{"id":"CVE-2026-97618","summary":"io_uring/net: don't overconsume buffers when using MSG_TRUNC","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nio_uring/net: don't overconsume buffers when using MSG_TRUNC\n\nWhen a recv/recvmsg is issued with MSG_TRUNC and the incoming packet is\nlarger than the provided buffer, the net layer returns the full length\nof the packet rather than the number of bytes actually copied into the\nbuffer.  As a result, io_uring advances more of the provided buffer ring\nthan was actually filled.  Use the actual filled region size to consume\nthe buffer, but still return the full size to preserve MSG_TRUNC\nsemantics.\n\nTake care with multishot, because that seems to already truncate the\nconsumption based on the available payload size.\n\nThis was reported in https://github.com/axboe/liburing/issues/1619.\n\n[axboe: fold in size_t unsigned fix]","modified":"2026-09-27T03:47:31.088127469Z","published":"2026-09-25T10:22:25.049Z","database_specific":{"cna_assigner":"Linux","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/97xxx/CVE-2026-97618.json"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/2e70ea75c7bb38a6dc212975f887310f14f7c043"},{"type":"WEB","url":"https://git.kernel.org/stable/c/6028b543884f8735e057ec9eea4908cd61cab230"},{"type":"WEB","url":"https://git.kernel.org/stable/c/927d96f91c582b319d104ecf50ec935a8dc29193"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/97xxx/CVE-2026-97618.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-97618"},{"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":"ae98dbf43d755b4e111fcd086e53939bef3e9a1a"},{"fixed":"927d96f91c582b319d104ecf50ec935a8dc29193"},{"fixed":"2e70ea75c7bb38a6dc212975f887310f14f7c043"},{"fixed":"6028b543884f8735e057ec9eea4908cd61cab230"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-97618.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"6.12.0"},{"fixed":"6.18.53"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.19.0"},{"fixed":"7.2.7"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-97618.json"}}],"schema_version":"1.9.0"}