CVE-2026-74255

CVE CVE-2026-74255EUVD EUVD-2026-59402Published 2026-08-15T05:57:34.000ZLast changed 2026-08-17T05:45:03.000ZCVSS 9.8

What the advisory describes

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/6a2c1007.428ffe26.258b27.015d.GAE@google.com/T/#u

Source: EUVD (ENISA), in the words of the advisory.

Products the advisory names

These come from the advisory itself, not from any check we performed.

Linux — Linux 4.4; patch: 7.2; 282b3a056225b35024246f63feb91d769d714dad <f4c3d89fc986b0da196ddfc6cfe0ea5d5d08bec6; patch: 6.12.97; 282b3a056225b35024246f63feb91d769d714dad <aef12b5ce793dea6b3a97a58fd0f946000ae8945; patch: 7.1.5; patch: 6.1.178; 282b3a056225b35024246f63feb91d769d714dad <609ced2301be1df7e7ed2ef47d1d916674e6ba3b; 282b3a056225b35024246f63feb91d769d714dad <0d8a12d7143126afdf9fbe2e3d438650dd6603ed; patch: 0; 282b3a056225b35024246f63feb91d769d714dad <71aafa16d79b107b33837f60b6cbc7d0cb8c5708; patch: 6.18.40; 282b3a056225b35024246f63feb91d769d714dad <f4002f1c669cc02e3763f479fc25ff1dfa9e2420; patch: 5.10.261; 282b3a056225b35024246f63feb91d769d714dad <35e0297a93c3c34a3924eeef816c03504e3ab5c5; 282b3a056225b35024246f63feb91d769d714dad <50ff092633b06382e5091dd5b093ce943d4ac2f9; patch: 5.15.212; patch: 6.6.145

The versions shown are the advisory's own. Patchlage compares no version numbers and derives no judgement from them — which version is installed is something a person has to look up.

Carried in the product catalogue

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Linux — Linux

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