RHSA-2026:1946
Vulnerability from csaf_redhat - Published: 2026-02-04 18:55 - Updated: 2026-02-05 01:34Summary
Red Hat Security Advisory: kernel-rt security update
Notes
Topic
An update for kernel-rt is now available for Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions.
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: Linux kernel: vsock vulnerability may lead to memory corruption (CVE-2025-40248)
* kernel: Linux kernel Bluetooth L2CAP: Kernel crash due to use-after-free via race condition (CVE-2023-53751)
* kernel: net: atlantic: fix fragment overflow handling in RX path (CVE-2025-68301)
* kernel: tcp: fix a signed-integer-overflow bug in tcp_add_backlog() (CVE-2022-50865)
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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"name": "Integer Overflow or Wraparound"
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"text": "2426226"
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{
"category": "description",
"text": "In the Linux kernel, the following vulnerability has been resolved:\n\ntcp: fix a signed-integer-overflow bug in tcp_add_backlog()\n\nThe type of sk_rcvbuf and sk_sndbuf in struct sock is int, and\nin tcp_add_backlog(), the variable limit is caculated by adding\nsk_rcvbuf, sk_sndbuf and 64 * 1024, it may exceed the max value\nof int and overflow. This patch reduces the limit budget by\nhalving the sndbuf to solve this issue since ACK packets are much\nsmaller than the payload.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "kernel: tcp: fix a signed-integer-overflow bug in tcp_add_backlog()",
"title": "Vulnerability summary"
},
{
"category": "other",
"text": "A signed integer overflow in tcp_add_backlog() could occur when computing the backlog limit from sk_rcvbuf and sk_sndbuf, potentially resulting in an incorrect, reduced limit. A remote peer can trigger this condition by sending network traffic that stresses the TCP backlog, leading to premature packet drops and degraded service availability.\nThis issue is a typical network robustness bug, as the integer overflow only affects internal backlog limit calculations and can at most cause packet drops or limited service degradation (DoS), without providing a realistic path to host crashes, memory corruption, privilege escalation, or code execution.",
"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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{
"category": "self",
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"url": "https://access.redhat.com/security/cve/CVE-2022-50865"
},
{
"category": "external",
"summary": "RHBZ#2426226",
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2426226"
},
{
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},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2022-50865",
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},
{
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},
{
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"ids": [
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{
"category": "description",
"text": "In the Linux kernel, the following vulnerability has been resolved:\n\ncifs: fix potential use-after-free bugs in TCP_Server_Info::hostname\n\nTCP_Server_Info::hostname may be updated once or many times during\nreconnect, so protect its access outside reconnect path as well and\nthen prevent any potential use-after-free bugs.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "kernel: Linux kernel Bluetooth L2CAP: Kernel crash due to use-after-free via race condition",
"title": "Vulnerability summary"
},
{
"category": "other",
"text": "A use-after-free vulnerability was found in the Linux kernel Bluetooth L2CAP subsystem. Due to a race condition during L2CAP channel disconnect handling, a channel structure may be accessed after being freed. An adjacent attacker within Bluetooth range can trigger this issue without authentication, potentially causing a kernel crash, while reliable code execution would require precise timing and complex heap manipulation.",
"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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{
"category": "self",
"summary": "Canonical URL",
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},
{
"category": "external",
"summary": "RHBZ#2419858",
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2419858"
},
{
"category": "external",
"summary": "https://www.cve.org/CVERecord?id=CVE-2023-53751",
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},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2023-53751",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2023-53751"
},
{
"category": "external",
"summary": "https://lore.kernel.org/linux-cve-announce/2025120842-CVE-2023-53751-2ff2@gregkh/T",
"url": "https://lore.kernel.org/linux-cve-announce/2025120842-CVE-2023-53751-2ff2@gregkh/T"
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{
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{
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"text": "A flaw was found in the Linux kernel\u0027s `vsock` component. This vulnerability occurs when a `connect()` operation on an already established socket is interrupted by a signal or timeout, causing the system to mishandle the socket\u0027s state. This incorrect handling can lead to a race condition, potentially resulting in memory corruption, such as a use-after-free or null-pointer dereference. A local attacker could exploit this to cause a denial of service or potentially escalate privileges.",
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{
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"title": "Vulnerability summary"
},
{
"category": "other",
"text": "This vulnerability is rated Important for Red Hat Enterprise Linux 7, 8, 9, and 10. A flaw in the Linux kernel\u0027s `vsock` component allows a local attacker to cause memory corruption, potentially leading to a denial of service or privilege escalation. This occurs when a `connect()` operation on an established socket is interrupted by a signal or timeout, leading to an incorrect handling of the socket\u0027s state.",
"title": "Statement"
},
{
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"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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"summary": "https://www.cve.org/CVERecord?id=CVE-2025-68301",
"url": "https://www.cve.org/CVERecord?id=CVE-2025-68301"
},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2025-68301",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2025-68301"
},
{
"category": "external",
"summary": "https://lore.kernel.org/linux-cve-announce/2025121643-CVE-2025-68301-be31@gregkh/T",
"url": "https://lore.kernel.org/linux-cve-announce/2025121643-CVE-2025-68301-be31@gregkh/T"
}
],
"release_date": "2025-12-16T00:00:00+00:00",
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{
"category": "vendor_fix",
"date": "2026-02-04T18:55:17+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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"title": "kernel: net: atlantic: fix fragment overflow handling in RX path"
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}
Loading…
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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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