RHSA-2025:10211
Vulnerability from csaf_redhat - Published: 2025-07-02 13:30 - Updated: 2026-03-18 03:00Summary
Red Hat Security Advisory: kernel security update
Severity
Moderate
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 Moderate. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.
Details: The kernel packages contain the Linux kernel, the core of any Linux operating system.
Security Fix(es):
* kernel: um: Fix out-of-bounds read in LDT setup (CVE-2022-49395)
* kernel: Bluetooth: Fix use after free in hci_send_acl (CVE-2022-49111)
* kernel: ndisc: use RCU protection in ndisc_alloc_skb() (CVE-2025-21764)
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 vulnerability was found in the Linux kernel's Bluetooth subsystem in the `hci_disconn_phylink_complete_evt()` function. Improper cleanup and reference handling can lead to a connection object, `hcon`, being freed and then later accessed during a subsequent function call. This issue can lead to a use-after-free scenario, leading to system instability, memory corruption, and potential code execution.
7.0 (High)
Vendor Fix
For details on how to apply this update, which includes the changes described in this advisory, refer to:
https://access.redhat.com/articles/11258
The system must be rebooted for this update to take effect.
https://access.redhat.com/errata/RHSA-2025:10211
A vulnerability was found in the Linux kernel's user mode (um) subsystem, specifically within the Local Descriptor Table (LDT) setup functionality. The issue arises from the syscall_stub_data() function misinterpreting the data_count parameter as a byte count rather than a count of longs, leading to an out-of-bounds read. This flaw could expose sensitive kernel memory and cause system instability.
6.0 (Medium)
Vendor Fix
For details on how to apply this update, which includes the changes described in this advisory, refer to:
https://access.redhat.com/articles/11258
The system must be rebooted for this update to take effect.
https://access.redhat.com/errata/RHSA-2025:10211
A vulnerability was found in the Linux kernel's IPv6 Neighbor Discovery (NDISC) subsystem, which manages network neighbor information. The issue arises from improper synchronization mechanisms when allocating socket buffers (sk_buff) in the ndisc_alloc_skb() function. Specifically, the function can be called without holding the necessary Read-Copy-Update (RCU) or Routing Netlink (RTNL) locks, leading to a potential use-after-free (UAF) condition. This flaw allows an attacker with local access and low privileges to exploit the race condition, potentially causing system instability or crashes.
7.0 (High)
Vendor Fix
For details on how to apply this update, which includes the changes described in this advisory, refer to:
https://access.redhat.com/articles/11258
The system must be rebooted for this update to take effect.
https://access.redhat.com/errata/RHSA-2025:10211
References
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"text": "A vulnerability was found in the Linux kernel\u0027s Bluetooth subsystem in the `hci_disconn_phylink_complete_evt()` function. Improper cleanup and reference handling can lead to a connection object, `hcon`, being freed and then later accessed during a subsequent function call. This issue can lead to a use-after-free scenario, leading to system instability, memory corruption, and potential code execution.",
"title": "Vulnerability description"
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"text": "kernel: Bluetooth: Fix use after free in hci_send_acl",
"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.",
"title": "CVSS score applicability"
}
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},
"url": "https://access.redhat.com/errata/RHSA-2025:10211"
}
],
"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": "Moderate"
}
],
"title": "kernel: Bluetooth: Fix use after free in hci_send_acl"
},
{
"cve": "CVE-2022-49395",
"cwe": {
"id": "CWE-125",
"name": "Out-of-bounds Read"
},
"discovery_date": "2025-02-26T00:00:00+00:00",
"ids": [
{
"system_name": "Red Hat Bugzilla ID",
"text": "2347899"
}
],
"notes": [
{
"category": "description",
"text": "A vulnerability was found in the Linux kernel\u0027s user mode (um) subsystem, specifically within the Local Descriptor Table (LDT) setup functionality. The issue arises from the syscall_stub_data() function misinterpreting the data_count parameter as a byte count rather than a count of longs, leading to an out-of-bounds read. This flaw could expose sensitive kernel memory and cause system instability.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "kernel: um: Fix out-of-bounds read in LDT setup",
"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-2022-49395"
},
{
"category": "external",
"summary": "RHBZ#2347899",
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2347899"
},
{
"category": "external",
"summary": "https://www.cve.org/CVERecord?id=CVE-2022-49395",
"url": "https://www.cve.org/CVERecord?id=CVE-2022-49395"
},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2022-49395",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2022-49395"
},
{
"category": "external",
"summary": "https://lore.kernel.org/linux-cve-announce/2025022650-CVE-2022-49395-7419@gregkh/T",
"url": "https://lore.kernel.org/linux-cve-announce/2025022650-CVE-2022-49395-7419@gregkh/T"
}
],
"release_date": "2025-02-26T00:00:00+00:00",
"remediations": [
{
"category": "vendor_fix",
"date": "2025-07-02T13:30:01+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-2025:10211"
}
],
"scores": [
{
"cvss_v3": {
"attackComplexity": "LOW",
"attackVector": "LOCAL",
"availabilityImpact": "HIGH",
"baseScore": 6.0,
"baseSeverity": "MEDIUM",
"confidentialityImpact": "HIGH",
"integrityImpact": "NONE",
"privilegesRequired": "HIGH",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:N/A:H",
"version": "3.1"
},
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"threats": [
{
"category": "impact",
"details": "Moderate"
}
],
"title": "kernel: um: Fix out-of-bounds read in LDT setup"
},
{
"cve": "CVE-2025-21764",
"cwe": {
"id": "CWE-416",
"name": "Use After Free"
},
"discovery_date": "2025-02-27T00:00:00+00:00",
"ids": [
{
"system_name": "Red Hat Bugzilla ID",
"text": "2348575"
}
],
"notes": [
{
"category": "description",
"text": "A vulnerability was found in the Linux kernel\u0027s IPv6 Neighbor Discovery (NDISC) subsystem, which manages network neighbor information. The issue arises from improper synchronization mechanisms when allocating socket buffers (sk_buff) in the ndisc_alloc_skb() function. Specifically, the function can be called without holding the necessary Read-Copy-Update (RCU) or Routing Netlink (RTNL) locks, leading to a potential use-after-free (UAF) condition. This flaw allows an attacker with local access and low privileges to exploit the race condition, potentially causing system instability or crashes.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "kernel: ndisc: use RCU protection in ndisc_alloc_skb()",
"title": "Vulnerability summary"
},
{
"category": "other",
"text": "Red Hat Product Security has rated this bug as Moderate due to the following:\n\nDifficult to exploit reliably:\n* Requires winning a race condition in the kernel.\n* No known public PoC or exploitation.\n* Might be nondeterministic and hard to control memory reuse.\n\nMay not lead to code execution:\n* Use After Free doesn\u2019t automatically mean control.\n* Many kernel UAFs cause crashes but not privilege escalation or info leaks unless paired with other bugs.\n\nLimited exposure:\n* Requires IPv6 to be enabled.\n* Possibly depends on attacker having raw socket access or other local privileges.\n* Mitigations Like KASLR, SLAB hardening, and SELinux may further reduce practical risk.",
"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-2025-21764"
},
{
"category": "external",
"summary": "RHBZ#2348575",
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2348575"
},
{
"category": "external",
"summary": "https://www.cve.org/CVERecord?id=CVE-2025-21764",
"url": "https://www.cve.org/CVERecord?id=CVE-2025-21764"
},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2025-21764",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2025-21764"
},
{
"category": "external",
"summary": "https://lore.kernel.org/linux-cve-announce/2025022605-CVE-2025-21764-1061@gregkh/T",
"url": "https://lore.kernel.org/linux-cve-announce/2025022605-CVE-2025-21764-1061@gregkh/T"
}
],
"release_date": "2025-02-27T00:00:00+00:00",
"remediations": [
{
"category": "vendor_fix",
"date": "2025-07-02T13:30:01+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-2025:10211"
}
],
"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": "Moderate"
}
],
"title": "kernel: ndisc: use RCU protection in ndisc_alloc_skb()"
}
]
}
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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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