CVE-2026-74255Critical· 9.8▾ MidnightIn 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_dis…
▾ Midnight zone — Critical, or high with PoC / in-the-wild
impact 53.9 · likelihood 0.1 · exploitation 0
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Stakeholder-Specific Vulnerability Categorization from CISA's ADP record at CVE.org: whether exploitation is observed, whether an attack can be automated, and how much of the system is at stake. The CVSS score shown above comes from the assigning CNA record, not NVD.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via CVEORG
Last analysed / modified upstream
0.7%
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.[email protected]/T/#u
Linux >= 282b3a056225b35024246f63feb91d769d714dad < 609ced2301be1df7e7ed2ef47d1d916674e6ba3bLinux >= 282b3a056225b35024246f63feb91d769d714dad < 71aafa16d79b107b33837f60b6cbc7d0cb8c5708Linux >= 282b3a056225b35024246f63feb91d769d714dad < f4002f1c669cc02e3763f479fc25ff1dfa9e2420Linux >= 282b3a056225b35024246f63feb91d769d714dad < 50ff092633b06382e5091dd5b093ce943d4ac2f9Linux >= 282b3a056225b35024246f63feb91d769d714dad < aef12b5ce793dea6b3a97a58fd0f946000ae8945Linux >= 282b3a056225b35024246f63feb91d769d714dad < 0d8a12d7143126afdf9fbe2e3d438650dd6603edLinux >= 282b3a056225b35024246f63feb91d769d714dad < 35e0297a93c3c34a3924eeef816c03504e3ab5c5Linux >= 282b3a056225b35024246f63feb91d769d714dad < f4c3d89fc986b0da196ddfc6cfe0ea5d5d08bec6Linux 4.4Refer to the linked advisories for vendor-supplied fixes and affected version ranges.
Connected by shared product, vendor, weakness, or advisory.
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