{"id":"CVE-2026-98405","title":"In the Linux kernel, the following vulnerability has been resolved:\n\nsmb: client: fix missing iov bounds check in parse_posix_sids()\n\nIn parse_posix_sids(), sidsbuf_end is calculated using the server-supplied\nout_len without being valida…","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\nsmb: client: fix missing iov bounds check in parse_posix_sids()\n\nIn parse_posix_sids(), sidsbuf_end is calculated using the server-supplied\nout_len without being valida…","severity":"high","published":"2026-10-14","updated":"2026-10-14","sourceUpdated":"2026-10-14T14:17:51.603","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-98405","references":[{"url":"https://git.kernel.org/stable/c/2f8ed71aaaba3bc8b19cd9930cc62e63e142b299","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/b09d092eb24ad0110f16a9b7c1ed5d2a0c1733dc","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/b862996e5105be1293da9cdc85da77b76021c3bd","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/d91b9a3b2b38e5ac1b51e9e5b23fe53ad7b49644","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/eac6917a42899aad0617bbf04798c5dd946a1fe5","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-98405.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-98405"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2552207"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-98405"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-98405"},{"url":"https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-98405.mbox"},{"url":"https://kernelcve.org/list/?q=CVE-2026-98405"}],"tags":["nvd","cve.org","csaf","vex","red-hat"],"ingestedAt":"2026-10-14T15:36:13.982Z","vendor":"Linux","product":"Linux","affected":["Linux >= a90f37e3d7acfd9824f162830583bbf7846fe252 < d91b9a3b2b38e5ac1b51e9e5b23fe53ad7b49644","Linux >= a90f37e3d7acfd9824f162830583bbf7846fe252 < b862996e5105be1293da9cdc85da77b76021c3bd","Linux >= a90f37e3d7acfd9824f162830583bbf7846fe252 < 2f8ed71aaaba3bc8b19cd9930cc62e63e142b299","Linux >= a90f37e3d7acfd9824f162830583bbf7846fe252 < eac6917a42899aad0617bbf04798c5dd946a1fe5","Linux >= a90f37e3d7acfd9824f162830583bbf7846fe252 < b09d092eb24ad0110f16a9b7c1ed5d2a0c1733dc","Linux >= 6.6.32 < 6.6.158","Linux >= 6.6.32 < 6.12.112","Linux >= 6.6.32 < 6.18.54","Linux >= 6.6.32 < 7.2.8","Linux >= 6.6.32 < 7.3-rc4"],"cvss":7,"cvssVector":"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H","cvssSource":"vendor","cwe":["CWE-125","CWE-20"],"epss":0.00478,"epssPercentile":0.41056,"scores":{"vendor":7.1,"cna":8.1},"slug":"CVE-2026-98405","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\nsmb: client: fix missing iov bounds check in parse_posix_sids()\n\nIn parse_posix_sids(), sidsbuf_end is calculated using the server-supplied\nout_len without being validated against the actual length of the received\niov (iov_len).\n\nIf a server provides an inflated out_len, sidsbuf_end will point past the\nend of the iov. This defeats the bounds guards in posix_info_sid_size(),\nallowing out-of-bounds reads into adjacent kernel memory.\n\nFix this by rejecting responses where the calculated sidsbuf_end would\nexceed the received iov boundaries or cause pointer wraparound.\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 8, Red Hat Enterprise Linux 9, Red Hat OpenShift Container Platform 4 · no fix planned: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 9, Red Hat OpenShift Container Platform 4 · updated 2026-10-24 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-98405.json)","depth":"twilight","depthScore":39,"depthScoreParts":{"impact":38.5,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[{"seq":222944,"id":"CVE-2026-98405","ts":1792151736101,"field":"cvss","old":null,"new":"7"},{"seq":222943,"id":"CVE-2026-98405","ts":1792151736101,"field":"severity","old":"none","new":"high"}]}