CVE-2023-54039: Linux

EPSS: 0.2% chance of exploitation in the next 30 days.

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]

Affected products

• Linux Linux: from 5.4, before 5.4.241 (fixed in 5.4.241); from 5.5, before 5.10.178 (fixed in 5.10.178); from 5.11, before 5.15.107 (fixed in 5.15.107); from 5.16, before 6.1.24 (fixed in 6.1.24); from 6.2, before 6.2.11 (fixed in 6.2.11)

Published 2025-12-24. Last modified 2026-06-17.