{"cve":"CVE-2026-23056","nvd":{"published":"2026-02-04T17:16:16.273","modified":"2026-06-17T10:20:47.030","status":"Deferred","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nuacce: implement mremap in uacce_vm_ops to return -EPERM\n\nThe current uacce_vm_ops does not support the mremap operation of\nvm_operations_struct. Implement .mremap to return -EPERM to remind\nusers.\n\nThe reason we need to explicitly disable mremap is that when the\ndriver does not implement .mremap, it uses the default mremap\nmethod. This could lead to a risk scenario:\n\nAn application might first mmap address p1, then mremap to p2,\nfollowed by munmap(p1), and finally munmap(p2). Since the default\nmremap copies the original vma's vm_private_data (i.e., q) to the\nnew vma, both munmap operations would trigger vma_close, causing\nq->qfr to be freed twice(qfr will be set to null here, so repeated\nrelease is ok).","cvss_v4":null,"cvss_v3":null,"cwes":[],"references":["https://git.kernel.org/stable/c/02695347be532b628f22488300d40c4eba48b9b7","https://git.kernel.org/stable/c/4c042bc71474dbe417c268f4bfb8ec196f802f07","https://git.kernel.org/stable/c/75b29bdc935ff93b8e8bf6f6b4d8a4810b26e06f","https://git.kernel.org/stable/c/78d99f062d42e3af2ca46bde1a8e46e0dfd372e3","https://git.kernel.org/stable/c/a407ddd61b3e6afc5ccfcd1478797171cf5686ee"],"products":[],"source":"nvd","synced_at":"2026-10-19T22:22:27.261130201+00:00"},"epss":{"cve":"CVE-2026-23056","score":0.00212,"percentile":0.11478,"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."]}