{"id":"CVE-2023-54039","state":"PUBLISHED","title":"can: j1939: j1939_tp_tx_dat_new(): fix out-of-bounds memory access","description":"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->cb is\nlarger than the size of struct j1939_sk_buff_cb. This is because the\nmemcpy() operation uses the size of skb->cb, 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->cb. 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->cb\nis greater than or equal to the size of struct j1939_sk_buff_cb. This\nensures that the skb->cb buffer is large enough to hold the\nj1939_sk_buff_cb structure.\n\n[mkl: rephrase commit message]","publishedAt":"2025-12-24T10:56:05.365Z","updatedAt":"2026-05-11T19:54:14.838Z","severity":null,"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"9d71dd0c70099914fcd063135da3c580865e924c","status":"affected","lessThan":"d2136f05690c272dfc9f9d6efcc51d5f53494b33","versionType":"git"},{"version":"9d71dd0c70099914fcd063135da3c580865e924c","status":"affected","lessThan":"70caa596d158a5d84b117f722d58f3ea503a5ba9","versionType":"git"},{"version":"9d71dd0c70099914fcd063135da3c580865e924c","status":"affected","lessThan":"4fe1d9b6231a68ffc91318f57fd8e4982f028cf7","versionType":"git"},{"version":"9d71dd0c70099914fcd063135da3c580865e924c","status":"affected","lessThan":"4c3fb22a6ec68258ee129a2e6b720f43dffc562f","versionType":"git"},{"version":"9d71dd0c70099914fcd063135da3c580865e924c","status":"affected","lessThan":"36befc9aed6202b4a9b906529aea13eacd7e34ff","versionType":"git"},{"version":"9d71dd0c70099914fcd063135da3c580865e924c","status":"affected","lessThan":"b45193cb4df556fe6251b285a5ce44046dd36b4a","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/can/j1939/transport.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"5.4","status":"affected"},{"version":"0","status":"unaffected","lessThan":"5.4","versionType":"semver"},{"version":"5.4.241","status":"unaffected","lessThanOrEqual":"5.4.*","versionType":"semver"},{"version":"5.10.178","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.107","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.24","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.2.11","status":"unaffected","lessThanOrEqual":"6.2.*","versionType":"semver"},{"version":"6.3","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/can/j1939/transport.c"]}],"references":["https://git.kernel.org/stable/c/d2136f05690c272dfc9f9d6efcc51d5f53494b33","https://git.kernel.org/stable/c/70caa596d158a5d84b117f722d58f3ea503a5ba9","https://git.kernel.org/stable/c/4fe1d9b6231a68ffc91318f57fd8e4982f028cf7","https://git.kernel.org/stable/c/4c3fb22a6ec68258ee129a2e6b720f43dffc562f","https://git.kernel.org/stable/c/36befc9aed6202b4a9b906529aea13eacd7e34ff","https://git.kernel.org/stable/c/b45193cb4df556fe6251b285a5ce44046dd36b4a"],"weaknesses":[],"ingestedAt":"2026-10-29T20:06:42.242Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2023/54xxx/CVE-2023-54039.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2023-54039","state":"PUBLISHED","datePublished":"2025-12-24T10:56:05.365Z","dateUpdated":"2026-05-11T19:54:14.838Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2025-12-24T10:53:46.181Z"},"containers":{"cna":{"title":"can: j1939: j1939_tp_tx_dat_new(): fix out-of-bounds memory access","descriptions":[{"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->cb is\nlarger than the size of struct j1939_sk_buff_cb. This is because the\nmemcpy() operation uses the size of skb->cb, 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->cb. 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->cb\nis greater than or equal to the size of struct j1939_sk_buff_cb. This\nensures that the skb->cb buffer is large enough to hold the\nj1939_sk_buff_cb structure.\n\n[mkl: rephrase commit message]"}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"9d71dd0c70099914fcd063135da3c580865e924c","status":"affected","lessThan":"d2136f05690c272dfc9f9d6efcc51d5f53494b33","versionType":"git"},{"version":"9d71dd0c70099914fcd063135da3c580865e924c","status":"affected","lessThan":"70caa596d158a5d84b117f722d58f3ea503a5ba9","versionType":"git"},{"version":"9d71dd0c70099914fcd063135da3c580865e924c","status":"affected","lessThan":"4fe1d9b6231a68ffc91318f57fd8e4982f028cf7","versionType":"git"},{"version":"9d71dd0c70099914fcd063135da3c580865e924c","status":"affected","lessThan":"4c3fb22a6ec68258ee129a2e6b720f43dffc562f","versionType":"git"},{"version":"9d71dd0c70099914fcd063135da3c580865e924c","status":"affected","lessThan":"36befc9aed6202b4a9b906529aea13eacd7e34ff","versionType":"git"},{"version":"9d71dd0c70099914fcd063135da3c580865e924c","status":"affected","lessThan":"b45193cb4df556fe6251b285a5ce44046dd36b4a","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/can/j1939/transport.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"5.4","status":"affected"},{"version":"0","status":"unaffected","lessThan":"5.4","versionType":"semver"},{"version":"5.4.241","status":"unaffected","lessThanOrEqual":"5.4.*","versionType":"semver"},{"version":"5.10.178","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.107","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.24","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.2.11","status":"unaffected","lessThanOrEqual":"6.2.*","versionType":"semver"},{"version":"6.3","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/can/j1939/transport.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/d2136f05690c272dfc9f9d6efcc51d5f53494b33"},{"url":"https://git.kernel.org/stable/c/70caa596d158a5d84b117f722d58f3ea503a5ba9"},{"url":"https://git.kernel.org/stable/c/4fe1d9b6231a68ffc91318f57fd8e4982f028cf7"},{"url":"https://git.kernel.org/stable/c/4c3fb22a6ec68258ee129a2e6b720f43dffc562f"},{"url":"https://git.kernel.org/stable/c/36befc9aed6202b4a9b906529aea13eacd7e34ff"},{"url":"https://git.kernel.org/stable/c/b45193cb4df556fe6251b285a5ce44046dd36b4a"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-05-11T19:54:14.838Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.4","versionEndExcluding":"5.4.241"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.4","versionEndExcluding":"5.10.178"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.4","versionEndExcluding":"5.15.107"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.4","versionEndExcluding":"6.1.24"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.4","versionEndExcluding":"6.2.11"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.4","versionEndExcluding":"6.3"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}}}}}