Description
In the Linux kernel, the following vulnerability has been resolved:
netfilter: bridge: replace physindev with physinif in nf_bridge_info
An skb can be added to a neigh->arp_queue while waiting for an arp
reply. Where original skb's skb->dev can be different to neigh's
neigh->dev. For instance in case of bridging dnated skb from one veth to
another, the skb would be added to a neigh->arp_queue of the bridge.
As skb->dev can be reset back to nf_bridge->physindev and used, and as
there is no explicit mechanism that prevents this physindev from been
freed under us (for instance neigh_flush_dev doesn't cleanup skbs from
different device's neigh queue) we can crash on e.g. this stack:
arp_process
neigh_update
skb = __skb_dequeue(&neigh->arp_queue)
neigh_resolve_output(..., skb)
...
br_nf_dev_xmit
br_nf_pre_routing_finish_bridge_slow
skb->dev = nf_bridge->physindev
br_handle_frame_finish
Let's use plain ifindex instead of net_device link. To peek into the
original net_device we will use dev_get_by_index_rcu(). Thus either we
get device and are safe to use it or we don't get it and drop skb.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| Linux | Linux | 4.2 | 6.1.75 |
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | linux | 6.6.15-1 | — |
| Debian 13 | linux | 6.6.15-1 | — |
| Debian 12 | linux | 6.1.76-1 | — |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu Nvidia-BlueField 22.04 LTS | linux-bluefield | No fix yet | — |
| Ubuntu 22.04 LTS | linux +40 | No fix yet | — |
| Ubuntu 22.04 LTS | linux-azure-6.5 | 6.5.0-1022.23~22.04.1 | USN-6819-1 |
| Ubuntu 22.04 LTS | linux-gcp-6.5 | 6.5.0-1022.24~22.04.1 | USN-6818-1 |
| Ubuntu 22.04 LTS | linux-hwe-6.5 | 6.5.0-41.41~22.04.2 | USN-6818-4 |
| Ubuntu 22.04 LTS | linux-lowlatency-hwe-6.5 | 6.5.0-41.41.1~22.04.1 | USN-6818-1 |
| Ubuntu 22.04 LTS | linux-nvidia-6.5 | 6.5.0-1021.22 | USN-6818-3 |
| Ubuntu 22.04 LTS | linux-oem-6.5 | 6.5.0-1024.25 | USN-6819-3 |
| Ubuntu 22.04 LTS | linux-oracle-6.5 | 6.5.0-1024.24~22.04.1 | USN-6819-4 |
| Ubuntu 22.04 LTS | linux-riscv-6.5 | 6.5.0-40.40.1~22.04.1 | — |
| Ubuntu 22.04 LTS | linux-starfive-6.5 | 6.5.0-1015.16~22.04.1 | USN-6819-1 |
| Ubuntu 20.04 LTS | linux-gke +28 | No fix yet | — |
| Ubuntu 18.04 LTS | linux-gcp +14 | No fix yet | — |
| Ubuntu 16.04 LTS | linux-hwe-edge | No fix yet | — |
Show 14 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu Pro Realtime 24.04 LTS | linux-raspi-realtime | 6.8.0-2001.1 | — |
| Ubuntu Pro Realtime 22.04 LTS | linux-realtime +1 | No fix yet | — |
| Ubuntu Pro FIPS 20.04 LTS | linux-fips +3 | No fix yet | — |
| Ubuntu Pro FIPS 18.04 LTS | linux-fips +3 | No fix yet | — |
| Ubuntu Pro FIPS 16.04 LTS | linux-fips | No fix yet | — |
| Ubuntu Pro FIPS-updates 22.04 LTS | linux-fips +3 | No fix yet | — |
| Ubuntu Pro FIPS-updates 20.04 LTS | linux-fips +3 | No fix yet | — |
| Ubuntu Pro FIPS-updates 18.04 LTS | linux-fips +3 | No fix yet | — |
| Ubuntu Pro FIPS-updates 16.04 LTS | linux-fips | No fix yet | — |
| Ubuntu Pro FIPS-preview 22.04 LTS | linux-fips +3 | No fix yet | — |
| Ubuntu Pro 20.04 LTS | linux +21 | No fix yet | — |
| Ubuntu Pro 18.04 LTS | linux +12 | No fix yet | — |
| Ubuntu Pro 16.04 LTS | linux +7 | No fix yet | — |
| Ubuntu Pro 14.04 LTS | linux-aws +2 | No fix yet | — |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 9 | bpftool | 7.3.0-427.33.1.el9_4 | RHSA-2024:5928 |
| RHEL 9 | rv +64 | 5.14.0-427.33.1.el9_4 | RHSA-2024:5928 |
| RHEL 8 | kernel-rt +12 | 4.18.0-553.27.1.rt7.368.el8_10 | RHSA-2024:8870 |
| RHEL 8 | perf +26 | 4.18.0-553.27.1.el8_10 | RHSA-2024:8856 |
Show 1 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 9.2 EUS | bpftool | 7.0.0-284.82.1.el9_2 | RHSA-2024:6267 |
| RHEL 9.2 EUS | kernel-rt +14 | 5.14.0-284.82.1.rt14.367.el9_2 | RHSA-2024:6268 |
| RHEL 9.2 EUS | perf +47 | 5.14.0-284.82.1.el9_2 | RHSA-2024:6267 |
AlmaLinux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| AlmaLinux 9 | bpftool | 7.3.0-427.33.1.el9_4 | ALSA-2024:5928 |
| AlmaLinux 9 | rv +60 | 5.14.0-427.33.1.el9_4 | ALSA-2024:5928 |
| AlmaLinux 8 | kernel-rt +9 | 4.18.0-553.27.1.rt7.368.el8_10 | ALSA-2024:8870 |
| AlmaLinux 8 | perf +24 | 4.18.0-553.27.1.el8_10 | ALSA-2024:8856 |
Rocky Linux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Rocky Linux 8 | kernel | 4.18.0-553.27.1.el8_10 | RLSA-2024:8856 |
| Rocky Linux 8 | kernel-rt | 4.18.0-553.27.1.rt7.368.el8_10 | RLSA-2024:8870 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 SP6 | kernel-64kb +6 | 6.4.0-150600.23.33.1 | SUSE-SU-2025:0154-1 |
| SLES 15 SP6 | kernel-azure +2 | 6.4.0-150600.8.23.1 | SUSE-SU-2025:0117-1 |
| SLES 15 SP6 | kernel-coco +3 | 6.4.0-15061.12.coco15sp6.1 | SUSE-SU-2025:0289-1 |
| SLES 15 SP6 | kernel-default-base | 6.4.0-150600.23.33.1.150600.12.14.1 | SUSE-SU-2025:0154-1 |
| SLES 12 SP5 | kernel-syms +2 | 4.12.14-122.266.1 | SUSE-SU-2025:02334-1 |
Show 5 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLE Micro 6.1 | kernel-default-base | 6.4.0-24.1.21.4 | SUSE-SU-2025:20248-1 |
| SLE Micro 6.1 | kernel-livepatch-MICRO-6-0-RT_Update_5 | 1-1.1 | SUSE-SU-2025:20249-1 |
| SLE Micro 6.1 | kernel-livepatch-MICRO-6-0_Update_5 | 1-1.2 | SUSE-SU-2025:20248-1 |
| SLE Micro 6.1 | kernel-rt +4 | 6.4.0-25.1 | SUSE-SU-2025:20249-1, SUSE-SU-2025:20248-1 |
| SLE Micro 6.0 | kernel-default-base | 6.4.0-24.1.21.4 | SUSE-SU-2025:20165-1 |
| SLE Micro 6.0 | kernel-livepatch-MICRO-6-0-RT_Update_5 | 1-1.1 | SUSE-SU-2025:20166-1 |
| SLE Micro 6.0 | kernel-livepatch-MICRO-6-0_Update_5 | 1-1.2 | SUSE-SU-2025:20165-1 |
| SLE Micro 6.0 | kernel-rt +4 | 6.4.0-25.1 | SUSE-SU-2025:20166-1, SUSE-SU-2025:20165-1 |
| SLE Live Patching 15 SP6 | kernel-default | 6.4.0-150600.23.33.1 | SUSE-SU-2025:0154-1 |
| SLE Live Patching 15 SP6 | kernel-livepatch-SLE15-SP6-RT_Update_7 | 1-150600.1.3.1 | SUSE-SU-2025:0153-1 |
| SLE Live Patching 15 SP6 | kernel-livepatch-SLE15-SP6_Update_7 | 1-150600.13.3.1 | SUSE-SU-2025:0154-1 |
| SLE Live Patching 12 SP5 | kernel-default | 4.12.14-122.266.1 | SUSE-SU-2025:02334-1 |
| SLE Live Patching 12 SP5 | kgraft-patch-SLE12-SP5_Update_70 | 1-8.5.1 | SUSE-SU-2025:02334-1 |
| SUSE Real Time Module 15 SP6 | kernel-rt +3 | 6.4.0-150600.10.23.1 | SUSE-SU-2025:0153-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Leap 15.6 | dtb-aarch64 +10 | 6.4.0-150600.23.33.1 | SUSE-SU-2025:0154-1 |
| openSUSE Leap 15.6 | kernel-azure +2 | 6.4.0-150600.8.23.1 | SUSE-SU-2025:0117-1 |
| openSUSE Leap 15.6 | kernel-default-base | 6.4.0-150600.23.33.1.150600.12.14.1 | SUSE-SU-2025:0154-1 |
| openSUSE Leap 15.6 | kernel-rt +3 | 6.4.0-150600.10.23.1 | SUSE-SU-2025:0153-1 |
Amazon Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Amazon Linux 2023 | kernel-livepatch-6.1.75-99.163 | 1.0-0.amzn2023 | ALAS2023-2024-519 |
| Amazon Linux 2023 | perf +14 | 6.1.75-99.163.amzn2023 | ALAS2023-2024-519 |
Azure Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Azure Linux 2 (CBL-Mariner) | kernel | No fix yet | — |
Oracle Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Oracle Linux 9 | bpftool | 7.3.0-427.33.1.el9_4 | ELSA-2024-5928 |
| Oracle Linux 9 | rv +27 | 5.14.0-427.33.1.el9_4 | ELSA-2024-5928 |
| Oracle Linux 8 | perf +19 | 4.18.0-553.27.1.el8_10 | ELSA-2024-8856 |
Advisories 29
- WID-SEC-2024-1188 Linux Kernel: Mehrere Schwachstellen ermöglichen Denial of Service BSI CERT-Bund (WID) · Nov 9, 2026
- USN-6819-4 linux-oracle-6.5 vulnerabilities Ubuntu Security Notices (USN) · Nov 3, 2026
- USN-6818-3 linux-nvidia-6.5 vulnerabilities Ubuntu Security Notices (USN) · Nov 3, 2026
- USN-6819-3 linux-oem-6.5 vulnerabilities Ubuntu Security Notices (USN) · Nov 3, 2026
- USN-6818-1 linux, linux-gcp, linux-gcp-6.5, linux-lowlatency, linux-lowlatency-hwe-6.5, linux-raspi vulnerabilities Ubuntu Security Notices (USN) · Nov 3, 2026
- USN-6818-4 linux-hwe-6.5 vulnerabilities Ubuntu Security Notices (USN) · Nov 3, 2026
- USN-6819-1 linux-azure, linux-azure-6.5, linux-starfive, linux-starfive-6.5 vulnerabilities Ubuntu Security Notices (USN) · Nov 3, 2026
- ALSA-2024:5928 Important: kernel security update AlmaLinux Security Advisories · Oct 29, 2026
- ALSA-2024:8856 Moderate: kernel security update AlmaLinux Security Advisories · Oct 29, 2026
- ALSA-2024:8870 Moderate: kernel-rt security update AlmaLinux Security Advisories · Oct 29, 2026
- RHSA-2024:8870 Red Hat Security Advisory: kernel-rt security update Red Hat Security Advisories (RHSA) · Oct 17, 2026
- RHSA-2024:8856 Red Hat Security Advisory: kernel security update Red Hat Security Advisories (RHSA) · Oct 17, 2026
- RHSA-2024:5928 Red Hat Security Advisory: kernel security update Red Hat Security Advisories (RHSA) · Sep 13, 2026
- RHSA-2024:6267 Red Hat Security Advisory: kernel security update Red Hat Security Advisories (RHSA) · Aug 20, 2026
- RHSA-2024:6268 Red Hat Security Advisory: kernel-rt security update Red Hat Security Advisories (RHSA) · Aug 20, 2026
- SUSE-SU-2025:20165-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Mar 23, 2026
- SUSE-SU-2025:20166-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Mar 23, 2026
- SUSE-SU-2025:20248-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Mar 23, 2026
- SUSE-SU-2025:20249-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Mar 23, 2026
- SUSE-SU-2025:02334-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Mar 23, 2026
- RLSA-2024:8856 Moderate: kernel security update Rocky Linux Security Advisories · Feb 5, 2026
- RLSA-2024:8870 Moderate: kernel-rt security update Rocky Linux Security Advisories · Feb 5, 2026
- SUSE-SU-2025:0117-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2025:0153-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2025:0154-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2025:0289-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- ALAS2023-2024-519 Important: kernel security update (Amazon Linux 2023) Amazon Linux Security Center (ALAS) · Dec 5, 2024
- ELSA-2024-8856 Moderate: kernel security update (Oracle Linux 8) Oracle Linux Security Advisories (ELSA) · Nov 5, 2024
- ELSA-2024-5928 Important: kernel security update (Oracle Linux 9) Oracle Linux Security Advisories (ELSA) · Aug 28, 2024