Linux Kernel up to 6.2.10 j1939_tp_tx_dat_new out-of-bounds

Summaryinfo

A vulnerability classified as critical has been found in Linux Kernel up to 5.4.240/5.10.177/5.15.106/6.1.23/6.2.10. The impacted element is the function j1939_tp_tx_dat_new. Performing a manipulation results in out-of-bounds. This vulnerability is cataloged as CVE-2023-54039. There is no exploit available. It is recommended to upgrade the affected component.

Detailsinfo

A vulnerability, which was classified as problematic, was found in Linux Kernel up to 5.4.240/5.10.177/5.15.106/6.1.23/6.2.10. This affects the function j1939_tp_tx_dat_new. The manipulation with an unknown input leads to a out-of-bounds vulnerability. CWE is classifying the issue as CWE-125. The product reads data past the end, or before the beginning, of the intended buffer. This is going to have an impact on confidentiality. The summary by CVE is:

In the Linux kernel, the following vulnerability has been resolved: can: j1939: j1939_tp_tx_dat_new(): fix out-of-bounds memory access In the j1939_tp_tx_dat_new() function, an out-of-bounds memory access could occur during the memcpy() operation if the size of skb->cb is larger than the size of struct j1939_sk_buff_cb. This is because the memcpy() operation uses the size of skb->cb, leading to a read beyond the struct j1939_sk_buff_cb. Updated the memcpy() operation to use the size of struct j1939_sk_buff_cb instead of the size of skb->cb. This ensures that the memcpy() operation only reads the memory within the bounds of struct j1939_sk_buff_cb, preventing out-of-bounds memory access. Additionally, add a BUILD_BUG_ON() to check that the size of skb->cb is greater than or equal to the size of struct j1939_sk_buff_cb. This ensures that the skb->cb buffer is large enough to hold the j1939_sk_buff_cb structure. [mkl: rephrase commit message]

The advisory is shared at git.kernel.org. This vulnerability is uniquely identified as CVE-2023-54039 since 12/24/2025. Technical details are known, but no exploit is available.

The vulnerability scanner Nessus provides a plugin with the ID 279966 (Linux Distros Unpatched Vulnerability : CVE-2023-54039), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 5.4.241, 5.10.178, 5.15.107, 6.1.24 or 6.2.11 eliminates this vulnerability. Applying the patch d2136f05690c272dfc9f9d6efcc51d5f53494b33/70caa596d158a5d84b117f722d58f3ea503a5ba9/4fe1d9b6231a68ffc91318f57fd8e4982f028cf7/4c3fb22a6ec68258ee129a2e6b720f43dffc562f/36befc9aed6202b4a9b906529aea13eacd7e34ff/b45193cb4df556fe6251b285a5ce44046dd36b4a is able to eliminate this problem. The bugfix is ready for download at git.kernel.org. The best possible mitigation is suggested to be upgrading to the latest version.

The vulnerability is also documented in the databases at Tenable (279966) and CERT Bund (WID-SEC-2025-2920). Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Affected

• Open Source Linux Kernel

Productinfo

Type

• Operating System

Vendor

• Linux

Name

• Kernel

Version

• 5.4.240
• 5.10.177
• 5.15.106
• 6.1.0
• 6.1.1
• 6.1.2
• 6.1.3
• 6.1.4
• 6.1.5
• 6.1.6
• 6.1.7
• 6.1.8
• 6.1.9
• 6.1.10
• 6.1.11
• 6.1.12
• 6.1.13
• 6.1.14
• 6.1.15
• 6.1.16
• 6.1.17
• 6.1.18
• 6.1.19
• 6.1.20
• 6.1.21
• 6.1.22
• 6.1.23
• 6.2.0
• 6.2.1
• 6.2.2
• 6.2.3
• 6.2.4
• 6.2.5
• 6.2.6
• 6.2.7
• 6.2.8
• 6.2.9
• 6.2.10

License

• open-source

Website

• Vendor: https://www.kernel.org/

CPE 2.3info

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Entryinfo

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

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