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CVE-2026-74255— tipc: fix UAF in tipc_l2_send_msg()

Quick assessment

Affected
Linux Linux
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Linux kernel是美国Linux基金会开源的一个操作系统内核。 Linux kernel存在安全漏洞，该漏洞源于tipc_disable_l2_media()函数在b->media_ptr仍有效时调用synchronize_net()，导致并发RCU读者在设备指针被清除后仍能获得该指针，造成释放后重用。

CVSS 9.8 · Critical EPSS 0.51% · P41

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux 282b3a056225b35024246f63feb91d769d714dad< 609ced2301be1df7e7ed2ef47d1d916674e6ba3b affected
282b3a056225b35024246f63feb91d769d714dad< 71aafa16d79b107b33837f60b6cbc7d0cb8c5708 affected
282b3a056225b35024246f63feb91d769d714dad< f4002f1c669cc02e3763f479fc25ff1dfa9e2420 affected
282b3a056225b35024246f63feb91d769d714dad< 50ff092633b06382e5091dd5b093ce943d4ac2f9 affected
282b3a056225b35024246f63feb91d769d714dad< aef12b5ce793dea6b3a97a58fd0f946000ae8945 affected
282b3a056225b35024246f63feb91d769d714dad< 0d8a12d7143126afdf9fbe2e3d438650dd6603ed affected
282b3a056225b35024246f63feb91d769d714dad< 35e0297a93c3c34a3924eeef816c03504e3ab5c5 affected
282b3a056225b35024246f63feb91d769d714dad< f4c3d89fc986b0da196ddfc6cfe0ea5d5d08bec6 affected
… +10 more rows
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I. Basic Information for CVE-2026-74255

Vulnerability Information
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Vulnerability Title
tipc: fix UAF in tipc_l2_send_msg()
Source: CVE Program / CVE List V5
Vulnerability Description
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: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
Vulnerability Title
Linux kernel 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Linux kernel是美国Linux基金会开源的一个操作系统内核。 Linux kernel存在安全漏洞，该漏洞源于tipc_disable_l2_media()函数在b->media_ptr仍有效时调用synchronize_net()，导致并发RCU读者在设备指针被清除后仍能获得该指针，造成释放后重用。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Linux Linux 282b3a056225b35024246f63feb91d769d714dad ~ 609ced2301be1df7e7ed2ef47d1d916674e6ba3b -
Linux Linux 4.4 -

II. Public POCs for CVE-2026-74255

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III. Intelligence Information for CVE-2026-74255

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Patches & Fixes for CVE-2026-74255 (7)

Same Patch Batch · Linux · 2026-08-15 · 845 CVEs total

CVE-2026-74280 10.0 CRITICAL crypto: marvell/octeontx - fix DMA cleanup using wrong loop index
CVE-2026-74279 10.0 CRITICAL crypto: cavium/cpt - fix DMA cleanup using wrong loop index
CVE-2026-72421 10.0 CRITICAL ipv4: fib: Don't ignore error route in local/main tables.
CVE-2026-74475 10.0 CRITICAL vxlan: use neigh_ha_snapshot() in route_shortcircuit()
CVE-2026-72408 10.0 CRITICAL geneve: gate GRO hint in geneve_gro_complete() on gs->gro_hint
CVE-2026-72407 10.0 CRITICAL geneve: validate inner network offset in geneve_gro_complete()
CVE-2026-74309 10.0 CRITICAL vdpa/octeon_ep: fix IRQ-to-ring mapping in interrupt handler
CVE-2026-72493 9.9 CRITICAL net: serialize netif_running() check in enqueue_to_backlog()
CVE-2026-72206 9.8 CRITICAL ntfs: validate index block header more strictly
CVE-2026-72210 9.8 CRITICAL ntfs: fix off-by-one in mapping pairs decoding bounds checks
CVE-2026-72211 9.8 CRITICAL ntfs: grow index root value before reparent header update
CVE-2026-72209 9.8 CRITICAL ntfs: validate attribute values on lookup
CVE-2026-72299 9.8 CRITICAL tipc: restrict socket queue dumps in enqueue tracepoints
CVE-2026-74434 9.8 CRITICAL rxrpc: Don't move a peeked OOB message onto the pending queue
CVE-2026-74433 9.8 CRITICAL rxrpc: Fix UAF in rxgk_issue_challenge()
CVE-2026-72473 9.8 CRITICAL xprtrdma: Decouple req recycling from RPC completion
CVE-2026-72472 9.8 CRITICAL nfs: use nfsi->rwsem to protect traversal of the file lock list
CVE-2026-74545 9.8 CRITICAL rtase: fix double free of multi-frag skb on DMA map failure
CVE-2026-72046 9.8 CRITICAL gve: fix header buffer corruption with header-split and HW-GRO
CVE-2026-72466 9.8 CRITICAL xprtrdma: Fix bcall rep leak and unbounded peek

Showing top 20 of 845 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-74255

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