CVE-2026-23056
In the Linux kernel, the following vulnerability has been resolved: uacce: implement mremap in uacce_vm_ops to return -EPERM The current uacce_vm_ops does not support the mremap operation of vm_operations_struct. Implement .mremap to return -EPERM to remind users. The reason we need to explicitly disable mremap is that when the driver does not implement .mremap, it uses the default mremap method. This could lead to a risk scenario: An application might first mmap address p1, then mremap to p2, followed by munmap(p1), and finally munmap(p2). Since the default mremap copies the original vma's vm_private_data (i.e., q) to the new vma, both munmap operations would trigger vma_close, causing q->qfr to be freed twice(qfr will be set to null here, so repeated release is ok).
Affected versions
Linux kernel versions
5.7
and later are affected. Fixed in
5.10.249,
5.15.199,
6.1.162,
6.6.122,
6.12.68,
6.18.8,
6.19
and their respective stable series.
References
The following references provide additional information about CVE-2026-23056 including vendor advisories, patch commits, exploit details, and third-party analysis. Links are sourced from the NIST NVD database.
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PatchKernel patch commithttps://git.kernel.org/stable/c/02695347be532b628f22488300d40c4eba48b9b7
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PatchKernel patch commithttps://git.kernel.org/stable/c/4c042bc71474dbe417c268f4bfb8ec196f802f07
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PatchKernel patch commithttps://git.kernel.org/stable/c/75b29bdc935ff93b8e8bf6f6b4d8a4810b26e06f
Frequently asked questions
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What is CVE-2026-23056?
CVE-2026-23056 is a unscored severity Linux kernel vulnerability . It affects Linux kernel versions from 5.7 onward and has been patched in 5.10.249, 5.15.199, 6.1.162 and others. CVE-2026-23056 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.
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Is there a patch available for CVE-2026-23056?
Yes — CVE-2026-23056 has been patched. Fixed versions include 5.10.249, 5.15.199, 6.1.162 and others. If you are running Linux kernel 5.7 or later up to the fix versions, apply the relevant patch for your kernel branch.
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Is CVE-2026-23056 actively exploited?
No — CVE-2026-23056 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.