RHSA-2024:7490
Vulnerability from csaf_redhat - Published: 2024-10-02 00:38 - Updated: 2026-03-18 02:44Summary
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 Extended Update Support.
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: netfilter: bridge: confirm multicast packets before passing them up the stack (CVE-2024-27415)
* kernel: net: bridge: mst: fix vlan use-after-free (CVE-2024-36979)
* kernel: net: openvswitch: fix overwriting ct original tuple for ICMPv6 (CVE-2024-38558)
* kernel: netfilter: tproxy: bail out if IP has been disabled on the device (CVE-2024-36270)
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 security vulnerability was identified in the Linux kernel's netfilter subsystem, specifically affecting the handling of multicast and broadcast packets on network bridges. The issue arises from a race condition in the connection tracking (conntrack) module when processing cloned socket buffers (skbs) that reference the same connection entry (nf_conn). This condition can lead to system instability or potential security risks.
5.5 (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-2024:7490
In the Linux kernel, the following vulnerability has been resolved: netfilter: tproxy: bail out if IP has been disabled on the device syzbot reports: general protection fault, probably for non-canonical address 0xdffffc0000000003: 0000 [#1] PREEMPT SMP KASAN PTI KASAN: null-ptr-deref in range [0x0000000000000018-0x000000000000001f] [..] RIP: 0010:nf_tproxy_laddr4+0xb7/0x340 net/ipv4/netfilter/nf_tproxy_ipv4.c:62 Call Trace: nft_tproxy_eval_v4 net/netfilter/nft_tproxy.c:56 [inline] nft_tproxy_eval+0xa9a/0x1a00 net/netfilter/nft_tproxy.c:168 __in_dev_get_rcu() can return NULL, so check for this.
5.5 (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-2024:7490
A use-after-free flaw was found in net/bridge/br_mst.c in the Linux kernel. This issue may lead to compromised Confidentiality and Integrity, and can crash.
6.6 (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-2024:7490
In the Linux kernel, the following vulnerability has been resolved: net: openvswitch: fix overwriting ct original tuple for ICMPv6 OVS_PACKET_CMD_EXECUTE has 3 main attributes: - OVS_PACKET_ATTR_KEY - Packet metadata in a netlink format. - OVS_PACKET_ATTR_PACKET - Binary packet content. - OVS_PACKET_ATTR_ACTIONS - Actions to execute on the packet. OVS_PACKET_ATTR_KEY is parsed first to populate sw_flow_key structure with the metadata like conntrack state, input port, recirculation id, etc. Then the packet itself gets parsed to populate the rest of the keys from the packet headers. Whenever the packet parsing code starts parsing the ICMPv6 header, it first zeroes out fields in the key corresponding to Neighbor Discovery information even if it is not an ND packet. It is an 'ipv6.nd' field. However, the 'ipv6' is a union that shares the space between 'nd' and 'ct_orig' that holds the original tuple conntrack metadata parsed from the OVS_PACKET_ATTR_KEY. ND packets should not normally have conntrack state, so it's fine to share the space, but normal ICMPv6 Echo packets or maybe other types of ICMPv6 can have the state attached and it should not be overwritten. The issue results in all but the last 4 bytes of the destination address being wiped from the original conntrack tuple leading to incorrect packet matching and potentially executing wrong actions in case this packet recirculates within the datapath or goes back to userspace. ND fields should not be accessed in non-ND packets, so not clearing them should be fine. Executing memset() only for actual ND packets to avoid the issue. Initializing the whole thing before parsing is needed because ND packet may not contain all the options. The issue only affects the OVS_PACKET_CMD_EXECUTE path and doesn't affect packets entering OVS datapath from network interfaces, because in this case CT metadata is populated from skb after the packet is already parsed.
5.5 (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-2024:7490
References
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{
"category": "description",
"text": "A security vulnerability was identified in the Linux kernel\u0027s netfilter subsystem, specifically affecting the handling of multicast and broadcast packets on network bridges. The issue arises from a race condition in the connection tracking (conntrack) module when processing cloned socket buffers (skbs) that reference the same connection entry (nf_conn). This condition can lead to system instability or potential security risks.",
"title": "Vulnerability description"
},
{
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"text": "kernel: netfilter: bridge: confirm multicast packets before passing them up the stack",
"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": "self",
"summary": "Canonical URL",
"url": "https://access.redhat.com/security/cve/CVE-2024-27415"
},
{
"category": "external",
"summary": "RHBZ#2281101",
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2281101"
},
{
"category": "external",
"summary": "https://www.cve.org/CVERecord?id=CVE-2024-27415",
"url": "https://www.cve.org/CVERecord?id=CVE-2024-27415"
},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2024-27415",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2024-27415"
},
{
"category": "external",
"summary": "https://lore.kernel.org/linux-cve-announce/2024051702-CVE-2024-27415-dcae@gregkh/T",
"url": "https://lore.kernel.org/linux-cve-announce/2024051702-CVE-2024-27415-dcae@gregkh/T"
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{
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"date": "2024-10-02T00:38:12+00:00",
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{
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{
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"text": "In the Linux kernel, the following vulnerability has been resolved:\n\nnetfilter: tproxy: bail out if IP has been disabled on the device\n\nsyzbot reports:\ngeneral protection fault, probably for non-canonical address 0xdffffc0000000003: 0000 [#1] PREEMPT SMP KASAN PTI\nKASAN: null-ptr-deref in range [0x0000000000000018-0x000000000000001f]\n[..]\nRIP: 0010:nf_tproxy_laddr4+0xb7/0x340 net/ipv4/netfilter/nf_tproxy_ipv4.c:62\nCall Trace:\n nft_tproxy_eval_v4 net/netfilter/nft_tproxy.c:56 [inline]\n nft_tproxy_eval+0xa9a/0x1a00 net/netfilter/nft_tproxy.c:168\n\n__in_dev_get_rcu() can return NULL, so check for this.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "kernel: netfilter: tproxy: bail out if IP has been disabled on the device",
"title": "Vulnerability summary"
},
{
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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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"title": "kernel: net: bridge: mst: fix vlan use-after-free"
},
{
"cve": "CVE-2024-38558",
"cwe": {
"id": "CWE-665",
"name": "Improper Initialization"
},
"discovery_date": "2024-06-19T00:00:00+00:00",
"ids": [
{
"system_name": "Red Hat Bugzilla ID",
"text": "2293441"
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"notes": [
{
"category": "description",
"text": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: openvswitch: fix overwriting ct original tuple for ICMPv6\n\nOVS_PACKET_CMD_EXECUTE has 3 main attributes:\n - OVS_PACKET_ATTR_KEY - Packet metadata in a netlink format.\n - OVS_PACKET_ATTR_PACKET - Binary packet content.\n - OVS_PACKET_ATTR_ACTIONS - Actions to execute on the packet.\n\nOVS_PACKET_ATTR_KEY is parsed first to populate sw_flow_key structure\nwith the metadata like conntrack state, input port, recirculation id,\netc. Then the packet itself gets parsed to populate the rest of the\nkeys from the packet headers.\n\nWhenever the packet parsing code starts parsing the ICMPv6 header, it\nfirst zeroes out fields in the key corresponding to Neighbor Discovery\ninformation even if it is not an ND packet.\n\nIt is an \u0027ipv6.nd\u0027 field. However, the \u0027ipv6\u0027 is a union that shares\nthe space between \u0027nd\u0027 and \u0027ct_orig\u0027 that holds the original tuple\nconntrack metadata parsed from the OVS_PACKET_ATTR_KEY.\n\nND packets should not normally have conntrack state, so it\u0027s fine to\nshare the space, but normal ICMPv6 Echo packets or maybe other types of\nICMPv6 can have the state attached and it should not be overwritten.\n\nThe issue results in all but the last 4 bytes of the destination\naddress being wiped from the original conntrack tuple leading to\nincorrect packet matching and potentially executing wrong actions\nin case this packet recirculates within the datapath or goes back\nto userspace.\n\nND fields should not be accessed in non-ND packets, so not clearing\nthem should be fine. Executing memset() only for actual ND packets to\navoid the issue.\n\nInitializing the whole thing before parsing is needed because ND packet\nmay not contain all the options.\n\nThe issue only affects the OVS_PACKET_CMD_EXECUTE path and doesn\u0027t\naffect packets entering OVS datapath from network interfaces, because\nin this case CT metadata is populated from skb after the packet is\nalready parsed.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "kernel: net: openvswitch: fix overwriting ct original tuple for ICMPv6",
"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": "self",
"summary": "Canonical URL",
"url": "https://access.redhat.com/security/cve/CVE-2024-38558"
},
{
"category": "external",
"summary": "RHBZ#2293441",
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2293441"
},
{
"category": "external",
"summary": "https://www.cve.org/CVERecord?id=CVE-2024-38558",
"url": "https://www.cve.org/CVERecord?id=CVE-2024-38558"
},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2024-38558",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2024-38558"
},
{
"category": "external",
"summary": "https://lore.kernel.org/linux-cve-announce/2024061953-CVE-2024-38558-ddfd@gregkh/T",
"url": "https://lore.kernel.org/linux-cve-announce/2024061953-CVE-2024-38558-ddfd@gregkh/T"
}
],
"release_date": "2024-06-19T00:00:00+00:00",
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{
"category": "vendor_fix",
"date": "2024-10-02T00:38:12+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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}
],
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{
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"attackVector": "LOCAL",
"availabilityImpact": "HIGH",
"baseScore": 5.5,
"baseSeverity": "MEDIUM",
"confidentialityImpact": "NONE",
"integrityImpact": "NONE",
"privilegesRequired": "LOW",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
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"title": "kernel: net: openvswitch: fix overwriting ct original tuple for ICMPv6"
}
]
}
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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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