In the Linux kernel, the following vulnerability has been resolved:
tipc: move bc link creation back to tipc_node_create
Shuang Li reported a NULL pointer dereference crash:
[] BUG: kernel NULL pointer dereference, address: 0000000000000068 [] RIP: 0010:tipc_link_is_up+0x5/0x10 [tipc] [] Call Trace: [] <IRQ> [] tipc_bcast_rcv+0xa2/0x190 [tipc] [] tipc_node_bc_rcv+0x8b/0x200 [tipc] [] tipc_rcv+0x3af/0x5b0 [tipc] [] tipc_udp_recv+0xc7/0x1e0 [tipc]
It was caused by the 'l' passed into tipc_bcast_rcv() is NULL. When it creates a node in tipc_node_check_dest(), after inserting the new node into hashtable in tipc_node_create(), it creates the bc link. However, there is a gap between this insert and bc link creation, a bc packet may come in and get the node from the hashtable then try to dereference its bc link, which is NULL.
This patch is to fix it by moving the bc link creation before inserting into the hashtable.
Note that for a preliminary node becoming "real", the bc link creation should also be called before it's rehashed, as we don't create it for preliminary nodes.
CVSS Details
- CVSS 3.1 Base Score: 7.5
- CVSS 3.1 Vector: (CVSS:3.1/AV:N/AC:L/PR:N/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 perf-debuginfoUpgrade kernel-debuginfo-common-aarch64Upgrade perfUpgrade kernel-develUpgrade kernel-livepatch-5.10.130-118.517Upgrade kernel-headersUpgrade kernel-tools-develUpgrade kernel-debuginfoUpgrade kernel-toolsUpgrade kernel-livepatch-5.15.54-25.126Upgrade bpftoolUpgrade kernel-tools-debuginfoUpgrade kernelUpgrade bpftool-debuginfoUpgrade python-perf-debuginfoUpgrade kernel-debuginfo-common-x86_64Upgrade python-perf | May 22, 2025 | Feb 26, 2025 |
| Debian | — | Upgrade linux | Feb 27, 2025 | Feb 27, 2025 |
| Huawei Euleros 2_0_sp12 | — | Upgrade kernel-abi-stablelistsUpgrade kernelUpgrade kernel-tools-libsUpgrade bpftoolUpgrade python3-perfUpgrade kernel-tools | Jun 11, 2025 | Feb 26, 2025 |
| Huawei Euleros 2_0_sp13 | — | Upgrade bpftoolUpgrade kernel-tools-libsUpgrade python3-perfUpgrade kernel-abi-stablelistsUpgrade kernelUpgrade kernel-tools | Jun 11, 2025 | Feb 26, 2025 |
| Redhat_linux | — | No solution exists | Jul 9, 2025 | Feb 26, 2025 |
| Ubuntu | — | Upgrade linux-hwe-5.15Upgrade linux-awsUpgrade linux-nvidiaUpgrade linux-intel-iotg-5.15Upgrade linux-gkeopUpgrade linux-azureUpgrade linux-gcp-5.15Upgrade linux-azure-5.15Upgrade linux-kvmUpgrade linux-gcpUpgrade linux-oracleUpgrade linux-ibmUpgrade linux-riscv-5.15Upgrade linux-aws-5.15Upgrade linux-lowlatency-hwe-5.15Upgrade linux-oracle-5.15Upgrade linux-gkeUpgrade linux-raspiUpgrade linuxUpgrade linux-realtimeUpgrade linux-intel-iotgUpgrade linux-lowlatency | Mar 19, 2025 | Feb 26, 2025 |
| Vmware Photon_os | — | Use 'tdnf update' to upgrade all packages to the latest version. | May 27, 2026 | Feb 26, 2025 |
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