RHSA-2026:72467

Vulnerability from csaf_redhat - Published: 2026-09-28 12:09 - Updated: 2026-09-28 22:24
Summary
Red Hat Security Advisory: kernel-rt security update
Severity
Important
Notes
Topic: An update for kernel-rt is now available for Red Hat Enterprise Linux 8. 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-rt packages provide the Real Time Linux Kernel, which enables fine-tuning for systems with extremely high determinism requirements. Security Fix(es): * kernel: fbcon: Set fb_display[i]->mode to NULL when the mode is released (CVE-2025-40323) * kernel: ext4: fix e4b bitmap inconsistency reports (CVE-2026-45942) * kernel: drm/amdgpu/vcn3: Prevent OOB reads when parsing dec msg (CVE-2026-46230) * kernel: drm/amdgpu/vcn4: Prevent OOB reads when parsing IB (CVE-2026-46204) * kernel: drm/amdgpu/vcn4: Prevent OOB reads when parsing dec msg (CVE-2026-46199) * kernel: arm64: tlb: Flush walk cache when unsharing PMD tables (CVE-2026-63875) * kernel: net: mana: Fix TOCTOU double-fetch of hwc_msg_id from DMA buffer (CVE-2026-64034) * kernel: perf/core: Detach event groups during remove_on_exec (CVE-2026-64556) * kernel: Linux kernel: libceph stack out-of-bounds write via crafted OSDMap (CVE-2026-68159) * kernel: libceph: refresh auth->authorizer_buf{,_len} after authorizer update (CVE-2026-68156) * kernel: Linux kernel (libceph): Denial of Service due to malformed monitor maps (CVE-2026-68155) * kernel: drm/amdgpu: Fix context pstate override handling (CVE-2026-68273) * kernel: perf: Reject exited events as group leaders (CVE-2026-74753) 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.
CVE-2025-40323

A use-after-free vulnerability was identified in the Linux kernel framebuffer console (fbcon) subsystem. During framebuffer unregistration, the kernel freed the memory for a display mode but did not clear the corresponding fb_display[i]->mode pointer. Subsequent framebuffer ioctl operations could then dereference the stale pointer, resulting in a kernel oops or crash.

5.8 (Medium)
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:H
CWE-416 - Use After Free
Affected products
Product Identifier Version Remediation
Unresolved product id: NFV-8.10.0.Z.MAIN.EUS:kernel-rt-0:4.18.0-553.169.1.rt7.510.el8_10.src —
Vendor Fix fix
Workaround
Unresolved product id: NFV-8.10.0.Z.MAIN.EUS:kernel-rt-0:4.18.0-553.169.1.rt7.510.el8_10.x86_64 —
Vendor Fix fix
Workaround
Unresolved product id: NFV-8.10.0.Z.MAIN.EUS:kernel-rt-core-0:4.18.0-553.169.1.rt7.510.el8_10.x86_64 —
Vendor Fix fix
Workaround
Unresolved product id: NFV-8.10.0.Z.MAIN.EUS:kernel-rt-debug-0:4.18.0-553.169.1.rt7.510.el8_10.x86_64 —
Vendor Fix fix
Workaround
Unresolved product id: NFV-8.10.0.Z.MAIN.EUS:kernel-rt-debug-core-0:4.18.0-553.169.1.rt7.510.el8_10.x86_64 —
Vendor Fix fix
Workaround
Unresolved product id: NFV-8.10.0.Z.MAIN.EUS:kernel-rt-debug-debuginfo-0:4.18.0-553.169.1.rt7.510.el8_10.x86_64 —
Vendor Fix fix
Workaround
Unresolved product id: NFV-8.10.0.Z.MAIN.EUS:kernel-rt-debug-devel-0:4.18.0-553.169.1.rt7.510.el8_10.x86_64 —
Vendor Fix fix
Workaround
Unresolved product id: NFV-8.10.0.Z.MAIN.EUS:kernel-rt-debug-kvm-0:4.18.0-553.169.1.rt7.510.el8_10.x86_64 —
Vendor Fix fix
Workaround
Unresolved product id: NFV-8.10.0.Z.MAIN.EUS:kernel-rt-debug-modules-0:4.18.0-553.169.1.rt7.510.el8_10.x86_64 —
Vendor Fix fix
Workaround
Unresolved product id: NFV-8.10.0.Z.MAIN.EUS:kernel-rt-debug-modules-extra-0:4.18.0-553.169.1.rt7.510.el8_10.x86_64 —
Vendor Fix fix
Workaround
Unresolved product id: NFV-8.10.0.Z.MAIN.EUS:kernel-rt-debuginfo-0:4.18.0-553.169.1.rt7.510.el8_10.x86_64 —
Vendor Fix fix
Workaround
Unresolved product id: NFV-8.10.0.Z.MAIN.EUS:kernel-rt-debuginfo-common-x86_64-0:4.18.0-553.169.1.rt7.510.el8_10.x86_64 —
Vendor Fix fix
Workaround
Unresolved product id: NFV-8.10.0.Z.MAIN.EUS:kernel-rt-devel-0:4.18.0-553.169.1.rt7.510.el8_10.x86_64 —
Vendor Fix fix
Workaround
Unresolved product id: NFV-8.10.0.Z.MAIN.EUS:kernel-rt-kvm-0:4.18.0-553.169.1.rt7.510.el8_10.x86_64 —
Vendor Fix fix
Workaround
Unresolved product id: NFV-8.10.0.Z.MAIN.EUS:kernel-rt-modules-0:4.18.0-553.169.1.rt7.510.el8_10.x86_64 —
Vendor Fix fix
Workaround
Unresolved product id: NFV-8.10.0.Z.MAIN.EUS:kernel-rt-modules-extra-0:4.18.0-553.169.1.rt7.510.el8_10.x86_64 —
Vendor Fix fix
Workaround
Unresolved product id: RT-8.10.0.Z.MAIN.EUS:kernel-rt-0:4.18.0-553.169.1.rt7.510.el8_10.src —
Vendor Fix fix
Workaround
Unresolved product id: RT-8.10.0.Z.MAIN.EUS:kernel-rt-0:4.18.0-553.169.1.rt7.510.el8_10.x86_64 —
Vendor Fix fix
Workaround
Unresolved product id: RT-8.10.0.Z.MAIN.EUS:kernel-rt-core-0:4.18.0-553.169.1.rt7.510.el8_10.x86_64 —
Vendor Fix fix
Workaround
Unresolved product id: RT-8.10.0.Z.MAIN.EUS:kernel-rt-debug-0:4.18.0-553.169.1.rt7.510.el8_10.x86_64 —
Vendor Fix fix
Workaround
Unresolved product id: RT-8.10.0.Z.MAIN.EUS:kernel-rt-debug-core-0:4.18.0-553.169.1.rt7.510.el8_10.x86_64 —
Vendor Fix fix
Workaround
Unresolved product id: RT-8.10.0.Z.MAIN.EUS:kernel-rt-debug-debuginfo-0:4.18.0-553.169.1.rt7.510.el8_10.x86_64 —
Vendor Fix fix
Workaround
Unresolved product id: RT-8.10.0.Z.MAIN.EUS:kernel-rt-debug-devel-0:4.18.0-553.169.1.rt7.510.el8_10.x86_64 —
Vendor Fix fix
Workaround
Unresolved product id: RT-8.10.0.Z.MAIN.EUS:kernel-rt-debug-modules-0:4.18.0-553.169.1.rt7.510.el8_10.x86_64 —
Vendor Fix fix
Workaround
Unresolved product id: RT-8.10.0.Z.MAIN.EUS:kernel-rt-debug-modules-extra-0:4.18.0-553.169.1.rt7.510.el8_10.x86_64 —
Vendor Fix fix
Workaround
Unresolved product id: RT-8.10.0.Z.MAIN.EUS:kernel-rt-debuginfo-0:4.18.0-553.169.1.rt7.510.el8_10.x86_64 —
Vendor Fix fix
Workaround
Unresolved product id: RT-8.10.0.Z.MAIN.EUS:kernel-rt-debuginfo-common-x86_64-0:4.18.0-553.169.1.rt7.510.el8_10.x86_64 —
Vendor Fix fix
Workaround
Unresolved product id: RT-8.10.0.Z.MAIN.EUS:kernel-rt-devel-0:4.18.0-553.169.1.rt7.510.el8_10.x86_64 —
Vendor Fix fix
Workaround
Unresolved product id: RT-8.10.0.Z.MAIN.EUS:kernel-rt-modules-0:4.18.0-553.169.1.rt7.510.el8_10.x86_64 —
Vendor Fix fix
Workaround
Unresolved product id: RT-8.10.0.Z.MAIN.EUS:kernel-rt-modules-extra-0:4.18.0-553.169.1.rt7.510.el8_10.x86_64 —
Vendor Fix fix
Workaround
Threats
Impact Moderate
CVE-2026-45942

A flaw was found in the Linux kernel's ext4 filesystem. A race condition exists between page migration and bitmap modification within the `load_buddy` function. This can lead to bitmap inconsistencies and false positive corruption reports during certain workloads. This issue can affect data integrity reporting and system stability.

7.0 (High)
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
CWE-367 - Time-of-check Time-of-use (TOCTOU) Race Condition
Affected products
Fixed 30 products, the same list as for CVE-2025-40323
Threats
Impact Moderate
CVE-2026-46199

A flaw was found in the Linux kernel's `drm/amdgpu/vcn4` component. This vulnerability allows an attacker to trigger an out-of-bounds (OOB) read when parsing decoder messages due to insufficient bounds checking. This could lead to information disclosure, potentially revealing sensitive data from memory.

7.0 (High)
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
CWE-125 - Out-of-bounds Read
Affected products
Fixed 30 products, the same list as for CVE-2025-40323
Threats
Impact Moderate
CVE-2026-46204

A flaw was found in the Linux kernel's AMD GPU (Graphics Processing Unit) driver, specifically within the `drm/amdgpu/vcn4` component. This vulnerability allows for an out-of-bounds read when processing an Instruction Buffer (IB). An attacker could potentially exploit this to read sensitive information from memory or cause system instability.

7.0 (High)
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
CWE-125 - Out-of-bounds Read
Affected products
Fixed 30 products, the same list as for CVE-2025-40323
Threats
Impact Moderate
CVE-2026-46230

A flaw was found in the Linux kernel's `drm/amdgpu/vcn3` component. This vulnerability, an Out-of-Bounds (OOB) read, occurs when parsing decoder messages without proper boundary checks. A local attacker could potentially exploit this to read sensitive information from memory or cause system instability, leading to a denial of service.

7.0 (High)
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
CWE-125 - Out-of-bounds Read
Affected products
Fixed 30 products, the same list as for CVE-2025-40323
Threats
Impact Moderate
CVE-2026-63875

A flaw was found in the Linux kernel, specifically within the arm64 architecture's Translation Lookaside Buffer (TLB) management. When a Page Middle Directory (PMD) table was unshared, the TLB flush operation did not correctly invalidate entries in the walk cache. This oversight could leave stale PMD page table entries, potentially leading to incorrect page table walks. Such an issue can enable an attacker to access unauthorized memory regions, potentially resulting in information disclosure or privilege escalation.

7.0 (High)
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
CWE-825 - Expired Pointer Dereference
Affected products
Fixed 30 products, the same list as for CVE-2025-40323
Threats
Impact Important
CVE-2026-64034

A flaw was found in the Linux kernel's mana network driver. This Time-of-Check to Time-of-Use (TOCTOU) vulnerability allows a hardware component to modify a message identifier (hwc_msg_id) in Direct Memory Access (DMA) memory after it has been validated but before it is used. This manipulation bypasses critical bounds validation, potentially leading to unexpected system behavior or security bypasses, particularly in Confidential Virtual Machines (CVMs) where DMA memory is shared and unencrypted.

7.0 (High)
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
CWE-367 - Time-of-check Time-of-use (TOCTOU) Race Condition
Affected products
Fixed 30 products, the same list as for CVE-2025-40323
Threats
Impact Important
CVE-2026-64556

A flaw was found in the Linux kernel's performance monitoring unit (PMU) subsystem. This vulnerability occurs when a performance event group leader is removed during process execution, but its associated events (siblings) remain active and linked to a stale list. This inconsistent state can lead to a corruption of the PMU context active list, potentially causing system instability or a denial of service. A local attacker could potentially exploit this to disrupt system operations.

7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CWE-663 - Use of a Non-reentrant Function in a Concurrent Context
Affected products
Fixed 30 products, the same list as for CVE-2025-40323
Threats
Impact Important
CVE-2026-68155

A flaw was found in the libceph component of the Linux kernel. A remote attacker could send a specially crafted monitor map (monmap) that advertises zero monitors. This malformed monmap is incorrectly processed as valid, which can lead to a client crash when attempting to open a session. This vulnerability results in a Denial of Service (DoS) for the client.

7.1 (High)
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:H
CWE-617 - Reachable Assertion
Affected products
Fixed 30 products, the same list as for CVE-2025-40323
Threats
Impact Moderate
CVE-2026-68156

A flaw was found in the `libceph` component of the Linux kernel. During an authorizer update, if the authorizer is rebuilt, a stale pointer to a freed memory region can be retained. A remote attacker could exploit this by triggering a specific network reconnection, leading to a use-after-free vulnerability. This memory corruption could result in a system crash or denial of service.

8.8 (High)
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CWE-825 - Expired Pointer Dereference
Affected products
Fixed 30 products, the same list as for CVE-2025-40323
Threats
Impact Important
CVE-2026-68159

A flaw was found in libceph in the Linux kernel. A remote attacker, acting as a malicious monitor, could send a specially crafted OSDMap (Object Storage Device Map) with an overly long pg_temp or pg_upmap entry. This could lead to a stack out-of-bounds write, resulting in a kernel bug and potentially a denial of service.

8.8 (High)
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CWE-787 - Out-of-bounds Write
Affected products
Fixed 30 products, the same list as for CVE-2025-40323
Threats
Impact Important
CVE-2026-68273

A flaw was found in the Linux kernel's amdgpu graphics driver. Improper handling of context pstate overrides can lead to use-after-free and NULL pointer dereferences during context initialization and finalization. A local attacker could exploit this vulnerability to cause system instability or a denial of service (DoS).

7.0 (High)
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
CWE-476 - NULL Pointer Dereference
Affected products
Fixed 30 products, the same list as for CVE-2025-40323
Threats
Impact Moderate
CVE-2026-74753

A flaw was found in the Linux kernel's performance monitoring (perf) subsystem. This vulnerability allows a local attacker to trigger a use-after-free condition by improperly handling exited events as group leaders. Successful exploitation could lead to a system crash, resulting in a denial of service (DoS), or potentially enable an attacker to escalate privileges.

7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CWE-825 - Expired Pointer Dereference
Affected products
Fixed 30 products, the same list as for CVE-2025-40323
Threats
Impact Important
References
URL Category
https://access.redhat.com/errata/RHSA-2026:72467 self
https://access.redhat.com/security/updates/classi… external
https://bugzilla.redhat.com/show_bug.cgi?id=2419883 external
https://bugzilla.redhat.com/show_bug.cgi?id=2482104 external
https://bugzilla.redhat.com/show_bug.cgi?id=2482533 external
https://bugzilla.redhat.com/show_bug.cgi?id=2482543 external
https://bugzilla.redhat.com/show_bug.cgi?id=2482649 external
https://bugzilla.redhat.com/show_bug.cgi?id=2502318 external
https://bugzilla.redhat.com/show_bug.cgi?id=2502394 external
https://bugzilla.redhat.com/show_bug.cgi?id=2508319 external
https://bugzilla.redhat.com/show_bug.cgi?id=2513165 external
https://bugzilla.redhat.com/show_bug.cgi?id=2513232 external
https://bugzilla.redhat.com/show_bug.cgi?id=2513295 external
https://bugzilla.redhat.com/show_bug.cgi?id=2513434 external
https://bugzilla.redhat.com/show_bug.cgi?id=2524434 external
https://security.access.redhat.com/data/csaf/v2/a… self
https://access.redhat.com/security/cve/CVE-2025-40323 self
https://bugzilla.redhat.com/show_bug.cgi?id=2419883 external
https://www.cve.org/CVERecord?id=CVE-2025-40323 external
https://nvd.nist.gov/vuln/detail/CVE-2025-40323 external
https://lore.kernel.org/linux-cve-announce/202512… external
https://access.redhat.com/security/cve/CVE-2026-45942 self
https://bugzilla.redhat.com/show_bug.cgi?id=2482104 external
https://www.cve.org/CVERecord?id=CVE-2026-45942 external
https://nvd.nist.gov/vuln/detail/CVE-2026-45942 external
https://lore.kernel.org/linux-cve-announce/202605… external
https://access.redhat.com/security/cve/CVE-2026-46199 self
https://bugzilla.redhat.com/show_bug.cgi?id=2482649 external
https://www.cve.org/CVERecord?id=CVE-2026-46199 external
https://nvd.nist.gov/vuln/detail/CVE-2026-46199 external
https://lore.kernel.org/linux-cve-announce/202605… external
https://access.redhat.com/security/cve/CVE-2026-46204 self
https://bugzilla.redhat.com/show_bug.cgi?id=2482543 external
https://www.cve.org/CVERecord?id=CVE-2026-46204 external
https://nvd.nist.gov/vuln/detail/CVE-2026-46204 external
https://lore.kernel.org/linux-cve-announce/202605… external
https://access.redhat.com/security/cve/CVE-2026-46230 self
https://bugzilla.redhat.com/show_bug.cgi?id=2482533 external
https://www.cve.org/CVERecord?id=CVE-2026-46230 external
https://nvd.nist.gov/vuln/detail/CVE-2026-46230 external
https://lore.kernel.org/linux-cve-announce/202605… external
https://access.redhat.com/security/cve/CVE-2026-63875 self
https://bugzilla.redhat.com/show_bug.cgi?id=2502318 external
https://www.cve.org/CVERecord?id=CVE-2026-63875 external
https://nvd.nist.gov/vuln/detail/CVE-2026-63875 external
https://lore.kernel.org/linux-cve-announce/202607… external
https://access.redhat.com/security/cve/CVE-2026-64034 self
https://bugzilla.redhat.com/show_bug.cgi?id=2502394 external
https://www.cve.org/CVERecord?id=CVE-2026-64034 external
https://nvd.nist.gov/vuln/detail/CVE-2026-64034 external
https://lore.kernel.org/linux-cve-announce/202607… external
https://access.redhat.com/security/cve/CVE-2026-64556 self
https://bugzilla.redhat.com/show_bug.cgi?id=2508319 external
https://www.cve.org/CVERecord?id=CVE-2026-64556 external
https://nvd.nist.gov/vuln/detail/CVE-2026-64556 external
https://lore.kernel.org/linux-cve-announce/202607… external
https://access.redhat.com/security/cve/CVE-2026-68155 self
https://bugzilla.redhat.com/show_bug.cgi?id=2513295 external
https://www.cve.org/CVERecord?id=CVE-2026-68155 external
https://nvd.nist.gov/vuln/detail/CVE-2026-68155 external
https://lore.kernel.org/linux-cve-announce/202608… external
https://access.redhat.com/security/cve/CVE-2026-68156 self
https://bugzilla.redhat.com/show_bug.cgi?id=2513232 external
https://www.cve.org/CVERecord?id=CVE-2026-68156 external
https://nvd.nist.gov/vuln/detail/CVE-2026-68156 external
https://lore.kernel.org/linux-cve-announce/202608… external
https://access.redhat.com/security/cve/CVE-2026-68159 self
https://bugzilla.redhat.com/show_bug.cgi?id=2513165 external
https://www.cve.org/CVERecord?id=CVE-2026-68159 external
https://nvd.nist.gov/vuln/detail/CVE-2026-68159 external
https://git.kernel.org/stable/c/9f00f9cf2be293efe… external
https://git.kernel.org/stable/c/e36663145abd7024f… external
https://access.redhat.com/security/cve/CVE-2026-68273 self
https://bugzilla.redhat.com/show_bug.cgi?id=2513434 external
https://www.cve.org/CVERecord?id=CVE-2026-68273 external
https://nvd.nist.gov/vuln/detail/CVE-2026-68273 external
https://lore.kernel.org/linux-cve-announce/202608… external
https://access.redhat.com/security/cve/CVE-2026-74753 self
https://bugzilla.redhat.com/show_bug.cgi?id=2524434 external
https://www.cve.org/CVERecord?id=CVE-2026-74753 external
https://nvd.nist.gov/vuln/detail/CVE-2026-74753 external
https://git.kernel.org/pub/scm/linux/security/vul… external
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    "category": "csaf_security_advisory",
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      {
        "category": "summary",
        "text": "An update for kernel-rt is now available for Red Hat Enterprise Linux 8.\n\nRed 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.",
        "title": "Topic"
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        "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: fbcon: Set fb_display[i]-\u003emode to NULL when the mode is released (CVE-2025-40323)\n\n* kernel: ext4: fix e4b bitmap inconsistency reports (CVE-2026-45942)\n\n* kernel: drm/amdgpu/vcn3: Prevent OOB reads when parsing dec msg (CVE-2026-46230)\n\n* kernel: drm/amdgpu/vcn4: Prevent OOB reads when parsing IB (CVE-2026-46204)\n\n* kernel: drm/amdgpu/vcn4: Prevent OOB reads when parsing dec msg (CVE-2026-46199)\n\n* kernel: arm64: tlb: Flush walk cache when unsharing PMD tables (CVE-2026-63875)\n\n* kernel: net: mana: Fix TOCTOU double-fetch of hwc_msg_id from DMA buffer (CVE-2026-64034)\n\n* kernel: perf/core: Detach event groups during remove_on_exec (CVE-2026-64556)\n\n* kernel: Linux kernel: libceph stack out-of-bounds write via crafted OSDMap (CVE-2026-68159)\n\n* kernel: libceph: refresh auth-\u003eauthorizer_buf{,_len} after authorizer update (CVE-2026-68156)\n\n* kernel: Linux kernel (libceph): Denial of Service due to malformed monitor maps (CVE-2026-68155)\n\n* kernel: drm/amdgpu: Fix context pstate override handling (CVE-2026-68273)\n\n* kernel: perf: Reject exited events as group leaders (CVE-2026-74753)\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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        "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.",
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      "title": "kernel: Linux kernel (libceph): Denial of Service due to malformed monitor maps"
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      "cve": "CVE-2026-68156",
      "cwe": {
        "id": "CWE-825",
        "name": "Expired Pointer Dereference"
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          "text": "A flaw was found in the `libceph` component of the Linux kernel. During an authorizer update, if the authorizer is rebuilt, a stale pointer to a freed memory region can be retained. A remote attacker could exploit this by triggering a specific network reconnection, leading to a use-after-free vulnerability. This memory corruption could result in a system crash or denial of service.",
          "title": "Vulnerability description"
        },
        {
          "category": "summary",
          "text": "kernel: libceph: refresh auth-\u003eauthorizer_buf{,_len} after authorizer update",
          "title": "Vulnerability summary"
        },
        {
          "category": "other",
          "text": "This use-after-free flaw in the Linux kernel\u0027s `libceph` module can be triggered during Ceph client reconnection. An attacker could exploit this by manipulating Ceph authentication, potentially leading to a system crash or privilege escalation. The impact is significant due to the kernel context, but requires specific Ceph client usage.",
          "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.",
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          "title": "Vulnerability summary"
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          "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.",
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          "title": "Vulnerability description"
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          "text": "kernel: perf: Reject exited events as group leaders",
          "title": "Vulnerability summary"
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        {
          "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.",
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          ]
        }
      ],
      "threats": [
        {
          "category": "impact",
          "details": "Important"
        }
      ],
      "title": "kernel: perf: Reject exited events as group leaders"
    }
  ]
}



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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.



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.