rhsa-2024_7490
Vulnerability from csaf_redhat
Published
2024-10-02 00:38
Modified
2024-11-06 07:08
Summary
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 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.
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"cve": "CVE-2024-27415",
"discovery_date": "2024-05-17T00:00:00+00:00",
"ids": [
{
"system_name": "Red Hat Bugzilla ID",
"text": "2281101"
}
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{
"category": "description",
"text": "In the Linux kernel, the following vulnerability has been resolved:\n\nnetfilter: bridge: confirm multicast packets before passing them up the stack\n\nconntrack nf_confirm logic cannot handle cloned skbs referencing\nthe same nf_conn entry, which will happen for multicast (broadcast)\nframes on bridges.\n\n Example:\n macvlan0\n |\n br0\n / \\\n ethX ethY\n\n ethX (or Y) receives a L2 multicast or broadcast packet containing\n an IP packet, flow is not yet in conntrack table.\n\n 1. skb passes through bridge and fake-ip (br_netfilter)Prerouting.\n -\u003e skb-\u003e_nfct now references a unconfirmed entry\n 2. skb is broad/mcast packet. bridge now passes clones out on each bridge\n interface.\n 3. skb gets passed up the stack.\n 4. In macvlan case, macvlan driver retains clone(s) of the mcast skb\n and schedules a work queue to send them out on the lower devices.\n\n The clone skb-\u003e_nfct is not a copy, it is the same entry as the\n original skb. The macvlan rx handler then returns RX_HANDLER_PASS.\n 5. Normal conntrack hooks (in NF_INET_LOCAL_IN) confirm the orig skb.\n\nThe Macvlan broadcast worker and normal confirm path will race.\n\nThis race will not happen if step 2 already confirmed a clone. In that\ncase later steps perform skb_clone() with skb-\u003e_nfct already confirmed (in\nhash table). This works fine.\n\nBut such confirmation won\u0027t happen when eb/ip/nftables rules dropped the\npackets before they reached the nf_confirm step in postrouting.\n\nPablo points out that nf_conntrack_bridge doesn\u0027t allow use of stateful\nnat, so we can safely discard the nf_conn entry and let inet call\nconntrack again.\n\nThis doesn\u0027t work for bridge netfilter: skb could have a nat\ntransformation. Also bridge nf prevents re-invocation of inet prerouting\nvia \u0027sabotage_in\u0027 hook.\n\nWork around this problem by explicit confirmation of the entry at LOCAL_IN\ntime, before upper layer has a chance to clone the unconfirmed entry.\n\nThe downside is that this disables NAT and conntrack helpers.\n\nAlternative fix would be to add locking to all code parts that deal with\nunconfirmed packets, but even if that could be done in a sane way this\nopens up other problems, for example:\n\n-m physdev --physdev-out eth0 -j SNAT --snat-to 1.2.3.4\n-m physdev --physdev-out eth1 -j SNAT --snat-to 1.2.3.5\n\nFor multicast case, only one of such conflicting mappings will be\ncreated, conntrack only handles 1:1 NAT mappings.\n\nUsers should set create a setup that explicitly marks such traffic\nNOTRACK (conntrack bypass) to avoid this, but we cannot auto-bypass\nthem, ruleset might have accept rules for untracked traffic already,\nso user-visible behaviour would change.",
"title": "Vulnerability description"
},
{
"category": "summary",
"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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"url": "https://www.cve.org/CVERecord?id=CVE-2024-36270"
},
{
"category": "external",
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"url": "https://nvd.nist.gov/vuln/detail/CVE-2024-36270"
},
{
"category": "external",
"summary": "https://lore.kernel.org/linux-cve-announce/2024062135-CVE-2024-36270-f7f7@gregkh/T",
"url": "https://lore.kernel.org/linux-cve-announce/2024062135-CVE-2024-36270-f7f7@gregkh/T"
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"release_date": "2024-06-21T00:00:00+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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"id": "CWE-416",
"name": "Use After Free"
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"notes": [
{
"category": "description",
"text": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: bridge: mst: fix vlan use-after-free\n\nsyzbot reported a suspicious rcu usage[1] in bridge\u0027s mst code. While\nfixing it I noticed that nothing prevents a vlan to be freed while\nwalking the list from the same path (br forward delay timer). Fix the rcu\nusage and also make sure we are not accessing freed memory by making\nbr_mst_vlan_set_state use rcu read lock.\n\n[1]\n WARNING: suspicious RCU usage\n 6.9.0-rc6-syzkaller #0 Not tainted\n -----------------------------\n net/bridge/br_private.h:1599 suspicious rcu_dereference_protected() usage!\n ...\n stack backtrace:\n CPU: 1 PID: 8017 Comm: syz-executor.1 Not tainted 6.9.0-rc6-syzkaller #0\n Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024\n Call Trace:\n \u003cIRQ\u003e\n __dump_stack lib/dump_stack.c:88 [inline]\n dump_stack_lvl+0x241/0x360 lib/dump_stack.c:114\n lockdep_rcu_suspicious+0x221/0x340 kernel/locking/lockdep.c:6712\n nbp_vlan_group net/bridge/br_private.h:1599 [inline]\n br_mst_set_state+0x1ea/0x650 net/bridge/br_mst.c:105\n br_set_state+0x28a/0x7b0 net/bridge/br_stp.c:47\n br_forward_delay_timer_expired+0x176/0x440 net/bridge/br_stp_timer.c:88\n call_timer_fn+0x18e/0x650 kernel/time/timer.c:1793\n expire_timers kernel/time/timer.c:1844 [inline]\n __run_timers kernel/time/timer.c:2418 [inline]\n __run_timer_base+0x66a/0x8e0 kernel/time/timer.c:2429\n run_timer_base kernel/time/timer.c:2438 [inline]\n run_timer_softirq+0xb7/0x170 kernel/time/timer.c:2448\n __do_softirq+0x2c6/0x980 kernel/softirq.c:554\n invoke_softirq kernel/softirq.c:428 [inline]\n __irq_exit_rcu+0xf2/0x1c0 kernel/softirq.c:633\n irq_exit_rcu+0x9/0x30 kernel/softirq.c:645\n instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1043 [inline]\n sysvec_apic_timer_interrupt+0xa6/0xc0 arch/x86/kernel/apic/apic.c:1043\n \u003c/IRQ\u003e\n \u003cTASK\u003e\n asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702\n RIP: 0010:lock_acquire+0x264/0x550 kernel/locking/lockdep.c:5758\n Code: 2b 00 74 08 4c 89 f7 e8 ba d1 84 00 f6 44 24 61 02 0f 85 85 01 00 00 41 f7 c7 00 02 00 00 74 01 fb 48 c7 44 24 40 0e 36 e0 45 \u003c4b\u003e c7 44 25 00 00 00 00 00 43 c7 44 25 09 00 00 00 00 43 c7 44 25\n RSP: 0018:ffffc90013657100 EFLAGS: 00000206\n RAX: 0000000000000001 RBX: 1ffff920026cae2c RCX: 0000000000000001\n RDX: dffffc0000000000 RSI: ffffffff8bcaca00 RDI: ffffffff8c1eaa60\n RBP: ffffc90013657260 R08: ffffffff92efe507 R09: 1ffffffff25dfca0\n R10: dffffc0000000000 R11: fffffbfff25dfca1 R12: 1ffff920026cae28\n R13: dffffc0000000000 R14: ffffc90013657160 R15: 0000000000000246",
"title": "Vulnerability description"
},
{
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"text": "kernel: net: bridge: mst: fix vlan use-after-free",
"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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"url": "https://nvd.nist.gov/vuln/detail/CVE-2024-36979"
},
{
"category": "external",
"summary": "https://lore.kernel.org/linux-cve-announce/2024061945-CVE-2024-36979-b4a6@gregkh/T",
"url": "https://lore.kernel.org/linux-cve-announce/2024061945-CVE-2024-36979-b4a6@gregkh/T"
}
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{
"cve": "CVE-2024-38558",
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"id": "CWE-665",
"name": "Improper Initialization"
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{
"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"
}
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"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",
"version": "3.1"
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"title": "kernel: net: openvswitch: fix overwriting ct original tuple for ICMPv6"
}
]
}
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- Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
- Confirmed: The vulnerability is confirmed from an analyst perspective.
- Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
- Patched: This vulnerability was successfully patched by the user reporting the sighting.
- Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
- Not confirmed: The user expresses doubt about the veracity of the vulnerability.
- Not patched: This vulnerability was not successfully patched by the user reporting the sighting.