-23004",
"url": "https://www.suse.com/security/cve/CVE-2026-23004"
},
{
"category": "external",
"summary": "SUSE Bug 1257231 for CVE-2026-23004",
"url": "https://bugzilla.suse.com/1257231"
},
{
"category": "external",
"summary": "SUSE Bug 1258655 for CVE-2026-23004",
"url": "https://bugzilla.suse.com/1258655"
}
],
"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 SP4:kernel-livepatch-5_14_21-150400_24_164-default-18-150400.2.1.ppc64le",
"SUSE Linux Enterprise Live Patching 15 SP4:kernel-livepatch-5_14_21-150400_24_164-default-18-150400.2.1.s390x",
"SUSE Linux Enterprise Live Patching 15 SP4:kernel-livepatch-5_14_21-150400_24_164-default-18-150400.2.1.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 Enterprise Live Patching 15 SP4:kernel-livepatch-5_14_21-150400_24_164-default-18-150400.2.1.ppc64le",
"SUSE Linux Enterprise Live Patching 15 SP4:kernel-livepatch-5_14_21-150400_24_164-default-18-150400.2.1.s390x",
"SUSE Linux Enterprise Live Patching 15 SP4:kernel-livepatch-5_14_21-150400_24_164-default-18-150400.2.1.x86_64"
]
}
],
"threats": [
{
"category": "impact",
"date": "2026-05-06T12:33:52Z",
"details": "important"
}
],
"title": "CVE-2026-23004"
},
{
"cve": "CVE-2026-23204",
"ids": [
{
"system_name": "SUSE CVE Page",
"text": "https://www.suse.com/security/cve/CVE-2026-23204"
}
],
"notes": [
{
"category": "general",
"text": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet/sched: cls_u32: use skb_header_pointer_careful()\n\nskb_header_pointer() does not fully validate negative @offset values.\n\nUse skb_header_pointer_careful() instead.\n\nGangMin Kim provided a report and a repro fooling u32_classify():\n\nBUG: KASAN: slab-out-of-bounds in u32_classify+0x1180/0x11b0\nnet/sched/cls_u32.c:221",
"title": "CVE description"
}
],
"product_status": {
"recommended": [
"SUSE Linux Enterprise Live Patching 15 SP4:kernel-livepatch-5_14_21-150400_24_164-default-18-150400.2.1.ppc64le",
"SUSE Linux Enterprise Live Patching 15 SP4:kernel-livepatch-5_14_21-150400_24_164-default-18-150400.2.1.s390x",
"SUSE Linux Enterprise Live Patching 15 SP4:kernel-livepatch-5_14_21-150400_24_164-default-18-150400.2.1.x86_64"
]
},
"references": [
{
"category": "external",
"summary": "CVE-2026-23204",
"url": "https://www.suse.com/security/cve/CVE-2026-23204"
},
{
"category": "external",
"summary": "SUSE Bug 1258340 for CVE-2026-23204",
"url": "https://bugzilla.suse.com/1258340"
},
{
"category": "external",
"summary": "SUSE Bug 1259126 for CVE-2026-23204",
"url": "https://bugzilla.suse.com/1259126"
}
],
"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 SP4:kernel-livepatch-5_14_21-150400_24_164-default-18-150400.2.1.ppc64le",
"SUSE Linux Enterprise Live Patching 15 SP4:kernel-livepatch-5_14_21-150400_24_164-default-18-150400.2.1.s390x",
"SUSE Linux Enterprise Live Patching 15 SP4:kernel-livepatch-5_14_21-150400_24_164-default-18-150400.2.1.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 Enterprise Live Patching 15 SP4:kernel-livepatch-5_14_21-150400_24_164-default-18-150400.2.1.ppc64le",
"SUSE Linux Enterprise Live Patching 15 SP4:kernel-livepatch-5_14_21-150400_24_164-default-18-150400.2.1.s390x",
"SUSE Linux Enterprise Live Patching 15 SP4:kernel-livepatch-5_14_21-150400_24_164-default-18-150400.2.1.x86_64"
]
}
],
"threats": [
{
"category": "impact",
"date": "2026-05-06T12:33:52Z",
"details": "important"
}
],
"title": "CVE-2026-23204"
},
{
"cve": "CVE-2026-31431",
"ids": [
{
"system_name": "SUSE CVE Page",
"text": "https://www.suse.com/security/cve/CVE-2026-31431"
}
],
"notes": [
{
"category": "general",
"text": "In the Linux kernel, the following vulnerability has been resolved:\n\ncrypto: algif_aead - Revert to operating out-of-place\n\nThis mostly reverts commit 72548b093ee3 except for the copying of\nthe associated data.\n\nThere is no benefit in operating in-place in algif_aead since the\nsource and destination come from different mappings. Get rid of\nall the complexity added for in-place operation and just copy the\nAD directly.",
"title": "CVE description"
}
],
"product_status": {
"recommended": [
"SUSE Linux Enterprise Live Patching 15 SP4:kernel-livepatch-5_14_21-150400_24_164-default-18-150400.2.1.ppc64le",
"SUSE Linux Enterprise Live Patching 15 SP4:kernel-livepatch-5_14_21-150400_24_164-default-18-150400.2.1.s390x",
"SUSE Linux Enterprise Live Patching 15 SP4:kernel-livepatch-5_14_21-150400_24_164-default-18-150400.2.1.x86_64"
]
},
"references": [
{
"category": "external",
"summary": "CVE-2026-31431",
"url": "https://www.suse.com/security/cve/CVE-2026-31431"
},
{
"category": "external",
"summary": "SUSE Bug 1262573 for CVE-2026-31431",
"url": "https://bugzilla.suse.com/1262573"
},
{
"category": "external",
"summary": "SUSE Bug 1263689 for CVE-2026-31431",
"url": "https://bugzilla.suse.com/1263689"
}
],
"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 SP4:kernel-livepatch-5_14_21-150400_24_164-default-18-150400.2.1.ppc64le",
"SUSE Linux Enterprise Live Patching 15 SP4:kernel-livepatch-5_14_21-150400_24_164-default-18-150400.2.1.s390x",
"SUSE Linux Enterprise Live Patching 15 SP4:kernel-livepatch-5_14_21-150400_24_164-default-18-150400.2.1.x86_64"
]
}
],
"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 Live Patching 15 SP4:kernel-livepatch-5_14_21-150400_24_164-default-18-150400.2.1.ppc64le",
"SUSE Linux Enterprise Live Patching 15 SP4:kernel-livepatch-5_14_21-150400_24_164-default-18-150400.2.1.s390x",
"SUSE Linux Enterprise Live Patching 15 SP4:kernel-livepatch-5_14_21-150400_24_164-default-18-150400.2.1.x86_64"
]
}
],
"threats": [
{
"category": "impact",
"date": "2026-05-06T12:33:52Z",
"details": "important"
}
],
"title": "CVE-2026-31431"
}
]
}
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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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