In the Linux kernel, the following vulnerability has been resolved:
tipc: fix UAF in tipc_l2_send_msg()
Syzbot reported a slab-use-after-free in ipvlan_hard_header() when called from tipc_l2_send_msg().
The root cause is that tipc_disable_l2_media() calls synchronize_net() while b->media_ptr is still valid. This allows concurrent RCU readers to obtain the device pointer after synchronize_net() has finished. The pointer is cleared later in bearer_disable(), but without any subsequent synchronization, allowing the device to be freed while still in use by readers.
Fix this by clearing b->media_ptr in tipc_disable_l2_media() before calling synchronize_net().
This is safe to do now because the call order in bearer_disable() was reversed in 0d051bf93c06 ("tipc: make bearer packet filtering generic") to call tipc_node_delete_links() (which needs the pointer) before disable_media().
https: //lore.kernel.org/netdev/[email protected]/T/#u
CVSS Details
- CVSS 3.1 Base Score: 9.8
- CVSS 3.1 Vector: (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H)
Covered by Rapid7
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Amazon_linux_2023 | — | Upgrade kernel-debuginfo-common-aarch64Upgrade bpftool-debuginfoUpgrade kernel-debuginfoUpgrade perfUpgrade kernel-tools-develUpgrade kernel-modules-extraUpgrade kernel-tools-debuginfoUpgrade perf-debuginfoUpgrade kernel-headersUpgrade python3-perf-debuginfoUpgrade kernelUpgrade kernel-modules-extra-commonUpgrade bpftoolUpgrade kernel-livepatch-6.1.180-225.360Upgrade python3-perfUpgrade kernel-toolsUpgrade kernel-develUpgrade kernel-debuginfo-common-x86_64 | Sep 1, 2026 | Aug 15, 2026 |
| Debian | — | Upgrade linux | Aug 16, 2026 | Aug 16, 2026 |
| Redhat_linux | — | No solution exists | Aug 21, 2026 | Aug 15, 2026 |
| Vmware Photon_os | — | Use 'tdnf update' to upgrade all packages to the latest version. | Aug 21, 2026 | Aug 15, 2026 |
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