RHSA-2025:19223
Vulnerability from csaf_redhat - Published: 2025-10-29 00:20 - Updated: 2026-03-18 03:08Summary
Red Hat Security Advisory: kernel-rt security update
Severity
Moderate
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 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-rt packages provide the Real Time Linux Kernel, which enables fine-tuning for systems with extremely high determinism requirements.
Security Fix(es):
* kernel: HID: core: Harden s32ton() against conversion to 0 bits (CVE-2025-38556)
* kernel: sctp: linearize cloned gso packets in sctp_rcv (CVE-2025-38718)
* kernel: tls: fix handling of zero-length records on the rx_list (CVE-2025-39682)
* kernel: ALSA: hda/ca0132: Fix buffer overflow in add_tuning_control (CVE-2025-39751)
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.
In the Linux kernel, the following vulnerability has been resolved: HID: core: Harden s32ton() against conversion to 0 bits Testing by the syzbot fuzzer showed that the HID core gets a shift-out-of-bounds exception when it tries to convert a 32-bit quantity to a 0-bit quantity. Ideally this should never occur, but there are buggy devices and some might have a report field with size set to zero; we shouldn't reject the report or the device just because of that. Instead, harden the s32ton() routine so that it returns a reasonable result instead of crashing when it is called with the number of bits set to 0 -- the same as what snto32() does.
7.1 (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-2025:19223
A flaw use of uninitialized memory (uncontrolled and invisible by attacker) in the Linux kernel SCTP transport protocol was found in the way user triggers malicious SCTP packets. A remote user could use this flaw to crash the system. The bug actual only for systems where SCTP protocol being enabled and used.
7.5 (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-2025:19223
Workaround
To mitigate this issue, prevent module sctp from being loaded. Please see https://access.redhat.com/solutions/41278 for how to blacklist a kernel module to prevent it from loading automatically.
In the Linux kernel, the following vulnerability has been resolved: tls: fix handling of zero-length records on the rx_list Each recvmsg() call must process either - only contiguous DATA records (any number of them) - one non-DATA record If the next record has different type than what has already been processed we break out of the main processing loop. If the record has already been decrypted (which may be the case for TLS 1.3 where we don't know type until decryption) we queue the pending record to the rx_list. Next recvmsg() will pick it up from there. Queuing the skb to rx_list after zero-copy decrypt is not possible, since in that case we decrypted directly to the user space buffer, and we don't have an skb to queue (darg.skb points to the ciphertext skb for access to metadata like length). Only data records are allowed zero-copy, and we break the processing loop after each non-data record. So we should never zero-copy and then find out that the record type has changed. The corner case we missed is when the initial record comes from rx_list, and it's zero length.
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-2025:19223
Workaround
To mitigate this issue, prevent module tls from being loaded. Please see https://access.redhat.com/solutions/41278 for how to blacklist a kernel module to prevent it from loading automatically.
This CVE has been marked as Rejected by the assigning CNA.
0.0 (None)
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-2025:19223
References
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"name": "Out-of-bounds Read"
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"discovery_date": "2025-08-19T00:00:00+00:00",
"ids": [
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"text": "2389456"
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"notes": [
{
"category": "description",
"text": "In the Linux kernel, the following vulnerability has been resolved:\n\nHID: core: Harden s32ton() against conversion to 0 bits\n\nTesting by the syzbot fuzzer showed that the HID core gets a\nshift-out-of-bounds exception when it tries to convert a 32-bit\nquantity to a 0-bit quantity. Ideally this should never occur, but\nthere are buggy devices and some might have a report field with size\nset to zero; we shouldn\u0027t reject the report or the device just because\nof that.\n\nInstead, harden the s32ton() routine so that it returns a reasonable\nresult instead of crashing when it is called with the number of bits\nset to 0 -- the same as what snto32() does.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "kernel: HID: core: Harden s32ton() against conversion to 0 bits",
"title": "Vulnerability summary"
},
{
"category": "other",
"text": "HID core could crash on malformed devices that define a 0-bit report field, causing a shift-out-of-bounds in s32ton(). Exploitation requires only connecting a malicious HID device (no privileges or user interaction), leading to kernel crash.",
"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",
"summary": "Canonical URL",
"url": "https://access.redhat.com/security/cve/CVE-2025-38556"
},
{
"category": "external",
"summary": "RHBZ#2389456",
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2389456"
},
{
"category": "external",
"summary": "https://www.cve.org/CVERecord?id=CVE-2025-38556",
"url": "https://www.cve.org/CVERecord?id=CVE-2025-38556"
},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2025-38556",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2025-38556"
},
{
"category": "external",
"summary": "https://lore.kernel.org/linux-cve-announce/2025081905-CVE-2025-38556-521e@gregkh/T",
"url": "https://lore.kernel.org/linux-cve-announce/2025081905-CVE-2025-38556-521e@gregkh/T"
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{
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{
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"text": "A flaw use of uninitialized memory (uncontrolled and invisible by attacker) in the Linux kernel SCTP transport protocol was found in the way user triggers malicious SCTP packets. A remote user could use this flaw to crash the system. The bug actual only for systems where SCTP protocol being enabled and used.",
"title": "Vulnerability description"
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{
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"text": "kernel: sctp: linearize cloned gso packets in sctp_rcv",
"title": "Vulnerability summary"
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{
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"text": "A flaw in the SCTP receive path failed to linearize cloned GSO sk_buffs before accessing fraglists, leading to reads of uninitialized memory as reported by KMSAN. An attacker sending SCTP traffic can trigger incorrect processing and potentially cause a kernel denial of service on the target under specific RX conditions.\nStream Control Transmission Protocol (SCTP) is a transport-layer protocol (like TCP or UDP) primarily used in telecom signaling and some specialized applications. On most Linux systems it is disabled by default, and remote connectivity is only possible if SCTP support is enabled and listening services are configured (commonly using the IANA-assigned port 2905/tcp for M3UA or other protocol-specific ports). Therefore, the vulnerability is only exploitable when SCTP is enabled and reachable on the target system.\nAlthough KMSAN reports this issue as use of uninitialized memory (which deterministically crashes with KMSAN enabled), on production kernels the impact is still availability-related.",
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{
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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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{
"category": "self",
"summary": "Canonical URL",
"url": "https://access.redhat.com/security/cve/CVE-2025-38718"
},
{
"category": "external",
"summary": "RHBZ#2393166",
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2393166"
},
{
"category": "external",
"summary": "https://www.cve.org/CVERecord?id=CVE-2025-38718",
"url": "https://www.cve.org/CVERecord?id=CVE-2025-38718"
},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2025-38718",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2025-38718"
},
{
"category": "external",
"summary": "https://lore.kernel.org/linux-cve-announce/2025090459-CVE-2025-38718-5bb6@gregkh/T",
"url": "https://lore.kernel.org/linux-cve-announce/2025090459-CVE-2025-38718-5bb6@gregkh/T"
}
],
"release_date": "2025-09-04T00:00:00+00:00",
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{
"category": "vendor_fix",
"date": "2025-10-29T00:20:39+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: sctp: linearize cloned gso packets in sctp_rcv"
},
{
"cve": "CVE-2025-39682",
"discovery_date": "2025-09-05T00:00:00+00:00",
"ids": [
{
"system_name": "Red Hat Bugzilla ID",
"text": "2393511"
}
],
"notes": [
{
"category": "description",
"text": "In the Linux kernel, the following vulnerability has been resolved:\n\ntls: fix handling of zero-length records on the rx_list\n\nEach recvmsg() call must process either\n - only contiguous DATA records (any number of them)\n - one non-DATA record\n\nIf the next record has different type than what has already been\nprocessed we break out of the main processing loop. If the record\nhas already been decrypted (which may be the case for TLS 1.3 where\nwe don\u0027t know type until decryption) we queue the pending record\nto the rx_list. Next recvmsg() will pick it up from there.\n\nQueuing the skb to rx_list after zero-copy decrypt is not possible,\nsince in that case we decrypted directly to the user space buffer,\nand we don\u0027t have an skb to queue (darg.skb points to the ciphertext\nskb for access to metadata like length).\n\nOnly data records are allowed zero-copy, and we break the processing\nloop after each non-data record. So we should never zero-copy and\nthen find out that the record type has changed. The corner case\nwe missed is when the initial record comes from rx_list, and it\u0027s\nzero length.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "kernel: tls: fix handling of zero-length records on the rx_list",
"title": "Vulnerability summary"
},
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"text": "A logic bug in the kTLS receive path mishandles zero-length records taken from the rx_list, allowing a mixed record-type sequence to slip past the per-recvmsg() type constraint and proceed to data processing. The fix initializes and checks the per-call content type (using 0 as \u201cunset\u201d) and bails out when a non-DATA record is encountered after DATA. This can be remotely triggered only when kernel TLS (CONFIG_TLS with the TLS ULP) is in use.\nThis issue can only be triggered when the kernel TLS ULP (kTLS, enabled via CONFIG_TLS and attached to TCP sockets with SOL_TLS) is in use",
"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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{
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{
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"summary": "https://nvd.nist.gov/vuln/detail/CVE-2025-39682",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2025-39682"
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{
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"title": "kernel: tls: fix handling of zero-length records on the rx_list"
},
{
"cve": "CVE-2025-39751",
"cwe": {
"id": "CWE-120",
"name": "Buffer Copy without Checking Size of Input (\u0027Classic Buffer Overflow\u0027)"
},
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"ids": [
{
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"text": "2394624"
}
],
"notes": [
{
"category": "description",
"text": "This CVE has been marked as Rejected by the assigning CNA.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "kernel: Linux kernel ALSA hda/ca0132 buffer overflow",
"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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},
{
"category": "external",
"summary": "RHBZ#2394624",
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2394624"
},
{
"category": "external",
"summary": "https://www.cve.org/CVERecord?id=CVE-2025-39751",
"url": "https://www.cve.org/CVERecord?id=CVE-2025-39751"
},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2025-39751",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2025-39751"
},
{
"category": "external",
"summary": "https://lore.kernel.org/linux-cve-announce/2025091142-CVE-2025-39751-c340@gregkh/T",
"url": "https://lore.kernel.org/linux-cve-announce/2025091142-CVE-2025-39751-c340@gregkh/T"
}
],
"release_date": "2025-09-11T00:00:00+00:00",
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{
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"date": "2025-10-29T00:20:39+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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}
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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