CVE-2023-54039 (GCVE-0-2023-54039)

Vulnerability from cvelistv5 – Published: 2025-12-24 10:56 – Updated: 2025-12-24 10:56
VLAI?
Title
can: j1939: j1939_tp_tx_dat_new(): fix out-of-bounds memory access
Summary
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]
Severity ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 9d71dd0c70099914fcd063135da3c580865e924c , < d2136f05690c272dfc9f9d6efcc51d5f53494b33 (git)
Affected: 9d71dd0c70099914fcd063135da3c580865e924c , < 70caa596d158a5d84b117f722d58f3ea503a5ba9 (git)
Affected: 9d71dd0c70099914fcd063135da3c580865e924c , < 4fe1d9b6231a68ffc91318f57fd8e4982f028cf7 (git)
Affected: 9d71dd0c70099914fcd063135da3c580865e924c , < 4c3fb22a6ec68258ee129a2e6b720f43dffc562f (git)
Affected: 9d71dd0c70099914fcd063135da3c580865e924c , < 36befc9aed6202b4a9b906529aea13eacd7e34ff (git)
Affected: 9d71dd0c70099914fcd063135da3c580865e924c , < b45193cb4df556fe6251b285a5ce44046dd36b4a (git)
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    Linux Linux Affected: 5.4
Unaffected: 0 , < 5.4 (semver)
Unaffected: 5.4.241 , ≤ 5.4.* (semver)
Unaffected: 5.10.178 , ≤ 5.10.* (semver)
Unaffected: 5.15.107 , ≤ 5.15.* (semver)
Unaffected: 6.1.24 , ≤ 6.1.* (semver)
Unaffected: 6.2.11 , ≤ 6.2.* (semver)
Unaffected: 6.3 , ≤ * (original_commit_for_fix)
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          "lang": "en",
          "value": "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]"
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        "dateUpdated": "2025-12-24T10:56:05.365Z",
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}


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  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
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