RHSA-2025:23427
Vulnerability from csaf_redhat - Published: 2025-12-17 03:33 - Updated: 2026-03-13 01:08Summary
Red Hat Security Advisory: kernel security update
Notes
Topic
An update for kernel is now available for Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions and Red Hat Enterprise Linux 8.8 Telecommunications Update Service.
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: mm: kmem: fix a NULL pointer dereference in obj_stock_flush_required() (CVE-2023-53401)
* kernel: tcp: Clear tcp_sk(sk)->fastopen_rsk in tcp_disconnect() (CVE-2025-39955)
* kernel: tcp: Don't call reqsk_fastopen_remove() in tcp_conn_request() (CVE-2025-40186)
For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.
Terms of Use
This content is licensed under the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0/). If you distribute this content, or a modified version of it, you must provide attribution to Red Hat Inc. and provide a link to the original.
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"category": "description",
"text": "A null pointer dereference exists in the linux kernel such that in obj_stock_flush_required():stock-\u003ecached_objcg can be reset between the check and dereference, resulting in damage to the availability of the system.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "kernel: mm: kmem: fix a NULL pointer dereference in obj_stock_flush_required()",
"title": "Vulnerability summary"
},
{
"category": "other",
"text": "A race in the memcg/objcg accounting allowed stock-\u003ecached_objcg to change between check and use, leading to a NULL pointer dereference and kernel crash under concurrency. The fix uses READ_ONCE/WRITE_ONCE for all accesses to cached_objcg, eliminating the data race observed by KCSAN. Impact is a local kernel DoS",
"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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"restart_required": {
"category": "machine"
},
"url": "https://access.redhat.com/errata/RHSA-2025:23427"
},
{
"category": "workaround",
"details": "Mitigation for this issue is either not available or the currently available options don\u0027t meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability.",
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"scores": [
{
"cvss_v3": {
"attackComplexity": "LOW",
"attackVector": "LOCAL",
"availabilityImpact": "HIGH",
"baseScore": 7.3,
"baseSeverity": "HIGH",
"confidentialityImpact": "LOW",
"integrityImpact": "LOW",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:H",
"version": "3.1"
},
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"threats": [
{
"category": "impact",
"details": "Moderate"
}
],
"title": "kernel: mm: kmem: fix a NULL pointer dereference in obj_stock_flush_required()"
},
{
"cve": "CVE-2025-39955",
"cwe": {
"id": "CWE-213",
"name": "Exposure of Sensitive Information Due to Incompatible Policies"
},
"discovery_date": "2025-10-09T00:00:00+00:00",
"ids": [
{
"system_name": "Red Hat Bugzilla ID",
"text": "2402699"
}
],
"notes": [
{
"category": "description",
"text": "A flaw was found in the TCP subsystem in tcp_disconnect of the Linux kernel.The server-side TCP Fast Open socket was reused as a new client before the TFO socket completes, leading to an information leak.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "kernel: tcp: Clear tcp_sk(sk)-\u003efastopen_rsk in tcp_disconnect()",
"title": "Vulnerability summary"
},
{
"category": "other",
"text": "tcp_disconnect() failed to clear tcp_sk(sk)-\u003efastopen_rsk when reusing a TFO socket (e.g., after accept() \u2192 connect(AF_UNSPEC) \u2192 connect() sequence).\nThis left a stale reference, allowing the retransmit timer to access a freed request_sock, triggering a kernel warning or potential UAF.\nTriggering requires local access and the ability to create and manipulate TCP Fast Open sockets (often through privileged or test contexts).",
"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-2025-39955"
},
{
"category": "external",
"summary": "RHBZ#2402699",
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2402699"
},
{
"category": "external",
"summary": "https://www.cve.org/CVERecord?id=CVE-2025-39955",
"url": "https://www.cve.org/CVERecord?id=CVE-2025-39955"
},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2025-39955",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2025-39955"
},
{
"category": "external",
"summary": "https://lore.kernel.org/linux-cve-announce/2025100942-CVE-2025-39955-f36b@gregkh/T",
"url": "https://lore.kernel.org/linux-cve-announce/2025100942-CVE-2025-39955-f36b@gregkh/T"
}
],
"release_date": "2025-10-09T00:00:00+00:00",
"remediations": [
{
"category": "vendor_fix",
"date": "2025-12-17T03:33:09+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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},
"url": "https://access.redhat.com/errata/RHSA-2025:23427"
}
],
"scores": [
{
"cvss_v3": {
"attackComplexity": "LOW",
"attackVector": "ADJACENT_NETWORK",
"availabilityImpact": "HIGH",
"baseScore": 7.6,
"baseSeverity": "HIGH",
"confidentialityImpact": "LOW",
"integrityImpact": "LOW",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:H",
"version": "3.1"
},
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"threats": [
{
"category": "impact",
"details": "Moderate"
}
],
"title": "kernel: tcp: Clear tcp_sk(sk)-\u003efastopen_rsk in tcp_disconnect()"
},
{
"cve": "CVE-2025-40186",
"cwe": {
"id": "CWE-826",
"name": "Premature Release of Resource During Expected Lifetime"
},
"discovery_date": "2025-11-12T00:00:00+00:00",
"ids": [
{
"system_name": "Red Hat Bugzilla ID",
"text": "2414724"
}
],
"notes": [
{
"category": "description",
"text": "A flaw was found in the Linux kernel. A local attacker with low privileges could exploit a memory corruption vulnerability, specifically a use-after-free and double-free, within the TCP Fast Open (TFO) socket processing. This occurs when a listener is closed while a TFO socket is being processed in `tcp_conn_request()`. Successful exploitation could lead to a kernel panic, resulting in a Denial of Service (DoS), or potentially allow the attacker to execute arbitrary code with elevated privileges.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "kernel: Linux kernel: Privilege escalation or Denial of Service via TCP Fast Open vulnerability",
"title": "Vulnerability summary"
},
{
"category": "other",
"text": "This vulnerability is rated Important for Red Hat Enterprise Linux. A local attacker with low privileges can exploit a use-after-free and double-free flaw in the Linux kernel\u0027s TCP Fast Open (TFO) implementation. This could lead to a kernel panic, resulting in a Denial of Service, or potentially allow for privilege escalation. This affects Red Hat Enterprise Linux 7, 8, 9 (up to 9.7.z), and 10 (up to 10.1.z).",
"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-2025-40186"
},
{
"category": "external",
"summary": "RHBZ#2414724",
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2414724"
},
{
"category": "external",
"summary": "https://www.cve.org/CVERecord?id=CVE-2025-40186",
"url": "https://www.cve.org/CVERecord?id=CVE-2025-40186"
},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2025-40186",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2025-40186"
},
{
"category": "external",
"summary": "https://lore.kernel.org/linux-cve-announce/2025111244-CVE-2025-40186-b204@gregkh/T",
"url": "https://lore.kernel.org/linux-cve-announce/2025111244-CVE-2025-40186-b204@gregkh/T"
}
],
"release_date": "2025-11-12T00:00:00+00:00",
"remediations": [
{
"category": "vendor_fix",
"date": "2025-12-17T03:33:09+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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],
"restart_required": {
"category": "machine"
},
"url": "https://access.redhat.com/errata/RHSA-2025:23427"
}
],
"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: Linux kernel: Privilege escalation or Denial of Service via TCP Fast Open vulnerability"
}
]
}
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Sightings
| Author | Source | Type | Date |
|---|
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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