{"id":"CVE-2026-74582","summary":"packet: use consistent hard_header_len in non-ring send paths","details":"In the Linux kernel, the following vulnerability has been resolved:\n\npacket: use consistent hard_header_len in non-ring send paths\n\npacket_snd() reads dev-\u003ehard_header_len multiple times while allocating\nand constructing an skb. Device reconfiguration can change this value\nconcurrently, for example through bonding device type changes.\n\nFor SOCK_RAW, packet_snd() can save a larger value in reserve and later\nallocate headroom using a smaller value. Moving skb-\u003edata back by reserve\nthen places it before skb-\u003ehead, and the following copy from userspace can\nattempt an out-of-bounds write.\n\npacket_sendmsg_spkt() has the same issue because it calculates its\nreservation and header offset from separate reads before dropping the RCU\nread lock to allocate the skb.\n\nAdd LL_RESERVED_SPACE_EX() for callers that already saved a header length.\nRead hard_header_len once in packet_snd() and use it for allocation and\nconstruction. In packet_sendmsg_spkt(), preserve the allocation-time value\nthrough the device lookup retry.\n\nThe separate SOCK_DGRAM consistency problem between hard_header_len and\nheader_ops-\u003ecreate is not addressed here.","modified":"2026-08-23T03:53:40.254254427Z","published":"2026-08-21T16:31:55.283Z","database_specific":{"cna_assigner":"Linux","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/74xxx/CVE-2026-74582.json"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/03390aa32e669cc4ecd7d34108e2e1afc13d689d"},{"type":"WEB","url":"https://git.kernel.org/stable/c/5bb10753d428aadfc356a2bfe9acea09c82a62ec"},{"type":"WEB","url":"https://git.kernel.org/stable/c/9052756290962ffb9a661bcf319e92dedaaedfed"},{"type":"WEB","url":"https://git.kernel.org/stable/c/91f041451f967cd87ed722a8f43c0b767a64f1a0"},{"type":"WEB","url":"https://git.kernel.org/stable/c/b06b6fce6d7deaf7238e09b48ce3b1125ff41acd"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/74xxx/CVE-2026-74582.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-74582"},{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"b84bbaf7a6c8cca24f8acf25a2c8e46913a947ba"},{"fixed":"91f041451f967cd87ed722a8f43c0b767a64f1a0"},{"fixed":"9052756290962ffb9a661bcf319e92dedaaedfed"},{"fixed":"5bb10753d428aadfc356a2bfe9acea09c82a62ec"},{"fixed":"b06b6fce6d7deaf7238e09b48ce3b1125ff41acd"},{"fixed":"03390aa32e669cc4ecd7d34108e2e1afc13d689d"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"0"},{"last_affected":"d9fb8cc230b2a4757e9fe4f81468f81212d4deaa"},{"last_affected":"6190cce26e40bf71c4d375b21eea74bb07b6a0f3"},{"last_affected":"01a658c1b9d4b5393c38d5a92d9112ab1425382a"},{"last_affected":"8809ae6747e760e6f1d2453ceb08c9bcc4939766"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"4.4.133"},{"fixed":"4.5"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"4.9.103"},{"fixed":"4.10"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"4.14.44"},{"fixed":"4.15"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"4.16.12"},{"fixed":"4.17"}]}],"versions":["v4.16","v4.4.132","v4.16.11","v4.14.43","v4.9.102","v4.16.10","v4.14.42","v4.9.101","v4.9.100","v4.14.41","v4.16.9","v4.16.8","v4.14.40","v4.9.99","v4.4.131","v4.16.7","v4.14.39","v4.9.98","v4.4.130","v4.9.97","v4.14.38","v4.16.6","v4.16.5","v4.14.37","v4.9.96","v4.4.129","v4.14.36","v4.16.4","v4.16.3","v4.14.35","v4.9.95","v4.4.128","v4.9.94","v4.14.34","v4.16.2","v4.4.127","v4.9.93","v4.14.33","v4.16.1","v4.16-rc7","v4.16-rc4","v4.14.32","v4.9.92","v4.4.126","v4.16-rc1","v4.16-rc2","v4.16-rc5","v4.4.125","v4.9.91","v4.14.31","v4.4.124","v4.9.90","v4.14.30","v4.16-rc3","v4.16-rc6","v4.14.29","v4.9.89","v4.4.123","v4.4.122","v4.9.88","v4.14.28","v4.14.27","v4.9.87","v4.4.121","v4.14.26","v4.14.25","v4.9.86","v4.4.120","v4.14.24","v4.14","v4.14.23","v4.9.85","v4.4.119","v4.15","v4.14.22","v4.9.84","v4.4.118","v4.14.21","v4.9.83","v4.4.117","v4.4.116","v4.9.82","v4.14.20","v4.9.81","v4.14.19","v4.4.115","v4.9.80","v4.14.18","v4.14.17","v4.15-rc1","v4.14.16","v4.9.79","v4.4.114","v4.15-rc4","v4.14.15","v4.9.78","v4.4.113","v4.15-rc9","v4.14.14","v4.9.77","v4.4.112","v4.15-rc8","v4.15-rc7","v4.14.13","v4.9.76","v4.4.111","v4.15-rc3","v4.15-rc2","v4.15-rc5","v4.15-rc6","v4.14.12","v4.9.75","v4.4.110","v4.14.11","v4.9.74","v4.4.109","v4.9.73","v4.4.108","v4.14.10","v4.14.9","v4.9.72","v4.14.8","v4.9.71","v4.4.107","v4.14.7","v4.9.70","v4.4.106","v4.14.6","v4.9.69","v4.4.105","v4.14.5","v4.9.68","v4.14.4","v4.9.67","v4.4.104","v4.14.3","v4.9.66","v4.4.103","v4.14.2","v4.9.65","v4.4.102","v4.14-rc1","v4.4.101","v4.14.1","v4.9.64","v4.4.100","v4.14-rc7","v4.9.63","v4.4.99","v4.9.62","v4.4.98","v4.4.97","v4.9.61","v4.14-rc3","v4.13","v4.14-rc8","v4.9.60","v4.4.96","v4.14-rc4","v4.14-rc6","v4.9.59","v4.4.95","v4.14-rc2","v4.14-rc5","v4.9.58","v4.4.94","v4.9.57","v4.4.93","v4.9.56","v4.4.92","v4.9.55","v4.9.54","v4.4.91","v4.9.53","v4.4.90","v4.9.52","v4.4.89","v4.9.51","v4.4.88","v4.13-rc2","v4.9.50","v4.9.49","v4.4.87","v4.9.48","v4.13-rc1","v4.13-rc3","v4.9.47","v4.4.86","v4.13-rc7","v4.9.46","v4.4.85","v4.13-rc4","v4.13-rc5","v4.13-rc6","v4.9.45","v4.4.84","v4.9.44","v4.4.83","v4.9.43","v4.4.82","v4.9.42","v4.4.81","v4.4.80","v4.9.41","v4.4.79","v4.9.40","v4.12-rc1","v4.9.39","v4.4.78","v4.12","v4.4.77","v4.9.38","v4.9.37","v4.4.76","v4.12-rc5","v4.9.36","v4.12-rc7","v4.9.35","v4.4.75","v4.12-rc6","v4.12-rc4","v4.9.34","v4.4.74","v4.12-rc2","v4.4.73","v4.9.33","v4.12-rc3","v4.9.32","v4.4.72","v4.11","v4.9.31","v4.4.71","v4.9.30","v4.4.70","v4.9.29","v4.4.69","v4.9.28","v4.4.68","v4.9.27","v4.4.67","v4.11-rc1","v4.9.26","v4.4.66","v4.11-rc6","v4.9.25",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