RHSA-2025:17733
Vulnerability from csaf_redhat - Published: 2025-10-10 19:52 - Updated: 2026-03-18 03:08Summary
Red Hat Security Advisory: kernel security update
Severity
Important
Notes
Topic: An update for kernel is now available for Red Hat Enterprise Linux 6 Extended Lifecycle Support - EXTENSION.
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: out-of-bounds write in xt_compat_target_from_user() in net/netfilter/x_tables.c (CVE-2021-22555)
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 flaw was discovered in processing setsockopt IPT_SO_SET_REPLACE (or IP6T_SO_SET_REPLACE) for 32 bit processes on 64 bit systems. This flaw will allow local user to gain privileges or cause a DoS through user name space. This action is usually restricted to root-privileged users but can also be leveraged if the kernel is compiled with CONFIG_USER_NS and CONFIG_NET_NS and the user is granted elevated privileges.
7.8 (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-2025:17733
Workaround
The mitigation for the Red Hat Enterprise Linux 8 is to disable unprivileged users from running unshare(CLONE_NEWUSER) or unshare(CLONE_NEWNET) that could be done with this command:
echo 0 > /proc/sys/user/max_user_namespaces
For making this change in configuration permanent.
Note: User namespaces are used primarily for Linux containers. If containers are in use, this requirement is not applicable.
Configure RHEL 8 to disable the use of user namespaces by adding the following line to a file in the "/etc/sysctl.d/" directory:
user.max_user_namespaces = 0
The system configuration files need to be reloaded for the changes to take effect. To reload the contents of the files, run the following command:
$ sudo sysctl --system
The other mitigation for containers, if without disabling user namespaces, is blocking the pertinent syscalls in a seccomp policy file. For more information about seccomp, please read: https://www.openshift.com/blog/seccomp-for-fun-and-profit
References
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"text": "A flaw was discovered in processing setsockopt IPT_SO_SET_REPLACE (or IP6T_SO_SET_REPLACE) for 32 bit processes on 64 bit systems. This flaw will allow local user to gain privileges or cause a DoS through user name space. This action is usually restricted to root-privileged users but can also be leveraged if the kernel is compiled with CONFIG_USER_NS and CONFIG_NET_NS and the user is granted elevated privileges.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "kernel: out-of-bounds write in xt_compat_target_from_user() in net/netfilter/x_tables.c",
"title": "Vulnerability summary"
},
{
"category": "other",
"text": "In Red Hat Enterprise Linux 7, only privileged users can trigger this bug. In Red Hat Enterprise Linux 8 a regular user can trigger it, however the result is corruption of 4 bytes of memory.",
"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",
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"details": "The mitigation for the Red Hat Enterprise Linux 8 is to disable unprivileged users from running unshare(CLONE_NEWUSER) or unshare(CLONE_NEWNET) that could be done with this command:\necho 0 \u003e /proc/sys/user/max_user_namespaces\n\nFor making this change in configuration permanent.\nNote: User namespaces are used primarily for Linux containers. If containers are in use, this requirement is not applicable.\nConfigure RHEL 8 to disable the use of user namespaces by adding the following line to a file in the \"/etc/sysctl.d/\" directory:\n\nuser.max_user_namespaces = 0\n\nThe system configuration files need to be reloaded for the changes to take effect. To reload the contents of the files, run the following command:\n\n$ sudo sysctl --system\n\n\nThe other mitigation for containers, if without disabling user namespaces, is blocking the pertinent syscalls in a seccomp policy file. For more information about seccomp, please read: https://www.openshift.com/blog/seccomp-for-fun-and-profit",
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"scores": [
{
"cvss_v3": {
"attackComplexity": "LOW",
"attackVector": "LOCAL",
"availabilityImpact": "HIGH",
"baseScore": 7.8,
"baseSeverity": "HIGH",
"confidentialityImpact": "HIGH",
"integrityImpact": "HIGH",
"privilegesRequired": "LOW",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
"version": "3.1"
},
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}
],
"threats": [
{
"category": "exploit_status",
"date": "2025-10-06T00:00:00+00:00",
"details": "CISA: https://www.cisa.gov/known-exploited-vulnerabilities-catalog"
},
{
"category": "impact",
"details": "Important"
}
],
"title": "kernel: out-of-bounds write in xt_compat_target_from_user() in net/netfilter/x_tables.c"
}
]
}
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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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