Answer in brief
CVE-2026-74255 records a Critical severity (CVSS 9.8) vulnerability in tipc: fix UAF in tipc_l2_send_msg(). The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 9.8. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=282b3a056225b35024246f63feb91d769d714dad <609ced2301be1df7e7ed2ef47d1d916674e6ba3b || >=282b3a056225b35024246f63feb91d769d714dad <71aafa16d79b107b33837f60b6cbc7d0cb8c5708 || >=282b3a056225b35024246f63feb91d769d714dad <f4002f1c669cc02e3763f479fc25ff1dfa9e2420 || >=282b3a056225b35024246f63feb91d769d714dad <50ff092633b06382e5091dd5b093ce943d4ac2f9 || >=282b3a056225b35024246f63feb91d769d714dad <aef12b5ce793dea6b3a97a58fd0f946000ae8945 || >=282b3a056225b35024246f63feb91d769d714dad <0d8a12d7143126afdf9fbe2e3d438650dd6603ed || >=282b3a056225b35024246f63feb91d769d714dad <35e0297a93c3c34a3924eeef816c03504e3ab5c5 || >=282b3a056225b35024246f63feb91d769d714dad <f4c3d89fc986b0da196ddfc6cfe0ea5d5d08bec6 | 609ced2301be1df7e7ed2ef47d1d916674e6ba3b, 71aafa16d79b107b33837f60b6cbc7d0cb8c5708, f4002f1c669cc02e3763f479fc25ff1dfa9e2420, 50ff092633b06382e5091dd5b093ce943d4ac2f9, aef12b5ce793dea6b3a97a58fd0f946000ae8945, 0d8a12d7143126afdf9fbe2e3d438650dd6603ed, 35e0297a93c3c34a3924eeef816c03504e3ab5c5, f4c3d89fc986b0da196ddfc6cfe0ea5d5d08bec6 |
| Linux/Linuxgeneric | 4.4 | Not reported |
Published upstream
Aug 15, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Aug 17, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Aug 15, 2026
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
Quoted source text, attributed separately from HOL analysis.