{"id":"CVE-2026-98850","published":"2026-10-18T16:17:39.390","lastModified":"2026-10-19T10:19:49.103","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nnet/packet: prevent TX_RING byte count overflow\n\ntpacket_snd() drains every SEND_REQUEST frame in a TX ring and adds\neach valid packet length to the signed int len_sum. Userspace can\nrecycle completed frames concurrently, so a single blocking send call\nis not bounded by the ring size.\n\nAfter enough successful transmissions len_sum wraps into the negative\nrange. In particular, 65536 65535-byte frames followed by a 65007-byte\nframe produce 0xfffffdef, or -EIOCBQUEUED. sock_sendmsg_nosec() treats\nthat as an impossible return and triggers a BUG. On systems configured\nto panic on oops, a CAP_NET_RAW holder can panic the host kernel.\n\nStop before the next frame would make the byte count exceed INT_MAX.\nThe positive short count leaves that frame pending for a later send\ncall.\n\nA two-thread TPACKET_V2 reproducer triggered the BUG on an arm64 build\nof Linux 7.3-rc4. With this change, the same reproducer returned the\nexpected positive short count without an oops.","cvssScore":null,"cvssSeverity":null,"cvssVector":null,"cwes":[],"vendors":[],"products":[],"references":[{"url":"https://git.kernel.org/stable/c/2cf81fc9505b148b1b70068303ea6ea4b1212403","tags":[]},{"url":"https://git.kernel.org/stable/c/69ca64bbb528898916f309552053c32a04a36ebc","tags":[]},{"url":"https://git.kernel.org/stable/c/9fd63d284e251332f4874ef9023cde472f315f86","tags":[]},{"url":"https://git.kernel.org/stable/c/be12b221c0301111eeb023be04add3c6ad7c21fe","tags":[]}],"exploitRefs":[],"hasPoc":false,"ai":null}