RHSA-2025:14599
Vulnerability from csaf_redhat - Published: 2025-08-26 10:28 - Updated: 2025-12-22 19:53Summary
Red Hat Security Advisory: kpatch-patch-5_14_0-284_104_1, kpatch-patch-5_14_0-284_117_1, kpatch-patch-5_14_0-284_52_1, kpatch-patch-5_14_0-284_79_1, and kpatch-patch-5_14_0-284_92_1 security update
Severity
Important
Notes
Topic: An update for multiple packages 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: This is a kernel live patch module which can be loaded by the kpatch command line utility to modify the code of a running kernel. This patch module is targeted for kernel-5.14.0-284.52.1.el9_2.
Security Fix(es):
* kernel: tls: always refresh the queue when reading sock (CVE-2025-38471)
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: tls: always refresh the queue when reading sock After recent changes in net-next TCP compacts skbs much more aggressively. This unearthed a bug in TLS where we may try to operate on an old skb when checking if all skbs in the queue have matching decrypt state and geometry. BUG: KASAN: slab-use-after-free in tls_strp_check_rcv+0x898/0x9a0 [tls] (net/tls/tls_strp.c:436 net/tls/tls_strp.c:530 net/tls/tls_strp.c:544) Read of size 4 at addr ffff888013085750 by task tls/13529 CPU: 2 UID: 0 PID: 13529 Comm: tls Not tainted 6.16.0-rc5-virtme Call Trace: kasan_report+0xca/0x100 tls_strp_check_rcv+0x898/0x9a0 [tls] tls_rx_rec_wait+0x2c9/0x8d0 [tls] tls_sw_recvmsg+0x40f/0x1aa0 [tls] inet_recvmsg+0x1c3/0x1f0 Always reload the queue, fast path is to have the record in the queue when we wake, anyway (IOW the path going down "if !strp->stm.full_len").
7.4 (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-2025:14599
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.
References
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"category": "description",
"text": "In the Linux kernel, the following vulnerability has been resolved:\n\ntls: always refresh the queue when reading sock\n\nAfter recent changes in net-next TCP compacts skbs much more\naggressively. This unearthed a bug in TLS where we may try\nto operate on an old skb when checking if all skbs in the\nqueue have matching decrypt state and geometry.\n\n BUG: KASAN: slab-use-after-free in tls_strp_check_rcv+0x898/0x9a0 [tls]\n (net/tls/tls_strp.c:436 net/tls/tls_strp.c:530 net/tls/tls_strp.c:544)\n Read of size 4 at addr ffff888013085750 by task tls/13529\n\n CPU: 2 UID: 0 PID: 13529 Comm: tls Not tainted 6.16.0-rc5-virtme\n Call Trace:\n kasan_report+0xca/0x100\n tls_strp_check_rcv+0x898/0x9a0 [tls]\n tls_rx_rec_wait+0x2c9/0x8d0 [tls]\n tls_sw_recvmsg+0x40f/0x1aa0 [tls]\n inet_recvmsg+0x1c3/0x1f0\n\nAlways reload the queue, fast path is to have the record in the queue\nwhen we wake, anyway (IOW the path going down \"if !strp-\u003estm.full_len\").",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "kernel: tls: always refresh the queue when reading sock",
"title": "Vulnerability summary"
},
{
"category": "other",
"text": "This patch fixes a use-after-free bug in the kernel TLS (kTLS) implementation, where stale SKB pointers could be accessed due to aggressive TCP skb compaction.\nThe function tls_strp_read_sock() failed to reload the skb queue unconditionally, potentially leading to dereferencing freed memory in tls_strp_check_rcv().\nThis issue could be triggered remotely over a TCP+TLS connection and may result in kernel crashes or information disclosure.\nWhile the bug requires precise timing and TCP skb compaction behavior, it may be remotely triggered through a TLS stream and can lead to kernel instability or data leakage from freed memory.\nAlthough the underlying bug is a use-after-free read, it can lead to kernel panic on systems with KASAN, SLUB debug, panic_on_oops=1, or when the freed skb is reused and corrupted, potentially causing further memory violations or invalid state propagation in the TLS receive path.",
"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": "vendor_fix",
"date": "2025-08-26T10:28:05+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": "HIGH",
"attackVector": "NETWORK",
"availabilityImpact": "HIGH",
"baseScore": 7.4,
"baseSeverity": "HIGH",
"confidentialityImpact": "HIGH",
"integrityImpact": "NONE",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:H",
"version": "3.1"
},
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"threats": [
{
"category": "impact",
"details": "Important"
}
],
"title": "kernel: tls: always refresh the queue when reading sock"
}
]
}
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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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