Linux Kernel up to 7.1.4 tipc tipc_l2_send_msg media_ptr use after free

CVSS Meta Temp Score
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Current Exploit Price (≈)
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CTI Interest Score
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9.5$5k-$25k0.00+

Summaryinfo

A vulnerability categorized as very critical has been discovered in Linux Kernel up to 7.1.4. Affected is the function tipc_l2_send_msg of the component tipc. Executing a manipulation of the argument media_ptr can lead to use after free. This vulnerability is tracked as CVE-2026-74255. The attack can be launched remotely. No exploit exists.

Detailsinfo

A vulnerability was found in Linux Kernel up to 7.1.4. It has been declared as very critical. This vulnerability affects the function tipc_l2_send_msg of the component tipc. The manipulation of the argument media_ptr with an unknown input leads to a use after free vulnerability. The CWE definition for the vulnerability is CWE-416. Referencing memory after it has been freed can cause a program to crash, use unexpected values, or execute code. As an impact it is known to affect confidentiality, integrity, and availability. CVE summarizes:

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

The advisory is available at git.kernel.org. This vulnerability was named CVE-2026-74255 since 08/15/2026. The exploitation appears to be easy. The attack can be initiated remotely. No form of authentication is required for a successful exploitation. Technical details are known, but there is no available exploit. The structure of the vulnerability defines a possible price range of USD $5k-$25k at the moment (estimation calculated on 08/15/2026).

Upgrading to version 5.10.261, 5.15.212, 6.1.178, 6.6.145, 6.12.97, 6.18.40, 7.1.5 or 7.2-rc1 eliminates this vulnerability. Applying the patch 609ced2301be1df7e7ed2ef47d1d916674e6ba3b/71aafa16d79b107b33837f60b6cbc7d0cb8c5708/f4002f1c669cc02e3763f479fc25ff1dfa9e2420/50ff092633b06382e5091dd5b093ce943d4ac2f9/aef12b5ce793dea6b3a97a58fd0f946000ae8945/0d8a12d7143126afdf9fbe2e3d438650dd6603ed/35e0297a93c3c34a3924eeef816c03504e3ab5c5/f4c3d89fc986b0da196ddfc6cfe0ea5d5d08bec6 is able to eliminate this problem.

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Productinfo

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Version

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CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 10.0
VulDB Meta Temp Score: 9.5

VulDB Base Score: 10.0
VulDB Temp Score: 9.5
VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv2info

AVACAuCIA
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💳💳💳💳💳💳
💳💳💳💳💳💳
VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Use after free
CWE: CWE-416 / CWE-119
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Status: Not defined
Price Prediction: 🔍
Current Price Estimation: 🔒

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Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: Kernel 5.10.261/5.15.212/6.1.178/6.6.145/6.12.97/6.18.40/7.1.5/7.2-rc1
Patch: 609ced2301be1df7e7ed2ef47d1d916674e6ba3b/71aafa16d79b107b33837f60b6cbc7d0cb8c5708/f4002f1c669cc02e3763f479fc25ff1dfa9e2420/50ff092633b06382e5091dd5b093ce943d4ac2f9/aef12b5ce793dea6b3a97a58fd0f946000ae8945/0d8a12d7143126afdf9fbe2e3d438650dd6603ed/35e0297a93c3c34a3924eeef816c03504e3ab5c5/f4c3d89fc986b0da196ddfc6cfe0ea5d5d08bec6

Timelineinfo

08/15/2026 Advisory disclosed
08/15/2026 +0 days CVE reserved
08/15/2026 +0 days VulDB entry created
08/15/2026 +0 days VulDB entry last update

Sourcesinfo

Vendor: kernel.org

Advisory: git.kernel.org
Status: Confirmed

CVE: CVE-2026-74255 (🔒)
GCVE (CVE): GCVE-0-2026-74255
GCVE (VulDB): GCVE-100-390202

Entryinfo

Created: 08/15/2026 08:23
Changes: 08/15/2026 08:23 (60)
Complete: 🔍
Cache ID: 216::103

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