CVE-2026-74255tipc: fix UAF in tipc_l2_send_msg()
- 9.8CriticalCVSS base score
- 0.50%Exploitation in 30 daysEPSS · top 57% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- NonePublic exploitsnone known yet
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
Timeline
ID reserved
By Linux
Published
- 2 months later
· 2 months later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| LinuxCNA (assigner) | 3.1 | Critical9.8 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
| NVDNVD · Received | 3.1 | Critical9.8 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
- EPSS (exploitation in 30 days)
- 0.50% · top 57% of all CVEs (14 Nov 2026)
- CISA SSVC
- Exploitation: none · Automatable: yes · Technical impact: total
The list uses the assigner's score when there is one, then CISA's, then NVD's: Critical 9.8.
Affected products
- affected 282b3a056225b35024246f63feb91d769d714dad – < 609ced2301be1df7e7ed2ef47d1d916674e6ba3b
- affected 282b3a056225b35024246f63feb91d769d714dad – < 71aafa16d79b107b33837f60b6cbc7d0cb8c5708
- affected 282b3a056225b35024246f63feb91d769d714dad – < f4002f1c669cc02e3763f479fc25ff1dfa9e2420
- affected 282b3a056225b35024246f63feb91d769d714dad – < 50ff092633b06382e5091dd5b093ce943d4ac2f9
- affected 282b3a056225b35024246f63feb91d769d714dad – < aef12b5ce793dea6b3a97a58fd0f946000ae8945
- affected 282b3a056225b35024246f63feb91d769d714dad – < 0d8a12d7143126afdf9fbe2e3d438650dd6603ed
- affected 282b3a056225b35024246f63feb91d769d714dad – < 35e0297a93c3c34a3924eeef816c03504e3ab5c5
- affected 282b3a056225b35024246f63feb91d769d714dad – < f4c3d89fc986b0da196ddfc6cfe0ea5d5d08bec6
- affected 4.4
- unaffected < 4.4
- unaffected 5.10.261 – ≤ 5.10.*
- unaffected 5.15.212 – ≤ 5.15.*
- unaffected 6.1.178 – ≤ 6.1.*
- unaffected 6.6.145 – ≤ 6.6.*
- unaffected 6.12.97 – ≤ 6.12.*
- unaffected 6.18.40 – ≤ 6.18.*
- unaffected 7.1.5 – ≤ 7.1.*
- unaffected 7.2 – ≤ *
References
References8
- https://git.kernel.org/stable/c/609ced2301be1df7e7ed2ef47d1d916674e6ba3b (opens in a new tab)
- https://git.kernel.org/stable/c/71aafa16d79b107b33837f60b6cbc7d0cb8c5708 (opens in a new tab)
- https://git.kernel.org/stable/c/f4002f1c669cc02e3763f479fc25ff1dfa9e2420 (opens in a new tab)
- https://git.kernel.org/stable/c/50ff092633b06382e5091dd5b093ce943d4ac2f9 (opens in a new tab)
- https://git.kernel.org/stable/c/aef12b5ce793dea6b3a97a58fd0f946000ae8945 (opens in a new tab)
- https://git.kernel.org/stable/c/0d8a12d7143126afdf9fbe2e3d438650dd6603ed (opens in a new tab)
- https://git.kernel.org/stable/c/35e0297a93c3c34a3924eeef816c03504e3ab5c5 (opens in a new tab)
- https://git.kernel.org/stable/c/f4c3d89fc986b0da196ddfc6cfe0ea5d5d08bec6 (opens in a new tab)
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- EUVD EUVD-2026-59402 (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://cveledger.app/cve/CVE-2026-74255)Record last updated .