rhsa-2025:15656
Vulnerability from csaf_redhat
Published
2025-09-10 18:25
Modified
2025-09-17 07:28
Summary
Red Hat Security Advisory: kernel security update
Notes
Topic
An update for kernel is now available for Red Hat Enterprise Linux 8.2 Advanced Update Support.
Red Hat Product Security has rated this update as having a security impact of Important. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.
Details
The kernel packages contain the Linux kernel, the core of any Linux operating system.
Security Fix(es):
* kernel: ext4: use-after-free in ext4_xattr_set_entry() (CVE-2023-2513)
* kernel: ipv6: mcast: extend RCU protection in igmp6_send() (CVE-2025-21759)
* kernel: udp: Fix memory accounting leak. (CVE-2025-22058)
* kernel: md-raid10: fix KASAN warning (CVE-2022-50211)
* kernel: posix-cpu-timers: fix race between handle_posix_cpu_timers() and posix_cpu_timer_del() (CVE-2025-38352)
* kernel: tipc: Fix use-after-free in tipc_conn_close() (CVE-2025-38464)
For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.
Terms of Use
This content is licensed under the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0/). If you distribute this content, or a modified version of it, you must provide attribution to Red Hat Inc. and provide a link to the original.
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"category": "description",
"text": "In the Linux kernel, the following vulnerability has been resolved:\n\nmd-raid10: fix KASAN warning\n\nThere\u0027s a KASAN warning in raid10_remove_disk when running the lvm\ntest lvconvert-raid-reshape.sh. We fix this warning by verifying that the\nvalue \"number\" is valid.\n\nBUG: KASAN: slab-out-of-bounds in raid10_remove_disk+0x61/0x2a0 [raid10]\nRead of size 8 at addr ffff889108f3d300 by task mdX_raid10/124682\n\nCPU: 3 PID: 124682 Comm: mdX_raid10 Not tainted 5.19.0-rc6 #1\nHardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.14.0-2 04/01/2014\nCall Trace:\n \u003cTASK\u003e\n dump_stack_lvl+0x34/0x44\n print_report.cold+0x45/0x57a\n ? __lock_text_start+0x18/0x18\n ? raid10_remove_disk+0x61/0x2a0 [raid10]\n kasan_report+0xa8/0xe0\n ? raid10_remove_disk+0x61/0x2a0 [raid10]\n raid10_remove_disk+0x61/0x2a0 [raid10]\nBuffer I/O error on dev dm-76, logical block 15344, async page read\n ? __mutex_unlock_slowpath.constprop.0+0x1e0/0x1e0\n remove_and_add_spares+0x367/0x8a0 [md_mod]\n ? super_written+0x1c0/0x1c0 [md_mod]\n ? mutex_trylock+0xac/0x120\n ? _raw_spin_lock+0x72/0xc0\n ? _raw_spin_lock_bh+0xc0/0xc0\n md_check_recovery+0x848/0x960 [md_mod]\n raid10d+0xcf/0x3360 [raid10]\n ? sched_clock_cpu+0x185/0x1a0\n ? rb_erase+0x4d4/0x620\n ? var_wake_function+0xe0/0xe0\n ? psi_group_change+0x411/0x500\n ? preempt_count_sub+0xf/0xc0\n ? _raw_spin_lock_irqsave+0x78/0xc0\n ? __lock_text_start+0x18/0x18\n ? raid10_sync_request+0x36c0/0x36c0 [raid10]\n ? preempt_count_sub+0xf/0xc0\n ? _raw_spin_unlock_irqrestore+0x19/0x40\n ? del_timer_sync+0xa9/0x100\n ? try_to_del_timer_sync+0xc0/0xc0\n ? _raw_spin_lock_irqsave+0x78/0xc0\n ? __lock_text_start+0x18/0x18\n ? _raw_spin_unlock_irq+0x11/0x24\n ? __list_del_entry_valid+0x68/0xa0\n ? finish_wait+0xa3/0x100\n md_thread+0x161/0x260 [md_mod]\n ? unregister_md_personality+0xa0/0xa0 [md_mod]\n ? _raw_spin_lock_irqsave+0x78/0xc0\n ? prepare_to_wait_event+0x2c0/0x2c0\n ? unregister_md_personality+0xa0/0xa0 [md_mod]\n kthread+0x148/0x180\n ? kthread_complete_and_exit+0x20/0x20\n ret_from_fork+0x1f/0x30\n \u003c/TASK\u003e\n\nAllocated by task 124495:\n kasan_save_stack+0x1e/0x40\n __kasan_kmalloc+0x80/0xa0\n setup_conf+0x140/0x5c0 [raid10]\n raid10_run+0x4cd/0x740 [raid10]\n md_run+0x6f9/0x1300 [md_mod]\n raid_ctr+0x2531/0x4ac0 [dm_raid]\n dm_table_add_target+0x2b0/0x620 [dm_mod]\n table_load+0x1c8/0x400 [dm_mod]\n ctl_ioctl+0x29e/0x560 [dm_mod]\n dm_compat_ctl_ioctl+0x7/0x20 [dm_mod]\n __do_compat_sys_ioctl+0xfa/0x160\n do_syscall_64+0x90/0xc0\n entry_SYSCALL_64_after_hwframe+0x46/0xb0\n\nLast potentially related work creation:\n kasan_save_stack+0x1e/0x40\n __kasan_record_aux_stack+0x9e/0xc0\n kvfree_call_rcu+0x84/0x480\n timerfd_release+0x82/0x140\nL __fput+0xfa/0x400\n task_work_run+0x80/0xc0\n exit_to_user_mode_prepare+0x155/0x160\n syscall_exit_to_user_mode+0x12/0x40\n do_syscall_64+0x42/0xc0\n entry_SYSCALL_64_after_hwframe+0x46/0xb0\n\nSecond to last potentially related work creation:\n kasan_save_stack+0x1e/0x40\n __kasan_record_aux_stack+0x9e/0xc0\n kvfree_call_rcu+0x84/0x480\n timerfd_release+0x82/0x140\n __fput+0xfa/0x400\n task_work_run+0x80/0xc0\n exit_to_user_mode_prepare+0x155/0x160\n syscall_exit_to_user_mode+0x12/0x40\n do_syscall_64+0x42/0xc0\n entry_SYSCALL_64_after_hwframe+0x46/0xb0\n\nThe buggy address belongs to the object at ffff889108f3d200\n which belongs to the cache kmalloc-256 of size 256\nThe buggy address is located 0 bytes to the right of\n 256-byte region [ffff889108f3d200, ffff889108f3d300)\n\nThe buggy address belongs to the physical page:\npage:000000007ef2a34c refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1108f3c\nhead:000000007ef2a34c order:2 compound_mapcount:0 compound_pincount:0\nflags: 0x4000000000010200(slab|head|zone=2)\nraw: 4000000000010200 0000000000000000 dead000000000001 ffff889100042b40\nraw: 0000000000000000 0000000080200020 00000001ffffffff 0000000000000000\npage dumped because: kasan: bad access detected\n\nMemory state around the buggy address:\n ffff889108f3d200: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00\n ffff889108f3d280: 00 00\n---truncated---",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "kernel: md-raid10: fix KASAN warning",
"title": "Vulnerability summary"
},
{
"category": "general",
"text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
"title": "CVSS score applicability"
}
],
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"category": "self",
"summary": "Canonical URL",
"url": "https://access.redhat.com/security/cve/CVE-2022-50211"
},
{
"category": "external",
"summary": "RHBZ#2373662",
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2373662"
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{
"category": "external",
"summary": "https://www.cve.org/CVERecord?id=CVE-2022-50211",
"url": "https://www.cve.org/CVERecord?id=CVE-2022-50211"
},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2022-50211",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2022-50211"
},
{
"category": "external",
"summary": "https://lore.kernel.org/linux-cve-announce/2025061843-CVE-2022-50211-393a@gregkh/T",
"url": "https://lore.kernel.org/linux-cve-announce/2025061843-CVE-2022-50211-393a@gregkh/T"
}
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"release_date": "2025-06-18T00:00:00+00:00",
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{
"category": "vendor_fix",
"date": "2025-09-10T18:25:22+00:00",
"details": "For details on how to apply this update, which includes the changes described in this advisory, refer to:\n\nhttps://access.redhat.com/articles/11258\n\nThe system must be rebooted for this update to take effect.",
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},
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"text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
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"text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
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"title": "kernel: posix-cpu-timers: fix race between handle_posix_cpu_timers() and posix_cpu_timer_del()"
},
{
"cve": "CVE-2025-38464",
"cwe": {
"id": "CWE-416",
"name": "Use After Free"
},
"discovery_date": "2025-07-25T00:00:00+00:00",
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"system_name": "Red Hat Bugzilla ID",
"text": "2383509"
}
],
"notes": [
{
"category": "description",
"text": "In the Linux kernel, the following vulnerability has been resolved:\n\ntipc: Fix use-after-free in tipc_conn_close().\n\nsyzbot reported a null-ptr-deref in tipc_conn_close() during netns\ndismantle. [0]\n\ntipc_topsrv_stop() iterates tipc_net(net)-\u003etopsrv-\u003econn_idr and calls\ntipc_conn_close() for each tipc_conn.\n\nThe problem is that tipc_conn_close() is called after releasing the\nIDR lock.\n\nAt the same time, there might be tipc_conn_recv_work() running and it\ncould call tipc_conn_close() for the same tipc_conn and release its\nlast -\u003ekref.\n\nOnce we release the IDR lock in tipc_topsrv_stop(), there is no\nguarantee that the tipc_conn is alive.\n\nLet\u0027s hold the ref before releasing the lock and put the ref after\ntipc_conn_close() in tipc_topsrv_stop().\n\n[0]:\nBUG: KASAN: use-after-free in tipc_conn_close+0x122/0x140 net/tipc/topsrv.c:165\nRead of size 8 at addr ffff888099305a08 by task kworker/u4:3/435\n\nCPU: 0 PID: 435 Comm: kworker/u4:3 Not tainted 4.19.204-syzkaller #0\nHardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011\nWorkqueue: netns cleanup_net\nCall Trace:\n __dump_stack lib/dump_stack.c:77 [inline]\n dump_stack+0x1fc/0x2ef lib/dump_stack.c:118\n print_address_description.cold+0x54/0x219 mm/kasan/report.c:256\n kasan_report_error.cold+0x8a/0x1b9 mm/kasan/report.c:354\n kasan_report mm/kasan/report.c:412 [inline]\n __asan_report_load8_noabort+0x88/0x90 mm/kasan/report.c:433\n tipc_conn_close+0x122/0x140 net/tipc/topsrv.c:165\n tipc_topsrv_stop net/tipc/topsrv.c:701 [inline]\n tipc_topsrv_exit_net+0x27b/0x5c0 net/tipc/topsrv.c:722\n ops_exit_list+0xa5/0x150 net/core/net_namespace.c:153\n cleanup_net+0x3b4/0x8b0 net/core/net_namespace.c:553\n process_one_work+0x864/0x1570 kernel/workqueue.c:2153\n worker_thread+0x64c/0x1130 kernel/workqueue.c:2296\n kthread+0x33f/0x460 kernel/kthread.c:259\n ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:415\n\nAllocated by task 23:\n kmem_cache_alloc_trace+0x12f/0x380 mm/slab.c:3625\n kmalloc include/linux/slab.h:515 [inline]\n kzalloc include/linux/slab.h:709 [inline]\n tipc_conn_alloc+0x43/0x4f0 net/tipc/topsrv.c:192\n tipc_topsrv_accept+0x1b5/0x280 net/tipc/topsrv.c:470\n process_one_work+0x864/0x1570 kernel/workqueue.c:2153\n worker_thread+0x64c/0x1130 kernel/workqueue.c:2296\n kthread+0x33f/0x460 kernel/kthread.c:259\n ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:415\n\nFreed by task 23:\n __cache_free mm/slab.c:3503 [inline]\n kfree+0xcc/0x210 mm/slab.c:3822\n tipc_conn_kref_release net/tipc/topsrv.c:150 [inline]\n kref_put include/linux/kref.h:70 [inline]\n conn_put+0x2cd/0x3a0 net/tipc/topsrv.c:155\n process_one_work+0x864/0x1570 kernel/workqueue.c:2153\n worker_thread+0x64c/0x1130 kernel/workqueue.c:2296\n kthread+0x33f/0x460 kernel/kthread.c:259\n ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:415\n\nThe buggy address belongs to the object at ffff888099305a00\n which belongs to the cache kmalloc-512 of size 512\nThe buggy address is located 8 bytes inside of\n 512-byte region [ffff888099305a00, ffff888099305c00)\nThe buggy address belongs to the page:\npage:ffffea000264c140 count:1 mapcount:0 mapping:ffff88813bff0940 index:0x0\nflags: 0xfff00000000100(slab)\nraw: 00fff00000000100 ffffea00028b6b88 ffffea0002cd2b08 ffff88813bff0940\nraw: 0000000000000000 ffff888099305000 0000000100000006 0000000000000000\npage dumped because: kasan: bad access detected\n\nMemory state around the buggy address:\n ffff888099305900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb\n ffff888099305980: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc\n\u003effff888099305a00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb\n ^\n ffff888099305a80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb\n ffff888099305b00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "kernel: tipc: Fix use-after-free in tipc_conn_close()",
"title": "Vulnerability summary"
},
{
"category": "other",
"text": "A Use-After-Free vulnerability was found in tipc_conn_close() in the TIPC subsystem during the cleanup of network namespaces. The race condition between tipc_topsrv_stop() and tipc_conn_recv_work() could result in accessing a freed tipc_conn structure, leading to kernel crash or potential memory corruption. The bug was triggered by syzbot and fixed by ensuring proper reference counting.\n\nThe most straightforward exploitation scenario is a local Denial of Service (DoS), where an unprivileged user with the ability to create user and network namespaces spawns TIPC connections and then triggers network namespace teardown, creating a race condition that causes a use-after-free in tipc_conn_close(). This reliably leads to a kernel panic.\n\nA hypothetical future scenario involves local privilege escalation, if the attacker can win the race and reallocate the freed object in a controlled way (e.g., via kmalloc-512 slab reusage), leading to memory corruption or hijacking of kernel control flow.\n\nImportantly, this can be triggered without root privileges if the system allows unprivileged creation of user and net namespaces, which is the case on many Linux distributions (/proc/sys/user/max_user_namespaces \u003e 0 and kernel.unprivileged_userns_clone=1).\nIn such environments, a regular user can execute the TIPC socket creation, manipulate netns teardown, and provoke the race condition required for exploitation.",
"title": "Statement"
},
{
"category": "general",
"text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
"title": "CVSS score applicability"
}
],
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{
"category": "self",
"summary": "Canonical URL",
"url": "https://access.redhat.com/security/cve/CVE-2025-38464"
},
{
"category": "external",
"summary": "RHBZ#2383509",
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2383509"
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{
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"url": "https://www.cve.org/CVERecord?id=CVE-2025-38464"
},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2025-38464",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2025-38464"
},
{
"category": "external",
"summary": "https://lore.kernel.org/linux-cve-announce/2025072508-CVE-2025-38464-44a1@gregkh/T",
"url": "https://lore.kernel.org/linux-cve-announce/2025072508-CVE-2025-38464-44a1@gregkh/T"
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"release_date": "2025-07-25T00:00:00+00:00",
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{
"category": "vendor_fix",
"date": "2025-09-10T18:25:22+00:00",
"details": "For details on how to apply this update, which includes the changes described in this advisory, refer to:\n\nhttps://access.redhat.com/articles/11258\n\nThe system must be rebooted for this update to take effect.",
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"scores": [
{
"cvss_v3": {
"attackComplexity": "LOW",
"attackVector": "LOCAL",
"availabilityImpact": "HIGH",
"baseScore": 7.3,
"baseSeverity": "HIGH",
"confidentialityImpact": "HIGH",
"integrityImpact": "LOW",
"privilegesRequired": "LOW",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:H",
"version": "3.1"
},
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]
}
],
"threats": [
{
"category": "impact",
"details": "Moderate"
}
],
"title": "kernel: tipc: Fix use-after-free in tipc_conn_close()"
}
]
}
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Sightings
| Author | Source | Type | Date |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
- Confirmed: The vulnerability is confirmed from an analyst perspective.
- Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
- Patched: This vulnerability was successfully patched by the user reporting the sighting.
- Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
- Not confirmed: The user expresses doubt about the veracity of the vulnerability.
- Not patched: This vulnerability was not successfully patched by the user reporting the sighting.
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