# CVE-2023-54039: linux: In the Linux kernel, the following vulnerability has been resolved:  can: j1939: j1939_tp_tx_dat_new(): fix out-of-bo...

CVE-2023-54039 is fixed in linux on 1 platform, first by DEBIAN-CVE-2023-54039, released December 24, 2025. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2023-54039
- Priority: Routine
- CVSS: n/a
- EPSS: 0.0019
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Dec 24, 2025

## Description

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]

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | linux Debian 12.15 (bookworm) | 6.1.25-1 | [DEBIAN-CVE-2023-54039](https://patchblox.com/security/data/fix/linux/debian-cve-2023-54039.md) | Dec 24, 2025 |
| Linux | linux Debian 13.5 (trixie) | 6.1.25-1 | [DEBIAN-CVE-2023-54039](https://patchblox.com/security/data/fix/linux/debian-cve-2023-54039.md) | Dec 24, 2025 |
| Linux | linux Debian 14 | 6.1.25-1 | [DEBIAN-CVE-2023-54039](https://patchblox.com/security/data/fix/linux/debian-cve-2023-54039.md) | Dec 24, 2025 |

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