{"cve":"CVE-2026-45952","nvd":{"published":"2026-05-27T14:17:11.713","modified":"2026-06-17T10:52:47.133","status":"Analyzed","description":"In the Linux kernel, the following vulnerability has been resolved:\n\neth: fbnic: Add validation for MTU changes\n\nIncreasing the MTU beyond the HDS threshold causes the hardware to\nfragment packets across multiple buffers. If a single-buffer XDP program\nis attached, the driver will drop all multi-frag frames. While we can't\nprevent a remote sender from sending non-TCP packets larger than the MTU,\nthis will prevent users from inadvertently breaking new TCP streams.\n\nTraditionally, drivers supported XDP with MTU less than 4Kb\n(packet per page). Fbnic currently prevents attaching XDP when MTU is too high.\nBut it does not prevent increasing MTU after XDP is attached.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","score":5.5},"cwes":[],"references":["https://git.kernel.org/stable/c/03399063aa0c67fd8bdfd69467ddb849bb3b97df","https://git.kernel.org/stable/c/ccd8e87748ad083047d6c8544c5809b7f96cc8df","https://git.kernel.org/stable/c/d7eaa006c0444a5d4671be7efe6dbb33ef8b515e"],"products":["linux:linux_kernel"],"source":"nvd","synced_at":"2026-10-19T22:36:28.938604137+00:00"},"epss":{"cve":"CVE-2026-45952","score":0.00126,"percentile":0.02285,"date":"2026-10-31"},"kev":null,"osv":[],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}