GHSA-3Q37-WMQ7-MF4X
Vulnerability from github – Published: 2025-12-24 12:30 – Updated: 2025-12-24 12:30In 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": [],
"aliases": [
"CVE-2023-54039"
],
"database_specific": {
"cwe_ids": [],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2025-12-24T11:15:56Z",
"severity": null
},
"details": "In the Linux kernel, the following vulnerability has been resolved:\n\ncan: j1939: j1939_tp_tx_dat_new(): fix out-of-bounds memory access\n\nIn the j1939_tp_tx_dat_new() function, an out-of-bounds memory access\ncould occur during the memcpy() operation if the size of skb-\u003ecb is\nlarger than the size of struct j1939_sk_buff_cb. This is because the\nmemcpy() operation uses the size of skb-\u003ecb, leading to a read beyond\nthe struct j1939_sk_buff_cb.\n\nUpdated the memcpy() operation to use the size of struct\nj1939_sk_buff_cb instead of the size of skb-\u003ecb. This ensures that the\nmemcpy() operation only reads the memory within the bounds of struct\nj1939_sk_buff_cb, preventing out-of-bounds memory access.\n\nAdditionally, add a BUILD_BUG_ON() to check that the size of skb-\u003ecb\nis greater than or equal to the size of struct j1939_sk_buff_cb. This\nensures that the skb-\u003ecb buffer is large enough to hold the\nj1939_sk_buff_cb structure.\n\n[mkl: rephrase commit message]",
"id": "GHSA-3q37-wmq7-mf4x",
"modified": "2025-12-24T12:30:29Z",
"published": "2025-12-24T12:30:28Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2023-54039"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/36befc9aed6202b4a9b906529aea13eacd7e34ff"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/4c3fb22a6ec68258ee129a2e6b720f43dffc562f"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/4fe1d9b6231a68ffc91318f57fd8e4982f028cf7"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/70caa596d158a5d84b117f722d58f3ea503a5ba9"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/b45193cb4df556fe6251b285a5ce44046dd36b4a"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/d2136f05690c272dfc9f9d6efcc51d5f53494b33"
}
],
"schema_version": "1.4.0",
"severity": []
}
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