RHSA-2026:69874
Vulnerability from csaf_redhat - Published: 2026-09-22 08:07 - Updated: 2026-09-24 09:39Summary
Red Hat Security Advisory: kernel security update
Severity
Important
Notes
Topic: An update for kernel is now available for Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support and Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On.
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: smc: Fix use-after-free in tcp_write_timer_handler() (CVE-2023-53781)
* kernel: fanotify: fix false positive on permission events (CVE-2026-46150)
* kernel: netfilter: conntrack: remove sprintf usage (CVE-2026-53002)
* kernel: tipc: fix double-free in tipc_buf_append() (CVE-2026-52993)
* kernel: scsi: target: iscsi: Fix CRC overread and double-free in iscsit_handle_text_cmd() (CVE-2026-63888)
* kernel: scsi: target: iscsi: Bound iscsi_encode_text_output() appends to rsp_buf (CVE-2026-63887)
* kernel: sctp: don't free the ASCONF's own transport in DEL-IP processing (CVE-2026-64564)
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.
In the Linux kernel, the following vulnerability has been resolved: smc: Fix use-after-free in tcp_write_timer_handler(). With Eric's ref tracker, syzbot finally found a repro for use-after-free in tcp_write_timer_handler() by kernel TCP sockets. [0] If SMC creates a kernel socket in __smc_create(), the kernel socket is supposed to be freed in smc_clcsock_release() by calling sock_release() when we close() the parent SMC socket. However, at the end of smc_clcsock_release(), the kernel socket's sk_state might not be TCP_CLOSE. This means that we have not called inet_csk_destroy_sock() in __tcp_close() and have not stopped the TCP timers. The kernel socket's TCP timers can be fired later, so we need to hold a refcnt for net as we do for MPTCP subflows in mptcp_subflow_create_socket(). [0]: leaked reference. sk_alloc (./include/net/net_namespace.h:335 net/core/sock.c:2108) inet_create (net/ipv4/af_inet.c:319 net/ipv4/af_inet.c:244) __sock_create (net/socket.c:1546) smc_create (net/smc/af_smc.c:3269 net/smc/af_smc.c:3284) __sock_create (net/socket.c:1546) __sys_socket (net/socket.c:1634 net/socket.c:1618 net/socket.c:1661) __x64_sys_socket (net/socket.c:1672) do_syscall_64 (arch/x86/entry/common.c:50 arch/x86/entry/common.c:80) entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:120) ================================================================== BUG: KASAN: slab-use-after-free in tcp_write_timer_handler (net/ipv4/tcp_timer.c:378 net/ipv4/tcp_timer.c:624 net/ipv4/tcp_timer.c:594) Read of size 1 at addr ffff888052b65e0d by task syzrepro/18091 CPU: 0 PID: 18091 Comm: syzrepro Tainted: G W 6.3.0-rc4-01174-gb5d54eb5899a #7 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.16.0-1.amzn2022.0.1 04/01/2014 Call Trace: <IRQ> dump_stack_lvl (lib/dump_stack.c:107) print_report (mm/kasan/report.c:320 mm/kasan/report.c:430) kasan_report (mm/kasan/report.c:538) tcp_write_timer_handler (net/ipv4/tcp_timer.c:378 net/ipv4/tcp_timer.c:624 net/ipv4/tcp_timer.c:594) tcp_write_timer (./include/linux/spinlock.h:390 net/ipv4/tcp_timer.c:643) call_timer_fn (./arch/x86/include/asm/jump_label.h:27 ./include/linux/jump_label.h:207 ./include/trace/events/timer.h:127 kernel/time/timer.c:1701) __run_timers.part.0 (kernel/time/timer.c:1752 kernel/time/timer.c:2022) run_timer_softirq (kernel/time/timer.c:2037) __do_softirq (./arch/x86/include/asm/jump_label.h:27 ./include/linux/jump_label.h:207 ./include/trace/events/irq.h:142 kernel/softirq.c:572) __irq_exit_rcu (kernel/softirq.c:445 kernel/softirq.c:650) irq_exit_rcu (kernel/softirq.c:664) sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1107 (discriminator 14)) </IRQ>
7.3 (High)
Affected products
Fixed
121 products
| Product | Identifier | Version | Remediation |
|---|---|---|---|
| Unresolved product id: BaseOS-8.4.0.Z.AUS:bpftool-0:4.18.0-305.208.1.el8_4.x86_64 | — |
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| Unresolved product id: BaseOS-8.4.0.Z.AUS:bpftool-debuginfo-0:4.18.0-305.208.1.el8_4.x86_64 | — |
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| Unresolved product id: BaseOS-8.4.0.Z.AUS:kernel-0:4.18.0-305.208.1.el8_4.src | — |
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| Unresolved product id: BaseOS-8.4.0.Z.AUS:kernel-0:4.18.0-305.208.1.el8_4.x86_64 | — |
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| Unresolved product id: BaseOS-8.4.0.Z.AUS:kernel-abi-stablelists-0:4.18.0-305.208.1.el8_4.noarch | — |
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| Unresolved product id: BaseOS-8.4.0.Z.AUS:kernel-core-0:4.18.0-305.208.1.el8_4.x86_64 | — |
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| Unresolved product id: BaseOS-8.4.0.Z.AUS:kernel-debug-0:4.18.0-305.208.1.el8_4.x86_64 | — |
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| Unresolved product id: BaseOS-8.4.0.Z.AUS:kernel-debug-core-0:4.18.0-305.208.1.el8_4.x86_64 | — |
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| Unresolved product id: BaseOS-8.4.0.Z.AUS:kernel-debug-debuginfo-0:4.18.0-305.208.1.el8_4.x86_64 | — |
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| Unresolved product id: BaseOS-8.4.0.Z.AUS:kernel-debug-devel-0:4.18.0-305.208.1.el8_4.x86_64 | — |
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| Unresolved product id: BaseOS-8.4.0.Z.AUS:kernel-debug-modules-0:4.18.0-305.208.1.el8_4.x86_64 | — |
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| Unresolved product id: BaseOS-8.4.0.Z.AUS:kernel-debug-modules-extra-0:4.18.0-305.208.1.el8_4.x86_64 | — |
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| Unresolved product id: BaseOS-8.4.0.Z.AUS:kernel-debuginfo-0:4.18.0-305.208.1.el8_4.x86_64 | — |
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| Unresolved product id: BaseOS-8.4.0.Z.AUS:kernel-debuginfo-common-x86_64-0:4.18.0-305.208.1.el8_4.x86_64 | — |
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| Unresolved product id: BaseOS-8.4.0.Z.AUS:kernel-devel-0:4.18.0-305.208.1.el8_4.x86_64 | — |
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| Unresolved product id: BaseOS-8.4.0.Z.AUS:kernel-doc-0:4.18.0-305.208.1.el8_4.noarch | — |
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| Unresolved product id: BaseOS-8.4.0.Z.AUS:kernel-modules-0:4.18.0-305.208.1.el8_4.x86_64 | — |
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| Unresolved product id: BaseOS-8.4.0.Z.AUS:kernel-modules-extra-0:4.18.0-305.208.1.el8_4.x86_64 | — |
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| Unresolved product id: BaseOS-8.4.0.Z.AUS:kernel-tools-0:4.18.0-305.208.1.el8_4.x86_64 | — |
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| Unresolved product id: BaseOS-8.4.0.Z.AUS:kernel-tools-debuginfo-0:4.18.0-305.208.1.el8_4.x86_64 | — |
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| Unresolved product id: BaseOS-8.4.0.Z.AUS:kernel-tools-libs-0:4.18.0-305.208.1.el8_4.x86_64 | — |
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| Unresolved product id: BaseOS-8.4.0.Z.AUS:perf-0:4.18.0-305.208.1.el8_4.x86_64 | — |
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| Unresolved product id: BaseOS-8.4.0.Z.AUS:perf-debuginfo-0:4.18.0-305.208.1.el8_4.x86_64 | — |
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| Unresolved product id: BaseOS-8.4.0.Z.AUS:python3-perf-0:4.18.0-305.208.1.el8_4.x86_64 | — |
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| Unresolved product id: BaseOS-8.4.0.Z.AUS:python3-perf-debuginfo-0:4.18.0-305.208.1.el8_4.x86_64 | — |
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| Unresolved product id: BaseOS-8.4.0.Z.EUS.EXTENSION:bpftool-0:4.18.0-305.208.1.el8_4.aarch64 | — |
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| Unresolved product id: BaseOS-8.4.0.Z.EUS.EXTENSION:bpftool-0:4.18.0-305.208.1.el8_4.ppc64le | — |
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| Unresolved product id: BaseOS-8.4.0.Z.EUS.EXTENSION:kernel-0:4.18.0-305.208.1.el8_4.src | — |
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| Unresolved product id: BaseOS-8.4.0.Z.EUS.EXTENSION:kernel-0:4.18.0-305.208.1.el8_4.x86_64 | — |
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| Unresolved product id: BaseOS-8.4.0.Z.EUS.EXTENSION:kernel-abi-stablelists-0:4.18.0-305.208.1.el8_4.noarch | — |
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| Unresolved product id: BaseOS-8.4.0.Z.EUS.EXTENSION:kernel-core-0:4.18.0-305.208.1.el8_4.aarch64 | — |
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| Unresolved product id: BaseOS-8.4.0.Z.EUS.EXTENSION:kernel-core-0:4.18.0-305.208.1.el8_4.ppc64le | — |
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| Unresolved product id: BaseOS-8.4.0.Z.EUS.EXTENSION:kernel-core-0:4.18.0-305.208.1.el8_4.s390x | — |
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| Unresolved product id: BaseOS-8.4.0.Z.EUS.EXTENSION:kernel-core-0:4.18.0-305.208.1.el8_4.x86_64 | — |
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| Unresolved product id: BaseOS-8.4.0.Z.EUS.EXTENSION:kernel-debug-debuginfo-0:4.18.0-305.208.1.el8_4.ppc64le | — |
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| Unresolved product id: BaseOS-8.4.0.Z.EUS.EXTENSION:kernel-debug-debuginfo-0:4.18.0-305.208.1.el8_4.s390x | — |
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| Unresolved product id: BaseOS-8.4.0.Z.EUS.EXTENSION:kernel-debug-debuginfo-0:4.18.0-305.208.1.el8_4.x86_64 | — |
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| Unresolved product id: BaseOS-8.4.0.Z.EUS.EXTENSION:python3-perf-debuginfo-0:4.18.0-305.208.1.el8_4.ppc64le | — |
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Vendor Fix
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Threats
Impact
Moderate
A flaw was found in the Linux kernel's fanotify subsystem. This vulnerability allows for a bypass of permission checks because the `fsnotify_get_mark_safe()` function may incorrectly return false for marks on unrelated groups. This could enable an attacker to perform unauthorized actions by circumventing intended security restrictions.
7.1 (High)
Affected products
Fixed
121 products, the same list as for
CVE-2023-53781
Threats
Impact
Moderate
A flaw was found in the Linux kernel's Transparent Inter-Process Communication (TIPC) module. This vulnerability, a double-free, occurs when the `tipc_buf_append()` function incorrectly handles memory after a socket buffer (skb) reallocation. An attacker could potentially exploit this to cause system instability or a denial of service. In some scenarios, this type of memory corruption could also lead to arbitrary code execution.
7.0 (High)
Affected products
Fixed
121 products, the same list as for
CVE-2023-53781
Threats
Impact
Important
A flaw was found in the Linux kernel's netfilter conntrack module. This vulnerability arises from the use of `sprintf` and insufficient buffer sizing in the `mangle_content_len()` function, which can lead to a stack-out-of-bounds write. An attacker could potentially exploit this memory corruption issue to cause a denial of service or other unspecified impacts.
7.0 (High)
Affected products
Fixed
121 products, the same list as for
CVE-2023-53781
Threats
Impact
Important
A flaw was found in the Linux kernel's iSCSI (Internet Small Computer System Interface) target functionality. This vulnerability, a heap overrun, occurs because the iscsi_encode_text_output() function does not properly check buffer capacity when processing login requests. A remote attacker could exploit this by sending a specially crafted login request with numerous key-value pairs, leading to a memory corruption issue and potentially a denial of service (DoS) on the system.
7.0 (High)
Affected products
Fixed
121 products, the same list as for
CVE-2023-53781
Threats
Impact
Important
A flaw was found in the Linux kernel's iSCSI (Internet Small Computer System Interface) target subsystem. This vulnerability involves a buffer overread and a double-free error when processing iSCSI Text commands. A remote attacker could exploit these issues by sending specially crafted network packets, leading to a kernel crash or memory corruption. This could result in a Denial of Service (DoS) for the affected system.
7.0 (High)
Affected products
Fixed
121 products, the same list as for
CVE-2023-53781
Threats
Impact
Important
A flaw was found in the Stream Control Transmission Protocol (SCTP) implementation within the Linux kernel. A remote attacker could send a specially crafted sequence of ASCONF (Add IP Address Configuration) chunks, including DEL-IP (Delete IP Address) parameters, to trigger a use-after-free condition. This memory corruption could lead to a system crash, resulting in a denial of service, and potentially allow for arbitrary code execution.
7.8 (High)
Affected products
Fixed
121 products, the same list as for
CVE-2023-53781
Threats
Impact
Important
References
45 references
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"text": "The kernel packages contain the Linux kernel, the core of any Linux operating system.\n\nSecurity Fix(es):\n\n* kernel: smc: Fix use-after-free in tcp_write_timer_handler() (CVE-2023-53781)\n\n* kernel: fanotify: fix false positive on permission events (CVE-2026-46150)\n\n* kernel: netfilter: conntrack: remove sprintf usage (CVE-2026-53002)\n\n* kernel: tipc: fix double-free in tipc_buf_append() (CVE-2026-52993)\n\n* kernel: scsi: target: iscsi: Fix CRC overread and double-free in iscsit_handle_text_cmd() (CVE-2026-63888)\n\n* kernel: scsi: target: iscsi: Bound iscsi_encode_text_output() appends to rsp_buf (CVE-2026-63887)\n\n* kernel: sctp: don\u0027t free the ASCONF\u0027s own transport in DEL-IP processing (CVE-2026-64564)\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.",
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"discovery_date": "2025-12-09T00:00:00+00:00",
"ids": [
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"text": "2420279"
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{
"category": "description",
"text": "In the Linux kernel, the following vulnerability has been resolved:\n\nsmc: Fix use-after-free in tcp_write_timer_handler().\n\nWith Eric\u0027s ref tracker, syzbot finally found a repro for\nuse-after-free in tcp_write_timer_handler() by kernel TCP\nsockets. [0]\n\nIf SMC creates a kernel socket in __smc_create(), the kernel\nsocket is supposed to be freed in smc_clcsock_release() by\ncalling sock_release() when we close() the parent SMC socket.\n\nHowever, at the end of smc_clcsock_release(), the kernel\nsocket\u0027s sk_state might not be TCP_CLOSE. This means that\nwe have not called inet_csk_destroy_sock() in __tcp_close()\nand have not stopped the TCP timers.\n\nThe kernel socket\u0027s TCP timers can be fired later, so we\nneed to hold a refcnt for net as we do for MPTCP subflows\nin mptcp_subflow_create_socket().\n\n[0]:\nleaked reference.\n sk_alloc (./include/net/net_namespace.h:335 net/core/sock.c:2108)\n inet_create (net/ipv4/af_inet.c:319 net/ipv4/af_inet.c:244)\n __sock_create (net/socket.c:1546)\n smc_create (net/smc/af_smc.c:3269 net/smc/af_smc.c:3284)\n __sock_create (net/socket.c:1546)\n __sys_socket (net/socket.c:1634 net/socket.c:1618 net/socket.c:1661)\n __x64_sys_socket (net/socket.c:1672)\n do_syscall_64 (arch/x86/entry/common.c:50 arch/x86/entry/common.c:80)\n entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:120)\n==================================================================\nBUG: KASAN: slab-use-after-free in tcp_write_timer_handler (net/ipv4/tcp_timer.c:378 net/ipv4/tcp_timer.c:624 net/ipv4/tcp_timer.c:594)\nRead of size 1 at addr ffff888052b65e0d by task syzrepro/18091\n\nCPU: 0 PID: 18091 Comm: syzrepro Tainted: G W 6.3.0-rc4-01174-gb5d54eb5899a #7\nHardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.16.0-1.amzn2022.0.1 04/01/2014\nCall Trace:\n \u003cIRQ\u003e\n dump_stack_lvl (lib/dump_stack.c:107)\n print_report (mm/kasan/report.c:320 mm/kasan/report.c:430)\n kasan_report (mm/kasan/report.c:538)\n tcp_write_timer_handler (net/ipv4/tcp_timer.c:378 net/ipv4/tcp_timer.c:624 net/ipv4/tcp_timer.c:594)\n tcp_write_timer (./include/linux/spinlock.h:390 net/ipv4/tcp_timer.c:643)\n call_timer_fn (./arch/x86/include/asm/jump_label.h:27 ./include/linux/jump_label.h:207 ./include/trace/events/timer.h:127 kernel/time/timer.c:1701)\n __run_timers.part.0 (kernel/time/timer.c:1752 kernel/time/timer.c:2022)\n run_timer_softirq (kernel/time/timer.c:2037)\n __do_softirq (./arch/x86/include/asm/jump_label.h:27 ./include/linux/jump_label.h:207 ./include/trace/events/irq.h:142 kernel/softirq.c:572)\n __irq_exit_rcu (kernel/softirq.c:445 kernel/softirq.c:650)\n irq_exit_rcu (kernel/softirq.c:664)\n sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1107 (discriminator 14))\n \u003c/IRQ\u003e",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "kernel: smc: Fix use-after-free in tcp_write_timer_handler()",
"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"
}
],
"product_status": {
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]
},
"references": [
{
"category": "self",
"summary": "Canonical URL",
"url": "https://access.redhat.com/security/cve/CVE-2023-53781"
},
{
"category": "external",
"summary": "RHBZ#2420279",
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2420279"
},
{
"category": "external",
"summary": "https://www.cve.org/CVERecord?id=CVE-2023-53781",
"url": "https://www.cve.org/CVERecord?id=CVE-2023-53781"
},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2023-53781",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2023-53781"
},
{
"category": "external",
"summary": "https://lore.kernel.org/linux-cve-announce/2025120939-CVE-2023-53781-cb1d@gregkh/T",
"url": "https://lore.kernel.org/linux-cve-announce/2025120939-CVE-2023-53781-cb1d@gregkh/T"
}
],
"release_date": "2025-12-09T00:00:00+00:00",
"remediations": [
{
"category": "vendor_fix",
"date": "2026-09-22T08:07:16+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.\n\nRed Hat recommends treating all kernel errata as security-relevant. Given the kernel\u0027s fundamental role, any bug has a higher chance of impacting system security, even if that impact only becomes clear after a fix is published. Therefore, Red Hat prioritizes delivering fixes that improve our customers\u0027 overall security posture.\n\nBecause of this proactive approach, a patch may be associated with a CVE assignment at a future date. Retroactive CVE assignments are always documented in the corresponding errata and on Red Hat\u0027s CVE pages. We strongly advise against delaying updates, as doing so may leave your system exposed when protections are already available.",
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],
"restart_required": {
"category": "machine"
},
"url": "https://access.redhat.com/errata/RHSA-2026:69874"
}
],
"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: smc: Fix use-after-free in tcp_write_timer_handler()"
},
{
"cve": "CVE-2026-46150",
"cwe": {
"id": "CWE-280",
"name": "Improper Handling of Insufficient Permissions or Privileges"
},
"discovery_date": "2026-05-28T00:00:00+00:00",
"ids": [
{
"system_name": "Red Hat Bugzilla ID",
"text": "2482612"
}
],
"notes": [
{
"category": "description",
"text": "A flaw was found in the Linux kernel\u0027s fanotify subsystem. This vulnerability allows for a bypass of permission checks because the `fsnotify_get_mark_safe()` function may incorrectly return false for marks on unrelated groups. This could enable an attacker to perform unauthorized actions by circumventing intended security restrictions.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "kernel: fanotify: fix false positive on permission events",
"title": "Vulnerability summary"
},
{
"category": "other",
"text": "This Moderate severity flaw in the Linux kernel\u0027s fanotify subsystem allows a local attacker to bypass security restrictions. An incorrect return value from `fsnotify_get_mark_safe()` can lead to unauthorized actions on Red Hat Enterprise Linux systems.",
"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"
}
],
"product_status": {
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},
"references": [
{
"category": "self",
"summary": "Canonical URL",
"url": "https://access.redhat.com/security/cve/CVE-2026-46150"
},
{
"category": "external",
"summary": "RHBZ#2482612",
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2482612"
},
{
"category": "external",
"summary": "https://www.cve.org/CVERecord?id=CVE-2026-46150",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-46150"
},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2026-46150",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-46150"
},
{
"category": "external",
"summary": "https://lore.kernel.org/linux-cve-announce/2026052822-CVE-2026-46150-c96d@gregkh/T",
"url": "https://lore.kernel.org/linux-cve-announce/2026052822-CVE-2026-46150-c96d@gregkh/T"
}
],
"release_date": "2026-05-28T00:00:00+00:00",
"remediations": [
{
"category": "vendor_fix",
"date": "2026-09-22T08:07:16+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.\n\nRed Hat recommends treating all kernel errata as security-relevant. Given the kernel\u0027s fundamental role, any bug has a higher chance of impacting system security, even if that impact only becomes clear after a fix is published. Therefore, Red Hat prioritizes delivering fixes that improve our customers\u0027 overall security posture.\n\nBecause of this proactive approach, a patch may be associated with a CVE assignment at a future date. Retroactive CVE assignments are always documented in the corresponding errata and on Red Hat\u0027s CVE pages. We strongly advise against delaying updates, as doing so may leave your system exposed when protections are already available.",
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"restart_required": {
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},
"url": "https://access.redhat.com/errata/RHSA-2026:69874"
}
],
"scores": [
{
"cvss_v3": {
"attackComplexity": "LOW",
"attackVector": "LOCAL",
"availabilityImpact": "HIGH",
"baseScore": 7.1,
"baseSeverity": "HIGH",
"confidentialityImpact": "HIGH",
"integrityImpact": "NONE",
"privilegesRequired": "LOW",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H",
"version": "3.1"
},
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],
"threats": [
{
"category": "impact",
"details": "Moderate"
}
],
"title": "kernel: fanotify: fix false positive on permission events"
},
{
"cve": "CVE-2026-52993",
"cwe": {
"id": "CWE-763",
"name": "Release of Invalid Pointer or Reference"
},
"discovery_date": "2026-06-24T00:00:00+00:00",
"ids": [
{
"system_name": "Red Hat Bugzilla ID",
"text": "2492437"
}
],
"notes": [
{
"category": "description",
"text": "A flaw was found in the Linux kernel\u0027s Transparent Inter-Process Communication (TIPC) module. This vulnerability, a double-free, occurs when the `tipc_buf_append()` function incorrectly handles memory after a socket buffer (skb) reallocation. An attacker could potentially exploit this to cause system instability or a denial of service. In some scenarios, this type of memory corruption could also lead to arbitrary code execution.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "kernel: tipc: fix double-free in tipc_buf_append()",
"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"
}
],
"product_status": {
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]
},
"references": [
{
"category": "self",
"summary": "Canonical URL",
"url": "https://access.redhat.com/security/cve/CVE-2026-52993"
},
{
"category": "external",
"summary": "RHBZ#2492437",
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2492437"
},
{
"category": "external",
"summary": "https://www.cve.org/CVERecord?id=CVE-2026-52993",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-52993"
},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2026-52993",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-52993"
},
{
"category": "external",
"summary": "https://lore.kernel.org/linux-cve-announce/2026062445-CVE-2026-52993-34a2@gregkh/T",
"url": "https://lore.kernel.org/linux-cve-announce/2026062445-CVE-2026-52993-34a2@gregkh/T"
}
],
"release_date": "2026-06-24T00:00:00+00:00",
"remediations": [
{
"category": "vendor_fix",
"date": "2026-09-22T08:07:16+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.\n\nRed Hat recommends treating all kernel errata as security-relevant. Given the kernel\u0027s fundamental role, any bug has a higher chance of impacting system security, even if that impact only becomes clear after a fix is published. Therefore, Red Hat prioritizes delivering fixes that improve our customers\u0027 overall security posture.\n\nBecause of this proactive approach, a patch may be associated with a CVE assignment at a future date. Retroactive CVE assignments are always documented in the corresponding errata and on Red Hat\u0027s CVE pages. We strongly advise against delaying updates, as doing so may leave your system exposed when protections are already available.",
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],
"restart_required": {
"category": "machine"
},
"url": "https://access.redhat.com/errata/RHSA-2026:69874"
}
],
"scores": [
{
"cvss_v3": {
"attackComplexity": "HIGH",
"attackVector": "LOCAL",
"availabilityImpact": "HIGH",
"baseScore": 7.0,
"baseSeverity": "HIGH",
"confidentialityImpact": "HIGH",
"integrityImpact": "HIGH",
"privilegesRequired": "LOW",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H",
"version": "3.1"
},
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]
}
],
"threats": [
{
"category": "impact",
"details": "Important"
}
],
"title": "kernel: tipc: fix double-free in tipc_buf_append()"
},
{
"cve": "CVE-2026-53002",
"cwe": {
"id": "CWE-787",
"name": "Out-of-bounds Write"
},
"discovery_date": "2026-06-24T00:00:00+00:00",
"ids": [
{
"system_name": "Red Hat Bugzilla ID",
"text": "2492329"
}
],
"notes": [
{
"category": "description",
"text": "A flaw was found in the Linux kernel\u0027s netfilter conntrack module. This vulnerability arises from the use of `sprintf` and insufficient buffer sizing in the `mangle_content_len()` function, which can lead to a stack-out-of-bounds write. An attacker could potentially exploit this memory corruption issue to cause a denial of service or other unspecified impacts.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "kernel: netfilter: conntrack: remove sprintf usage",
"title": "Vulnerability summary"
},
{
"category": "other",
"text": "An Important flaw was found in the Linux kernel\u0027s netfilter conntrack helper for SIP. A local attacker with low privileges could trigger a stack-out-of-bounds write by sending specially crafted SIP messages, potentially leading to a denial of service or privilege escalation. This vulnerability requires the system to process SIP traffic through netfilter.",
"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"
}
],
"product_status": {
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},
"references": [
{
"category": "self",
"summary": "Canonical URL",
"url": "https://access.redhat.com/security/cve/CVE-2026-53002"
},
{
"category": "external",
"summary": "RHBZ#2492329",
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2492329"
},
{
"category": "external",
"summary": "https://www.cve.org/CVERecord?id=CVE-2026-53002",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-53002"
},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2026-53002",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-53002"
},
{
"category": "external",
"summary": "https://lore.kernel.org/linux-cve-announce/2026062447-CVE-2026-53002-8577@gregkh/T",
"url": "https://lore.kernel.org/linux-cve-announce/2026062447-CVE-2026-53002-8577@gregkh/T"
}
],
"release_date": "2026-06-24T00:00:00+00:00",
"remediations": [
{
"category": "vendor_fix",
"date": "2026-09-22T08:07:16+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.\n\nRed Hat recommends treating all kernel errata as security-relevant. Given the kernel\u0027s fundamental role, any bug has a higher chance of impacting system security, even if that impact only becomes clear after a fix is published. Therefore, Red Hat prioritizes delivering fixes that improve our customers\u0027 overall security posture.\n\nBecause of this proactive approach, a patch may be associated with a CVE assignment at a future date. Retroactive CVE assignments are always documented in the corresponding errata and on Red Hat\u0027s CVE pages. We strongly advise against delaying updates, as doing so may leave your system exposed when protections are already available.",
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},
"url": "https://access.redhat.com/errata/RHSA-2026:69874"
},
{
"category": "workaround",
"details": "To mitigate this issue, prevent the nf_conntrack_sip and nf_nat_sip modules from being loaded. See https://access.redhat.com/solutions/41278 for instructions.",
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}
],
"scores": [
{
"cvss_v3": {
"attackComplexity": "HIGH",
"attackVector": "LOCAL",
"availabilityImpact": "HIGH",
"baseScore": 7.0,
"baseSeverity": "HIGH",
"confidentialityImpact": "HIGH",
"integrityImpact": "HIGH",
"privilegesRequired": "LOW",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H",
"version": "3.1"
},
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]
}
],
"threats": [
{
"category": "impact",
"details": "Important"
}
],
"title": "kernel: netfilter: conntrack: remove sprintf usage"
},
{
"cve": "CVE-2026-63887",
"cwe": {
"id": "CWE-120",
"name": "Buffer Copy without Checking Size of Input (\u0027Classic Buffer Overflow\u0027)"
},
"discovery_date": "2026-07-19T00:00:00+00:00",
"ids": [
{
"system_name": "Red Hat Bugzilla ID",
"text": "2502447"
}
],
"notes": [
{
"category": "description",
"text": "A flaw was found in the Linux kernel\u0027s iSCSI (Internet Small Computer System Interface) target functionality. This vulnerability, a heap overrun, occurs because the iscsi_encode_text_output() function does not properly check buffer capacity when processing login requests. A remote attacker could exploit this by sending a specially crafted login request with numerous key-value pairs, leading to a memory corruption issue and potentially a denial of service (DoS) on the system.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "kernel: scsi: target: iscsi: Bound iscsi_encode_text_output() appends to rsp_buf",
"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"
}
],
"product_status": {
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]
},
"references": [
{
"category": "self",
"summary": "Canonical URL",
"url": "https://access.redhat.com/security/cve/CVE-2026-63887"
},
{
"category": "external",
"summary": "RHBZ#2502447",
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2502447"
},
{
"category": "external",
"summary": "https://www.cve.org/CVERecord?id=CVE-2026-63887",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-63887"
},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2026-63887",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-63887"
},
{
"category": "external",
"summary": "https://lore.kernel.org/linux-cve-announce/2026071940-CVE-2026-63887-cf4b@gregkh/T",
"url": "https://lore.kernel.org/linux-cve-announce/2026071940-CVE-2026-63887-cf4b@gregkh/T"
}
],
"release_date": "2026-07-19T00:00:00+00:00",
"remediations": [
{
"category": "vendor_fix",
"date": "2026-09-22T08:07:16+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.\n\nRed Hat recommends treating all kernel errata as security-relevant. Given the kernel\u0027s fundamental role, any bug has a higher chance of impacting system security, even if that impact only becomes clear after a fix is published. Therefore, Red Hat prioritizes delivering fixes that improve our customers\u0027 overall security posture.\n\nBecause of this proactive approach, a patch may be associated with a CVE assignment at a future date. Retroactive CVE assignments are always documented in the corresponding errata and on Red Hat\u0027s CVE pages. We strongly advise against delaying updates, as doing so may leave your system exposed when protections are already available.",
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"restart_required": {
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},
"url": "https://access.redhat.com/errata/RHSA-2026:69874"
}
],
"scores": [
{
"cvss_v3": {
"attackComplexity": "HIGH",
"attackVector": "LOCAL",
"availabilityImpact": "HIGH",
"baseScore": 7.0,
"baseSeverity": "HIGH",
"confidentialityImpact": "HIGH",
"integrityImpact": "HIGH",
"privilegesRequired": "LOW",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H",
"version": "3.1"
},
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],
"threats": [
{
"category": "impact",
"details": "Important"
}
],
"title": "kernel: scsi: target: iscsi: Bound iscsi_encode_text_output() appends to rsp_buf"
},
{
"cve": "CVE-2026-63888",
"cwe": {
"id": "CWE-125",
"name": "Out-of-bounds Read"
},
"discovery_date": "2026-07-19T00:00:00+00:00",
"ids": [
{
"system_name": "Red Hat Bugzilla ID",
"text": "2502443"
}
],
"notes": [
{
"category": "description",
"text": "A flaw was found in the Linux kernel\u0027s iSCSI (Internet Small Computer System Interface) target subsystem. This vulnerability involves a buffer overread and a double-free error when processing iSCSI Text commands. A remote attacker could exploit these issues by sending specially crafted network packets, leading to a kernel crash or memory corruption. This could result in a Denial of Service (DoS) for the affected system.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "kernel: scsi: target: iscsi: Fix CRC overread and double-free in iscsit_handle_text_cmd()",
"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"
}
],
"product_status": {
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]
},
"references": [
{
"category": "self",
"summary": "Canonical URL",
"url": "https://access.redhat.com/security/cve/CVE-2026-63888"
},
{
"category": "external",
"summary": "RHBZ#2502443",
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2502443"
},
{
"category": "external",
"summary": "https://www.cve.org/CVERecord?id=CVE-2026-63888",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-63888"
},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2026-63888",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-63888"
},
{
"category": "external",
"summary": "https://lore.kernel.org/linux-cve-announce/2026071940-CVE-2026-63888-a5d6@gregkh/T",
"url": "https://lore.kernel.org/linux-cve-announce/2026071940-CVE-2026-63888-a5d6@gregkh/T"
}
],
"release_date": "2026-07-19T00:00:00+00:00",
"remediations": [
{
"category": "vendor_fix",
"date": "2026-09-22T08:07:16+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.\n\nRed Hat recommends treating all kernel errata as security-relevant. Given the kernel\u0027s fundamental role, any bug has a higher chance of impacting system security, even if that impact only becomes clear after a fix is published. Therefore, Red Hat prioritizes delivering fixes that improve our customers\u0027 overall security posture.\n\nBecause of this proactive approach, a patch may be associated with a CVE assignment at a future date. Retroactive CVE assignments are always documented in the corresponding errata and on Red Hat\u0027s CVE pages. We strongly advise against delaying updates, as doing so may leave your system exposed when protections are already available.",
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],
"restart_required": {
"category": "machine"
},
"url": "https://access.redhat.com/errata/RHSA-2026:69874"
}
],
"scores": [
{
"cvss_v3": {
"attackComplexity": "HIGH",
"attackVector": "LOCAL",
"availabilityImpact": "HIGH",
"baseScore": 7.0,
"baseSeverity": "HIGH",
"confidentialityImpact": "HIGH",
"integrityImpact": "HIGH",
"privilegesRequired": "LOW",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H",
"version": "3.1"
},
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}
],
"threats": [
{
"category": "impact",
"details": "Important"
}
],
"title": "kernel: scsi: target: iscsi: Fix CRC overread and double-free in iscsit_handle_text_cmd()"
},
{
"cve": "CVE-2026-64564",
"cwe": {
"id": "CWE-825",
"name": "Expired Pointer Dereference"
},
"discovery_date": "2026-08-04T00:00:00+00:00",
"ids": [
{
"system_name": "Red Hat Bugzilla ID",
"text": "2510890"
}
],
"notes": [
{
"category": "description",
"text": "A flaw was found in the Stream Control Transmission Protocol (SCTP) implementation within the Linux kernel. A remote attacker could send a specially crafted sequence of ASCONF (Add IP Address Configuration) chunks, including DEL-IP (Delete IP Address) parameters, to trigger a use-after-free condition. This memory corruption could lead to a system crash, resulting in a denial of service, and potentially allow for arbitrary code execution.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "kernel: sctp: don\u0027t free the ASCONF\u0027s own transport in DEL-IP processing",
"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"
}
],
"product_status": {
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},
"references": [
{
"category": "self",
"summary": "Canonical URL",
"url": "https://access.redhat.com/security/cve/CVE-2026-64564"
},
{
"category": "external",
"summary": "RHBZ#2510890",
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2510890"
},
{
"category": "external",
"summary": "https://www.cve.org/CVERecord?id=CVE-2026-64564",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-64564"
},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2026-64564",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-64564"
},
{
"category": "external",
"summary": "https://lore.kernel.org/linux-cve-announce/2026080404-CVE-2026-64564-6762@gregkh/T",
"url": "https://lore.kernel.org/linux-cve-announce/2026080404-CVE-2026-64564-6762@gregkh/T"
}
],
"release_date": "2026-08-04T00:00:00+00:00",
"remediations": [
{
"category": "vendor_fix",
"date": "2026-09-22T08:07:16+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.\n\nRed Hat recommends treating all kernel errata as security-relevant. Given the kernel\u0027s fundamental role, any bug has a higher chance of impacting system security, even if that impact only becomes clear after a fix is published. Therefore, Red Hat prioritizes delivering fixes that improve our customers\u0027 overall security posture.\n\nBecause of this proactive approach, a patch may be associated with a CVE assignment at a future date. Retroactive CVE assignments are always documented in the corresponding errata and on Red Hat\u0027s CVE pages. We strongly advise against delaying updates, as doing so may leave your system exposed when protections are already available.",
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},
"url": "https://access.redhat.com/errata/RHSA-2026:69874"
},
{
"category": "workaround",
"details": "To mitigate this issue, prevent the `sctp` kernel module from loading. Create a file named `/etc/modprobe.d/disable-sctp.conf` with the following content:\n\n```\ninstall sctp /bin/true\nblacklist sctp\n```\n\nAfter creating the file, regenerate the initramfs and reboot the system for the changes to take effect. Applications or services that rely on the SCTP protocol cannot use this mitigation and should prioritize applying the fix.",
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}
],
"scores": [
{
"cvss_v3": {
"attackComplexity": "LOW",
"attackVector": "LOCAL",
"availabilityImpact": "HIGH",
"baseScore": 7.8,
"baseSeverity": "HIGH",
"confidentialityImpact": "HIGH",
"integrityImpact": "HIGH",
"privilegesRequired": "LOW",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
"version": "3.1"
},
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]
}
],
"threats": [
{
"category": "impact",
"details": "Important"
}
],
"title": "kernel: sctp: don\u0027t free the ASCONF\u0027s own transport in DEL-IP processing"
}
]
}
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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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