{ "document": { "aggregate_severity": { "namespace": "https://access.redhat.com/security/updates/classification/", "text": "Moderate" }, "category": "csaf_security_advisory", "csaf_version": "2.0", "distribution": { "text": "Copyright © Red Hat, Inc. All rights reserved.", "tlp": { "label": "WHITE", "url": "https://www.first.org/tlp/" } }, "lang": "en", "notes": [ { "category": "summary", "text": "An update for kernel-rt is now available for Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions.\n\nRed Hat Product Security has rated this update as having a security impact of Moderate. 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.", "title": "Topic" }, { "category": "general", "text": "The kernel-rt packages provide the Real Time Linux Kernel, which enables fine-tuning for systems with extremely high determinism requirements.\n\nSecurity Fix(es):\n\n* kernel: bpf: fix OOB devmap writes when deleting elements (CVE-2024-56615)\n\n* kernel: xsk: fix OOB map writes when deleting elements (CVE-2024-56614)\n\n* kernel: md: fix mddev uaf while iterating all_mddevs list (CVE-2025-22126)\n\nFor 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.", "title": "Details" }, { "category": "legal_disclaimer", "text": "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.", "title": "Terms of Use" } ], "publisher": { "category": "vendor", "contact_details": "https://access.redhat.com/security/team/contact/", "issuing_authority": "Red Hat Product Security is responsible for vulnerability handling across all Red Hat products and services.", "name": "Red Hat Product Security", "namespace": "https://www.redhat.com" }, "references": [ { "category": "self", "summary": "https://access.redhat.com/errata/RHSA-2025:10536", "url": "https://access.redhat.com/errata/RHSA-2025:10536" }, { "category": "external", "summary": "https://access.redhat.com/security/updates/classification/#moderate", "url": "https://access.redhat.com/security/updates/classification/#moderate" }, { "category": "external", "summary": "2334493", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2334493" }, { "category": "external", "summary": "2334573", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2334573" }, { "category": "external", "summary": "2360236", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2360236" }, { "category": "self", "summary": "Canonical URL", "url": "https://security.access.redhat.com/data/csaf/v2/advisories/2025/rhsa-2025_10536.json" } ], "title": "Red Hat Security Advisory: kernel-rt security update", "tracking": { "current_release_date": "2026-06-30T03:30:26+00:00", "generator": { "date": "2026-06-30T03:30:26+00:00", "engine": { "name": "Red Hat SDEngine", "version": "5.3.0" } }, "id": "RHSA-2025:10536", "initial_release_date": "2025-07-08T00:13:53+00:00", "revision_history": [ { "date": "2025-07-08T00:13:53+00:00", "number": "1", "summary": "Initial version" }, { "date": "2025-07-08T00:13:53+00:00", "number": "2", "summary": "Last updated version" }, { "date": "2026-06-30T03:30:26+00:00", "number": "3", "summary": "Last generated version" } ], "status": "final", "version": "3" } }, "product_tree": 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"kernel-rt-modules-core-0:5.14.0-284.122.1.rt14.407.el9_2.x86_64", "relates_to_product_reference": "RT-9.2.0.Z.E4S" }, { "category": "default_component_of", "full_product_name": { "name": "kernel-rt-modules-extra-0:5.14.0-284.122.1.rt14.407.el9_2.x86_64 as a component of Red Hat Enterprise Linux Real Time E4S (v.9.2)", "product_id": "RT-9.2.0.Z.E4S:kernel-rt-modules-extra-0:5.14.0-284.122.1.rt14.407.el9_2.x86_64" }, "product_reference": "kernel-rt-modules-extra-0:5.14.0-284.122.1.rt14.407.el9_2.x86_64", "relates_to_product_reference": "RT-9.2.0.Z.E4S" } ] }, "vulnerabilities": [ { "cve": "CVE-2024-56614", "cwe": { "id": "CWE-99", "name": "Improper Control of Resource Identifiers ('Resource Injection')" }, "discovery_date": "2024-12-27T00:00:00+00:00", "ids": [ { "system_name": "Red Hat Bugzilla ID", "text": "2334573" } ], "notes": [ { "category": "description", "text": "In the Linux kernel, the following vulnerability has been resolved:\n\nxsk: fix OOB map writes when deleting elements\n\nJordy says:\n\n\"\nIn the xsk_map_delete_elem function an unsigned integer\n(map->max_entries) is compared with a user-controlled signed integer\n(k). Due to implicit type conversion, a large unsigned value for\nmap->max_entries can bypass the intended bounds check:\n\n\tif (k >= map->max_entries)\n\t\treturn -EINVAL;\n\nThis allows k to hold a negative value (between -2147483648 and -2),\nwhich is then used as an array index in m->xsk_map[k], which results\nin an out-of-bounds access.\n\n\tspin_lock_bh(&m->lock);\n\tmap_entry = &m->xsk_map[k]; // Out-of-bounds map_entry\n\told_xs = unrcu_pointer(xchg(map_entry, NULL)); // Oob write\n\tif (old_xs)\n\t\txsk_map_sock_delete(old_xs, map_entry);\n\tspin_unlock_bh(&m->lock);\n\nThe xchg operation can then be used to cause an out-of-bounds write.\nMoreover, the invalid map_entry passed to xsk_map_sock_delete can lead\nto further memory corruption.\n\"\n\nIt indeed results in following splat:\n\n[76612.897343] BUG: unable to handle page fault for address: ffffc8fc2e461108\n[76612.904330] #PF: supervisor write access in kernel mode\n[76612.909639] #PF: error_code(0x0002) - not-present page\n[76612.914855] PGD 0 P4D 0\n[76612.917431] Oops: Oops: 0002 [#1] PREEMPT SMP\n[76612.921859] CPU: 11 UID: 0 PID: 10318 Comm: a.out Not tainted 6.12.0-rc1+ #470\n[76612.929189] Hardware name: Intel Corporation S2600WFT/S2600WFT, BIOS SE5C620.86B.02.01.0008.031920191559 03/19/2019\n[76612.939781] RIP: 0010:xsk_map_delete_elem+0x2d/0x60\n[76612.944738] Code: 00 00 41 54 55 53 48 63 2e 3b 6f 24 73 38 4c 8d a7 f8 00 00 00 48 89 fb 4c 89 e7 e8 2d bf 05 00 48 8d b4 eb 00 01 00 00 31 ff <48> 87 3e 48 85 ff 74 05 e8 16 ff ff ff 4c 89 e7 e8 3e bc 05 00 31\n[76612.963774] RSP: 0018:ffffc9002e407df8 EFLAGS: 00010246\n[76612.969079] RAX: 0000000000000000 RBX: ffffc9002e461000 RCX: 0000000000000000\n[76612.976323] RDX: 0000000000000001 RSI: ffffc8fc2e461108 RDI: 0000000000000000\n[76612.983569] RBP: ffffffff80000001 R08: 0000000000000000 R09: 0000000000000007\n[76612.990812] R10: ffffc9002e407e18 R11: ffff888108a38858 R12: ffffc9002e4610f8\n[76612.998060] R13: ffff888108a38858 R14: 00007ffd1ae0ac78 R15: ffffc9002e4610c0\n[76613.005303] FS: 00007f80b6f59740(0000) GS:ffff8897e0ec0000(0000) knlGS:0000000000000000\n[76613.013517] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033\n[76613.019349] CR2: ffffc8fc2e461108 CR3: 000000011e3ef001 CR4: 00000000007726f0\n[76613.026595] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000\n[76613.033841] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400\n[76613.041086] PKRU: 55555554\n[76613.043842] Call Trace:\n[76613.046331] \n[76613.048468] ? __die+0x20/0x60\n[76613.051581] ? page_fault_oops+0x15a/0x450\n[76613.055747] ? search_extable+0x22/0x30\n[76613.059649] ? search_bpf_extables+0x5f/0x80\n[76613.063988] ? exc_page_fault+0xa9/0x140\n[76613.067975] ? asm_exc_page_fault+0x22/0x30\n[76613.072229] ? xsk_map_delete_elem+0x2d/0x60\n[76613.076573] ? xsk_map_delete_elem+0x23/0x60\n[76613.080914] __sys_bpf+0x19b7/0x23c0\n[76613.084555] __x64_sys_bpf+0x1a/0x20\n[76613.088194] do_syscall_64+0x37/0xb0\n[76613.091832] entry_SYSCALL_64_after_hwframe+0x4b/0x53\n[76613.096962] RIP: 0033:0x7f80b6d1e88d\n[76613.100592] Code: 5b 41 5c c3 66 0f 1f 84 00 00 00 00 00 f3 0f 1e fa 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d 73 b5 0f 00 f7 d8 64 89 01 48\n[76613.119631] RSP: 002b:00007ffd1ae0ac68 EFLAGS: 00000206 ORIG_RAX: 0000000000000141\n[76613.131330] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f80b6d1e88d\n[76613.142632] RDX: 0000000000000098 RSI: 00007ffd1ae0ad20 RDI: 0000000000000003\n[76613.153967] RBP: 00007ffd1ae0adc0 R08: 0000000000000000 R09: 0000000000000000\n[76613.166030] R10: 00007f80b6f77040 R11: 0000000000000206 R12: 00007ffd1ae0aed8\n[76613.177130] R13: 000055ddf42ce1e9 R14: 000055ddf42d0d98 R15: 00\n---truncated---", "title": "Vulnerability description" }, { "category": "summary", "text": "kernel: xsk: fix OOB map writes when deleting elements", "title": "Vulnerability summary" }, { "category": "other", "text": "For the Red Hat Enterprise Linux 8/9 to confirm the current state, inspect the sysctl with the command:\n\n cat /proc/sys/kernel/unprivileged_bpf_disabled\n\nThe setting of 1 or 2 would mean that unprivileged users can not use eBPF, mitigating the flaw. The difference between the two is a value of 2 means that it can be re-enabled without a reboot, while a value of 1 requires a reboot to take effect.", "title": "Statement" }, { "category": "general", "text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.", "title": "CVSS score applicability" } ], "product_status": { "fixed": [ "NFV-9.2.0.Z.E4S:kernel-rt-0:5.14.0-284.122.1.rt14.407.el9_2.src", "NFV-9.2.0.Z.E4S:kernel-rt-0:5.14.0-284.122.1.rt14.407.el9_2.x86_64", "NFV-9.2.0.Z.E4S:kernel-rt-core-0:5.14.0-284.122.1.rt14.407.el9_2.x86_64", "NFV-9.2.0.Z.E4S:kernel-rt-debug-0:5.14.0-284.122.1.rt14.407.el9_2.x86_64", "NFV-9.2.0.Z.E4S:kernel-rt-debug-core-0:5.14.0-284.122.1.rt14.407.el9_2.x86_64", "NFV-9.2.0.Z.E4S:kernel-rt-debug-debuginfo-0:5.14.0-284.122.1.rt14.407.el9_2.x86_64", 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Fix is simple as changing the type from int to\nu32, however, when compared to XSKMAP case, one more thing needs to be\naddressed.\n\nWhen map is released from system via dev_map_free(), we iterate through\nall of the entries and an iterator variable is also an int, which\nimplies OOB accesses. Again, change it to be u32.\n\nExample splat below:\n\n[ 160.724676] BUG: unable to handle page fault for address: ffffc8fc2c001000\n[ 160.731662] #PF: supervisor read access in kernel mode\n[ 160.736876] #PF: error_code(0x0000) - not-present page\n[ 160.742095] PGD 0 P4D 0\n[ 160.744678] Oops: Oops: 0000 [#1] PREEMPT SMP\n[ 160.749106] CPU: 1 UID: 0 PID: 520 Comm: kworker/u145:12 Not tainted 6.12.0-rc1+ #487\n[ 160.757050] Hardware name: Intel Corporation S2600WFT/S2600WFT, BIOS SE5C620.86B.02.01.0008.031920191559 03/19/2019\n[ 160.767642] Workqueue: events_unbound bpf_map_free_deferred\n[ 160.773308] RIP: 0010:dev_map_free+0x77/0x170\n[ 160.777735] Code: 00 e8 fd 91 ed ff e8 b8 73 ed ff 41 83 7d 18 19 74 6e 41 8b 45 24 49 8b bd f8 00 00 00 31 db 85 c0 74 48 48 63 c3 48 8d 04 c7 <48> 8b 28 48 85 ed 74 30 48 8b 7d 18 48 85 ff 74 05 e8 b3 52 fa ff\n[ 160.796777] RSP: 0018:ffffc9000ee1fe38 EFLAGS: 00010202\n[ 160.802086] RAX: ffffc8fc2c001000 RBX: 0000000080000000 RCX: 0000000000000024\n[ 160.809331] RDX: 0000000000000000 RSI: 0000000000000024 RDI: ffffc9002c001000\n[ 160.816576] RBP: 0000000000000000 R08: 0000000000000023 R09: 0000000000000001\n[ 160.823823] R10: 0000000000000001 R11: 00000000000ee6b2 R12: dead000000000122\n[ 160.831066] R13: ffff88810c928e00 R14: ffff8881002df405 R15: 0000000000000000\n[ 160.838310] FS: 0000000000000000(0000) GS:ffff8897e0c40000(0000) knlGS:0000000000000000\n[ 160.846528] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033\n[ 160.852357] CR2: ffffc8fc2c001000 CR3: 0000000005c32006 CR4: 00000000007726f0\n[ 160.859604] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000\n[ 160.866847] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400\n[ 160.874092] PKRU: 55555554\n[ 160.876847] Call Trace:\n[ 160.879338] \n[ 160.881477] ? __die+0x20/0x60\n[ 160.884586] ? page_fault_oops+0x15a/0x450\n[ 160.888746] ? search_extable+0x22/0x30\n[ 160.892647] ? search_bpf_extables+0x5f/0x80\n[ 160.896988] ? exc_page_fault+0xa9/0x140\n[ 160.900973] ? asm_exc_page_fault+0x22/0x30\n[ 160.905232] ? dev_map_free+0x77/0x170\n[ 160.909043] ? dev_map_free+0x58/0x170\n[ 160.912857] bpf_map_free_deferred+0x51/0x90\n[ 160.917196] process_one_work+0x142/0x370\n[ 160.921272] worker_thread+0x29e/0x3b0\n[ 160.925082] ? rescuer_thread+0x4b0/0x4b0\n[ 160.929157] kthread+0xd4/0x110\n[ 160.932355] ? kthread_park+0x80/0x80\n[ 160.936079] ret_from_fork+0x2d/0x50\n[ 160.943396] ? kthread_park+0x80/0x80\n[ 160.950803] ret_from_fork_asm+0x11/0x20\n[ 160.958482] ", "title": "Vulnerability description" }, { "category": "summary", "text": "kernel: bpf: fix OOB devmap writes when deleting elements", "title": "Vulnerability summary" }, { "category": "other", "text": "For the Red Hat Enterprise Linux 8/9 to confirm the current state, inspect the sysctl with the command:\n\n cat /proc/sys/kernel/unprivileged_bpf_disabled\n\nThe setting of 1 or 2 would mean that unprivileged users can not use eBPF, mitigating the flaw. The difference between the two is a value of 2 means that it can be re-enabled without a reboot, while a value of 1 requires a reboot to take effect.", "title": "Statement" }, { "category": "general", "text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.", "title": "CVSS score applicability" } ], "product_status": { "fixed": [ "NFV-9.2.0.Z.E4S:kernel-rt-0:5.14.0-284.122.1.rt14.407.el9_2.src", "NFV-9.2.0.Z.E4S:kernel-rt-0:5.14.0-284.122.1.rt14.407.el9_2.x86_64", "NFV-9.2.0.Z.E4S:kernel-rt-core-0:5.14.0-284.122.1.rt14.407.el9_2.x86_64", "NFV-9.2.0.Z.E4S:kernel-rt-debug-0:5.14.0-284.122.1.rt14.407.el9_2.x86_64", "NFV-9.2.0.Z.E4S:kernel-rt-debug-core-0:5.14.0-284.122.1.rt14.407.el9_2.x86_64", "NFV-9.2.0.Z.E4S:kernel-rt-debug-debuginfo-0:5.14.0-284.122.1.rt14.407.el9_2.x86_64", 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"https://lore.kernel.org/linux-cve-announce/2024122708-CVE-2024-56615-5148@gregkh/T" } ], "release_date": "2024-12-27T00:00:00+00:00", "remediations": [ { "category": "vendor_fix", "date": "2025-07-08T00:13:53+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.", "product_ids": [ "NFV-9.2.0.Z.E4S:kernel-rt-0:5.14.0-284.122.1.rt14.407.el9_2.src", "NFV-9.2.0.Z.E4S:kernel-rt-0:5.14.0-284.122.1.rt14.407.el9_2.x86_64", "NFV-9.2.0.Z.E4S:kernel-rt-core-0:5.14.0-284.122.1.rt14.407.el9_2.x86_64", "NFV-9.2.0.Z.E4S:kernel-rt-debug-0:5.14.0-284.122.1.rt14.407.el9_2.x86_64", "NFV-9.2.0.Z.E4S:kernel-rt-debug-core-0:5.14.0-284.122.1.rt14.407.el9_2.x86_64", "NFV-9.2.0.Z.E4S:kernel-rt-debug-debuginfo-0:5.14.0-284.122.1.rt14.407.el9_2.x86_64", "NFV-9.2.0.Z.E4S:kernel-rt-debug-devel-0:5.14.0-284.122.1.rt14.407.el9_2.x86_64", 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Linux kernel’s MD (multiple device) subsystem during iteration over the all_mddevs list in functions such as md_notify_reboot() and md_exit(). The code used list_for_each_entry_safe, but released locks before completing reference counting, allowing concurrent deletion and freeing of an mddev entry. This led to a use-after-free when the kernel continued to reference freed mddev structures. A local user with low privileges could trigger this to corrupt memory and cause a denial of service. The issue has been resolved by reworking the iteration logic, introducing proper locking and reference handling (mddev_put_locked()), and switching to list_for_each_entry to avoid unsafe continuation across deletions", "title": "Vulnerability description" }, { "category": "summary", "text": "kernel: md: fix mddev uaf while iterating all_mddevs list", "title": "Vulnerability summary" }, { "category": "general", "text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.", "title": "CVSS score applicability" } ], "product_status": { "fixed": [ "NFV-9.2.0.Z.E4S:kernel-rt-0:5.14.0-284.122.1.rt14.407.el9_2.src", "NFV-9.2.0.Z.E4S:kernel-rt-0:5.14.0-284.122.1.rt14.407.el9_2.x86_64", "NFV-9.2.0.Z.E4S:kernel-rt-core-0:5.14.0-284.122.1.rt14.407.el9_2.x86_64", "NFV-9.2.0.Z.E4S:kernel-rt-debug-0:5.14.0-284.122.1.rt14.407.el9_2.x86_64", 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