{"id":"CVE-2026-93785","title":"In the Linux kernel, the following vulnerability has been resolved:\n\ncifs: validate idmap key payload length\n\nThe cifs.idmap key type stores its payload length in key->datalen, which\nis limited to U16_MAX","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\ncifs: validate idmap key payload length\n\nThe cifs.idmap key type stores its payload length in key->datalen, which\nis limited to U16_MAX.  Accepting a larger key payload…","severity":"none","vendor":"Linux","product":"Linux","affected":["Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 6cfeef221ac00d63c07f6122f58e6159bde69ca0","Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 8b12f65d7caf16d124098cb4895a203367d35b57","Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 455488cd5054bcc59db40fa1cc2c004031a5b2a5","Linux < 6.12.111","Linux < 6.18.53","Linux (all versions)"],"published":"2026-09-24","updated":"2026-09-24","sourceUpdated":"2026-09-24T17:17:11.130","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-93785","references":[{"url":"https://git.kernel.org/stable/c/455488cd5054bcc59db40fa1cc2c004031a5b2a5","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/6cfeef221ac00d63c07f6122f58e6159bde69ca0","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/8b12f65d7caf16d124098cb4895a203367d35b57","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"}],"tags":["nvd","cve.org"],"ingestedAt":"2026-09-24T16:47:15.903Z","slug":"CVE-2026-93785","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\ncifs: validate idmap key payload length\n\nThe cifs.idmap key type stores its payload length in key->datalen, which\nis limited to U16_MAX.  Accepting a larger key payload truncates the\nrecorded length and can make later users interpret the payload using\ninconsistent bounds.\n\nReject oversized preparsed payloads before allocating or copying them.\nThis keeps key->datalen consistent with the stored data for both inline\nand separately allocated idmap payloads.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"sunlit","depthScore":3,"depthScoreParts":{"impact":2.8,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}