{"id":"CVE-2026-74256","revision":"1dded3a24b0242558603f3a397d0a489","records":[{"revision":"1dded3a24b0242558603f3a397d0a489","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-74256","aliases":[],"title":"bpf, sockmap: fix integer overflow in bpf_msg_pop_data() bounds check","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nbpf, sockmap: fix integer overflow in bpf_msg_pop_data() bounds check\n\nstart and len are u32, so\n\n\tu64 last = start + len;\n\nevaluates start + len in 32-bit and wraps before storing it in last.\nThe bounds check\n\n\tif (start >= offset + l || last > msg->sg.size)\n\t\treturn -EINVAL;\n\ncan then be passed with an out-of-range start/len, after which the pop\nloop runs off the end of the scatterlist and sk_msg_shift_left() calls\nput_page() on the empty msg->sg.end slot:\n\n Oops: general protection fault, probably for non-canonical address\n 0xdffffc0000000001: 0000 [#1] SMP KASAN PTI\n KASAN: null-ptr-deref in range [0x0000000000000008-0x000000000000000f]\n RIP: 0010:sk_msg_shift_left net/core/filter.c:2957 [inline]\n RIP: 0010:____bpf_msg_pop_data net/core/filter.c:3103 [inline]\n RIP: 0010:bpf_msg_pop_data+0x753/0x1a10 net/core/filter.c:2984\n Call Trace:\n \n bpf_prog_4cc92c278f4d5d56+0x1b1/0x1e8\n bpf_prog_run_pin_on_cpu+0x107/0x320 include/linux/filter.h:746\n sk_psock_msg_verdict+0x357/0x7f0 net/core/skmsg.c:934\n tcp_bpf_send_verdict net/ipv4/tcp_bpf.c:420 [inline]\n tcp_bpf_sendmsg+0x766/0x1ae0 net/ipv4/tcp_bpf.c:583\n __sock_sendmsg+0x153/0x1c0 net/socket.c:802\n __sys_sendto+0x326/0x430 net/socket.c:2265\n __x64_sys_sendto+0xe3/0x100 net/socket.c:2268\n do_syscall_64+0x14c/0x480\n entry_SYSCALL_64_after_hwframe+0x77/0x7f\n \n\nWiden the addition with a (u64) cast so the bound is evaluated in\n64-bit and a len near U32_MAX no longer wraps below msg->sg.size.\n\nWhile here, change pop from int to u32. It counts bytes against the\nunsigned scatterlist lengths and can never be negative, so the signed\ntype only invites sign-confusion in the pop loop.","state":0,"publishedAt":"2026-08-15T05:57:34.956+00:00","modifiedAt":"2026-10-16T18:55:28.085+00:00","affected":[{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n \"product\": \"Linux\",\n \"vendor\": \"Linux\",\n \"defaultStatus\": \"unaffected\",\n \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n \"programFiles\": [\n \"net/core/filter.c\"\n ],\n \"versions\": [\n {\n \"version\": \"7246d8ed4dcce23f7509949a77be15fa9f0e3d28\",\n \"lessThan\": \"9ef44ed6fb0c1db01cfcc3de432a33e719713eb5\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"7246d8ed4dcce23f7509949a77be15fa9f0e3d28\",\n \"lessThan\": \"d693c5ed67dabe1ccbf8dcea93075bdc9ffd4ca0\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"7246d8ed4dcce23f7509949a77be15fa9f0e3d28\",\n \"lessThan\": \"ba5cc05dae8fce237d191c7ea96b1107a791e548\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"7246d8ed4dcce23f7509949a77be15fa9f0e3d28\",\n \"lessThan\": \"c05a0ec1cdced622a1a0c7d85679fe02f31033ec\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"7246d8ed4dcce23f7509949a77be15fa9f0e3d28\",\n \"lessThan\": \"17eb9832a10db2f7a80cb429ca2bc5038445a943\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"7246d8ed4dcce23f7509949a77be15fa9f0e3d28\",\n \"lessThan\": \"fe09dd288722f1c749b7506c0b3e7841a7d85027\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"7246d8ed4dcce23f7509949a77be15fa9f0e3d28\",\n \"lessThan\": \"e09f7bd7273928b4089e6b71f8e992f2b356ca1b\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"7246d8ed4dcce23f7509949a77be15fa9f0e3d28\",\n \"lessThan\": \"a48802fb2cd2d1e23651989f8ff4d15e9d5dad54\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n }\n ]\n }"},{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n \"product\": \"Linux\",\n \"vendor\": \"Linux\",\n \"defaultStatus\": \"affected\",\n \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n \"programFiles\": [\n \"net/core/filter.c\"\n ],\n \"versions\": [\n {\n \"version\": \"5.0\",\n \"status\": \"affected\"\n },\n {\n \"version\": \"0\",\n \"lessThan\": \"5.0\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"5.10.261\",\n \"lessThanOrEqual\": \"5.10.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"5.15.212\",\n \"lessThanOrEqual\": \"5.15.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.1.178\",\n \"lessThanOrEqual\": \"6.1.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.6.145\",\n \"lessThanOrEqual\": \"6.6.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.12.97\",\n \"lessThanOrEqual\": \"6.12.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.18.40\",\n \"lessThanOrEqual\": \"6.18.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"7.1.5\",\n \"lessThanOrEqual\": \"7.1.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"7.2\",\n \"lessThanOrEqual\": \"*\",\n \"status\": \"unaffected\",\n \"versionType\": \"original_commit_for_fix\"\n }\n ]\n }"}],"metrics":[{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","score":8.4,"severity":"HIGH"}],"references":["https://git.kernel.org/stable/c/9ef44ed6fb0c1db01cfcc3de432a33e719713eb5","https://git.kernel.org/stable/c/d693c5ed67dabe1ccbf8dcea93075bdc9ffd4ca0","https://git.kernel.org/stable/c/ba5cc05dae8fce237d191c7ea96b1107a791e548","https://git.kernel.org/stable/c/c05a0ec1cdced622a1a0c7d85679fe02f31033ec","https://git.kernel.org/stable/c/17eb9832a10db2f7a80cb429ca2bc5038445a943","https://git.kernel.org/stable/c/fe09dd288722f1c749b7506c0b3e7841a7d85027","https://git.kernel.org/stable/c/e09f7bd7273928b4089e6b71f8e992f2b356ca1b","https://git.kernel.org/stable/c/a48802fb2cd2d1e23651989f8ff4d15e9d5dad54"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-74256","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-74256","identifiers":["CVE-2026-74256"]},"retained":false,"historicalAffected":[]}],"coverage":[]}