{"id":"CVE-2026-97957","title":"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\nM…","summary":"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\nM…","severity":"high","cvss":8.8,"cvssVector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H","cwe":["CWE-787"],"vendor":"Linux","product":"Linux","affected":["Linux >= a425b6e1c69ba907b72b737a4d44f8cfbc43ce3c < 7cc974799fde846eda2d8f00ad4f8e1810eb0499","Linux >= a425b6e1c69ba907b72b737a4d44f8cfbc43ce3c < 8de1e23bd91fe3a6683e4bc574e2d6bcb0eef920","Linux >= a425b6e1c69ba907b72b737a4d44f8cfbc43ce3c < 72be1fd5d256dde748c0905c5e1749a119cad5bd","Linux >= a425b6e1c69ba907b72b737a4d44f8cfbc43ce3c < c622bbc212207d7c6bbd69dd88f0c3a3f5853d16","Linux >= a425b6e1c69ba907b72b737a4d44f8cfbc43ce3c < eca54a092d5f7b497b458ff5a6f66d4f7bfb6674","Linux >= a425b6e1c69ba907b72b737a4d44f8cfbc43ce3c < 9f6ad383901d0cb1c8ea5f7f3160fabfe1540eb5","Linux >= a425b6e1c69ba907b72b737a4d44f8cfbc43ce3c < 513f7b16ed0cffae9348151c72bed17c7073096f","Linux >= a425b6e1c69ba907b72b737a4d44f8cfbc43ce3c < 5d4d985957434867bbe85e4fa5e638f3e48ad522","Linux 5.8"],"published":"2026-09-25","updated":"2026-10-03","sourceUpdated":"2026-10-03T11:18:20.720","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-97957","references":[{"url":"https://git.kernel.org/stable/c/513f7b16ed0cffae9348151c72bed17c7073096f","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/5d4d985957434867bbe85e4fa5e638f3e48ad522","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/72be1fd5d256dde748c0905c5e1749a119cad5bd","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/7cc974799fde846eda2d8f00ad4f8e1810eb0499","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/8de1e23bd91fe3a6683e4bc574e2d6bcb0eef920","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/9f6ad383901d0cb1c8ea5f7f3160fabfe1540eb5","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/c622bbc212207d7c6bbd69dd88f0c3a3f5853d16","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/eca54a092d5f7b497b458ff5a6f66d4f7bfb6674","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-97957.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-97957"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2541091"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-97957"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-97957"},{"url":"https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-97957.mbox"},{"url":"https://kernelcve.org/list/?q=CVE-2026-97957"}],"tags":["nvd","cve.org","csaf","vex","red-hat","score-dispute"],"epss":0.00143,"epssPercentile":0.03549,"scores":{"nvd":8.8,"vendor":5.5,"cna":8.8},"ingestedAt":"2026-09-25T11:06:38.876Z","slug":"CVE-2026-97957","body":"## Overview\n\nIn 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.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.\n\n## Vendor advisories\n\n- **Red Hat VEX** · Moderate · affected: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 9, Red Hat OpenShift Container Platform 4 · no fix planned: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 9, Red Hat OpenShift Container Platform 4 · updated 2026-10-21 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-97957.json)","depth":"twilight","depthScore":48,"depthScoreParts":{"impact":48.4,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[{"seq":210940,"id":"CVE-2026-97957","ts":1790349117459,"field":"cvss","old":null,"new":"8.8"},{"seq":210939,"id":"CVE-2026-97957","ts":1790349117459,"field":"severity","old":"none","new":"high"}]}