tipc: fix UAF in tipc_l2_send_msg()
Summary
| CVE | CVE-2026-74255 |
|---|---|
| State | PUBLISHED |
| Assigner | Linux |
| Source Priority | CVE Program / NVD first with legacy fallback |
| Published | 2026-08-15 06:22:24 UTC |
| Updated | 2026-08-15 06:22:24 UTC |
| 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/[email protected]/T/#u |
Risk And Classification
EPSS: 0.001760000 probability, percentile 0.074230000 (date 2026-08-15)
Vendor Declared Affected Products
| Source | Vendor | Product | Version | Platforms |
|---|---|---|---|---|
| CNA | Linux | Linux | affected 282b3a056225b35024246f63feb91d769d714dad 609ced2301be1df7e7ed2ef47d1d916674e6ba3b git | Not specified |
| CNA | Linux | Linux | affected 282b3a056225b35024246f63feb91d769d714dad 71aafa16d79b107b33837f60b6cbc7d0cb8c5708 git | Not specified |
| CNA | Linux | Linux | affected 282b3a056225b35024246f63feb91d769d714dad f4002f1c669cc02e3763f479fc25ff1dfa9e2420 git | Not specified |
| CNA | Linux | Linux | affected 282b3a056225b35024246f63feb91d769d714dad 50ff092633b06382e5091dd5b093ce943d4ac2f9 git | Not specified |
| CNA | Linux | Linux | affected 282b3a056225b35024246f63feb91d769d714dad aef12b5ce793dea6b3a97a58fd0f946000ae8945 git | Not specified |
| CNA | Linux | Linux | affected 282b3a056225b35024246f63feb91d769d714dad 0d8a12d7143126afdf9fbe2e3d438650dd6603ed git | Not specified |
| CNA | Linux | Linux | affected 282b3a056225b35024246f63feb91d769d714dad 35e0297a93c3c34a3924eeef816c03504e3ab5c5 git | Not specified |
| CNA | Linux | Linux | affected 282b3a056225b35024246f63feb91d769d714dad f4c3d89fc986b0da196ddfc6cfe0ea5d5d08bec6 git | Not specified |
| CNA | Linux | Linux | affected 4.4 | Not specified |
| CNA | Linux | Linux | unaffected 4.4 semver | Not specified |
| CNA | Linux | Linux | unaffected 5.10.261 5.10.* semver | Not specified |
| CNA | Linux | Linux | unaffected 5.15.212 5.15.* semver | Not specified |
| CNA | Linux | Linux | unaffected 6.1.178 6.1.* semver | Not specified |
| CNA | Linux | Linux | unaffected 6.6.145 6.6.* semver | Not specified |
| CNA | Linux | Linux | unaffected 6.12.97 6.12.* semver | Not specified |
| CNA | Linux | Linux | unaffected 6.18.40 6.18.* semver | Not specified |
| CNA | Linux | Linux | unaffected 7.1.5 7.1.* semver | Not specified |
| CNA | Linux | Linux | unaffected 7.2-rc1 * original_commit_for_fix | Not specified |
References
| Reference | Source | Link | Tags |
|---|---|---|---|
| git.kernel.org/stable/c/50ff092633b06382e5091dd5b093ce943d4ac2f9 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/609ced2301be1df7e7ed2ef47d1d916674e6ba3b | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/71aafa16d79b107b33837f60b6cbc7d0cb8c5708 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/aef12b5ce793dea6b3a97a58fd0f946000ae8945 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/f4c3d89fc986b0da196ddfc6cfe0ea5d5d08bec6 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/35e0297a93c3c34a3924eeef816c03504e3ab5c5 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/0d8a12d7143126afdf9fbe2e3d438650dd6603ed | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/f4002f1c669cc02e3763f479fc25ff1dfa9e2420 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| CVE Program record | CVE.ORG | www.cve.org | canonical |
| NVD vulnerability detail | NVD | nvd.nist.gov | canonical, analysis |
No vendor comments have been submitted for this CVE.
There are currently no legacy QID mappings associated with this CVE.