In the Linux kernel, the following vulnerability has been resolved:
hsr: Fix uninit-value access in fill_frame_info()
Syzbot reports the following uninit-value access problem.
===================================================== BUG: KMSAN: uninit-value in fill_frame_info net/hsr/hsr_forward.c:601 [inline] BUG: KMSAN: uninit-value in hsr_forward_skb+0x9bd/0x30f0 net/hsr/hsr_forward.c:616 fill_frame_info net/hsr/hsr_forward.c:601 [inline] hsr_forward_skb+0x9bd/0x30f0 net/hsr/hsr_forward.c:616 hsr_dev_xmit+0x192/0x330 net/hsr/hsr_device.c:223 __netdev_start_xmit include/linux/netdevice.h:4889 [inline] netdev_start_xmit include/linux/netdevice.h:4903 [inline] xmit_one net/core/dev.c:3544 [inline] dev_hard_start_xmit+0x247/0xa10 net/core/dev.c:3560 __dev_queue_xmit+0x34d0/0x52a0 net/core/dev.c:4340 dev_queue_xmit include/linux/netdevice.h:3082 [inline] packet_xmit+0x9c/0x6b0 net/packet/af_packet.c:276 packet_snd net/packet/af_packet.c:3087 [inline] packet_sendmsg+0x8b1d/0x9f30 net/packet/af_packet.c:3119 sock_sendmsg_nosec net/socket.c:730 [inline] sock_sendmsg net/socket.c:753 [inline] __sys_sendto+0x781/0xa30 net/socket.c:2176 __do_sys_sendto net/socket.c:2188 [inline] __se_sys_sendto net/socket.c:2184 [inline] __ia32_sys_sendto+0x11f/0x1c0 net/socket.c:2184 do_syscall_32_irqs_on arch/x86/entry/common.c:112 [inline] __do_fast_syscall_32+0xa2/0x100 arch/x86/entry/common.c:178 do_fast_syscall_32+0x37/0x80 arch/x86/entry/common.c:203 do_SYSENTER_32+0x1f/0x30 arch/x86/entry/common.c:246 entry_SYSENTER_compat_after_hwframe+0x70/0x82
Uninit was created at: slab_post_alloc_hook+0x12f/0xb70 mm/slab.h:767 slab_alloc_node mm/slub.c:3478 [inline] kmem_cache_alloc_node+0x577/0xa80 mm/slub.c:3523 kmalloc_reserve+0x148/0x470 net/core/skbuff.c:559 __alloc_skb+0x318/0x740 net/core/skbuff.c:644 alloc_skb include/linux/skbuff.h:1286 [inline] alloc_skb_with_frags+0xc8/0xbd0 net/core/skbuff.c:6299 sock_alloc_send_pskb+0xa80/0xbf0 net/core/sock.c:2794 packet_alloc_skb net/packet/af_packet.c:2936 [inline] packet_snd net/packet/af_packet.c:3030 [inline] packet_sendmsg+0x70e8/0x9f30 net/packet/af_packet.c:3119 sock_sendmsg_nosec net/socket.c:730 [inline] sock_sendmsg net/socket.c:753 [inline] __sys_sendto+0x781/0xa30 net/socket.c:2176 __do_sys_sendto net/socket.c:2188 [inline] __se_sys_sendto net/socket.c:2184 [inline] __ia32_sys_sendto+0x11f/0x1c0 net/socket.c:2184 do_syscall_32_irqs_on arch/x86/entry/common.c:112 [inline] __do_fast_syscall_32+0xa2/0x100 arch/x86/entry/common.c:178 do_fast_syscall_32+0x37/0x80 arch/x86/entry/common.c:203 do_SYSENTER_32+0x1f/0x30 arch/x86/entry/common.c:246 entry_SYSENTER_compat_after_hwframe+0x70/0x82
It is because VLAN not yet supported in hsr driver. Return error when protocol is ETH_P_8021Q in fill_frame_info() now to fix it.
CVSS Details
- CVSS 3.1 Base Score: 7.1
- CVSS 3.1 Vector: (CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H)
Covered by Rapid7
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Amazon Linux Ami 2 | — | Upgrade python-perf-debuginfoUpgrade kernel-livepatch-5.15.133-86.144Upgrade kernel-debuginfoUpgrade kernel-headersUpgrade kernel-tools-develUpgrade kernel-debuginfo-common-x86_64Upgrade bpftoolUpgrade kernelUpgrade perfUpgrade kernel-tools-debuginfoUpgrade kernel-debuginfo-common-aarch64Upgrade perf-debuginfoUpgrade bpftool-debuginfoUpgrade python-perfUpgrade kernel-develUpgrade kernel-toolsUpgrade kernel-livepatch-5.10.196-185.743 | May 20, 2026 | May 20, 2026 |
| Amazon_linux_2023 | — | Upgrade kernel-tools-debuginfoUpgrade kernel-livepatch-6.1.55-75.123Upgrade perf-debuginfoUpgrade kernel-tools-develUpgrade kernel-debuginfoUpgrade kernel-libbpfUpgrade kernel-toolsUpgrade kernel-debuginfo-common-aarch64Upgrade perfUpgrade python3-perfUpgrade kernel-develUpgrade kernel-headersUpgrade kernel-libbpf-staticUpgrade bpftoolUpgrade kernelUpgrade bpftool-debuginfoUpgrade kernel-libbpf-develUpgrade python3-perf-debuginfoUpgrade kernel-debuginfo-common-x86_64 | Oct 24, 2025 | Oct 1, 2025 |
| Debian | — | Upgrade linux | Oct 3, 2025 | Oct 3, 2025 |
| Redhat_linux | — | No solution exists | Jul 17, 2026 | Oct 1, 2025 |
| Ubuntu | — | Upgrade linux-intel-iotgUpgrade linux-bluefieldUpgrade linux-awsUpgrade linux-riscv-5.15Upgrade linux-gcp-5.15Upgrade linux-realtimeUpgrade linux-nvidia-tegra-igxUpgrade linux-intel-iot-realtimeUpgrade linux-lowlatency-hwe-5.15Upgrade linux-gcp-fipsUpgrade linux-gcpUpgrade linuxUpgrade linux-kvmUpgrade linux-raspiUpgrade linux-ibm-5.15Upgrade linux-gkeopUpgrade linux-oracleUpgrade linux-ibmUpgrade linux-fipsUpgrade linux-nvidia-tegra-5.15Upgrade linux-aws-5.15Upgrade linux-azureUpgrade linux-azure-5.15Upgrade linux-nvidia-tegraUpgrade linux-gkeUpgrade linux-oracle-5.15Upgrade linux-hwe-5.15Upgrade linux-aws-fipsUpgrade linux-lowlatencyUpgrade linux-intel-iotg-5.15Upgrade linux-xilinx-zynqmpUpgrade linux-nvidia | Oct 10, 2025 | Oct 1, 2025 |
| Vmware Photon_os | — | Use 'tdnf update' to upgrade all packages to the latest version. | Oct 15, 2025 | Oct 1, 2025 |
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