RHSA-2026:39984
Vulnerability from csaf_redhat - Published: 2026-07-15 13:47 - Updated: 2026-07-22 20:43Summary
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: rtmutex: Use waiter::task instead of current in remove_waiter() (CVE-2026-43499)
* kernel: futex/requeue: Prevent NULL pointer dereference in remove_waiter() on self-deadlock (CVE-2026-53166)
* kernel: XFS data corruption using reflink ()
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.
A flaw was found in the Linux kernel. When the kernel's real-time mutex (rtmutex) component performs a specific operation called 'proxy-lock rollback' during futex requeue, it incorrectly handles task pointers. This can lead to a 'Use-After-Free' (UAF) vulnerability, where the system attempts to use memory that has already been released. A local attacker could potentially exploit this to gain elevated privileges or execute unauthorized code.
7.8 (High)
Affected products
Fixed
50 products
| Product | Identifier | Version | Remediation |
|---|---|---|---|
| Unresolved product id: BaseOS-8.4.0.Z.AUS:bpftool-0:4.18.0-305.198.1.el8_4.x86_64 | — |
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| Unresolved product id: BaseOS-8.4.0.Z.AUS:bpftool-debuginfo-0:4.18.0-305.198.1.el8_4.x86_64 | — |
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| Unresolved product id: BaseOS-8.4.0.Z.AUS:kernel-0:4.18.0-305.198.1.el8_4.src | — |
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| Unresolved product id: BaseOS-8.4.0.Z.AUS:kernel-0:4.18.0-305.198.1.el8_4.x86_64 | — |
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| Unresolved product id: BaseOS-8.4.0.Z.AUS:kernel-abi-stablelists-0:4.18.0-305.198.1.el8_4.noarch | — |
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| Unresolved product id: BaseOS-8.4.0.Z.AUS:kernel-core-0:4.18.0-305.198.1.el8_4.x86_64 | — |
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| Unresolved product id: BaseOS-8.4.0.Z.AUS:kernel-debug-0:4.18.0-305.198.1.el8_4.x86_64 | — |
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| Unresolved product id: BaseOS-8.4.0.Z.AUS:kernel-debug-core-0:4.18.0-305.198.1.el8_4.x86_64 | — |
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| Unresolved product id: BaseOS-8.4.0.Z.AUS:kernel-debug-debuginfo-0:4.18.0-305.198.1.el8_4.x86_64 | — |
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| Unresolved product id: BaseOS-8.4.0.Z.AUS:kernel-debug-devel-0:4.18.0-305.198.1.el8_4.x86_64 | — |
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| Unresolved product id: BaseOS-8.4.0.Z.AUS:kernel-debug-modules-0:4.18.0-305.198.1.el8_4.x86_64 | — |
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| Unresolved product id: BaseOS-8.4.0.Z.AUS:kernel-debug-modules-extra-0:4.18.0-305.198.1.el8_4.x86_64 | — |
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| Unresolved product id: BaseOS-8.4.0.Z.AUS:kernel-debuginfo-0:4.18.0-305.198.1.el8_4.x86_64 | — |
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| Unresolved product id: BaseOS-8.4.0.Z.AUS:kernel-debuginfo-common-x86_64-0:4.18.0-305.198.1.el8_4.x86_64 | — |
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| Unresolved product id: BaseOS-8.4.0.Z.AUS:kernel-modules-0:4.18.0-305.198.1.el8_4.x86_64 | — |
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| Unresolved product id: BaseOS-8.4.0.Z.AUS:kernel-modules-extra-0:4.18.0-305.198.1.el8_4.x86_64 | — |
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| Unresolved product id: BaseOS-8.4.0.Z.AUS:kernel-tools-0:4.18.0-305.198.1.el8_4.x86_64 | — |
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| Unresolved product id: BaseOS-8.4.0.Z.AUS:kernel-tools-debuginfo-0:4.18.0-305.198.1.el8_4.x86_64 | — |
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| Unresolved product id: BaseOS-8.4.0.Z.AUS:kernel-tools-libs-0:4.18.0-305.198.1.el8_4.x86_64 | — |
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| Unresolved product id: BaseOS-8.4.0.Z.AUS:python3-perf-0:4.18.0-305.198.1.el8_4.x86_64 | — |
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| Unresolved product id: BaseOS-8.4.0.Z.AUS:python3-perf-debuginfo-0:4.18.0-305.198.1.el8_4.x86_64 | — |
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| Unresolved product id: BaseOS-8.4.0.Z.EUS.EXTENSION:bpftool-0:4.18.0-305.198.1.el8_4.x86_64 | — |
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| Unresolved product id: BaseOS-8.4.0.Z.EUS.EXTENSION:kernel-debug-modules-extra-0:4.18.0-305.198.1.el8_4.x86_64 | — |
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| Unresolved product id: BaseOS-8.4.0.Z.EUS.EXTENSION:kernel-debuginfo-common-x86_64-0:4.18.0-305.198.1.el8_4.x86_64 | — |
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| Unresolved product id: BaseOS-8.4.0.Z.EUS.EXTENSION:kernel-devel-0:4.18.0-305.198.1.el8_4.x86_64 | — |
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| Unresolved product id: BaseOS-8.4.0.Z.EUS.EXTENSION:kernel-modules-0:4.18.0-305.198.1.el8_4.x86_64 | — |
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| Unresolved product id: BaseOS-8.4.0.Z.EUS.EXTENSION:perf-debuginfo-0:4.18.0-305.198.1.el8_4.x86_64 | — |
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| Unresolved product id: BaseOS-8.4.0.Z.EUS.EXTENSION:python3-perf-0:4.18.0-305.198.1.el8_4.x86_64 | — |
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| Unresolved product id: BaseOS-8.4.0.Z.EUS.EXTENSION:python3-perf-debuginfo-0:4.18.0-305.198.1.el8_4.x86_64 | — |
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Threats
Impact
Important
A flaw was found in the Linux kernel's futex (Fast Userspace Mutex) requeue mechanism. When a non-top waiter attempts to requeue a Priority Inheritance (PI) futex it already owns, a NULL pointer dereference can occur. This issue, specifically within the `remove_waiter()` function during a self-deadlock scenario, leads to a kernel crash, resulting in a Denial of Service (DoS).
5.5 (Medium)
Affected products
Fixed
50 products
| Product | Identifier | Version | Remediation |
|---|---|---|---|
| Unresolved product id: BaseOS-8.4.0.Z.AUS:bpftool-0:4.18.0-305.198.1.el8_4.x86_64 | — |
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| Unresolved product id: BaseOS-8.4.0.Z.AUS:bpftool-debuginfo-0:4.18.0-305.198.1.el8_4.x86_64 | — |
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| Unresolved product id: BaseOS-8.4.0.Z.AUS:kernel-0:4.18.0-305.198.1.el8_4.src | — |
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| Unresolved product id: BaseOS-8.4.0.Z.AUS:kernel-0:4.18.0-305.198.1.el8_4.x86_64 | — |
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| Unresolved product id: BaseOS-8.4.0.Z.AUS:kernel-abi-stablelists-0:4.18.0-305.198.1.el8_4.noarch | — |
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| Unresolved product id: BaseOS-8.4.0.Z.AUS:kernel-core-0:4.18.0-305.198.1.el8_4.x86_64 | — |
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| Unresolved product id: BaseOS-8.4.0.Z.AUS:kernel-debug-0:4.18.0-305.198.1.el8_4.x86_64 | — |
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| Unresolved product id: BaseOS-8.4.0.Z.AUS:kernel-debug-core-0:4.18.0-305.198.1.el8_4.x86_64 | — |
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| Unresolved product id: BaseOS-8.4.0.Z.AUS:kernel-debug-debuginfo-0:4.18.0-305.198.1.el8_4.x86_64 | — |
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| Unresolved product id: BaseOS-8.4.0.Z.AUS:kernel-debug-devel-0:4.18.0-305.198.1.el8_4.x86_64 | — |
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| Unresolved product id: BaseOS-8.4.0.Z.AUS:kernel-debug-modules-0:4.18.0-305.198.1.el8_4.x86_64 | — |
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Threats
Impact
Moderate
A flaw was found in the XFS filesystem. A race condition in the copy-on-write mechanism for reflinked files can cause writes to bypass the copy-on-write process and modify shared data blocks directly. As a result, data intended for a private copy may be written to the original shared location, corrupting the contents of other files that reference those blocks. A local attacker with read access to a file on an XFS filesystem with reflink enabled could exploit this flaw to corrupt files they do not have write access to, allowing content to be added to the target file. If properly exploited this vulnerability may lead to privilege escalations or arbitrary code execution.
7.8 (High)
Affected products
Fixed
50 products
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Threats
Impact
Important
References
21 references
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"distribution": {
"text": "Copyright \u00a9 Red Hat, Inc. All rights reserved.",
"tlp": {
"label": "WHITE",
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"lang": "en",
"notes": [
{
"category": "summary",
"text": "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.\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"
},
{
"category": "general",
"text": "The kernel packages contain the Linux kernel, the core of any Linux operating system.\n\nSecurity Fix(es):\n\n* kernel: rtmutex: Use waiter::task instead of current in remove_waiter() (CVE-2026-43499)\n\n* kernel: futex/requeue: Prevent NULL pointer dereference in remove_waiter() on self-deadlock (CVE-2026-53166)\n\n* kernel: XFS data corruption using reflink ()\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"
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{
"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"
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"title": "Red Hat Security Advisory: kernel security update",
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"scope": "UNCHANGED",
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"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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{
"category": "impact",
"details": "Important"
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],
"title": "kernel: rtmutex: Use waiter::task instead of current in remove_waiter()"
},
{
"cve": "CVE-2026-53166",
"cwe": {
"id": "CWE-476",
"name": "NULL Pointer Dereference"
},
"discovery_date": "2026-06-25T00:00:00+00:00",
"ids": [
{
"system_name": "Red Hat Bugzilla ID",
"text": "2492805"
}
],
"notes": [
{
"category": "description",
"text": "A flaw was found in the Linux kernel\u0027s futex (Fast Userspace Mutex) requeue mechanism. When a non-top waiter attempts to requeue a Priority Inheritance (PI) futex it already owns, a NULL pointer dereference can occur. This issue, specifically within the `remove_waiter()` function during a self-deadlock scenario, leads to a kernel crash, resulting in a Denial of Service (DoS).",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "kernel: futex/requeue: Prevent NULL pointer dereference in remove_waiter() on self-deadlock",
"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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"references": [
{
"category": "self",
"summary": "Canonical URL",
"url": "https://access.redhat.com/security/cve/CVE-2026-53166"
},
{
"category": "external",
"summary": "RHBZ#2492805",
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2492805"
},
{
"category": "external",
"summary": "RHSB-2026-010",
"url": "https://access.redhat.com/security/vulnerabilities/RHSB-2026-010"
},
{
"category": "external",
"summary": "https://www.cve.org/CVERecord?id=CVE-2026-53166",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-53166"
},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2026-53166",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-53166"
},
{
"category": "external",
"summary": "https://lore.kernel.org/linux-cve-announce/2026062551-CVE-2026-53166-2861@gregkh/T",
"url": "https://lore.kernel.org/linux-cve-announce/2026062551-CVE-2026-53166-2861@gregkh/T"
}
],
"release_date": "2026-06-25T00:00:00+00:00",
"remediations": [
{
"category": "vendor_fix",
"date": "2026-07-15T13:47:23+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": 5.5,
"baseSeverity": "MEDIUM",
"confidentialityImpact": "NONE",
"integrityImpact": "NONE",
"privilegesRequired": "LOW",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
"version": "3.1"
},
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"threats": [
{
"category": "impact",
"details": "Moderate"
}
],
"title": "kernel: futex/requeue: Prevent NULL pointer dereference in remove_waiter() on self-deadlock"
},
{
"cve": "CVE-2026-64600",
"cwe": {
"id": "CWE-362",
"name": "Concurrent Execution using Shared Resource with Improper Synchronization (\u0027Race Condition\u0027)"
},
"discovery_date": "2026-07-10T06:29:23.730000+00:00",
"ids": [
{
"system_name": "Red Hat Bugzilla ID",
"text": "2498915"
}
],
"notes": [
{
"category": "description",
"text": "A flaw was found in the XFS filesystem. A race condition in the copy-on-write mechanism for reflinked files can cause writes to bypass the copy-on-write process and modify shared data blocks directly. As a result, data intended for a private copy may be written to the original shared location, corrupting the contents of other files that reference those blocks. A local attacker with read access to a file on an XFS filesystem with reflink enabled could exploit this flaw to corrupt files they do not have write access to, allowing content to be added to the target file. If properly exploited this vulnerability may lead to privilege escalations or arbitrary code execution.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "kernel: XFS data corruption using reflink",
"title": "Vulnerability summary"
},
{
"category": "other",
"text": "This flaw affects XFS filesystems that have the reflink feature enabled (reflink=1), which is the default configuration for XFS filesystems created on Red Hat Enterprise Linux 8 and later. The issue is a race condition where internal file mapping information becomes stale during a lock cycle but is not refreshed before being used to determine whether data blocks are shared between files. Exploitation requires local access and read permission to the target file. Systems using XFS without reflink enabled, or using other filesystems such as ext4, are not affected. Red Hat Enterprise Linux 7 and earlier are not affected, as the reflink feature is not available on those versions.",
"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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"references": [
{
"category": "self",
"summary": "Canonical URL",
"url": "https://access.redhat.com/security/cve/CVE-2026-64600"
},
{
"category": "external",
"summary": "RHBZ#2498915",
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2498915"
},
{
"category": "external",
"summary": "https://www.cve.org/CVERecord?id=CVE-2026-64600",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-64600"
},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2026-64600",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-64600"
}
],
"release_date": "2026-07-14T00:00:00+00:00",
"remediations": [
{
"category": "vendor_fix",
"date": "2026-07-15T13:47:23+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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"category": "workaround",
"details": "This vulnerability can be mitigated using a SystemTap script. To create and apply the mitigation, follow the steps below:\n\n1. Install and configure SystemTap\n\nInstall the SystemTap package and its dependencies following the instructions at:\nhttps://docs.redhat.com/en/documentation/red_hat_enterprise_linux/10/html/monitoring_and_managing_system_status_and_performance/getting-started-with-systemtap\n\n2. Create the mitigation script\n\nCreate a file named `refluxfs_mitigation.stp` with the following contents:\n\n~~~\nprobe begin {\n printf(\"refluxfs mitigation loaded\\n\")\n}\n\nprobe module(\"xfs\").function(\"xfs_file_remap_range\").call {\n $remap_flags = 0xffff\n}\n\nprobe module(\"xfs\").function(\"xfs_file_remap_range\").return {\n $return = -95\n}\n\nprobe end {\n printf(\"refluxfs mitigation unloaded\\n\")\n}\n~~~\n\n3. Load the mitigation\n\nAs the `root` user, execute SystemTap in guru mode:\n\n~~~\nstap -g refluxfs_mitigation.stp\n~~~\n\nOnce the script is compiled and loaded, the following message will appear:\n\n~~~\nrefluxfs mitigation loaded\n~~~\n\nWith the mitigation active, any application attempting to use reflink to copy files will receive `-EOPNOTSUPP` (`-95`) when calling the `FICLONE` ioctl (or its variants) or the `copy_file_range()` syscall.\n\nImportant considerations:\n\n1. SystemTap scripts are compiled into kernel modules. On systems with Secure Boot enabled, the kernel is in lockdown mode and will only load modules signed with a valid Secure Boot key or a key enrolled in the MOK. SystemTap can sign the generated module at compile time, but the user is responsible for key management. For instructions, refer to the \"Sign a SystemTap module\" section of:\nhttps://www.redhat.com/en/blog/secure-boot-systemtap\n\n2. The SystemTap module is not persistent across reboots. If the machine is restarted or the `stap` process is terminated, the module will be unloaded and the mitigation must be reapplied.\n\n3. Programs that rely on CoW/reflink without a fallback mechanism may fail, as reflink operations will be unavailable on any XFS filesystem while the mitigation is loaded. This includes the `cp` command when run with `--reflink=always`. In that case, use `--reflink=auto` instead, which is the default behavior in Red Hat Enterprise Linux.",
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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: XFS data corruption using reflink"
}
]
}
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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.
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