{"id":"CVE-2026-97421","title":"In the Linux kernel, the following vulnerability has been resolved:\n\nRDMA/umem: Be careful about boundary conditions in ib_umem_find_best_pgsz()\n\nSeveral corner cases, especially important on 32 bits:\n\n- umem->iova is u64, the function a…","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\nRDMA/umem: Be careful about boundary conditions in ib_umem_find_best_pgsz()\n\nSeveral corner cases, especially important on 32 bits:\n\n- umem->iova is u64, the function a…","severity":"high","cvss":7.8,"cvssVector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","vendor":"Linux","product":"Linux","affected":["Linux >= a40c20dabdf9045270767c75918feb67f0727c89 < 3014da7587ce006cd08004fd6b257626b314e0a3","Linux >= a40c20dabdf9045270767c75918feb67f0727c89 < ddccf6cc3861de2fe60986933bead79220e0d797","Linux >= a40c20dabdf9045270767c75918feb67f0727c89 < e9bbb5f5349ef560ff6f0395564f04c3aa664559","Linux >= a40c20dabdf9045270767c75918feb67f0727c89 < ae3cf7d2c4d506c5c91746321644e1a08d989e2a","Linux >= a40c20dabdf9045270767c75918feb67f0727c89 < 5fc5b73109540809b094710fac44da81dd8a3ff8","Linux >= a40c20dabdf9045270767c75918feb67f0727c89 < 09ea6837a0434fb4db99528a5055b6d822135dcf","Linux 85e40ba1c4a5246b35e91c2ed69d4680426904d7","Linux 59f07434b297e2268f5d5c567db5b09145245cf1","Linux 488229b7729d7becf4c39c5e74fb709fb35115c2","Linux >= 5.4.73 < 5.5","Linux >= 5.8.17 < 5.9","Linux >= 5.9.2 < 5.10","Linux 5.10"],"published":"2026-09-24","updated":"2026-10-03","sourceUpdated":"2026-10-03T11:17:54.257","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-97421","references":[{"url":"https://git.kernel.org/stable/c/09ea6837a0434fb4db99528a5055b6d822135dcf","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/3014da7587ce006cd08004fd6b257626b314e0a3","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/5fc5b73109540809b094710fac44da81dd8a3ff8","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/ae3cf7d2c4d506c5c91746321644e1a08d989e2a","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/ddccf6cc3861de2fe60986933bead79220e0d797","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/e9bbb5f5349ef560ff6f0395564f04c3aa664559","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-97421.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-97421"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2540452"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-97421"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-97421"},{"url":"https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-97421.mbox"}],"tags":["nvd","cve.org","csaf","vex","red-hat","score-dispute"],"epss":0.00129,"epssPercentile":0.02537,"ingestedAt":"2026-09-24T16:47:15.884Z","cwe":["CWE-681"],"scores":{"nvd":7.8,"vendor":5.5},"slug":"CVE-2026-97421","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\nRDMA/umem: Be careful about boundary conditions in ib_umem_find_best_pgsz()\n\nSeveral corner cases, especially important on 32 bits:\n\n- umem->iova is u64, the function argument should pass in u64 or\n  iova will be truncated\n- Check that the length is not too large for the iova\n- Check that lengths > 4G don't overflow the GENMASK\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 2026-10-17 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-97421.json)","depth":"twilight","depthScore":43,"depthScoreParts":{"impact":42.9,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[{"seq":210581,"id":"CVE-2026-97421","ts":1790316054933,"field":"cvss","old":null,"new":"7.8"},{"seq":210580,"id":"CVE-2026-97421","ts":1790316054933,"field":"severity","old":"none","new":"high"}]}