In the Linux kernel, the following vulnerability has been resolved:
net: tunnels: annotate lockless accesses to dev->needed_headroom
IP tunnels can apparently update dev->needed_headroom in their xmit path.
This patch takes care of three tunnels xmit, and also the core LL_RESERVED_SPACE() and LL_RESERVED_SPACE_EXTRA() helpers.
More changes might be needed for completeness.
BUG: KCSAN: data-race in ip_tunnel_xmit / ip_tunnel_xmit
read to 0xffff88815b9da0ec of 2 bytes by task 888 on cpu 1: ip_tunnel_xmit+0x1270/0x1730 net/ipv4/ip_tunnel.c:803 __gre_xmit net/ipv4/ip_gre.c:469 [inline] ipgre_xmit+0x516/0x570 net/ipv4/ip_gre.c:661 __netdev_start_xmit include/linux/netdevice.h:4881 [inline] netdev_start_xmit include/linux/netdevice.h:4895 [inline] xmit_one net/core/dev.c:3580 [inline] dev_hard_start_xmit+0x127/0x400 net/core/dev.c:3596 __dev_queue_xmit+0x1007/0x1eb0 net/core/dev.c:4246 dev_queue_xmit include/linux/netdevice.h:3051 [inline] neigh_direct_output+0x17/0x20 net/core/neighbour.c:1623 neigh_output include/net/neighbour.h:546 [inline] ip_finish_output2+0x740/0x840 net/ipv4/ip_output.c:228 ip_finish_output+0xf4/0x240 net/ipv4/ip_output.c:316 NF_HOOK_COND include/linux/netfilter.h:291 [inline] ip_output+0xe5/0x1b0 net/ipv4/ip_output.c:430 dst_output include/net/dst.h:444 [inline] ip_local_out+0x64/0x80 net/ipv4/ip_output.c:126 iptunnel_xmit+0x34a/0x4b0 net/ipv4/ip_tunnel_core.c:82 ip_tunnel_xmit+0x1451/0x1730 net/ipv4/ip_tunnel.c:813 __gre_xmit net/ipv4/ip_gre.c:469 [inline] ipgre_xmit+0x516/0x570 net/ipv4/ip_gre.c:661 __netdev_start_xmit include/linux/netdevice.h:4881 [inline] netdev_start_xmit include/linux/netdevice.h:4895 [inline] xmit_one net/core/dev.c:3580 [inline] dev_hard_start_xmit+0x127/0x400 net/core/dev.c:3596 __dev_queue_xmit+0x1007/0x1eb0 net/core/dev.c:4246 dev_queue_xmit include/linux/netdevice.h:3051 [inline] neigh_direct_output+0x17/0x20 net/core/neighbour.c:1623 neigh_output include/net/neighbour.h:546 [inline] ip_finish_output2+0x740/0x840 net/ipv4/ip_output.c:228 ip_finish_output+0xf4/0x240 net/ipv4/ip_output.c:316 NF_HOOK_COND include/linux/netfilter.h:291 [inline] ip_output+0xe5/0x1b0 net/ipv4/ip_output.c:430 dst_output include/net/dst.h:444 [inline] ip_local_out+0x64/0x80 net/ipv4/ip_output.c:126 iptunnel_xmit+0x34a/0x4b0 net/ipv4/ip_tunnel_core.c:82 ip_tunnel_xmit+0x1451/0x1730 net/ipv4/ip_tunnel.c:813 __gre_xmit net/ipv4/ip_gre.c:469 [inline] ipgre_xmit+0x516/0x570 net/ipv4/ip_gre.c:661 __netdev_start_xmit include/linux/netdevice.h:4881 [inline] netdev_start_xmit include/linux/netdevice.h:4895 [inline] xmit_one net/core/dev.c:3580 [inline] dev_hard_start_xmit+0x127/0x400 net/core/dev.c:3596 __dev_queue_xmit+0x1007/0x1eb0 net/core/dev.c:4246 dev_queue_xmit include/linux/netdevice.h:3051 [inline] neigh_direct_output+0x17/0x20 net/core/neighbour.c:1623 neigh_output include/net/neighbour.h:546 [inline] ip_finish_output2+0x740/0x840 net/ipv4/ip_output.c:228 ip_finish_output+0xf4/0x240 net/ipv4/ip_output.c:316 NF_HOOK_COND include/linux/netfilter.h:291 [inline] ip_output+0xe5/0x1b0 net/ipv4/ip_output.c:430 dst_output include/net/dst.h:444 [inline] ip_local_out+0x64/0x80 net/ipv4/ip_output.c:126 iptunnel_xmit+0x34a/0x4b0 net/ipv4/ip_tunnel_core.c:82 ip_tunnel_xmit+0x1451/0x1730 net/ipv4/ip_tunnel.c:813 __gre_xmit net/ipv4/ip_gre.c:469 [inline] ipgre_xmit+0x516/0x570 net/ipv4/ip_gre.c:661 __netdev_start_xmit include/linux/netdevice.h:4881 [inline] netdev_start_xmit include/linux/netdevice.h:4895 [inline] xmit_one net/core/dev.c:3580 [inline] dev_hard_start_xmit+0x127/0x400 net/core/dev.c:3596 __dev_queue_xmit+0x1007/0x1eb0 net/core/dev.c:4246 dev_queue_xmit include/linux/netdevice.h:3051 [inline] neigh_direct_output+0x17/0x20 net/core/neighbour.c:1623 neigh_output include/net/neighbour.h:546 [inline] ip_finish_output2+0x740/0x840 net/ipv4/ip_output.c:228 ip_finish_output+0xf4/0x240 net/ipv4/ip_output.c:316 NF_HOOK_COND include/linux/netfilter.h:291 [inline] ip_output+0xe5/0x1b0 net/i ---truncated---
CVSS Details
- CVSS 3.1 Base Score: 5.5
- CVSS 3.1 Vector: (CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H)
Covered by Rapid7
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Amazon Linux Ami 2 | — | Upgrade kernel-livepatch-5.15.104-63.140Upgrade kernel-debuginfo-common-x86_64Upgrade kernel-livepatch-4.14.311-233.529Upgrade kernel-livepatch-5.10.176-157.645Upgrade python-perfUpgrade perf-debuginfoUpgrade bpftoolUpgrade bpftool-debuginfoUpgrade kernel-toolsUpgrade python-perf-debuginfoUpgrade kernel-tools-develUpgrade kernel-headersUpgrade perfUpgrade kernel-develUpgrade kernel-tools-debuginfoUpgrade kernelUpgrade kernel-debuginfo-common-aarch64Upgrade kernel-debuginfo | Jun 23, 2025 | May 2, 2025 |
| Amazon_linux_2023 | — | Upgrade kernel-tools-debuginfoUpgrade bpftool-debuginfoUpgrade kernel-libbpf-staticUpgrade kernel-livepatch-6.1.21-1.45Upgrade kernel-libbpfUpgrade python3-perf-debuginfoUpgrade kernel-toolsUpgrade bpftoolUpgrade kernel-headersUpgrade kernel-debuginfo-common-x86_64Upgrade kernel-tools-develUpgrade kernelUpgrade kernel-libbpf-develUpgrade kernel-debuginfoUpgrade perf-debuginfoUpgrade kernel-debuginfo-common-aarch64Upgrade perfUpgrade kernel-develUpgrade python3-perf | Jun 24, 2025 | May 2, 2025 |
| Debian | — | Upgrade linux | May 5, 2025 | May 2, 2025 |
| Huawei Euleros 2_0_sp10 | — | Upgrade kernel-abi-stablelistsUpgrade kernel-toolsUpgrade kernelUpgrade kernel-tools-libsUpgrade python3-perf | Nov 12, 2025 | Oct 23, 2025 |
| Huawei Euleros 2_0_sp13 | — | Upgrade python3-perfUpgrade kernelUpgrade kernel-tools-libsUpgrade kernel-toolsUpgrade bpftoolUpgrade kernel-abi-stablelists | Oct 24, 2025 | Oct 23, 2025 |
| Redhat_linux | — | No solution exists | Jul 9, 2025 | May 2, 2025 |
| Ubuntu | — | Upgrade linux-fipsUpgrade linux-azure-5.15Upgrade linux-intel-iotgUpgrade linux-ibm-5.15Upgrade linux-lowlatency-hwe-5.15Upgrade linux-gcp-5.15Upgrade linux-nvidiaUpgrade linux-gkeopUpgrade linux-gkeUpgrade linux-nvidia-tegraUpgrade linux-gcp-5.4Upgrade linux-oracleUpgrade linux-kvmUpgrade linux-bluefieldUpgrade linux-riscv-5.15Upgrade linux-xilinx-zynqmpUpgrade linux-aws-5.15Upgrade linux-nvidia-tegra-5.15Upgrade linux-oracle-5.15Upgrade linux-intel-iot-realtimeUpgrade linux-realtimeUpgrade linux-raspi-5.4Upgrade linux-nvidia-tegra-igxUpgrade linux-oracle-5.4Upgrade linux-ibmUpgrade linux-gcpUpgrade linux-awsUpgrade linux-intel-iotg-5.15Upgrade linux-azure-fipsUpgrade linux-lowlatencyUpgrade linux-aws-5.4Upgrade linux-raspiUpgrade linux-ibm-5.4Upgrade linux-hwe-5.4Upgrade linux-hwe-5.15Upgrade linux-iotUpgrade linuxUpgrade linux-azureUpgrade linux-aws-fipsUpgrade linux-gcp-fipsUpgrade linux-azure-5.4 | May 8, 2025 | May 2, 2025 |
| Vmware Photon_os | — | Use 'tdnf update' to upgrade all packages to the latest version. | May 27, 2026 | May 2, 2025 |
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