netfilter: br_netfilter: skip conntrack input hook for promisc packets
In the Linux kernel, the following vulnerability has been resolved: netfilter: br_netfilter: skip conntrack input hook for promisc packets For historical reasons, when bridge device is in promisc mode, packets that are directed to the taps follow bridge input hook path. This patch adds a workaround to reset conntrack for these packets. Jianbo Liu reports warning splats in their test infrastructure where cloned packets reach the br_netfilter input hook to confirm the conntrack object. Scratch one bit from BR_INPUT_SKB_CB to annotate that this packet has reached the input hook because it is passed up to the bridge device to reach the taps. [ 57.571874] WARNING: CPU: 1 PID: 0 at net/bridge/br_netfilter_hooks.c:616 br_nf_local_in+0x157/0x180 [br_netfilter] [ 57.572749] Modules linked in: xt_MASQUERADE nf_conntrack_netlink nfnetlink iptable_nat xt_addrtype xt_conntrack nf_nat br_netfilter rpcsec_gss_krb5 auth_rpcgss oid_registry overlay rpcrdma rdma_ucm ib_iser libiscsi scsi_transport_isc si ib_umad rdma_cm ib_ipoib iw_cm ib_cm mlx5_ib ib_uverbs ib_core mlx5ctl mlx5_core [ 57.575158] CPU: 1 PID: 0 Comm: swapper/1 Not tainted 6.8.0+ #19 [ 57.575700] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS rel-1.13.0-0-gf21b5a4aeb02-prebuilt.qemu.org 04/01/2014 [ 57.576662] RIP: 0010:br_nf_local_in+0x157/0x180 [br_netfilter] [ 57.577195] Code: fe ff ff 41 bd 04 00 00 00 be 04 00 00 00 e9 4a ff ff ff be 04 00 00 00 48 89 ef e8 f3 a9 3c e1 66 83 ad b4 00 00 00 04 eb 91 <0f> 0b e9 f1 fe ff ff 0f 0b e9 df fe ff ff 48 89 df e8 b3 53 47 e1 [ 57.578722] RSP: 0018:ffff88885f845a08 EFLAGS: 00010202 [ 57.579207] RAX: 0000000000000002 RBX: ffff88812dfe8000 RCX: 0000000000000000 [ 57.579830] RDX: ffff88885f845a60 RSI: ffff8881022dc300 RDI: 0000000000000000 [ 57.580454] RBP: ffff88885f845a60 R08: 0000000000000001 R09: 0000000000000003 [ 57.581076] R10: 00000000ffff1300 R11: 0000000000000002 R12: 0000000000000000 [ 57.581695] R13: ffff8881047ffe00 R14: ffff888108dbee00 R15: ffff88814519b800 [ 57.582313] FS: 0000000000000000(0000) GS:ffff88885f840000(0000) knlGS:0000000000000000 [ 57.583040] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 57.583564] CR2: 000000c4206aa000 CR3: 0000000103847001 CR4: 0000000000370eb0 [ 57.584194] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 57.584820] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 57.585440] Call Trace: [ 57.585721] <IRQ> [ 57.585976] ? __warn+0x7d/0x130 [ 57.586323] ? br_nf_local_in+0x157/0x180 [br_netfilter] [ 57.586811] ? report_bug+0xf1/0x1c0 [ 57.587177] ? handle_bug+0x3f/0x70 [ 57.587539] ? exc_invalid_op+0x13/0x60 [ 57.587929] ? asm_exc_invalid_op+0x16/0x20 [ 57.588336] ? br_nf_local_in+0x157/0x180 [br_netfilter] [ 57.588825] nf_hook_slow+0x3d/0xd0 [ 57.589188] ? br_handle_vlan+0x4b/0x110 [ 57.589579] br_pass_frame_up+0xfc/0x150 [ 57.589970] ? br_port_flags_change+0x40/0x40 [ 57.590396] br_handle_frame_finish+0x346/0x5e0 [ 57.590837] ? ipt_do_table+0x32e/0x430 [ 57.591221] ? br_handle_local_finish+0x20/0x20 [ 57.591656] br_nf_hook_thresh+0x4b/0xf0 [br_netfilter] [ 57.592286] ? br_handle_local_finish+0x20/0x20 [ 57.592802] br_nf_pre_routing_finish+0x178/0x480 [br_netfilter] [ 57.593348] ? br_handle_local_finish+0x20/0x20 [ 57.593782] ? nf_nat_ipv4_pre_routing+0x25/0x60 [nf_nat] [ 57.594279] br_nf_pre_routing+0x24c/0x550 [br_netfilter] [ 57.594780] ? br_nf_hook_thresh+0xf0/0xf0 [br_netfilter] [ 57.595280] br_handle_frame+0x1f3/0x3d0 [ 57.595676] ? br_handle_local_finish+0x20/0x20 [ 57.596118] ? br_handle_frame_finish+0x5e0/0x5e0 [ 57.596566] __netif_receive_skb_core+0x25b/0xfc0 [ 57.597017] ? __napi_build_skb+0x37/0x40 [ 57.597418] __netif_receive_skb_list_core+0xfb/0x220
- Published
- May 1, 2024
- Updated
- Aug 5, 2026
- EPSS
- 0.6% · 49th percentile
- CWE
- —
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Report tools
Action score
31
Monitor
Low priority for now.
- CVSS
- 31 / 40 · 7.8 / 10
- CISA KEV
- 0 / 30 · Not listed
- EPSS
- 0 / 30 · 0.6%
CISA SSVC decision
- Exploitation
- none
- Automatable
- no
- Technical impact
- partial
Vulnrichment: CISA's decision-tree inputs.
CNA vs NVD score
- NVD
- 7.8
- CNA · Linux
- 8.2
- 0.4 point gap
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H
The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.
Noroxi analysis
No Noroxi analysis for this record yet
We don't hand-write analysis for the hundreds of thousands of vulnerabilities in the database; that wouldn't be honest. For notable, high-impact vulnerabilities our team writes the mechanism, detection and remediation steps.
We use this product, ask for helpAffected systems
| Vendor | Product | CPE |
|---|---|---|
| linux | linux kernel | cpe:2.3:o:linux:linux_kernel |
| fedoraproject | fedora | cpe:2.3:o:fedoraproject:fedora |
Affected versions
NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.
- fedoraproject fedora38
- fedoraproject fedora39
- fedoraproject fedora40
- linux linux kernel6.7.9 and later · before 6.8.8
- linux linux kernel5.15.151 and later · before 5.15.157
- linux linux kernel6.1.81 and later · before 6.1.88
- linux linux kernel6.6.21 and later · before 6.6.29
- linux linux kernel6.9
Versions reported by the vendor
Affected version ranges reported by the assigning authority (Linux). Independent of NVD's CPE analysis and usually ahead of it.
Linux Linux
- cb734975b0ffa688ff6cc0eed463865bf07b6c01, 6.8affected
- 7c3f28599652acf431a2211168de4a583f30b6d5 and later · before dceb683ab87ca3666a9bb5c0158528b646faedc4affected · git
- 2b1414d5e94e477edff1d2c79030f1d742625ea0 and later · before b13db0d16bc7b2a52abcf5cb71334f63faa5dbd6affected · git
- 80cd0487f630b5382734997c3e5e3003a77db315 and later · before 3f59ac29dea0921637053908fe99268d157bbb9daffected · git
- 62e7151ae3eb465e0ab52a20c941ff33bb6332e9 and later · before 43193174510ea4f3ce09b796e559a2fd9f148615affected · git
- 62e7151ae3eb465e0ab52a20c941ff33bb6332e9 and later · before 751de2012eafa4d46d8081056761fa0e9cc8a178affected · git
- 5.15.151 and later · before 5.15.157affected · semver
- 6.1.81 and later · before 6.1.88affected · semver
- 6.6.21 and later · before 6.6.29affected · semver
- 6.7.9 and later · before 6.8affected · semver
Package-level exposure
OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.
| Ecosystem | Package | Affected range | Fix |
|---|---|---|---|
| Debian:12 | linux | before 6.1.90-1 | 6.1.90-1 |
| Debian:13 | linux | before 6.8.9-1 | 6.8.9-1 |
| openSUSE:Leap 15.6 | dtb-aarch64 | before 6.4.0-150600.23.50.1 | 6.4.0-150600.23.50.1 |
| openSUSE:Leap 15.6 | kernel-debug | before 6.4.0-150600.23.50.1 | 6.4.0-150600.23.50.1 |
| openSUSE:Leap 15.6 | kernel-kvmsmall | before 6.4.0-150600.23.50.1 | 6.4.0-150600.23.50.1 |
| openSUSE:Leap 15.6 | kernel-obs-qa | before 6.4.0-150600.23.50.1 | 6.4.0-150600.23.50.1 |
| SUSE:Linux Enterprise Live Patching 15 SP6 | kernel-livepatch-SLE15-SP6_Update_11 | before 1-150600.13.3.1 | 1-150600.13.3.1 |
| SUSE:Linux Enterprise Live Patching 15 SP6 | kernel-livepatch-SLE15-SP6_Update_11 | before 1-150600.13.3.1 | 1-150600.13.3.1 |
| SUSE:Linux Enterprise Live Patching 15 SP6 | kernel-livepatch-SLE15-SP6-RT_Update_11 | before 1-150600.1.3.2 | 1-150600.1.3.2 |
| SUSE:Linux Enterprise Live Patching 15 SP6 | kernel-livepatch-SLE15-SP6-RT_Update_11 | before 1-150600.1.3.2 | 1-150600.1.3.2 |
| SUSE:Linux Enterprise Live Patching 15 SP7 | kernel-livepatch-SLE15-SP7_Update_1 | before 1-150700.15.3.1 | 1-150700.15.3.1 |
| SUSE:Linux Enterprise Live Patching 15 SP7 | kernel-livepatch-SLE15-SP7-RT_Update_1 | before 1-150700.1.3.1 | 1-150700.1.3.1 |
| SUSE:Linux Enterprise Module for Basesystem 15 SP6 | kernel-64kb | before 6.4.0-150600.23.50.1 | 6.4.0-150600.23.50.1 |
| SUSE:Linux Enterprise Module for Basesystem 15 SP6 | kernel-64kb | before 6.4.0-150600.23.50.1 | 6.4.0-150600.23.50.1 |
| SUSE:Linux Enterprise Module for Basesystem 15 SP6 | kernel-default | before 6.4.0-150600.23.50.1 | 6.4.0-150600.23.50.1 |
| SUSE:Linux Enterprise Module for Basesystem 15 SP6 | kernel-default | before 6.4.0-150600.23.50.1 | 6.4.0-150600.23.50.1 |
| SUSE:Linux Enterprise Module for Basesystem 15 SP6 | kernel-default-base | before 6.4.0-150600.23.50.1.150600.12.22.1 | 6.4.0-150600.23.50.1.150600.12.22.1 |
| SUSE:Linux Enterprise Module for Basesystem 15 SP6 | kernel-default-base | before 6.4.0-150600.23.50.1.150600.12.22.1 | 6.4.0-150600.23.50.1.150600.12.22.1 |
| SUSE:Linux Enterprise Module for Basesystem 15 SP6 | kernel-source | before 6.4.0-150600.23.50.1 | 6.4.0-150600.23.50.1 |
| SUSE:Linux Enterprise Module for Basesystem 15 SP6 | kernel-source | before 6.4.0-150600.23.50.1 | 6.4.0-150600.23.50.1 |
| SUSE:Linux Enterprise Module for Basesystem 15 SP6 | kernel-zfcpdump | before 6.4.0-150600.23.50.1 | 6.4.0-150600.23.50.1 |
| SUSE:Linux Enterprise Module for Basesystem 15 SP6 | kernel-zfcpdump | before 6.4.0-150600.23.50.1 | 6.4.0-150600.23.50.1 |
| SUSE:Linux Enterprise Module for Basesystem 15 SP7 | kernel-64kb | before 6.4.0-150700.53.3.1 | 6.4.0-150700.53.3.1 |
| SUSE:Linux Enterprise Module for Basesystem 15 SP7 | kernel-default | before 6.4.0-150700.53.3.1 | 6.4.0-150700.53.3.1 |
+45
Same product
linux: all recordsOther highest-scoring records for the same primary product.
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- CVE-2021-22555Heap Out-Of-Bounds Write in Netfilter IP6T_SO_SET_REPLACEKEV85Now
- CVE-2016-5195Race condition in mm/gup.c in the Linux kernel 2.x through 4.x before 4.8.3 allows local users to gain privileges by leveraging incorrect haKEV83Now
- CVE-2019-13272In the Linux kernel before 5.1.17, ptrace_link in kernel/ptrace.c mishandles the recording of the credentials of a process that wants to creKEV77This week
- CVE-2013-6282The (1) get_user and (2) put_user API functions in the Linux kernel before 3.5.5 on the v6k and v7 ARM platforms do not validate certain addKEV77This week
- CVE-2013-2094The perf_swevent_init function in kernel/events/core.c in the Linux kernel before 3.8.9 uses an incorrect integer data type, which allows loKEV77This week
Remediation
Which version to upgrade to
Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.
| Product / package | Fixed version | Source |
|---|---|---|
| Linux Linux | 3f59ac29dea0921637053908fe99268d157bbb9d | Vendor (CNA) |
| Linux Linux | 43193174510ea4f3ce09b796e559a2fd9f148615 | Vendor (CNA) |
| Linux Linux | 5.15.157 | Vendor (CNA) |
| Linux Linux | 6.1.88 | Vendor (CNA) |
| Linux Linux | 6.6.29 | Vendor (CNA) |
| Linux Linux | 6.8 | Vendor (CNA) |
| Linux Linux | 751de2012eafa4d46d8081056761fa0e9cc8a178 | Vendor (CNA) |
| Linux Linux | b13db0d16bc7b2a52abcf5cb71334f63faa5dbd6 | Vendor (CNA) |
| Linux Linux | dceb683ab87ca3666a9bb5c0158528b646faedc4 | Vendor (CNA) |
| azl3 hyperv-daemons 6.6.22.1-2 on Azure Linux 3.0 | 6.6.35.1-1 · CBL-Mariner Releases | Microsoft (MSRC) |
| azl3 hyperv-daemons 6.6.35.1-1 on Azure Linux 3.0 | 6.6.35.1-1 · CBL-Mariner Releases | Microsoft (MSRC) |
| azl3 kernel 6.6.22.1-2 on Azure Linux 3.0 | 6.6.35.1-5 · CBL-Mariner Releases | Microsoft (MSRC) |
| azl3 kernel 6.6.35.1-5 on Azure Linux 3.0 | - · CBL-Mariner Releases | Microsoft (MSRC) |
| cbl2 hyperv-daemons 5.15.158.1-1 on CBL Mariner 2.0 | 5.15.158.1-1 · CBL-Mariner Releases | Microsoft (MSRC) |
| cbl2 hyperv-daemons 5.15.180.1-1 on CBL Mariner 2.0 | 5.15.158.1-1 · CBL-Mariner Releases | Microsoft (MSRC) |
| cbl2 kernel 5.15.153.1-2 on CBL Mariner 2.0 | 5.15.158.1-1 · CBL-Mariner Releases | Microsoft (MSRC) |
| cbl2 kernel 5.15.158.1-1 on CBL Mariner 2.0 | 5.15.158.1-1 · CBL-Mariner Releases | Microsoft (MSRC) |
| debian:linux | 6.1.90-1 · Debian:12 | Package registry (OSV) |
| opensuse:dtb-aarch64 | 6.4.0-150600.23.50.1 · openSUSE:Leap 15.6 | Package registry (OSV) |
| opensuse:kernel-64kb | 6.4.0-150600.23.50.1 · openSUSE:Leap 15.6 | Package registry (OSV) |
| opensuse:kernel-debug | 6.4.0-150600.23.50.1 · openSUSE:Leap 15.6 | Package registry (OSV) |
| suse:kernel-64kb | 6.4.0-150600.23.50.1 · SUSE:Linux Enterprise Module for Basesystem 15 SP6 | Package registry (OSV) |
| suse:kernel-default | 6.4.0-150600.23.50.1 · SUSE:Linux Enterprise Module for Basesystem 15 SP6 | Package registry (OSV) |
| suse:kernel-default-base | 6.4.0-150600.23.50.1.150600.12.22.1 · SUSE:Linux Enterprise Module for Basesystem 15 SP6 | Package registry (OSV) |
| suse:kernel-docs | 6.4.0-150600.23.50.1 · SUSE:Linux Enterprise Module for Development Tools 15 SP6 | Package registry (OSV) |
| suse:kernel-livepatch-SLE15-SP6_Update_11 | 1-150600.13.3.1 · SUSE:Linux Enterprise Live Patching 15 SP6 | Package registry (OSV) |
| suse:kernel-obs-build | 6.4.0-150600.23.50.1 · SUSE:Linux Enterprise Module for Development Tools 15 SP6 | Package registry (OSV) |
| suse:kernel-source | 6.4.0-150600.23.50.1 · SUSE:Linux Enterprise Module for Basesystem 15 SP6 | Package registry (OSV) |
| suse:kernel-syms | 6.4.0-150600.23.50.1 · SUSE:Linux Enterprise Module for Development Tools 15 SP6 | Package registry (OSV) |
| suse:kernel-zfcpdump | 6.4.0-150600.23.50.1 · SUSE:Linux Enterprise Module for Basesystem 15 SP6 | Package registry (OSV) |
Exploit status
No known public exploit
No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.
Research context
For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.
Timeline
From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.
No dated events beyond publication.
FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).
Patch and commit links
Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.
No commit or PR link among the references.
Credits
All researchersFinders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.
No credits in the CNA record.
Variant candidates
Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.
No nightly-computed relations.
Chain candidates
An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.
—
Bug bounty scope
No known public program.
Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).
National notice (Türkiye Cybersecurity Directorate / USOM)
Official security notices citing this record; remediation advice is on the agency's page.
- TR-24-0387 · May 2, 2024(Linux Kernel Güncellemesi)
Technical details
Attack conditions
- Someone with local access to the system can trigger it.
- A low-privileged account is enough.
- No user action is required.
- No special conditions are required; it is repeatable.
If successful
- Confidentiality
- high · data can be read
- Integrity
- high · data or configuration can be modified
- Availability
- high · the service can be disrupted
- Attack vector
- Local
- Attack complexity
- Low
- Privileges required
- Low
- User interaction
- None
- Scope
- Unchanged
- Confidentiality impact
- High
- Integrity impact
- High
- Availability impact
- High
Weakness class (CWE)
—
CVSS vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
nvd-primary
Attack context
MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.
MITRE has no CAPEC/ATT&CK mapping for this CWE.
Change log
- Fix✗ → ✓
For records you follow, these changes also arrive as notifications. →
References
- git.kernel.org/stable/c/3f59ac29dea0921637053908fe99268d157bbb9d
- git.kernel.org/stable/c/43193174510ea4f3ce09b796e559a2fd9f148615
- git.kernel.org/stable/c/751de2012eafa4d46d8081056761fa0e9cc8a178
- git.kernel.org/stable/c/b13db0d16bc7b2a52abcf5cb71334f63faa5dbd6
- git.kernel.org/stable/c/dceb683ab87ca3666a9bb5c0158528b646faedc4
- lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/4EZ6PJW7VOZ224TD7N4JZNU6KV32ZJ53/
- lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/DAMSOZXJEPUOXW33WZYWCVAY7Z5S7OOY/
- lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/GCBZZEC7L7KTWWAS2NLJK6SO3IZIL4WW/
Vendor advisories and official records. Exploit/PoC links are deliberately left out.