In the Linux kernel, the following vulnerability has been resolved:
ipv6: addrlabel: fix infoleak when sending struct ifaddrlblmsg to network
When copying a `struct ifaddrlblmsg` to the network, __ifal_reserved remained uninitialized, resulting in a 1-byte infoleak:
BUG: KMSAN: kernel-network-infoleak in __netdev_start_xmit ./include/linux/netdevice.h:4841 __netdev_start_xmit ./include/linux/netdevice.h:4841 netdev_start_xmit ./include/linux/netdevice.h:4857 xmit_one net/core/dev.c:3590 dev_hard_start_xmit+0x1dc/0x800 net/core/dev.c:3606 __dev_queue_xmit+0x17e8/0x4350 net/core/dev.c:4256 dev_queue_xmit ./include/linux/netdevice.h:3009 __netlink_deliver_tap_skb net/netlink/af_netlink.c:307 __netlink_deliver_tap+0x728/0xad0 net/netlink/af_netlink.c:325 netlink_deliver_tap net/netlink/af_netlink.c:338 __netlink_sendskb net/netlink/af_netlink.c:1263 netlink_sendskb+0x1d9/0x200 net/netlink/af_netlink.c:1272 netlink_unicast+0x56d/0xf50 net/netlink/af_netlink.c:1360 nlmsg_unicast ./include/net/netlink.h:1061 rtnl_unicast+0x5a/0x80 net/core/rtnetlink.c:758 ip6addrlbl_get+0xfad/0x10f0 net/ipv6/addrlabel.c:628 rtnetlink_rcv_msg+0xb33/0x1570 net/core/rtnetlink.c:6082 ... Uninit was created at: slab_post_alloc_hook+0x118/0xb00 mm/slab.h:742 slab_alloc_node mm/slub.c:3398 __kmem_cache_alloc_node+0x4f2/0x930 mm/slub.c:3437 __do_kmalloc_node mm/slab_common.c:954 __kmalloc_node_track_caller+0x117/0x3d0 mm/slab_common.c:975 kmalloc_reserve net/core/skbuff.c:437 __alloc_skb+0x27a/0xab0 net/core/skbuff.c:509 alloc_skb ./include/linux/skbuff.h:1267 nlmsg_new ./include/net/netlink.h:964 ip6addrlbl_get+0x490/0x10f0 net/ipv6/addrlabel.c:608 rtnetlink_rcv_msg+0xb33/0x1570 net/core/rtnetlink.c:6082 netlink_rcv_skb+0x299/0x550 net/netlink/af_netlink.c:2540 rtnetlink_rcv+0x26/0x30 net/core/rtnetlink.c:6109 netlink_unicast_kernel net/netlink/af_netlink.c:1319 netlink_unicast+0x9ab/0xf50 net/netlink/af_netlink.c:1345 netlink_sendmsg+0xebc/0x10f0 net/netlink/af_netlink.c:1921 ...
This patch ensures that the reserved field is always initialized.
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Amazon Linux Ami 2 | — | Upgrade kernel-debuginfo-common-x86_64Upgrade kernelUpgrade bpftool-debuginfoUpgrade bpftoolUpgrade kernel-livepatch-4.14.301-224.520Upgrade perfUpgrade kernel-debuginfoUpgrade perf-debuginfoUpgrade kernel-headersUpgrade python-perf-debuginfoUpgrade kernel-tools-develUpgrade kernel-debuginfo-common-aarch64Upgrade kernel-livepatch-5.15.79-51.138Upgrade kernel-livepatch-5.10.155-138.670Upgrade kernel-develUpgrade kernel-tools-debuginfoUpgrade kernel-toolsUpgrade python-perf | Jun 23, 2025 | May 1, 2025 |
| Debian | — | Upgrade linux | May 5, 2025 | May 1, 2025 |
| Huawei Euleros 2_0_sp10 | — | Upgrade kernel-tools-libsUpgrade kernel-abi-stablelistsUpgrade kernelUpgrade python3-perfUpgrade kernel-tools | Sep 15, 2025 | Sep 9, 2025 |
| Huawei Euleros 2_0_sp13 | — | Upgrade python3-perfUpgrade kernel-tools-libsUpgrade bpftoolUpgrade kernel-abi-stablelistsUpgrade kernel-toolsUpgrade kernel | Oct 24, 2025 | Sep 9, 2025 |
| Redhat_linux | — | No solution exists | Jul 9, 2025 | May 1, 2025 |
| Ubuntu | — | Upgrade linux-azureUpgrade linux-intel-iot-realtimeUpgrade linux-realtimeUpgrade linux-lowlatency-hwe-5.15Upgrade linux-hweUpgrade linux-aws-5.15Upgrade linux-raspi-5.4Upgrade linux-gcp-4.15Upgrade linux-iotUpgrade linux-gcpUpgrade linux-nvidia-tegra-5.15Upgrade linux-gcp-fipsUpgrade linux-azure-fdeUpgrade linux-azure-5.4Upgrade linux-gcp-5.15Upgrade linux-bluefieldUpgrade linux-riscv-5.15Upgrade linux-azure-4.15Upgrade linux-awsUpgrade linux-intel-iotg-5.15Upgrade linux-hwe-5.4Upgrade linux-aws-5.4Upgrade linux-ibmUpgrade linux-kvmUpgrade linux-raspiUpgrade linux-lowlatencyUpgrade linux-fipsUpgrade linux-gcp-5.4Upgrade linux-oracle-5.15Upgrade linux-ibm-5.4Upgrade linux-gkeopUpgrade linux-nvidiaUpgrade linux-oracle-5.4Upgrade linux-hwe-5.15Upgrade linuxUpgrade linux-aws-hweUpgrade linux-gkeUpgrade linux-aws-fipsUpgrade linux-intel-iotgUpgrade linux-azure-fipsUpgrade linux-azure-5.15Upgrade linux-oracleUpgrade linux-xilinx-zynqmp | May 6, 2025 | May 1, 2025 |
| Vmware Photon_os | — | Use 'tdnf update' to upgrade all packages to the latest version. | May 27, 2026 | May 1, 2025 |
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