{"id":"CVE-2026-97957","summary":"net: hinic: fix mailbox segment buffer overflow","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nnet: hinic: fix mailbox segment buffer overflow\n\ncheck_mbox_seq_id_and_seg_len() validates that seq_id does not\nexceed SEQ_ID_MAX_VAL (42) and seg_len does not exceed\nMBOX_SEG_LEN (48).  However, this allows the last segment\n(seq_id=42) to carry a full 48-byte payload, writing to offset\n42*48=2016 for 48 bytes (ending at byte 2064).  The receive\nbuffer is only MBOX_MAX_BUF_SZ (2048) bytes, resulting in a\n16-byte heap buffer overflow.\n\nThe hinic3 driver already handles this correctly by defining\nMBOX_LAST_SEG_MAX_LEN and rejecting the last segment when it\nexceeds the remaining buffer space.  Apply the same fix to the\nhinic driver.","modified":"2026-09-26T03:48:27.927112011Z","published":"2026-09-25T10:23:03.153Z","database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/97xxx/CVE-2026-97957.json","cna_assigner":"Linux"},"references":[{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"},{"type":"WEB","url":"https://git.kernel.org/stable/c/513f7b16ed0cffae9348151c72bed17c7073096f"},{"type":"WEB","url":"https://git.kernel.org/stable/c/5d4d985957434867bbe85e4fa5e638f3e48ad522"},{"type":"WEB","url":"https://git.kernel.org/stable/c/9f6ad383901d0cb1c8ea5f7f3160fabfe1540eb5"},{"type":"WEB","url":"https://git.kernel.org/stable/c/eca54a092d5f7b497b458ff5a6f66d4f7bfb6674"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/97xxx/CVE-2026-97957.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-97957"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"a425b6e1c69ba907b72b737a4d44f8cfbc43ce3c"},{"fixed":"eca54a092d5f7b497b458ff5a6f66d4f7bfb6674"},{"fixed":"9f6ad383901d0cb1c8ea5f7f3160fabfe1540eb5"},{"fixed":"513f7b16ed0cffae9348151c72bed17c7073096f"},{"fixed":"5d4d985957434867bbe85e4fa5e638f3e48ad522"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-97957.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"5.8.0"},{"fixed":"6.12.111"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.13.0"},{"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-2026-97957.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H"}]}